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US3600694A
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Power normalization of angular information from three-wire synchro source
Assignee: Collins Radio Co
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Filing: 1970-04-27
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Granted: 1971-08-17
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Expires: 1990-04-27
Abstract
Abstract An angle defining synchro output signal is subject to variation stemming from synchro induced phase shift and transformation ratio variations between units, as well as by variations in carrier excitation source amplitude. By converting a three-wire synchro output to respective carrier signals modulated by sine and cosine functions of the synchro signal information angle, demodulating each synchronously with respect to a signal phased in accordance with one of the sine and cosine modulated signals, and subsequently dividing the demodulator outputs, an output signal proportional to the ratio of the sine and cosine functions of the angle is obtained which is not affected by changes in synchro phase shift, transformation ratio, and carrier energization magnitude.
Inventors
- 👤 James H Mccollum Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:50
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/38; G08C19/46; G08C19/48; G06; G06G; G06G7/00; G06G7/12; G06G7/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
324 words
Means for extracting angular output information from a synchro angular information signal, comprising signal conversion means receiving said synchro signal as an input thereto and developing first and second output signals respectively proportional to the sine and cosine function of the angular information defined by said synchro signal, said synchro signal and the outputs from said conversion means comprising carrier signals the amplitude modulation and carrier phases of which define said angular information, a first synchronous demodulator means receiving said first converter output signal as a first input thereto, a second syncHronous demodulator receiving said second converter output signal as a first input thereto, a demodulator reference driver circuitry receiving said second converter output signal and developing an output with phase corresponding to one said converter output signals, means for applying the outputs from said demodulator reference driver circuitry as respective second inputs to each of said first and second synchronous demodulators, said synchronous demodulators being adapted to provide a direct current voltage output signal the magnitude of which is proportional to the modulation component of the first input thereto and the polarity of which is a function of the phase relationship between carrier component of the first input thereto and the output from said demodulator reference driver circuitry, signal dividing means, means for applying the outputs from said first and second synchronous demodulators as respective inputs to said signal dividing means, the output from said dividing means being proportional to the quotient of the output from said first synchronous demodulator divided by the output from said second synchronous demodulator whereas the output from said dividing means is proportional to the tangent of the angular information angle defined by said synchro input signal and is substantially unaffected by variations in amplitude of the energizing carrier signal source, by variations between transformation ratios of different ones of said synchro input sources which might be connected in circuit therewith, and by phase shift in said synchro.
Claim 2
Dependent Claim
324 words
Means for extracting angular output information from a synchro angular information signal, comprising signal conversion means receiving said synchro signal as an input thereto and developing first and second output signals respectively proportional to the sine and cosine function of the angular information defined by said synchro signal, said synchro signal and the outputs from said conversion means comprising carrier signals the amplitude modulation and carrier phases of which define said angular information, a first synchronous demodulator means receiving said first converter output signal as a first input thereto, a second syncHronous demodulator receiving said second converter output signal as a first input thereto, a demodulator reference driver circuitry receiving said second converter output signal and developing an output with phase corresponding to one said converter output signals, means for applying the outputs from said demodulator reference driver circuitry as respective second inputs to each of said first and second synchronous demodulators, said synchronous demodulators being adapted to provide a direct current voltage output signal the magnitude of which is proportional to the modulation component of the first input thereto and the polarity of which is a function of the phase relationship between carrier component of the first input thereto and the output from said demodulator reference driver circuitry, signal dividing means, means for applying the outputs from said first and second synchronous demodulators as respective inputs to said signal dividing means, the output from said dividing means being proportional to the quotient of the output from said first synchronous demodulator divided by the output from said second synchronous demodulator whereas the output from said dividing means is proportional to the tangent of the angular information angle defined by said synchro input signal and is substantially unaffected by variations in amplitude of the energizing carrier signal source, by variations between transformation ratios of different ones of said synchro input sources which might be connected in circuit therewith, and by phase shift in said synchro.
