Abstract: The invention is an improved clutter suppressor for MTI and pulse doppler radars operating so that the received clutter pulses are large enough to hard limit within the receiving system. It is especially useful for radars that use antenna beam scanning to perform tasks such as search, surveillance, and height finding because the combination of hard limiting with beam movement creates strong clutter residue at the output of a doppler filter. The invention can be implemented with either analog or digital technology, or with a digital processor and software.

Abstract: This invention improves the detection performance of doppler radar by censoring clutter at the output of the doppler processor, and it functions in operative association with a range CFAR. By a selective rejection of signals based on doppler characteristics and on signal amplitude, it will reduce the sum of clutter and noise at the input to the CFAR. Thus the CFAR detection threshold level is lowered, which thereby improves the detection performance for moving targets.

Abstract: The invention improves the radar detection capabilities for moving targets by censoring clutter and noise after it is outputted from a doppler processor. It effects the resulting clutter and noise suppression of doppler radars through use of thresholders that function in operative association, one principally for noise and the other principally for clutter.

Abstract: Clutter suppressors and methods of clutter suppression for radars which employ the doppler effect for enhancing signals due to moving targets relative to signals due to clutter caused by land, sea or rain. Specifically, the disclosure concerns suppressors and methods of clutter suppression for cw doppler, pulse doppler and MTI (moving target indication) radars. The suppressors reduce the occurrence of radar output due to clutter by permitting and prohibiting radar output on the basis of the strength of signals that contain doppler frequency components of the radar echo.

Abstract: Clutter suppressors and methods of clutter suppression for radars which employ the doppler effect for enhancing signals due to moving targets relative to signals due to clutter caused land, sea or rain. Specifically, the disclosure concerns suppressors and methods of clutter suppression for cw doppler, pulse doppler and MTI (moving target indication) radars. The suppressors reduce the occurrence of radar output due to clutter by permitting and prohibiting radar output on the basis of the relative strength of signals that contain doppler frequency components of the radar echo.

Abstract: This disclosure describes a radar clutter suppressor and target classifier that compares two or more video signals. Various signal conditioning and processing means are used for enhancing echo differences between targets and clutter caused by differences in polarization, carrier frequency, pulse length, antenna beamwidth, and antenna pointing direction. Signals are processed as if due to targets if the ratio of the video amplitudes are within a band of ratios and signals are suppressed as if due to clutter if the ratios are not within the band of ratios designated for targets. The invention includes methods for suppressing clutter caused by rain, land and sea.