Diagonal loading robust beamformer based on miscellaneous errors
ZENG Hao,ZHANG Lei,YANG Shi-zhong,LIU Ling
(College of Communication Engineering, Chongqing University,Chongqing 400030,China)
Abstract:In order to calibrate the array errors, diagonal loading is used in the robust beamformer. Compared with the traditional beamformer, the new algorithm outperformed in two sides. One was that all kinds of errors were considered with the correct math models. On the other hand, the covariance matrix was preprocessed before calculating the optimum diagonal loading factor, which could get rid of some errors and improve the performance of diagonal loading method. The error models, approaches of preprocessing and diagonal loading factor calculating were proposed. Furthermore, the simulations certify the virtue of the new algorithm.
Key words:robust beamformer; diagonal loading; covariance matrix ......