US3763465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing deviation indicator
Assignee: United States Department of the Army
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Filing: 1971-03-09
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Granted: 1973-10-02
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Expires: 1991-03-09
Abstract
Abstract The disclosure describes an improved bearing deviation indicator for detecting and tracking noise sources such as, for example, those produced by vehicles. The device comprises a rotatable acoustic array which generates electrical analogs of the noise waves which are coupled to novel signal processing means which produce signals indicative of alignment of the acoustic array with the noise source or deviation of the acoustic array from the noise source. The signals are coupled to servo means which in response thereto rotates the array to align it with the noise source.
Inventors
- 👤 R Tatge
- 👤 R Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:24
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/80; G01S3/802; G01S3/805; G01S3/807
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
326 words
A bearing deviation indicator for tracking and pinpointing a noise source and having a great rate of change of error signal per degree of angle deviation from the noise source comprising in combination: first and second longitudinally disposed electro-acoustical directive arrays crossed at their centers whereby their effective receptive paths are crossed; said first directive array comprising a first group of connected spaced microphones extending outwardly of the center of the array and a second group of connected spaced microphones extending outwardly of the center of the array diametrically opposite to said first group of microphones; said second directive array comprising a third group of connected spaced microphones extending outwardly of the center of the array and a fourth group of connected spaced microphones extending outwardly of the center of the array diametrically opposite to said third group of microphones; a first polarity-coincidence correlator having one input coupled to said first group of microphones and another input coupled to said second group of microphones for processing the electrical analog signals produced by said first and second groups of microphones in response to said noise source with respect to deviation of said first array from said noise source whereby a positive going signal is produced in the output thereof; a second polarity-coincidence correlator having one input coupled to said third group of microphones and another input coupled to said fourth group of microphones through phase shift means for processing the electrical analog signals produceD by said third and fourth groups of microphones in response to said noise source with respect to the deviation of said second array from said noise source whereby a negative going signal is produced in the output thereof; summing means bridged acrossed the outputs of said first and second polarity-coincidence correlators producing error signals in response to said output signals; and means responsive to said error signals coupled to said directive arrays whereby said directive arrays are subsequently aligned with the noise source.
Claim 2
Dependent Claim
326 words
A bearing deviation indicator for tracking and pinpointing a noise source and having a great rate of change of error signal per degree of angle deviation from the noise source comprising in combination: first and second longitudinally disposed electro-acoustical directive arrays crossed at their centers whereby their effective receptive paths are crossed; said first directive array comprising a first group of connected spaced microphones extending outwardly of the center of the array and a second group of connected spaced microphones extending outwardly of the center of the array diametrically opposite to said first group of microphones; said second directive array comprising a third group of connected spaced microphones extending outwardly of the center of the array and a fourth group of connected spaced microphones extending outwardly of the center of the array diametrically opposite to said third group of microphones; a first polarity-coincidence correlator having one input coupled to said first group of microphones and another input coupled to said second group of microphones for processing the electrical analog signals produced by said first and second groups of microphones in response to said noise source with respect to deviation of said first array from said noise source whereby a positive going signal is produced in the output thereof; a second polarity-coincidence correlator having one input coupled to said third group of microphones and another input coupled to said fourth group of microphones through phase shift means for processing the electrical analog signals produceD by said third and fourth groups of microphones in response to said noise source with respect to the deviation of said second array from said noise source whereby a negative going signal is produced in the output thereof; summing means bridged acrossed the outputs of said first and second polarity-coincidence correlators producing error signals in response to said output signals; and means responsive to said error signals coupled to said directive arrays whereby said directive arrays are subsequently aligned with the noise source.
Claim 3
Dependent Claim
20 words
The invention in accordance with claim 1 wherein the microphones of each said array are shaped for optimum side-lobe suppression.
Claim 4
Dependent Claim
37 words
The invention in accordance with claim 2 wherein said summing means comprises first and second series connected resistors forming a summing point at their juncti0n and bridged across the outputs of said first and second polarity-coincidence correlators.
Claim 5
Dependent Claim
18 words
The invention in accordance with claim 3 wherein said phase shift means comprises a 180* phase shift means.
Claim 6
Dependent Claim
30 words
The invention in accordance with claim 4 wherein said means responsive to said error signals comprises servo means adapted to orient said directive arrays in response to the error signals.
References Cited (Backward Citations)
US3348195A
Cited
US3154778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |