Utilization of entire transmitted bandwidth in continuous transm

Details Utilization of entire transmitted bandwidth in continuous transm Utilization of entire transmitted bandwidth in continuous transm

1982-01-11

1984-05-15

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

343 5NQ, G01S 1534

Patent

active

044492090

ABSTRACT:
A continuous transmission FM sonar avoids target ambiguities while utiliz the entire transmitted bandwidth for echo analysis. The sonar is characterized by digital generation of direct and quadrature versions of the transmitted frequency sweep, and balanced modulators responsive thereto to effect complex demodulation of the returned signals prior to analysis, as by a fast fourier transform frequency analyzer for target detection.

REFERENCES:
patent: 2977568 (1961-03-01), Roshon, Jr. et al.
patent: 3140461 (1964-07-01), McKinney
patent: 4384291 (1983-05-01), Lewis et al.
patent: 4398275 (1983-08-01), Zehner

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