Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-06-27
1976-11-23
Tubbesing, T.H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 7A, 343 77, G01S 942
Patent
active
039939944
ABSTRACT:
Clutter cancellation between adjacent channels of a multichannel synthetic aperture AMTI radar is accomplished by delaying signals from the forward channel to coincide with signals from the aft channel and subtracting the outputs. Adverse effects from unknown, uncalibrated and time varying parameters are compensated for by adjusting the phase and amplitude of the aft channel coherent receiver output in response to the complex multiplier signal .omega.. The synthetic aperture processing circuit outputs of each channel are averaged over many range cells and summed to determine clutter magnitude. The complex multiplier signal .omega. is made to minimize the clutter magnitude by means of a steepest descent algorithm. A mathematical expression relating the complex multiplier signal .omega. to clutter magnitude for optimum clutter cancellation is developed and a circuit is provided for mechanizing the process.
REFERENCES:
patent: 3725922 (1973-04-01), Brennan et al.
patent: 3727220 (1973-04-01), Brennan et al.
patent: 3735399 (1973-05-01), Sletten et al.
patent: 3882498 (1975-05-01), McGuffin
Matthews, Jr. Willard R.
Rusz Joseph E.
The United States of America as represented by the Secretary of
Tubbesing T.H.
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