Adaptive clutter cancellation and interference rejection system

Details Adaptive clutter cancellation and interference rejection system Adaptive clutter cancellation and interference rejection system

1975-08-20

1976-11-30

Tubbesing, T.H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 77, G01S 942

Patent

active

039952711

ABSTRACT:
In an AMTI radar having digital doppler processing, adaptive clutter and interference rejection is achieved by automatically adjusting antenna phase and amplitude weights to trim for uncalibrated errors and to put nulls in the antenna receive patterns in the direction of the source of interference or jamming signals. Antenna weights are initially chosen to achieve an optimum signal to clutter ratio. The radar receive signals are averaged over many range cells, filtered and summed by adaptive processor circuits. Feedback loops adjust the antenna weights to minimize the summed output. The circuits effect this by mechanizing the steepest descent algorithm.

REFERENCES:
patent: 3725922 (1973-04-01), Brennan et al.
patent: 3727220 (1973-04-01), Brennan et al.

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