US3978445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asw intercept localization sonar
Assignee: United States Department of the Navy
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Filing: 1974-11-19
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Granted: 1976-08-31
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Expires: 1994-11-19
Abstract
Abstract A sonar for detecting and localizing sources of high frequency sonar pulsesn range and bearing in real time. Three hydrophones pick up sonar pulses and process them in their respective detectors for storing. Detection by all three detectors cause the stored signals to be sent to a cross-correlator computer for range and bearing calculation.
Inventors
- 👤 Gerald F. Gravett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:24
CPC Classifications
G; G01; G01S; G01S11/00; G01S11/14; G01S3/00; G01S3/80; G01S3/802; G01S3/808; G01S5/00; G01S5/18; G01S5/28; Y; Y10; Y10S; Y10S367/00; Y10S367/901
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
250 words
A device for automatically detecting and localizing sources of high frequency sonar pulses in real time both in range and bearing, comprising: a plurality of hydrophones colinearly spaced apart parallel to the major dimension of a broad based platform for reception of narrowband sonar signals; a plurality of auto correlation means each corresponding to a different one of said hydrophones and continuously producing detect signals upon reception of said sonar signals within said narrow-band at the corresponding one of said hydrophones by convoluting said sonar signal with its mirror image; logic means for generating a bearing signal in dependence upon the delay between the initiation of a first pair of said detect signals, for generating a pulse upon a favorable comparison of the bearing signal to a threshold value, for generating a first difference signal in dependence upon the delay between the initiation of a second pair of said detect signals, for generating a range signal in dependence upon the difference between the bearing signal and the first difference signal; cross correlation means for generating a first correction signal in dependence upon the phase different between a first pair of said sonar signals and for generating a second correction signal in dependence upon the phase difference between a second pair of said sonar signal upon reception of said pulse; and means for calculating the range of any said sonar source in dependence upon each of said detect signals, said bearing and range signals, and said first and second correction signals.
Claim 2
Independent Claim
250 words
A device for automatically detecting and localizing sources of high frequency sonar pulses in real time both in range and bearing, comprising: a plurality of hydrophones colinearly spaced apart parallel to the major dimension of a broad based platform for reception of narrowband sonar signals; a plurality of auto correlation means each corresponding to a different one of said hydrophones and continuously producing detect signals upon reception of said sonar signals within said narrow-band at the corresponding one of said hydrophones by convoluting said sonar signal with its mirror image; logic means for generating a bearing signal in dependence upon the delay between the initiation of a first pair of said detect signals, for generating a pulse upon a favorable comparison of the bearing signal to a threshold value, for generating a first difference signal in dependence upon the delay between the initiation of a second pair of said detect signals, for generating a range signal in dependence upon the difference between the bearing signal and the first difference signal; cross correlation means for generating a first correction signal in dependence upon the phase different between a first pair of said sonar signals and for generating a second correction signal in dependence upon the phase difference between a second pair of said sonar signal upon reception of said pulse; and means for calculating the range of any said sonar source in dependence upon each of said detect signals, said bearing and range signals, and said first and second correction signals.
Claim 3
Dependent Claim
41 words
The device of claim 1 wherein said logic means includes frequency comparison logic for generating an adverse signal upon the detection of frequency instability in any of said detect signals, wherein the corresponding said sonar signal is ignored by said device.
Claim 4
Dependent Claim
35 words
The device of claim 1 wherein said logic means includes circuitry for generating and adverse signal upon an unfavorable comparison of the sequence in which said detect signals occur to a selected set of sequences.
Claim 5
Dependent Claim
53 words
The device of claim 1 wherein said logic means includes a plurality of counters each adapted to receive one of said detect signals and each coupled in parallel with a comparator for generating an adverse signal upon an unfavorable comparison of the pulse lengths of said detect signals to a selected pulse length.
Claim 6
Dependent Claim
28 words
The device of claim 2 wherein said logic means for detection of frequency instability of said detect signals constitutes a frequency counter, a delay line and a comparator.
Claim 7
Dependent Claim
42 words
The device of claim 1 wherein said logic means includes a minor comparator logic circuit adapted to receive said first difference signal, for generating an adverse signal upon an unfavorable comparison of said first difference signal to a selected minimum range value.
Claim 8
Dependent Claim
40 words
The device of claim 1 wherein said logic means includes a major comparator logic circuit adapted to receive said range signal, for generating an adverse signal upon an unfavorable comparison of said range signal to a selected maximum range value.
Claim 9
Dependent Claim
40 words
The device of claim 1 wherein said logic means includes a threshold comparator logic circuit adapted to receive said bearing signal, for generating an adverse signal upon an unfavorable comparison of said bearing signal to a selected maximum bearing value.
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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |