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US4347480A
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Magnetic resonance gyro phase shifter
Assignee: Kearfott Guidance and Navigation Corp
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Filing: 1980-04-28
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Granted: 1982-08-31
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Expires: 2000-04-28
Abstract
Abstract A phase shifter of a signal processor which involves separation of the cell signals from a magnetic resonance gyro (MRG) using phase locked loops that also serve as frequency multipliers, phase shifting one cell output to maintain phase comparisons within the monotonic region of the phase detectors, PDM/Digital conversion of the MRG signals and finally microcomputer processing to obtain gyro angle to the required resolution and update rate.
Inventors
- 👤 Lincoln S. Ferriss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:45
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/58; G01C19/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
199 words
A phase shifter comprising: a source of input signals, a shift register containing eight images of said input signal, an eight channel multiplexer connected to said shift register for maintaining the phase shifted input signals within a selected monotonic range, an advancer retarder detector connected to the output of said eight channel multiplexer for developing an electronic window for retarding the input signals which fall within said electronic window, a gating circuit connected to the output of said advancer retarder detector, and a three stage up/down counter connected to the output of said gating circuit and providing a three bit address to the input of said eight channel multiplexer said gating circuit operative under said advancer retarder detector to alter the contents of said three stage counter whereby flip-flops in said counter determine a binary number 0 through 7 which represents closure of one of eight switches of said eight channel multiplexer, said altering of said counter causing switches in said eight channel multiplexer which were previously closed to open and causing adjacent switches which were previously open to close thereby connecting the correspondingly numbered state of said shift register to the output line of said eight channel multiplexer.
Claim 2
Dependent Claim
199 words
A phase shifter comprising: a source of input signals, a shift register containing eight images of said input signal, an eight channel multiplexer connected to said shift register for maintaining the phase shifted input signals within a selected monotonic range, an advancer retarder detector connected to the output of said eight channel multiplexer for developing an electronic window for retarding the input signals which fall within said electronic window, a gating circuit connected to the output of said advancer retarder detector, and a three stage up/down counter connected to the output of said gating circuit and providing a three bit address to the input of said eight channel multiplexer said gating circuit operative under said advancer retarder detector to alter the contents of said three stage counter whereby flip-flops in said counter determine a binary number 0 through 7 which represents closure of one of eight switches of said eight channel multiplexer, said altering of said counter causing switches in said eight channel multiplexer which were previously closed to open and causing adjacent switches which were previously open to close thereby connecting the correspondingly numbered state of said shift register to the output line of said eight channel multiplexer.
Claim 3
Dependent Claim
53 words
The phase shifter of claim 1 wherein said input signals to said shift register comprises: a source of signals from a magnetic resonance gyro which has been multiplied N times the original, and a source of clock pulses consisting of square waves at a frequency eight times that of said input gyro signals.
Claim 4
Dependent Claim
55 words
The phase shifter of claim 2 comprising: a second input signal from said gyro which has been multiplied N times the original connected to said advancer retarder whereby the relative phases between said first and second gyro signals which fall within said electronic window of said advancer retarder produce no activation of said shift register.
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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |