US3555261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state analog computer-type calibrator for a radio interferometer
Assignee: United States Department of the Army
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Filing: 1968-10-28
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Granted: 1971-01-12
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Expires: 1988-10-28
Abstract
Abstract A solid state multiplier for an analogue computer which permits the unique determination of the bearing and elevation angles of arrival of a signal ray. The multiplier provides solutions to a set of interferometer descriptive equations corresponding to data supplied by three two-element interferometers and a centralcrossed Adcock array.
Inventors
- 👤 William Christian Mcclurg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:13
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/16; G06G7/163; G06G7/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
189 words
A solid state multiplier comprising: a gate generator responsive to any suitable source of alternating current, said generator effective for producing a gating signal corresponding to a predetermined number of cycles of the input AC source; a ramp generator electrically connected to said gate generator, whereby a linear voltage ramp is provided at the output terminal of said ramp generator in response to and for the duration of each gating signal; an analogue input signal source for providing a trigonometric representation of the bearing and elevation angles of arrival of an input signal ray; a sample and hold circuit connected to the same input alternating current source as said gate generator; comparator means for comparing said input analogue signal with said ramp signal and, upon detection of both signals being of equal value, for providing a trigger signal to said sample and hold circuit; said sample and hold circuit activated by said trigger pulse from said comparator means for providing an output signal indicative of the phase and amplitude of said alternating current input signal at the instant the ramp signal and the analogue signal are of equal amplitude.
Claim 2
Dependent Claim
189 words
A solid state multiplier comprising: a gate generator responsive to any suitable source of alternating current, said generator effective for producing a gating signal corresponding to a predetermined number of cycles of the input AC source; a ramp generator electrically connected to said gate generator, whereby a linear voltage ramp is provided at the output terminal of said ramp generator in response to and for the duration of each gating signal; an analogue input signal source for providing a trigonometric representation of the bearing and elevation angles of arrival of an input signal ray; a sample and hold circuit connected to the same input alternating current source as said gate generator; comparator means for comparing said input analogue signal with said ramp signal and, upon detection of both signals being of equal value, for providing a trigger signal to said sample and hold circuit; said sample and hold circuit activated by said trigger pulse from said comparator means for providing an output signal indicative of the phase and amplitude of said alternating current input signal at the instant the ramp signal and the analogue signal are of equal amplitude.
Claim 3
Dependent Claim
39 words
The multiplier as set forth in claim 1, further including a feedback circuit from the output of the ramp generator to the gate generator whereby the period of the ramp signal is controlled both as to length and slope,
Claim 4
Dependent Claim
83 words
The multiplier as set forth in claim 1, further including at least two sample and hold circuits, wherein both of said circuits are connected to be simultaneously activated upon the receipt of a trigger pulse from said comparator with each of said sample and hold circuits being connected to said source of alternating current, one circuit connected for zero degree phase angle reception and the other circuit connected for 90* phase angle reception thus providing sine and cosine functions respectively as output signals.
Claim 5
Dependent Claim
83 words
The multiplier as set forth in claim 2, further including at least two sample and hold circuits, wherein both of said circuits are connected to be simultaneously activated upon the receipt of a tRigger pulse from said comparator with each of said sample and hold circuits being connected to said source of alternating current, one circuit connected for zero degree phase angle reception and the other circuit connected for 90* phase angle reception thus providing sine and cosine functions respectively as output signals.
Claim 6
Dependent Claim
74 words
The apparatus as set forth in claim 3, wherein the gating signal produced by the gate generator is of rectangular form, said analogue input signal takes the form of n pi cos Alpha sin theta where n pi represents the wavelength or number of radians over which the interferometer base covers and the angles Alpha and theta represent respectively, the angle of incidence and angle of azimuth of an input ray to the interferometer.
Claim 7
Dependent Claim
74 words
The apparatus as set forth in claim 4, wherein the gating signal produced by the gate generator is of rectangular form, said analogue input signal takes the form of n pi sin theta cos Alpha where n pi represents the wavelength or number of radians over which the interferometer base covers and the angles Alpha and theta represent respectively, the angle of incidence and angle of azimuth of an input ray to the interferometer.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |