US3897918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interferometric rolling missile body decoupling guidance system
Assignee: United States Department of the Navy
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Filing: 1974-02-27
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Granted: 1975-08-05
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Expires: 1994-02-27
Abstract
Abstract A signal processing system for use on an interferometric rolling missile proportional guidance system is provided. The signal processor, upon receiving appropriate signals from antennae affixed to the missile airframe and from apparatus for measuring missile motion, subtracts airframe turning rates from the apparent target angle rates seen by the antennae in order to measure the true turning rate of a line-of-sight from the missile to the target.
Inventors
- 👤 Jr Joseph F Gulick
- 👤 James E Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:24
CPC Classifications
F; F41; F41G; F41G7/00; F41G7/20; F41G7/22; F41G7/222
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
330 words
A signal processor for use in a missile guidance system utilizing missile motion sensing means producing a signal representing missile motion in inertial space and interferometer means for producing signals representing an angle formed by a reference line and a line between said missile and a target, said signal processor comprising: means for producing a carrier frequency output signal, means connected to receive said signal representing missile motion and said carrier frequency output signal for phase modulating said cArrier frequency output signal with said signal representing missile motion to produce a phase modulated carrier signal, phase shifting means connected to receive said phase modulated carrier signal for producing first and second output signals displaced in phase quadrature relative to one another, first modulating means connected to receive a first output signal from said interferometer means and said first output signal from said phase shifting means for producing an output signal having the phase of said first signal from said interferometer shifted by the phase of said first output signal from said phase shifting means, second modulating means connected to receive a second output signal from said interferometer means and said second output signal from said phase shifting means for producing an output signal having a phase of said second signal from said interferometer shifted by the phase of said second output signal from said phase shifting means, signal combining means connected to receive said output signals from said first and second modulating means for producing a combined output signal representing said carrier frequency displaced in phase by an amount equal to the difference between the phase of said first and second interferometer signals and the phase of said missile motion modulated carrier signal, means connected to receive said combined output signal for extracting the phase modulation from said combined output signal and producing an output signal therefrom, and filter means connected to receive said extracted phase modulation signal for representing an output signal having all D.C. voltage components removed therefrom.
Claim 2
Dependent Claim
330 words
A signal processor for use in a missile guidance system utilizing missile motion sensing means producing a signal representing missile motion in inertial space and interferometer means for producing signals representing an angle formed by a reference line and a line between said missile and a target, said signal processor comprising: means for producing a carrier frequency output signal, means connected to receive said signal representing missile motion and said carrier frequency output signal for phase modulating said cArrier frequency output signal with said signal representing missile motion to produce a phase modulated carrier signal, phase shifting means connected to receive said phase modulated carrier signal for producing first and second output signals displaced in phase quadrature relative to one another, first modulating means connected to receive a first output signal from said interferometer means and said first output signal from said phase shifting means for producing an output signal having the phase of said first signal from said interferometer shifted by the phase of said first output signal from said phase shifting means, second modulating means connected to receive a second output signal from said interferometer means and said second output signal from said phase shifting means for producing an output signal having a phase of said second signal from said interferometer shifted by the phase of said second output signal from said phase shifting means, signal combining means connected to receive said output signals from said first and second modulating means for producing a combined output signal representing said carrier frequency displaced in phase by an amount equal to the difference between the phase of said first and second interferometer signals and the phase of said missile motion modulated carrier signal, means connected to receive said combined output signal for extracting the phase modulation from said combined output signal and producing an output signal therefrom, and filter means connected to receive said extracted phase modulation signal for representing an output signal having all D.C. voltage components removed therefrom.
Claim 3
Dependent Claim
34 words
The apparatus of claim 1 wherein said missile motion sensing means is a gyroscope in combination with a potentiometer and said means for producing a phase modulated signal comprises an automatic phase control loop.
Claim 4
Dependent Claim
19 words
The apparatus of claim 2 wherein said means for extracting the phase modulation comprises an automatic phase control loop.
Claim 5
Dependent Claim
43 words
The apparatus of claim 3 wherein said filter means for removing all D.C. voltage components acts as an integrator at said missile roll frequency and has a transfer function given by S divided by a quadratic equation, where S is the LaPlace operator.
Claim 6
Dependent Claim
15 words
The apparatus of claim 4 wherein said phase shifting means comprises divide-by-four frequency divider means.
Claim 7
Dependent Claim
44 words
The apparatus of claim 5 wherein said automatic phase control loop for extracting the phase modulation comprises amplifier means connected in parallel with integrator means producing a signal connected to voltage controlled oscillator means for producing a feedback signal of said phase control loop.
Claim 8
Dependent Claim
186 words
In a guidance system for steering a missile to a point of collision with a target, said system including a rolling interferometer producing first and second signals having a phase relationship representing an angle formed by a line between said missile and said target and a reference line, and a gyroscope producing an output signal representing angular motion of said missile; means for receiving said gyroscope output signal for producing first and second carrier signals phase modulated by said gyroscope signal and being displaced in phase quadrature relative to one another, modulator means connected to receive said first and second signals from said interferometer and said first and second phase modulated carrier signals for producing an output signal of frequency equal to said carrier signal frequency and having phase modulation representing the difference between said interferometer phase relationship and the phase of said gyroscope signal, means connected to receive said output signal from said modulator means for extracting the phase modulation components from said received signal and producing an output signal therefrom, and filter means connected to remove all D.C. voltage components from said extracted signal.
Claim 9
Dependent Claim
186 words
In a guidance system for steering a missile to a point of collision with a target, said system including a rolling interferometer producing first and second signals having a phase relationship representing an angle formed by a line between said missile and said target and a reference line, and a gyroscope producing an output signal representing angular motion of said missile; means for receiving said gyroscope output signal for producing first and second carrier signals phase modulated by said gyroscope signal and being displaced in phase quadrature relative to one another, modulator means connected to receive said first and second signals from said interferometer and said first and second phase modulated carrier signals for producing an output signal of frequency equal to said carrier signal frequency and having phase modulation representing the difference between said interferometer phase relationship and the phase of said gyroscope signal, means connected to receive said output signal from said modulator means for extracting the phase modulation components from said received signal and producing an output signal therefrom, and filter means connected to remove all D.C. voltage components from said extracted signal.
Claim 10
Dependent Claim
51 words
The apparatus of claim 7 whereIn said means for receiving said gyroscope output signal comprises, oscillator means for producing a carrier frequency output signal, and an automatic phase control loop in combination with phase shifting means said loop connected to receive said carrier frequency output signal and said gyroscope output signal.
Claim 11
Dependent Claim
38 words
The apparatus of claim 8 wherein said automatic phase control loop comprises, amplifier means connected in parallel with integrator means for producing a signal connected to voltage controlled oscillator means for producing said phase control loop feedback signal.
Claim 12
Dependent Claim
29 words
The apparatus of claim 9 wherein said means for extracting said phase modulation component comprises an automatic phase control loop containing integrator means and voltage controlled oscillator means therein.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |