High resolution method of DOA estimation based on the 4th-order cumulant slice in pseudo beam space
Yin Zhou · Systems engineering and electronics · 2006
In low signal to noise ratio(SNR) or colored spatial noise,performances of high resolution methods based on the second order statistics become worse rapidly.Based on the study on the 4th order cumulant slice MUSIC and the idea of high resolution methods in beam space,a high resolution method of DOA estimation based on the 4th order cumulant slice in pseudo beam space is derived.Analytic results show that,by using the higher order cumulant,white spatial Gaussian noise and colored spatial Gaussian noise can be restrained effectively and with beam space method,part of spatial noise can be filtered and the robustness of the algorithm can be enhanced.Computer simulation results show that compared with the 4th order cumulant slice MUSIC,the new estimator improves the estimating precision of DOA in low SNR and depresses the resolution threshold effectively in white spatial Gaussian noise and colored spatial Gaussian noise.