Effects of Near-Field Scatterers on Space-Time Adaptive Processing
AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
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Near-field scatterers, such as the wing of an airplane, can affect the ability of the processor to null out clutter and jammer signals. The target, clutter, and jammer signals will reflect off the near-field scatterers into the array and appear to be coming from a direction different from their true sources. This thesis develops a theoretical model for the direct path and scattered path signals from the target, clutter, and jamming signals. The optimum weight vector, normally computed using the steering vector to the target and the covariance matrix of the undesired signals, must now include the effects of the scattered signals as well. This thesis shows that the space-time steering vector for the scattered signal can be written in a form similar to the direct path signal. The total space-time steering vector of a signal is the sum of the direct path and scattered path steering vectors associated with that signal.
- Active and Passive Radar Detection and Equipment
- Radiofrequency Wave Propagation