Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1987-12-22
1989-08-29
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367100, G01S 1566, G01S 1504
Patent
active
048624276
ABSTRACT:
A continuous-transmission frequency-modulated (CTFM) scan converted sonar with improved capability for detecting swimmers, miniature submarines and other small intruders in harbors and inlets, and adjacent offshore structures. The system is microprocessor based and menu driven from an operator interactive touch screen. The system utilizes a fast fourier transform (FFT) based frequency analyzer for range discrimination. An area moving target indicator (AMTI) portion of the system cancels echo returns from stationary objects that otherwise mask the echo return of the moving targets. The AMTI causes the system to survey the search area for a number of consecutive scans and store the data. On successive scans, only target information that differs from the stored target map is displayed, thereby reducing clutter caused by surrounding terrain. The AMTI can activate an audio alarm, transmit a serial data alarm message, start a video recorder and annotate the system display to identify the bearing and range of the moving target that has been detected.
REFERENCES:
patent: 4234880 (1980-11-01), Klemm
patent: 4318413 (1982-03-01), Kazuhiro
patent: 4339754 (1982-07-01), Hammers et al.
patent: 4383258 (1983-05-01), Morin
patent: 4566011 (1986-01-01), Lewis et al.
patent: 4626855 (1986-12-01), Rouse
Almagor David
Peters John M.
Ketema Inc.
Pihulic Daniel T.
Tarcza Thomas H.
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