Adapted pattern trough widening technique on GS algorithm

To widen adapted antenna pattern troughs on Gram-Schmidt (GS) algorithm in adaptive digital beamforming (ADBF), a mathematical model of adding more discrete interfering sources was constructed to change the interfering signal subspace, and then modified the covariance matrix of array snapshot data, while furthermore GS orthogonalized the covariance matrix. In the condition of high interference noses, adjusting the position and number of discrete interfering sources can obtain the expected trough width. The method is simple, easy to use and adds few load based on conventional GS algorithm. Computer simulation results showed validity of the proposed method.