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

88Figure 5.3 CSNR vs Rank order with large clutter fieldIn Figures 5.3 and 5.4 the clutter was located in the angular sector of 0 to 180degrees. The CNR per channel was 10 dB. The construction of P and U for thevarious techniques was performed as in Figures 5.1(a) and 5.2(a). As shown in thefigures, the peak for the eigencanceler, CSM, reduced-rank GSC, and PC-SMI occurat a rank of p = 8. As expected, the more extended clutter leads to a larger numberof principal values. As in the other simulations, the eigencanceler, CSM, PC-SMI,and reduced-rank GSC are in close agreement, The DCT and DFT reduced-ranktransformations do not perform as well in this scenario. This is due to the lowercapability of these techniques to concentrate the clutter power in a limited numberof principal values.In Figure 5.5, the distribution of p based on 20,000 runs is shown for severalreduced-rank methods, as well as for full-rank SMI. The reduced-rank methodswere: eigencanceler, DCT, DFT, and CSM based on the eigen-decomposition andimplemented as a GSC. In the case without the jammer, the number of principalcomponents used to generate the results shown in Figure 5.5(a) was p 4 for all