Patent US3596182A successfully refreshed from Google Patents.
US3596182A
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US
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Multipath delay and correlation bandwidth analyzer
Assignee: United States Department of the Air Force
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Filing: 1969-05-15
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Granted: 1971-07-27
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Expires: 1989-05-15
Abstract
Abstract Multipath delay is analyzed by generating and transmitting a pseudorandom signal and at the receiver the reverse replica of the transmitted signal is also generated. The two signals are correlated in an optical correlator where they are passed through ultrasonic modulators while collimated light passes through them and the output is read out on an oscilloscope.
Inventors
- 👤 Ronald R Menard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:52
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/005; G; G01; G01R; G01R25/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
A multipath delay analyzer comprising; a. a transmitter frequency source; b. transmitter means for generating a pseudorandom code fed by the transmitter frequency source; c. a transmitter balanced modulator fed by the frequency source and the output of the transmitting pseudorandom code generating means; d. means for transmitting the modulated signal; e. a receiver frequency source; f. a first receiver means fed by the receiver frequency source for generating a random code inverse to that generated by the transmitter generating means; g. a receiver balanced modulator fed by the receiver frequency source and the first receiver generating means; and h. means for optically correlating the outputs of the receiver modulator and the transmitted signal from transmitter means.
Claim 2
Dependent Claim
117 words
A multipath delay analyzer comprising; a. a transmitter frequency source; b. transmitter means for generating a pseudorandom code fed by the transmitter frequency source; c. a transmitter balanced modulator fed by the frequency source and the output of the transmitting pseudorandom code generating means; d. means for transmitting the modulated signal; e. a receiver frequency source; f. a first receiver means fed by the receiver frequency source for generating a random code inverse to that generated by the transmitter generating means; g. a receiver balanced modulator fed by the receiver frequency source and the first receiver generating means; and h. means for optically correlating the outputs of the receiver modulator and the transmitted signal from transmitter means.
Claim 3
Dependent Claim
106 words
A multipath delay analyzer according to claim 1 wherein the optical correlator comprises: a. means for producing collimated light; b. a first ultrasonic light modulator positioned for the passage of collimated light fed by the output of the receiver balanced modulator; c. a second light modulator fed by the transmitter balanced modulator, in parallel alignment with the first light modulator with respect to the modulator signal, and fed in the reverse direction to the first ultrasonic light modulator; and d. a photomultiplier adjacent to the second light modulator and positioned for the reception of light passing therethrough, the output of the photomultiplier representing the correlation function.
Claim 4
Dependent Claim
69 words
A multipath delay analyzer according to claim 1 which further comprises: a. a second receiver means fed by the receiver frequency source for generating a second pseudorandom code identical to that generated by the transmitter generating means; b. an error counter fed by the second receiver generating means and the transmitted signal from the transmitting means; and c. reshaping means interposed between the error counter and the transmitting means.
Claim 5
Dependent Claim
28 words
A multipath delay analyzer according to claim 2 which further comprise a pair of polarizers, one each in parallel juxtaposition to the outer surfaces of each light modulator.
Claim 6
Dependent Claim
17 words
A multipath delay analyzer according to claim 4 wherein the light modulators comprise fused silica delay lines.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |