Radar terrain signal simulator

Details Radar terrain signal simulator Radar terrain signal simulator

1976-01-26

1979-09-25

Hubler, Malcolm F.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307221R, 328 37, G01S 900, G11C 1900

Patent

active

041685822

ABSTRACT:
To simulate the radar return from terrain of particular generic type (e.g. desert, forest, cultivated land) it is a known suggestion to employ closed-loop shift register with feedback suitable to produce particular "texture" of return from specified terrain. It is here disclosed to synchronize output of such register with azimuthal position of simulated search radar; but this alone gives "grainy" effect because "smeary" or slowly changing amplitude with range in PPI sweep is not matched by corresponding lateral, or azimuthal, "smear". This objectionable effect is overcome by providing three sets of output terminals on feedback register, giving outputs corresponding to shifts for azimuths N, N+1, and N+2. By buffing together the three outputs, an azimuthal variation at a slow rate, comparable with the variation with range, is obtained, giving a more deceptive (and thus better) simulation.

REFERENCES:
patent: 3069657 (1962-12-01), Green, Jr. et al.
patent: 3535642 (1970-10-01), Perlman
patent: 3700780 (1972-10-01), Roeschelein
patent: 3718863 (1973-02-01), Perlman
patent: 3742381 (1973-06-01), Hurd
patent: 3766316 (1973-10-01), Hoffman et al.
patent: 3783172 (1974-01-01), Bernstein
patent: 3800440 (1974-04-01), Membrino et al.
patent: 3829596 (1974-08-01), Murphree

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