Efficient wideband jammer nulling when using stretch processing

Techniques are described for performing adaptive jammer nulling over extrem ely wide bandwidths on radar systems which use linear frequency modulated ( LFM) waveforms and stretch processing. It is assumed that the range uncerta inty of the target is a small percentage of the equivalent range extent of the uncompressed pulse. The assumption allows the cancellation to take plac e following stretch processing in either the time domain using a narrowband sliding filter that keeps up with the chirp rate or in the frequency domai n. The new approach supports nulling performance over gigahertz of bandwidt h comparable to that previously achieved over a few megahertz using approxi mately the same number of spatial degrees of freedom.