US4989186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Target tracking sonar with false target detector
Assignee: United States Department of the Navy
•
Filing: 1982-08-16
•
Granted: 1991-01-29
•
Expires: 2002-08-16
Abstract
Abstract A target tracking sonar system associated with a moving platform incorporates a Kalman filter model and a false target detection capability characterized by comparison of the estimated and actual acceleration to produce an error value which, if greater than a predetermined threshold, namely the product of one half the estimated acceleration and the internal between periodic acceleration updates, generates a signal condition to flag the false target.
Inventors
- 👤 Dennis W. Ricker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:57
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/66
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
A sonar system carried by a moving platform, and operative to track a sonar target, said system comprising: active sonar means for obtaining target relative position data; means for providing platform motion data; means responsive to said relative position data and said platform motion data to provide target actual acceleration data; Kalman filter means for generating a math model target track characterized by estimated acceleration data; and false target detection means for generating a predetermined output condition whenever said actual acceleration data differs from said estimated acceleration data by acceleration error that is more than a predetermined threshold error value.
Claim 2
Dependent Claim
100 words
A sonar system carried by a moving platform, and operative to track a sonar target, said system comprising: active sonar means for obtaining target relative position data; means for providing platform motion data; means responsive to said relative position data and said platform motion data to provide target actual acceleration data; Kalman filter means for generating a math model target track characterized by estimated acceleration data; and false target detection means for generating a predetermined output condition whenever said actual acceleration data differs from said estimated acceleration data by acceleration error that is more than a predetermined threshold error value.
Claim 3
Dependent Claim
29 words
A sonar system as defined in claim 1, and wherein: said sonar means operates to obtain said target data at intervals for periodic updating of said Kalman filter means.
Claim 4
Dependent Claim
39 words
A sonar system as defined in claim 2, and wherein: said false target detection means comprises means for producing an output representative of said acceleration error as the difference between said actual acceleration data and said estimated acceleration data.
Claim 5
Dependent Claim
24 words
A sonar system as defined in claim 3, and wherein: said false target detection means comprises thresholder means for producing said predetermined output condition.
Claim 6
Dependent Claim
27 words
A sonar system as defined in claim 4, and wherein: said predetermined threshold error value is proportional to one half the estimated acceleration times said updating interval.
Claim 7
Dependent Claim
20 words
A sonar system as defined in claim 5, and wherein: said estimated acceleration data is characterized by equal vector components.
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) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |