Direction-of-Arrival Estimation Method of Coherent Signals Based on Data Matrix Reconstruction for Conjugate ESPRIT(C-SPRIT)
Zhou Zheng-guang · Dianzi xuebao · 2009
A new algorithm has been presented to estimate the direction-of-arrival(DOA) in the presence of coherent signals.The conception of C-SPRIT has been used in our algorithm.By forming special data matrix,our algorithm performs well in estimation of DOA,no matter there are coherent signals or not.The DOA estimation of coherent signals has been mitigated by conventional spatial smoothing using the divided sub arrays.However,this result is obtained at the cost of losing effective spatial aperture,and the detectable number of coherent signals is 2N/3 at most(N is the number of array sensors).Compared with spatial smoothing method,our algorithm not only improves the estimation accuracy but also can detect N-1 coherent signals without aperture loss.The de-correlation of coherent signals is completely solved.The computational load is reduced by using the numerical algorithms of ESPRIT without spectral peak search.Computer simulation results are provided to verify the validity and superiority.