Communications: directive radio wave systems and devices (e.g. – Clutter elimination
Patent
1985-04-25
1989-05-09
Moskowitz, Nelson
Communications: directive radio wave systems and devices (e.g.,
Clutter elimination
G01S 1350
Patent
active
048293075
ABSTRACT:
A recursive radar filter arranged to provide filtering of ground clutter signals from radar echoes in the form of short batches of pulses. The filter includes a feed-forward section with delay, adder, and fixed amplifier elements. The filter also includes a feedback section which includes similar elements. Two time-varying amplifiers are included in the filter which change gain as the pulses are applied to the input of the filter. In a three delay version of the filter, the gain of one of the time-varying amplifiers is such that the feed-forward section of the filter does not pass any pulses until the fourth pulse has been applied to the filter. After the third pulse, the gain of this time-varying amplifier increases on each successive input pulse. In another embodiment, the two time-varying amplifiers are eliminated by making all of the fixed gain amplifiers time-varying in relationship with the interpulse period of the pulse input signal. Both arrangements allow recursive filtering without the need for extra pulses or pulse tapering to control transients in the filter.
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Hellner Mark
Moskowitz Nelson
Sutcliff W. G.
Westinghouse Electric Corp.
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