CW radar AM-noise video-cancellation system

Details CW radar AM-noise video-cancellation system CW radar AM-noise video-cancellation system

1977-08-17

1978-09-19

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 740

Patent

active

041157745

ABSTRACT:
AM noise produced by a CW or FM-CW radar transmitter can be cancelled from the radar receiver output by use of a servo system working at video frequencies. A fixed pair of AM sidebands is deliberately added to the source, using a known discrete modulating frequency. A demodulated sample of the total AM noise produced by the source is obtained from a single ended mixer. The servo system adjusts the gain of an amplifier processing this noise, until the level of the demodulated test signal is equal to the level of the demodulated test signal at the output of the radar receiver. The two video signals are then subtracted, cancelling the test tone from the receiver output and incidentally also cancelling the AM source noise from the output of the system.

REFERENCES:
patent: 4021804 (1977-05-01), Dounce et al.
patent: 4060806 (1977-11-01), Davies et al.

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