Patent US2692728A successfully refreshed from Google Patents.
Patent EP0186198A2 successfully refreshed from Google Patents.
EP0186198A2
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EP
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System and method for deriving the position of a receiver from signals broadcast by satellites.
Assignee: Sony Corp
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Filing: 1985-12-24
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Granted: —
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Expires: 2005-12-24
Abstract
Abstract A GPS receiver (10) comprises a phase-error derivation circuit (161 which derives the average phase-error over a predetermined period. The phase-error derivation circuit sends an average phase difference signal to a numerically controlled oscillator (18) to control its clqck rate. Deriving the average phase error over the predetermined period makes it possible to derive the phase error between the Gold code sequence from the satellite and the Gold code sequence derived by the local Gold code generator precisely.
Inventors
- 👤 Katsuya C/O Sony Corporation Hori
- 👤 Masahiro C/O Sony Corporation Fujita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 20:07
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/01; G01S19/13; G01S19/35; G01S19/37; G01S19/23; G01S19/235; G01S19/24; G01S19/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
246 words
A receiver system (10) for deriving the position of a receiver station from spread spectrum signals broadcast by satellites, comprising: means for receiving said spread spectrum signals (SIN) and a repeating pulse epoch having the same frequency with the spread spectrum signals; means (20), installed in said receiver system (10), for generating a signal essentially matching said spread spectrum signal from said satellite and containing pulse epochs at intervals essentially matching those of said signal from said satellite; means (12) for correlating said spread spectrum signals (S1N) from said satellite with said internally generated signal and producing a correlation signal (S1) when correlation therebetween is established; means, responsive to said correlation signal from said correlating means (12), for deriving the average phase error between said spread spectrum signals (S IN ) from said satellite and said internally generated signals over predetermined periods of times, and producing an average phase-error signal; means (16), responsive to said average phase error signal, for controlling said internal spread spectrum signal generating means to adjust the phase of said internally generated spread spectrum signal so as to reduce said phase error; and means (24) for deriving a basic propagation time value of said spread spectrum signal from said satellite relative to said internally generated spread spectrum signal and thereby deriving the distance of said satellite from said receiver station and for correcting said basic propagation time value based on said average phase error signal value to derive a correct propagation time.
Claim 2
Dependent Claim
246 words
A receiver system (10) for deriving the position of a receiver station from spread spectrum signals broadcast by satellites, comprising: means for receiving said spread spectrum signals (SIN) and a repeating pulse epoch having the same frequency with the spread spectrum signals; means (20), installed in said receiver system (10), for generating a signal essentially matching said spread spectrum signal from said satellite and containing pulse epochs at intervals essentially matching those of said signal from said satellite; means (12) for correlating said spread spectrum signals (S1N) from said satellite with said internally generated signal and producing a correlation signal (S1) when correlation therebetween is established; means, responsive to said correlation signal from said correlating means (12), for deriving the average phase error between said spread spectrum signals (S IN ) from said satellite and said internally generated signals over predetermined periods of times, and producing an average phase-error signal; means (16), responsive to said average phase error signal, for controlling said internal spread spectrum signal generating means to adjust the phase of said internally generated spread spectrum signal so as to reduce said phase error; and means (24) for deriving a basic propagation time value of said spread spectrum signal from said satellite relative to said internally generated spread spectrum signal and thereby deriving the distance of said satellite from said receiver station and for correcting said basic propagation time value based on said average phase error signal value to derive a correct propagation time.
Claim 3
Dependent Claim
25 words
The receiver system as set forth in claim 1, wherein said means for controlling said internal spread spectrum signal generating means comprises a digital circuit.
Claim 4
Dependent Claim
21 words
The receiver syetem as set forth in claim 2, wherein said means for deriving said average phase-error comprises a digital circuit.
Claim 5
Dependent Claim
28 words
4 . The receiver system as set forth in claim 3, wherein said means for controlling said internal spread spectrum signal generating means comprises a numerically controlled oscillator.
Claim 6
Dependent Claim
25 words
The receiver system as set forth in claim 4, wherein said predetermined period of time match the epoch intervals of said spread spectrum signaLs. -
Claim 7
Dependent Claim
50 words
The receiver system as set forth in claim 5, which further comprises a clock generator(18)and said means for controlling said internal spread spectrum signal generating means controls the pulse frequency of a clock signal generated by said clock generator for controlling the phase of said internally generated spread spectrum signal.
Claim 8
Dependent Claim
222 words
A process for deriving the position of a receiver station (10) from a spread spectrum signal transmitted by a satellite, comprising the steps of: receiving said spread spectrum sionals(S IN ) and a repeating pulse epoch having the same frequency with the spread spectrum signal; generating a signal essentially matching said spread spectrum signal from said satellite and containing pulse epochs at intervals essentially matching those of said signal from said satellite; comparing said spread spectrum signals (S IN) from said satellite with said internally generated signal (S PN ) and producing a correlation signal (S 1 ) when correlation therebetween is established; deriving the average phase error between said a spread spectrum signals from said satellite and said internally generated signals over predetermined periods of times in response to said correlation signal, and producing an average phase-error signal; adjusting the phase of said internally generated spread spectrum . signal so as to reduce said phase error on the basis of said phase-error signal; and deriving a basic propagation time value of said spread spectrum signal from said satellite relative to said internally generated spread spectrum signal and thereby deriving the distance of said satellite from said receiver station (10) and for correcting said basic propagation time value based on said average phase error signal value to derive a correct propagation time.
Claim 9
Dependent Claim
222 words
A process for deriving the position of a receiver station (10) from a spread spectrum signal transmitted by a satellite, comprising the steps of: receiving said spread spectrum sionals(S IN ) and a repeating pulse epoch having the same frequency with the spread spectrum signal; generating a signal essentially matching said spread spectrum signal from said satellite and containing pulse epochs at intervals essentially matching those of said signal from said satellite; comparing said spread spectrum signals (S IN) from said satellite with said internally generated signal (S PN ) and producing a correlation signal (S 1 ) when correlation therebetween is established; deriving the average phase error between said a spread spectrum signals from said satellite and said internally generated signals over predetermined periods of times in response to said correlation signal, and producing an average phase-error signal; adjusting the phase of said internally generated spread spectrum . signal so as to reduce said phase error on the basis of said phase-error signal; and deriving a basic propagation time value of said spread spectrum signal from said satellite relative to said internally generated spread spectrum signal and thereby deriving the distance of said satellite from said receiver station (10) and for correcting said basic propagation time value based on said average phase error signal value to derive a correct propagation time.
Claim 10
Dependent Claim
29 words
The process as set forth in claim 7, wherein said step of controlling the phase of said internal spread spectrum signal is performed by means of a digital circuit.
Claim 11
Dependent Claim
22 words
The process. as set forth in claim 8, wherein said step of deriving said average phase-error is performed by a digital circuit.
Claim 12
Dependent Claim
28 words
The process as set forth in claim 9, wherein said step of controlling the phase of said internal spread spectrum signal is performed by a numerically controlled oscillator.
Claim 13
Dependent Claim
23 words
The process as set forth in claim 10, wherein said predetermined period of time match the epoch intervals of said spread spectrum signals.
References Cited (Backward Citations)
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