US3797015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and system for locating a position
Assignee: Individual
•
Filing: 1971-10-04
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Granted: 1974-03-12
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Expires: 1991-10-04
Abstract
Abstract A method of and system for locating a position in which a plurality of frequency standard devices based on the action of the natural frequencies associated with transitions between energy states in atoms and/or molecules are synchronized or phase compared at the same initial location. Two of three frequency standard devices, in a two-dimensional embodiment, are placed at transmitting stations on a known baseline. The third device is at a third station, a receiving station, which receives signals from the two transmitting stations. At each transmitting station, means are provided for producing and transmitting a radio frequency carrier signal of fixed frequency and of fixed phase under the control of the frequency standard device associated with the respective station. The radio frequency carrier signals produced at the different transmitting stations differ in frequency. The radio frequency carrier signal produced at each transmitting station is modulated with a modulating signal produced under the control of the same frequency standard device which controls the means which produce the radio frequency carrier. At the receiving station, means are provided for producing a reference signal corresponding to the modulating signal and two radio frequency signals corresponding, in frequency, to the radio frequency carrier signals transmitted, the means at the receiving station being controlled by the frequency standard device associated with the receiving station. The reference signal is compared at the receiving station with the modulating signals recovered from the radio frequency carriers to determine respective time differences, the differences representing coarse position data from which the total number of phase rotations (full lanes) the receiving station is from each of the transmitting stations are determined. The phase relationships between each of the received radio frequency carrier signals and the respective one of the two radio frequency signals produced at the receiving station are determined, the relationships representing fine position data which are measurements of the receiving station position within a given phase rotation (lane). Methods and systems for locating a position in three dimensions are also described. The fine ranges, distances within given lanes, are respectively added by a computer to respective coarse ranges, each of which represents the total number of lanes to the full lane closest to respective ones of the transmitting stations, the totals being the distances between the receiving station and each of the transmitting stations.
Inventors
- 👤 A Elwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:15
CPC Classifications
G; G01; G01S; G01S5/00; G01S5/02; G01S5/14; G01S11/00; G01S11/02; G01S11/08
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
310 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically notch modulating said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically notch modulating said second radio signal with a second time signal, means controlled by said third source for generating a signal having a frequency identical to that of said first radio signal and a signal having a frequency identical to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, first phase comparing means at said third point for comparing the phase of the received first radio signal with that of said signal having a frequency identical to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the received second radio signal with that of said signal having a frequency identical to that of said second radio signal, means at said third point for demodulating said first and said second radio signals to recover said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 2
Dependent Claim
310 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically notch modulating said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically notch modulating said second radio signal with a second time signal, means controlled by said third source for generating a signal having a frequency identical to that of said first radio signal and a signal having a frequency identical to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, first phase comparing means at said third point for comparing the phase of the received first radio signal with that of said signal having a frequency identical to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the received second radio signal with that of said signal having a frequency identical to that of said second radio signal, means at said third point for demodulating said first and said second radio signals to recover said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 3
Dependent Claim
27 words
A position locating system according to claim 1 wherein said first source, said second source and said third source are respectively first, second and third atomic clocks.
Claim 4
Dependent Claim
66 words
A position locating system as claimed in claim 1 including computer means for receiving output signals from said first phase comparing means, said second phase comparing means and said means for comparing respectively said first time signal and said second time signal with said time reference signals for providing output signal data representative of the distance the third point is from the first and second points.
Claim 5
Dependent Claim
24 words
A position locating system as claimed in claim 3 including means controlled by said computer means for storing and displaying said output signal data.
Claim 6
Dependent Claim
41 words
A position locating system according to claim 1 wherein said means at said third point for demodulating said first and said second radio signals are means for detecting notch modulation to recover said first time signal and said second time signal.
Claim 7
Dependent Claim
161 words
A position locating system according to claim 1 comprising a fourth source of signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said fourth source for transmitting a third radio signal from a fourth point including third modulating means controlled by said fourth source for periodically notch modulating said third radio signal with a third time signal, means for receiving said third radio signal at said third point, means controlled by said third source for generating a signal having a frequency identical to that of said third radio signal, third phase comparing means at said third point for comparing the phase of the received third radio signal with that of said signal having a frequency identical to that of said third radio signal, means at said third point for demodulating said third radio signal to recover said third time signal, and means for comparing said third time signal with said time reference signals.
Claim 8
Dependent Claim
34 words
A position locating system according to claim 6 wherein said means at said third point for demodulating said third radio signal is a means for detecting notch modulation to recover said third time signal.
Claim 9
Dependent Claim
83 words
A position locating system according to claim 6 including computer means for receiving output signals from said first phase comparing means, said second phase comparing means, said third phase comparing means, said means for comparing respectively said first time signal and said second time signal with said time reference signals and said means for comparing said third time signal with said time reference signals for providing output signal data representative of distance said third point is from the first, second and fourth points.
Claim 10
Dependent Claim
24 words
A position locating system as claimed in claim 8 including means controlled by said computer means for storing and displaying said output signal data.
Claim 11
Dependent Claim
262 words
A position locating method comprising providing a first signal of given frequency and given phase, providing a second signal of said given frequency and a predetermined phase relationship with said given phase, providing a third signal of said given frequency and a predetermined phase relationship with said given phase, periodically notch modulating a first radio signal related to said first signal with a first time signal also related to said first signal, transmitting the first radio signal from a first point, periodically notch modulating a second radio signal related to said second signal with a second time signal also related to said second signal, transmitting the second radio signal from a second point, generating a signal having a frequency identical to that of said first radio signal and a signal having a frequency identical to that of said second radio signal at a third point, generating time reference signals related to the third signal at the third point, receiving said first radio signal and said second radio signal at said third point, demodulating said first radio signal and said sEcond radio signal to recover said first time signal and said second time signal, comparing the phase of the received first radio signal with that of said signal having a frequency identical to that of said first radio signal, comparing the phase of the received second radio signal with that of said signal having a frequency identical to that of said second radio signal, and comparing respectively the recovered first time signal and the recovered second time signal with said time reference signals.
Claim 12
Dependent Claim
262 words
A position locating method comprising providing a first signal of given frequency and given phase, providing a second signal of said given frequency and a predetermined phase relationship with said given phase, providing a third signal of said given frequency and a predetermined phase relationship with said given phase, periodically notch modulating a first radio signal related to said first signal with a first time signal also related to said first signal, transmitting the first radio signal from a first point, periodically notch modulating a second radio signal related to said second signal with a second time signal also related to said second signal, transmitting the second radio signal from a second point, generating a signal having a frequency identical to that of said first radio signal and a signal having a frequency identical to that of said second radio signal at a third point, generating time reference signals related to the third signal at the third point, receiving said first radio signal and said second radio signal at said third point, demodulating said first radio signal and said sEcond radio signal to recover said first time signal and said second time signal, comparing the phase of the received first radio signal with that of said signal having a frequency identical to that of said first radio signal, comparing the phase of the received second radio signal with that of said signal having a frequency identical to that of said second radio signal, and comparing respectively the recovered first time signal and the recovered second time signal with said time reference signals.
Claim 13
Dependent Claim
29 words
A position locating method according to claim 10 wherein said first signal, said second signal and said third signal are respectively provided from first, second and third atomic clocks.
Claim 14
Dependent Claim
134 words
The position locating method according to claim 10 including providing a fourth signal of the given frequency and a predetermined phase relationship with said given phase, periodically notch modulating a third radio signal related to said fourth signal with a third time signal also related to said fourth signal, transmitting the third radio signal from a fourth point, receiving said third radio signal at said third point, generating a signal having a frequency identical to that of said third radio signal at said third point, demodulating the received third radio signal to recover said third time signal, comparing the phase of the received third radio signal with that of said signal having a frequency identical to that of said third radio signal, and comparing the recovered third time signal with said time reference signals.
Claim 15
Dependent Claim
35 words
The position locating method according to claim 12 wherein the step of demodulating said third radio signal is the step of demodulating the received notch modulated third radio signal to recover said third time signal.
Claim 16
Dependent Claim
183 words
A position locating system comprising a plurality of sources of signals of given frequency and predetermined phase relationships, means controlled respectively by each of said plurality of sources for transmitting from respective points respective signals including modulating means controlled respectively by each of said plurality of sources for notch modulating said respective signals with respective time signals, means controlled by a source of signal having the same given frequency as said plurality of sources of signals and having a predetermined phase relationship for generating signals corresponding to said respective signals at an additional point, means controlled by said source of signal at said additional point for producing time reference signals, means for receiving said respective signals at said additional point, phase comparing means at said additional point for comparing respectively the phase of each of said respective signals as received with the phase of the signals corresponding to said respective signals, means at said additional point for demodulating said respective signals as received to recover said respective time signals, and means for comparing the recovered respective time signals with said time reference signals.
Claim 17
Dependent Claim
183 words
A position locating system comprising a plurality of sources of signals of given frequency and predetermined phase relationships, means controlled respectively by each of said plurality of sources for transmitting from respective points respective signals including modulating means controlled respectively by each of said plurality of sources for notch modulating said respective signals with respective time signals, means controlled by a source of signal having the same given frequency as said plurality of sources of signals and having a predetermined phase relationship for generating signals corresponding to said respective signals at an additional point, means controlled by said source of signal at said additional point for producing time reference signals, means for receiving said respective signals at said additional point, phase comparing means at said additional point for comparing respectively the phase of each of said respective signals as received with the phase of the signals corresponding to said respective signals, means at said additional point for demodulating said respective signals as received to recover said respective time signals, and means for comparing the recovered respective time signals with said time reference signals.
Claim 18
Dependent Claim
27 words
A position locating system according to claim 14 wherein said plurality of sources of signals are two sources of signals and the respective points are two points.
Claim 19
Dependent Claim
27 words
A position locating system according to claim 14 wherein said plurality of sources of signals are three sources of signals and the respective points are three points.
Claim 20
Dependent Claim
24 words
A position locating system according to claim 16 wherein at least one of said plurality of sources of signals is carried by a satellite.
Claim 21
Dependent Claim
22 words
A position locating system according to claim 16 wherein said source of signal at said additional point is carried by an aircraft.
Claim 22
Dependent Claim
27 words
A position locating system according to claim 15 wherein said source of signal at said additional point is carried by an aircraft, said aircraft having an altimeter.
Claim 23
Dependent Claim
173 words
A position locating method comprising providing a first plurality of signals of given frequency and predetermined phase relationships, deriving a second plurality of signals from said first plurality of signals, notch modulating said second plurality of signals with time signals derived respectively from said first plurality of signals, transmitting from respective points said second plurality of signals, receiving at an additional point said second plurality of signals, providing a source of signal at said additional point having the same frequency as said given frequency and having a predetermined phase relationship, generating signals corresponding to said second plurality of signals under the control of the source of signal at said additional point, generating reference time signals under control of said source of signal at said additional point, comparing the phase of each of the received second plurality of signals with the phase of the signals corresponding to said second plurality of signals, demodulating said second plurality of signals to derive said time signals, and comparing the derived time signals with the reference time signals.
Claim 24
Dependent Claim
173 words
A position locating method comprising providing a first plurality of signals of given frequency and predetermined phase relationships, deriving a second plurality of signals from said first plurality of signals, notch modulating said second plurality of signals with time signals derived respectively from said first plurality of signals, transmitting from respective points said second plurality of signals, receiving at an additional point said second plurality of signals, providing a source of signal at said additional point having the same frequency as said given frequency and having a predetermined phase relationship, generating signals corresponding to said second plurality of signals under the control of the source of signal at said additional point, generating reference time signals under control of said source of signal at said additional point, comparing the phase of each of the received second plurality of signals with the phase of the signals corresponding to said second plurality of signals, demodulating said second plurality of signals to derive said time signals, and comparing the derived time signals with the reference time signals.
Claim 25
Dependent Claim
314 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically pulse modulating by pulsing said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically pulse modulating by pulsing said second radio signal with a second time signal, means controlled by said third source for generating a signal having a frequency identical to that of said first radio signal and a signal having a frequency identical to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, first phase comparing means at said third point for comparing the phase of the received first radio signal with that of said signal having a frequency identical to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the received second radio signal with that of said signal having a frequency identical to that of said second radio signal, means at said third point for demodulating said first and said second radio signals to recover said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 26
Dependent Claim
314 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically pulse modulating by pulsing said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically pulse modulating by pulsing said second radio signal with a second time signal, means controlled by said third source for generating a signal having a frequency identical to that of said first radio signal and a signal having a frequency identical to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, first phase comparing means at said third point for comparing the phase of the received first radio signal with that of said signal having a frequency identical to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the received second radio signal with that of said signal having a frequency identical to that of said second radio signal, means at said third point for demodulating said first and said second radio signals to recover said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 27
Dependent Claim
27 words
A position locating system according to claim 21 wherein said first source, said second source and said third source are respectively first, second and third atomic clocks.
Claim 28
Dependent Claim
310 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically frequency modulating said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically frequency modulating said second radio signal with a second time signal, means controlled by said third source for generating a signal having a frequency identical to that of said first radio signal and a signal havinG a frequency identical to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, first phase comparing means at said third point for comparing the phase of the received first radio signal with that of said signal having a frequency identical to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the received second radio signal with that of said signal having a frequency identical to that of said second radio signal, means at said third point for demodulating said first and said second radio signals to recover said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 29
Dependent Claim
310 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically frequency modulating said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically frequency modulating said second radio signal with a second time signal, means controlled by said third source for generating a signal having a frequency identical to that of said first radio signal and a signal havinG a frequency identical to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, first phase comparing means at said third point for comparing the phase of the received first radio signal with that of said signal having a frequency identical to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the received second radio signal with that of said signal having a frequency identical to that of said second radio signal, means at said third point for demodulating said first and said second radio signals to recover said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 30
Dependent Claim
27 words
A position locating system according to claim 23 wherein said first source, said second source and said third source are respectively first, second and third atomic clocks.
Claim 31
Dependent Claim
312 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically frequency shift modulating said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically frequency shift modulating said second radio signal with a second time signal, means controlled by said third source for generating a signal having a frequency identical to that of said first radio signal and a signal having a frequency identical to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, first phase comparing means at said third point for comparing the phase of the received first radio signal with that of said signal having a frequency identical to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the received second radio signal with that of said signal having a frequency identical to that of said second radio signal, means at said third point for demodulating said first and said second radio signals to recover said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 32
Dependent Claim
312 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically frequency shift modulating said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically frequency shift modulating said second radio signal with a second time signal, means controlled by said third source for generating a signal having a frequency identical to that of said first radio signal and a signal having a frequency identical to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, first phase comparing means at said third point for comparing the phase of the received first radio signal with that of said signal having a frequency identical to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the received second radio signal with that of said signal having a frequency identical to that of said second radio signal, means at said third point for demodulating said first and said second radio signals to recover said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 33
Dependent Claim
27 words
A position locating system according to claim 25 wherein said first source, said second source and said third source are respectively first, second and third atomic clocks.
Claim 34
Dependent Claim
340 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically pulse modulating by pulsing said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically pulse modulating by pulsing said second radio signal with a second time signAl, means controlled by said third source for generating a signal having a given frequency related to that of said first radio signal and a signal having a given frequency related to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, mixer means coupled to said means for receiving and responsive to said first radio signal and to said second radio signal for producing a first intermediate signal and a second intermediate signal, first phase comparing means at said third point for comparing the phase of the first intermediate signal with that of said signal having a given frequency related to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the second intermediate signal with that of said signal having a given frequency related to that of said second radio signal, demodulating means at said third point for recovering said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 35
Dependent Claim
340 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically pulse modulating by pulsing said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically pulse modulating by pulsing said second radio signal with a second time signAl, means controlled by said third source for generating a signal having a given frequency related to that of said first radio signal and a signal having a given frequency related to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, mixer means coupled to said means for receiving and responsive to said first radio signal and to said second radio signal for producing a first intermediate signal and a second intermediate signal, first phase comparing means at said third point for comparing the phase of the first intermediate signal with that of said signal having a given frequency related to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the second intermediate signal with that of said signal having a given frequency related to that of said second radio signal, demodulating means at said third point for recovering said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 36
Dependent Claim
27 words
A position locating system according to claim 27 wherein said first source, said second source and said third source are respectively first, second and third atomic clocks.
Claim 37
Dependent Claim
336 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically notch modulating said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically notch modulating said second radio signal with a second time signal, means controlled by said third source for generating a signal having a given frequency related to that of said first radio signal and a signal having a given frequency related to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, mixer means coupled to said means for receiving and responsive to said first radio signal and to said second radio signal for producing a first intermediate signal and a second intermediate signal, first phase comparing means at said third point for comparing the phase of the first intermediate signal with that of said signal having a given frequency related to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the second intermediate signal with that of said signal having a given frequency related to that of said second radio signal, demodulating means at said third point for recovering said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 38
Dependent Claim
336 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically notch modulating said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically notch modulating said second radio signal with a second time signal, means controlled by said third source for generating a signal having a given frequency related to that of said first radio signal and a signal having a given frequency related to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, mixer means coupled to said means for receiving and responsive to said first radio signal and to said second radio signal for producing a first intermediate signal and a second intermediate signal, first phase comparing means at said third point for comparing the phase of the first intermediate signal with that of said signal having a given frequency related to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the second intermediate signal with that of said signal having a given frequency related to that of said second radio signal, demodulating means at said third point for recovering said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 39
Dependent Claim
27 words
A position locating system according to claim 29 wherein said first source, said second source and said third source are respectively first, second and third atomic clocks.
Claim 40
Dependent Claim
336 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source foR transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically frequency modulating said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically frequency modulating said second radio signal with a second time signal, means controlled by said third source for generating a signal having a given frequency related to that of said first radio signal and a signal having a given frequency related to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, mixer means coupled to said means for receiving and responsive to said first radio signal and to said second radio signal for producing a first intermediate signal and a second intermediate signal, first phase comparing means at said third point for comparing the phase of the first intermediate signal with that of said signal having a given frequency related to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the second intermediate signal with that of said signal having a given frequency related to that of said second radio signal, demodulating means at said third point for recovering said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 41
Dependent Claim
336 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source foR transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically frequency modulating said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically frequency modulating said second radio signal with a second time signal, means controlled by said third source for generating a signal having a given frequency related to that of said first radio signal and a signal having a given frequency related to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, mixer means coupled to said means for receiving and responsive to said first radio signal and to said second radio signal for producing a first intermediate signal and a second intermediate signal, first phase comparing means at said third point for comparing the phase of the first intermediate signal with that of said signal having a given frequency related to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the second intermediate signal with that of said signal having a given frequency related to that of said second radio signal, demodulating means at said third point for recovering said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 42
Dependent Claim
27 words
A position locating system according to claim 31 wherein said first source, said second source and said third source are respectively first, second and third atomic clocks.
Claim 43
Dependent Claim
338 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically frequency shift modulating said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically frequency shift modulating said second radio signal with a second time signal, means controlled by said third source for generating a signal having a given frequency related to that of said first radio signal and a signal having a given frequency related to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, mixer means coupled to said means for receiving and responsive to said first radio signal and to said second radio signal for producing a first intermediate signal and a second intermediate signal, first phase comparing means at said third point for comparing the phase of the first intermediate signal with that of said signal having a given frequency related to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the second intermediate signal with that of said signal having a given frequency related to that of said second radio signal, demodulating means at said third point for recovering said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 44
Dependent Claim
338 words
A position locating system comprising a first source of a signal of given frequency and given phase, a second source of a signal of said given frequency and a predetermined phase relationship with said given phase, a third source of a signal of said given frequency and a predetermined phase relationship with said given phase, means controlled by said first source for transmitting a first radio signal from a first point including first modulating means controlled by said first source for periodically frequency shift modulating said first radio signal with a first time signal, means controlled by said second source for transmitting a second radio signal from a second point including second modulating means controlled by said second source for periodically frequency shift modulating said second radio signal with a second time signal, means controlled by said third source for generating a signal having a given frequency related to that of said first radio signal and a signal having a given frequency related to that of said second radio signal at a third point, means controlled by said third source for periodically producing time reference signals, means for receiving said first radio signal and said second radio signal at said third point, mixer means coupled to said means for receiving and responsive to said first radio signal and to said second radio signal for producing a first intermediate signal and a second intermediate signal, first phase comparing means at said third point for comparing the phase of the first intermediate signal with that of said signal having a given frequency related to that of said first radio signal, second phase comparing means at said third point for comparing the phase of the second intermediate signal with that of said signal having a given frequency related to that of said second radio signal, demodulating means at said third point for recovering said first time signal and said second time signal, and means for comparing respectively said first time signal and said second time signal with said time reference signals.
Claim 45
Dependent Claim
27 words
A position locating system according to claim 33 wherein said first sOurce, said second source and said third source are respectively first, second and third atomic clocks.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |