Patent US4455680A successfully refreshed from Google Patents.
US4455680A
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Method and apparatus for receiving and tracking phase modulated signals
Assignee: National Aeronautics and Space Administration
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Filing: 1980-05-07
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Granted: 1984-06-19
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Expires: 2000-05-07
Abstract
Abstract A receiver for tracking and demodulating several types of phase modulated communications, either analog or digital data, for either residual carrier or suppressed carrier signal and for phase modulation or keying of two, four or higher phase angles, from 0° through 360°. A carrier component signal and a converted series sideband component signal are obtained from the incoming signal and summed to produce a carrier tracking signal, permitting more accurate tracking of the above types of phase modulated data.
Inventors
- 👤 Salvador Villarreal
- 👤 Stuart D. Lenett
- 👤 Herbert S. Kobayashi
- 👤 James F. Pawlowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:13
CPC Classifications
H; H03; H03D; H03D3/00; H03D3/02; H03D3/24; H03D3/241; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/227; H04L27/2275; H04L27/2277
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
117 words
A receiver for tracking and demodulating an incoming phase modulated communication signal, comprising: (a) oscillator means for forming a local reference signal; (b) phase detector means for detecting the phase of said incoming signal modulated with respect to said local reference signal; (c) means for obtaining a residual carrier signal from said phase detected signal and said incoming signal; (d) multiplier means for obtaining a converted series sideband carrier signal, representing the reconstructed incoming signal, from said phase detected signal and said incoming signal; and (e) means for summing said residual carrier signal and said converted series sideband carrier signal to form a tracking carrier signal for controlling said oscillator means thereby to track said incoming signal.
Claim 2
Dependent Claim
117 words
A receiver for tracking and demodulating an incoming phase modulated communication signal, comprising: (a) oscillator means for forming a local reference signal; (b) phase detector means for detecting the phase of said incoming signal modulated with respect to said local reference signal; (c) means for obtaining a residual carrier signal from said phase detected signal and said incoming signal; (d) multiplier means for obtaining a converted series sideband carrier signal, representing the reconstructed incoming signal, from said phase detected signal and said incoming signal; and (e) means for summing said residual carrier signal and said converted series sideband carrier signal to form a tracking carrier signal for controlling said oscillator means thereby to track said incoming signal.
Claim 3
Dependent Claim
41 words
The receiver of claim 1, wherein said means for summing comprises: means for weighted summing the residual carrier signal and the converted series sideband carrier signal to form a tracking carrier signal controlling said oscillator means to track the incoming signal.
Claim 4
Dependent Claim
50 words
The receiver of claim 1, wherein said oscillator mean comprises: (a) voltage controlled oscillator means forming the local reference signal at a frequency controlled by an input error signal; and (b) oscillator multiplier means for multiplying the tracking carrier signal with the local reference signal to form the error signal.
Claim 5
Dependent Claim
31 words
The receiver of claim 3, wherein said oscillator means further includes: loop filter means for passing the input error signal from said oscillator multiplier means to said voltage controlled oscillator means.
Claim 6
Dependent Claim
29 words
The receiver of claim 1, wherein said phase detector means comprises: detector multiplier means for multiplying the local reference signal with the incoming signal to detect the phase thereof.
Claim 7
Dependent Claim
34 words
The receiver of claim 1, wherein the incoming signal is a biphase signal and wherein said phase detector means comprises: phase detector multiplier means for multiplying the incoming signal with the local reference signal.
Claim 8
Dependent Claim
25 words
The receiver of claim 6, further including: means at the input of said phase detector means for multiplying for phase shifting the local reference signal.
Claim 9
Dependent Claim
17 words
The receiver of claim 1, further including: means for filtering the output of said phase detector means.
Claim 10
Dependent Claim
34 words
The receiver of claim 1, wherein the incoming signal is a quadriphase signal and wherein said phase detector means comprises: phase detector multiplier means for multiplying the incoming signal with the local reference signal.
Claim 11
Dependent Claim
61 words
The receiver of claim 9, wherein said phase detector means further comprises: (a) a phase shift circuit for shifting the phase of the local reference signal by -90°; (b) second phase detector multiplier means coupled to receive the phase shifted local reference signal and for multiplying the incoming signal with the phase shifted local reference signal from said phase shift circuit
Claim 12
Dependent Claim
54 words
The receiver of claim 10, wherein said multiplier means comprises: (a) means for phase shifting the incoming signal; (b) means for multiplying the phase-shifted incoming signal with the output of said first phase detector multiplier means; and (c) means for multiplying the incoming signal with the outputs of said second phase detector multiplier means.
Claim 13
Dependent Claim
31 words
The receiver of claim 11, wherein said means for summing comprises: means for summing the residual carrier signal with the outputs of both said means for multiplying in said multiplier means.
Claim 14
Independent Claim
103 words
A method of tracking and demodulating an incoming phase modulated communication signal, comprising the steps of: (a) forming a local reference signal; (b) detecting the phase of said incoming signal modulated with respect to said local reference signal; (c) obtaining a residual carrier signal from said phase detected signal and said incoming signal; (d) obtaining a converted series sideband carrier signal representing the reconstructed incoming signal from said phase detected signal and said incoming signal; and (e) summing said residual carrier signal and said converted series sideband carrier signal to form a tracking carrier signal for controlling the tracking of said incoming signal.
Claim 15
Independent Claim
103 words
A method of tracking and demodulating an incoming phase modulated communication signal, comprising the steps of: (a) forming a local reference signal; (b) detecting the phase of said incoming signal modulated with respect to said local reference signal; (c) obtaining a residual carrier signal from said phase detected signal and said incoming signal; (d) obtaining a converted series sideband carrier signal representing the reconstructed incoming signal from said phase detected signal and said incoming signal; and (e) summing said residual carrier signal and said converted series sideband carrier signal to form a tracking carrier signal for controlling the tracking of said incoming signal.
Claim 16
Dependent Claim
18 words
The method of claim 14, further including the step of: filtering the detected phase of the incoming signal.
Claim 17
Dependent Claim
30 words
The method of claim 13, wherein said step of summing comprises: weighted summing the residual carrier signal and the converted series sideband carrier signal to form the tracking carrier signal.
Claim 18
Dependent Claim
47 words
The method of claim 13, wherein said step of forming a local reference signal comprises: (a) forming the local reference signal at a frequency controlled by an input error signal; and (b) multiplying the tracking carrier signal with the local reference signal to form the error signal.
Claim 19
Dependent Claim
27 words
The receiver of claim 13, wherein said step of detecting the phase comprises: multiplying the local reference signal with the incoming signal to detect the phase thereof.
Claim 20
Dependent Claim
13 words
The method of claim 13, wherein the incoming signal is a bi-phase signal.
Claim 21
Dependent Claim
16 words
The method of claim 18, further including the step of: phase shifting the local reference signal.
Claim 22
Dependent Claim
31 words
The method of claim 13, wherein the incoming signal is a quadriphase signal, and wherein said step of detecting the phase comprises: multiplying the incoming signal with the local reference signal.
Claim 23
Dependent Claim
25 words
The method of claim 20, further including the step of: forming a signal representing the product of the incoming signal and the local reference signal.
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) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |