THE EFFECTS OF ARRAY CALIBRATION ERRORS ON DF-BASED SIGNAL COPY PERFORMANCE

This paper studies the effect of array calibration errors on the perfo rmance of various direction finding (DF) based signal copy algorithms, Unlike blind copy methods, this class of algorithms requires an estim ate of the directions of arrival (DOA's) of the signals in order to co mpute the copy weight vectors, Under the assumption that the observati on time is sufficiently long, the following algorithms are studied: cl assical beamforming, least squares, total least squares, linearly cons trained minimum variance beamforming, and structured stochastic estima tion, Expressions for the mean-square error of the signal estimates ar e derived as a function of the calibration errors for both the case wh ere the DOA's are known precisely and for the case where the DOA's mus t be estimated.