Clutter tracker using a smoothed doppler frequency measurement

Details Clutter tracker using a smoothed doppler frequency measurement Clutter tracker using a smoothed doppler frequency measurement

1976-05-26

1978-06-06

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5DP, 343 77, G01S 902, G01S 942

Patent

active

040939499

ABSTRACT:
A clutter tracker in which received clutter velocity signal is shifted to zero doppler in order that optimum moving target indicator (MTI) cancellaton can be achieved is disclosed. A frequency controllable voltage controlled crystal oscillator (VCXO) is used as the coherent oscillator (COHO) source. The subject digital system changes the VCXO output bus only once per dwell, thus allowing adequate filtering to achieve desired performance without adversely affecting tracking performance.

REFERENCES:
patent: 3617719 (1971-11-01), Wong et al.
patent: 3742500 (1973-06-01), Freedman
patent: 3755813 (1973-08-01), Evans et al.
patent: 3774206 (1973-11-01), Ranch
patent: 3852742 (1974-12-01), Fletcher et al.
patent: 3860924 (1975-01-01), Evans
patent: 3885238 (1975-05-01), Klein et al.
patent: 3962704 (1976-06-01), Evans
patent: 3972041 (1976-07-01), Howard
patent: 3987442 (1976-10-01), McLeod, Jr.
patent: 4003054 (1977-01-01), Goldstone

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