Patent US2265781A successfully refreshed from Google Patents.
Patent US3818477A successfully refreshed from Google Patents.
US3818477A
Expired / Lapsed
US
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Pulse-operated receiver
Assignee: Trane US Inc
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Filing: 1969-12-31
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Granted: 1974-06-18
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Expires: 1989-12-31
Abstract
Abstract Disclosed is a receiver for a navigation system of the Omega type which operates with pulse-modulated signals. The phase of received and local signals is compared by quantized pulses; phase equalization, commutating gate control, phase tracking, and synchronization of gate patterns with time-sequence input signals are obtained by pulse insertion into, or deletion from, signal loops which contain phase detecting, sequential signal selecting, and readout control components. Phase coincidence is counted cumulatively and is electromechanically stored. Lane position is recorded by pulse insertion. Components are constructed and interrelated to reduce noise and improve selectivity to enhance the benefits obtained by pulsed operation control.
Inventors
- 👤 C Odams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:58
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/30; G01S1/308
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
198 words
A navigation system for fixing the location of a vehicle, of the type wherein pairs of transmitters are employed to determine lanes of position defined by phase angle differences of signals from the transmitters, comprising: a plurality of synchronously operated signal transmitters producing sequentially transmitted, pulsed signals; first means for receiving said signals from said plurality of transmitters, including signal-pulse generator means for producing a local signal related to said sequentially transmitted signals; means associated with said first means for detecting consecutive sequences of said transmitted signals, respectively, and for separately comparing their respective phase angles with the phAse angle of said local signal; second means for matching the phase angle of said local signal with the phase angles of the respective transmitted signals during said sequences, said second means including means for converting phase angle differences between the transmitted signals received by the first means and said local signal into a number of discrete pulses generated during the presence of said phase angle differences and for indicating, from the number of said discrete pulses, the magnitude of the respective phase angle differences; and means for correlating said phase angle differences to indicate the position of said vehicle.
Claim 2
Dependent Claim
198 words
A navigation system for fixing the location of a vehicle, of the type wherein pairs of transmitters are employed to determine lanes of position defined by phase angle differences of signals from the transmitters, comprising: a plurality of synchronously operated signal transmitters producing sequentially transmitted, pulsed signals; first means for receiving said signals from said plurality of transmitters, including signal-pulse generator means for producing a local signal related to said sequentially transmitted signals; means associated with said first means for detecting consecutive sequences of said transmitted signals, respectively, and for separately comparing their respective phase angles with the phAse angle of said local signal; second means for matching the phase angle of said local signal with the phase angles of the respective transmitted signals during said sequences, said second means including means for converting phase angle differences between the transmitted signals received by the first means and said local signal into a number of discrete pulses generated during the presence of said phase angle differences and for indicating, from the number of said discrete pulses, the magnitude of the respective phase angle differences; and means for correlating said phase angle differences to indicate the position of said vehicle.
Claim 3
Dependent Claim
21 words
The system according to claim 1 wherein the transmitted signals and the locally produced local signal are digitally coded, pulsed signals.
Claim 4
Dependent Claim
18 words
The system according to claim 2 wherein said phase angle differences define time intervals between the respective signals.
Claim 5
Dependent Claim
34 words
The system according to claim 2 wherein said second means includes means for inserting and deleting the phase-difference-defining pulses into and from said local signal, respectively, depending on the sense of the phase difference.
Claim 6
Dependent Claim
36 words
The system according to claim 2 wherein said phase-difference-defining means generates pulses at a first point whenever phase difference is of one sense, and at a second point whenever phase difference is of the other sense.
Claim 7
Dependent Claim
38 words
The system according to claim 5 wherein said second means includes third means for inserting pulses at said first point into said local signal, and deleting means for deleting pulses at said second point from said local signal.
Claim 8
Dependent Claim
48 words
The system according to claim 6 wherein said third means includes an input for said phase-difference-defining pulses, and fourth means responsive thereto and to said local signal for interpolating between two successive pulses of said local signal and additional pulse for each phase-difference-defining pulse appearing at said output.
