Sea velocity evaluator

Details Sea velocity evaluator Sea velocity evaluator

1991-01-22

1993-01-05

Barron, Jr., Gilberto

Communications: directive radio wave systems and devices (e.g.,

Clutter elimination

342 26, 342101, 342105, 342107, G01S 13524, G01S 1395

Patent

active

051774879

ABSTRACT:
Sea clutter can be removed from radar signals by accurately determining sea velocity in a coverage area of a radar scan, updating a median value for the coverage area, and selecting a clutter rejection filter for the coverage area biased on the median value for the coverage area. Preferably, a median sea velocity is stored for each coverage area, as the median value. When processing begins for a coverage area, a previously stored median sea velocity is retrieved and updated. The median sea velocity is updated by converting the median sea velocity into a median phase difference between two echo signals, based upon carrier frequency and the time between receipt of two echo signals, which is preferably more than one interpulse period. The difference in phase between the two echo signals is compared with the median phase difference and the median sea velocity is increased if the median phase difference is smaller and decreased if the median phase difference is larger. A rejection filter is selected based upon the previously stored median sea velocity (preferably after adjustment based on the carrier frequency) to remove the echoes from the sea from the radar echo signals.

REFERENCES:
patent: 4172255 (1979-10-01), Barrick et al.
patent: 4394658 (1983-07-01), Short, III
patent: 4709236 (1987-11-01), Taylor, Jr.
McGraw-Hill Dictionary of Scientific and Technical Terms, Third Ed., 1984, pp. 104, 985 and 989.

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