A Method of Suppressing Coherent Interference Based on Improved Nulling Technology

In the environment with coherent interferences, the common beam forming method has poor ability to suppress coherent interferences by estimating accurately the direction of arrival (DOA) of coherent signal and desired signal. The new anti-jamming technology based on multiple constrained least mean-square (MC-LMS) algorithm is proposed by the analysis of the coherent signal and the weighted vector two quadratic performance functions in the paper. The method uses MC-LMS algorithms calculates the weights for weighting the output of array signals, so the coherent interferences are suppressed by analyzing its spectrum. The algorithm has low computational complexity, high robustness and convergence. The results of simulation show that the coherent interference could be suppressed, the effectiveness of the proposed method are demonstrated with the complex electromagnetic environment.