Claim 9
Dependent Claim
77 words
The system according to claim 7 wherein said fourth means includes a first monostable multivibrator placed in triggerable condition by a phase-difference-defining pulse and triggered by the first subsequent local signal pulse, the period of said first monostable multivibrator being less than the interval between successive local signal pulses, and a second monostable multivibrator triggered by said first monostable multivibrator to produce additional pulses, and means for combining said additional pulses with said local signal pulse train.
Claim 10
Dependent Claim
55 words
The system according to claim 6 wherein said deleting means includes an input for said phase-difference-defining pulses appearing at said second point and fifth means responsive to said phase-difference-defining pulses and to said local signal pulses for blocking one pulse from the local signal pulse train each time a phase-difference-defining pulse appears at said input.
Claim 11
Dependent Claim
50 words
The system according to claim 9 wherein said fifth means includes a monostable multivibrator placed into triggerable condition by a phase-difference-defining pulse and triggered by the first subsequent local signal pulse and a gate inhibited by said monostable multivibrator for a period sufficient to block a single local signal pulse.
Claim 12
Dependent Claim
33 words
The system according to claim 6 further comprising means for frequency dividing said local signal with insertions or deletions, to obtain a phase-adjusted comparison signal of the same frequency as said transmitted signal.
Claim 13
Dependent Claim
55 words
The system according to claim 11 wherein said second means further includes phase-detector means for comparing the phases of said transmitted signals and said comparison signal, said phase-difference-defining means being responsive to said phase-detector means, thereby to lock the phase of the comparison signal to the phase of the selected sequence of the transmitted signals.
Claim 14
Dependent Claim
86 words
The system according to claim 5 wherein said phase-difference-defining means comprises an input, a sawtooth-wave, signal generator which has its output frequency controlled by tHe magnitude of a control voltage at said input, and the polarity of the output sawtooth-wave controlled by the polarity of said control voltage, differentiator means for said output sawtooth-wave signal for producing pulses of corresponding frequency and polarity, and separating means for directing pulses of one polarity to said first location and pulses of the other polarity to the second location.
Claim 15
Dependent Claim
54 words
The system according to claim 13 wherein said separating means comprises a first amplifier biased to respond only to pulses of said one polarity and having its output at said first location, and a second amplifier biased to respond only to pulses of said other polarity and having its output at said second location.
Claim 16
Dependent Claim
53 words
The system according to claim 13 wherein said matching means comprises phase-detector means with an output voltage of magnitude corresponding to the magnitude of the phase difference and of a polarity corresponding to the sense of the phase difference, said phase-detector output voltage being applied to the input of said phase-difference defining means.
Claim 17
Dependent Claim
98 words
The system according to claim 1 wherein said local signal has a frequency which is an integral multiple of the frequency of the transmitted signals applied to said matching means, and wherein said matching means comprises means for inserting and deleting said phase-difference-defining pulses into and from said local signal, respectively, depending on the sense of the phase difference; and means for frequency dividing said local signal with insertions and deletions by said integral multiple, thereby to obtain a phase-adjusted signal at the transmitted signal frequency to compare therewith for phase difference, thereby providing a phase-adjusted comparison signal.
Claim 18
Dependent Claim
39 words
The system according to claim 16 wherein said second means further includes phase-detector means responsive to the phase difference between said phase-adjusted comparison signal and said transmitted signal, and wherein said phase-difference-defining means is responsive to said phase-detector means.
Claim 19
Dependent Claim
40 words
The system according to claim 1 wherein said means for detecting consecutive sequences of said transmitted impulses comprises a timing-function generator, and gate means for connecting said second means into phase-matching relationship in response to signals from said timing-function generator.
Claim 20
Dependent Claim
37 words
The system according to claim 18 wherein said timing-function generator produces gate-controlling signals from an input clock-pulse signal, and said selecting means further comprises means for synchronizing said gate-controlling signals with said consecutive sequences of transmitted signals.
Claim 21
Dependent Claim
42 words
The system according to claim 19 wherein said synchronizing means comprises a pulse generator and means for selectively inserting or deleting pulses therefrom into or from the clock-pulse signal operating the timing-function generator, thereby to advance or retard, respectively, the gate-controlling signal.
Claim 22
Dependent Claim
69 words
The system according to claim 20 wherein said means for selectively inserting or deleting pulses comprises a first input, means responsive to pulses at said first input for inserting pulses into the clock-pulse signal, a second input, means responsive to pulses at said second input for deleting pulses from said clock-pulse signal, and manual switch means for connecting said pulse generator to one of said first and second inputs.
Claim 23
Dependent Claim
37 words
The system according to claim 18 wherein said second means comprises a plurality of means for combining said phase-difference-defining pulses with said local signal, and wherein said gate means connect said combining means to said phase-difference-defining means.
Claim 24
Dependent Claim
75 words
The system according to claim 22 wherein said timing-function generator produces a pattern of gate-controlling signals from a clock pulse train, and wherein said selecting means comprises synchronizing means for advancing and retarding said pattern to cause said consecutive sequences of transmitted impulses to be contemporaneous with The connection of selected ones of said plurality of combining means, to said phase-difference-defining means, thereby to associate each sequence of transmitted signals with a single combining means.
Claim 25
Dependent Claim
44 words
The system according to claim 23 wherein said synchronizing means comprises a pulse generator, and means for selectively inserting or deleting pulses therefrom into or from the clock pulse train operating the time function generator, thereby to advance or retard, respectively, the gate-controlling signal.
Claim 26
Dependent Claim
51 words
The system according to claim 1 wherein said correlating means, for phase-difference-defining pulses generated for a pair of transmitting stations, comprises: means for counting the number of pulses generated, numerical display means, and means for changing the indication of said numerical display means in accordance with the number of pulses generated.
Claim 27
Dependent Claim
120 words
The system according to claim 25 wherein, for each transmitting station, said phase-difference-defining pulses are generated at a first location for one sense of phase difference and at a second location for the other sense of phase difference and wherein said counting means comprises a first partial sum means for counting together pulses appearing at the first station''s first location and the second station''s second location; a second partial sum means for counting together pulses appearing at the first station''s second location and the second station''s first location, and means for combining the counts of said first and second partial sum means to produce a number of pulses equal to the difference therebetween for application to the indication changing means.
Claim 28
Dependent Claim
36 words
The system according to claim 26 wherein each of said partial sum means comprises means for storing the accumulated count and means for periodically transferring the count, and resetting said storing means to an empty condition.
Claim 29
Dependent Claim
44 words
The system according to claim 27 wherein said count is periodically transferred to a register which is depleted by a clock pulse signal, and wherein gate means pass said clock pulse signal, between the times of transfer and full depletion, to said combining means.
Claim 30
Dependent Claim
92 words
The system according to claim 27 wherein said first and second partial sum means each periodically emit a number of countout pulses equal to their accumulated count, and wherein said combining means comprises first gate means for passing countout pulses from the first partial sum means and second gate means for passing countout pulses from the second partial sum means, said gates each being inhibited by countout pulses appearing at the opposite gate, thereby to block simultaneous countout pulses and to pass only countout pulses representing the difference between their respective numbers.
Claim 31
Dependent Claim
55 words
The system according to claim 29 wherein said numerical display means comprises an electromagnetic counter having a coil for increasing the count and a coil for decreasing the count, said coils being responsive respectively to countout pulses passed by said first and second gate means, whereby said combining means prevents said coils from responding simultaneously.
Claim 32
Dependent Claim
22 words
The system according to claim 1 wherein said correlating means includes chart recorder means for indicating the position of said first means.
Claim 33
Dependent Claim
100 words
The system according to claim 31 wherein said second means includes means for inserting and deleting said phase-difference-defining pulses into and from said local signal during said sequences, and independent means for dividing the generator pulses with insertions and deletions to produce for each sequence a comparison signal with a phase adjustment, and wherein said correlating means comprises phase-detector means for comparing a pair of said comparison signals and said chart recorder means is responsive to said phase-detector means for indicating the position of the first means with respect to the transmitters corresponding to a respective pair of comparison signals.
Claim 34
Dependent Claim
55 words
The system according to claim 1 wherein said first mEans includes an antenna and means for amplifying and filtering the antenna output characterized in that said amplifying and filtering means includes limiting means and said amplifying, filtering, and limiting functions are distributed successively in each of a plurality of stages, thereby to minimize phase shift.
Claim 35
Dependent Claim
33 words
The system according to claim 33 wherein said amplifying, filtering, and limiting means are correlated so that said transmitted signals are limited at an earlier stage than undesired signals outside the filter bandwidth.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |