Variance reduction of source-tracking response zeros of adaptivearrays in the presence of errors

摘要

A new technique to reduce the variances of the source-trackingnresponse zeros of power inversion arrays in the presence of randomnamplitude and phase errors is investigated. Essentially, the ten,nvariances are reduced by dividing the original system into severalnspatially shifted power inversion arrays, averaging the weight vectorsnof these arrays, and determining the zeros of the spatially averagednweight vector. Equations for the optimal averaging weights and thenensuing variance performance are derived and verified by simulationnresults. It is found that the new technique may reduce the zero variancensubstantially when compared with taking the entire system as a singlenarray