Foliage Clutter Rejector.
DEPARTMENT OF THE NAVY WASHINGTON DC
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The present invention relates to foliage-penetration surveillance radar and in particularly to a means of rejecting radar clutter from foliage while enhancing the radar return from a radially-moving target. This is accomplished by integrating two half cycles of the Doppler signal representing movement of a target. Signals from a balanced processor are sampled at a constant rate, integrated and then divided by the number of samples. Two averages are obtained a positive half cycle average and a negative half cycle average. Over a long period, clutter contributions tend to cancel. Target dominance is thus enhanced by integrating over half cycles rather than full cycles. A single cycle bias finder adds half cycle averages to obtain a cycle bias. The single cycle bias is fed to the moving average integrator where it is integrated over an optimum number of cycles. Obtaining the moving average reduces the chance that a single cycle bias can cause the average to exceed the threshold while a radially moving target will be detected.
- Active and Passive Radar Detection and Equipment