Claim 3
Dependent Claim
196 words
Means for converting a three-wire synchro input signal comprised of first, second, and third signal lines, the relative signal amplitudes between pairs of said lines and phases of voltage induced in said lines being collectively definitive of an information angle phi , means for converting said three-wire angular information input signal to first and second angular information signals respectively proportional to the sine and cosine functions of said information angle phi , means for demodulating each of said first and second last defined signals against a phase reference based on the phase of said signal proportional to cosine phi wherein first and second direct current voltage signals the amplitudes of which are respectively proportional to sine and cosine of the information angle phi are developed, and means for dividing said last named sine proportional signal with said last named cosine proportional signal to develop an output signal the magnitude of which is proportional to the tangent of said angular information signal phi , said output signal being unaffected by variations in synchro transformation ratios, by variations in the magnitude of the energizing carrier signal source for said synchro signal, and by phase shift in said synchro.
Claim 4
Dependent Claim
196 words
Means for converting a three-wire synchro input signal comprised of first, second, and third signal lines, the relative signal amplitudes between pairs of said lines and phases of voltage induced in said lines being collectively definitive of an information angle phi , means for converting said three-wire angular information input signal to first and second angular information signals respectively proportional to the sine and cosine functions of said information angle phi , means for demodulating each of said first and second last defined signals against a phase reference based on the phase of said signal proportional to cosine phi wherein first and second direct current voltage signals the amplitudes of which are respectively proportional to sine and cosine of the information angle phi are developed, and means for dividing said last named sine proportional signal with said last named cosine proportional signal to develop an output signal the magnitude of which is proportional to the tangent of said angular information signal phi , said output signal being unaffected by variations in synchro transformation ratios, by variations in the magnitude of the energizing carrier signal source for said synchro signal, and by phase shift in said synchro.
Claim 5
Dependent Claim
44 words
Means as defined in claim 1 wherein said information angle phi equals + or - n pi + theta and + or - n pi - theta , where n is an integer including the integer zero and theta is less than 90* .
Claim 6
Dependent Claim
44 words
Means as defined in claim 2 wherein said information angle phi equals + or - n pi + theta and + or - n pi - theta , where n is an integer including the integer zero and theta is less than 90* .
Claim 7
Dependent Claim
39 words
Means as defined in claim 1 wherein the angle defined by said synchro input signal varies between 0* or 180* plus or minus a predefined angle theta , where theta is greater than 0* and less than 90* .
Claim 8
Dependent Claim
39 words
Means as defined in claim 2 wherein the angle defined by said synchro input signal varies between 0* or 180* plus or minus a predefined angle theta , where theta is greater than 0* and less than 90* .
Claim 9
Dependent Claim
198 words
Means for converting a three-wire synchro input signal comprised of first, second, and third signal lines, the relative signal amplitudes between pairs of said lines and phases of voltage induced in said lines being collectively definiTive of an information angle phi , means for converting said three-wire angular information input signal to first and second angular information signals respectively proportional to the sine and cosine functions of said information angle phi , means for demodulating each of said first and second last defined signals against a phase reference based on the phase of at least one of said signals proportional to sine phi and cosine phi wherein first and second direct current voltage signals the amplitudes of which are respectively proportional to sine and cosine of the information angle phi are developed, and means for deriving the ratio of said last named signals to develop an output signal the magnitude of which is proportional to an angular function of said angular information signal phi , said output signal being unaffected by variations in synchro transformation ratios, by variations in the magnitude of the energizing carrier signal source for said synchro signal, and by phase shift in said synchro.
Claim 10
Dependent Claim
198 words
Means for converting a three-wire synchro input signal comprised of first, second, and third signal lines, the relative signal amplitudes between pairs of said lines and phases of voltage induced in said lines being collectively definiTive of an information angle phi , means for converting said three-wire angular information input signal to first and second angular information signals respectively proportional to the sine and cosine functions of said information angle phi , means for demodulating each of said first and second last defined signals against a phase reference based on the phase of at least one of said signals proportional to sine phi and cosine phi wherein first and second direct current voltage signals the amplitudes of which are respectively proportional to sine and cosine of the information angle phi are developed, and means for deriving the ratio of said last named signals to develop an output signal the magnitude of which is proportional to an angular function of said angular information signal phi , said output signal being unaffected by variations in synchro transformation ratios, by variations in the magnitude of the energizing carrier signal source for said synchro signal, and by phase shift in said synchro.
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |