Theoretical and experimental investigations of an adaptive 3element spatial filter
Abstract
Investigations of a threeelement adaptive line array (Triplet) are described. A calculation of the optimum filter weights is presented, which, in the mean square error sense, minimize the interference noise at the system output. It is shown that for the model chosen the output S/Nratio will, hereby, be maximized. As an appropriate system performance a gain factor is derived, based upon the ratio of the noise power at the conventional beam former to that one at the adaptive antenna output. The spatial distribution of the interference sources and the bandwidth influence were varied to study their effects on the performance. Another characteristic parameter, the adaption time of the system, was investigated for different interference configurations. The analog realization of the triplet, a threeelementcontrol loopprocessor is described, and experimental results are compared with the precalculated values.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 June 1976
 Bibcode:
 1976STIN...7724398W
 Keywords:

 Adaptive Filters;
 Antenna Design;
 Linear Arrays;
 Spatial Filtering;
 Analog Circuits;
 Differential Equations;
 Noise Reduction;
 Power Gain;
 Signal To Noise Ratios;
 Electronics and Electrical Engineering