Space/time/frequency methods in adaptive radar - New Jersey ...

103Figure 5.15 Angle scan with the target not included in the trainingwhere M is the number of range cells for which there is a target return and a mare the target complex amplitudes. As the size of the training region (i.e. K) isincreased, and since the number of range cells containing the target is kept fixed, thesignal power decreases with respect to the interference. Thus at large K, the effectof the target presence in the training data should be negligible. A measure of targetcancellation at the array output is provided by the ratio r of the target power at thearray output when training is done over a subset of cells including the target cellto the target power when training is done over all of the range cells. The quantity1 — r measures the target cancellation relative to training over the full range interval.This quantity was computed from the Mountain-Top data, and is plotted in Figure5.16 . The eigencanceler, DCT, and DFT methods exhibit lower signal cancellationthan the SMI and CSM.