Two-dimensional DOA estimation method of co-prime area array reduced dimension Capon

The invention discloses a dimension reduction Capon algorithm for performing two-dimensional DOA estimation on a plurality of signals under a co-prime area array. According to the algorithm, a covariance matrix of a received signal is obtained firstly, then a two-dimensional spectrum function is subjected to dimensionality reduction to one dimension, one-dimensional partial spectrum search is carried out on a local area by utilizing a linear relation between real DOA estimation and fuzzy DOA estimation, and fuzzy DOA estimation related to theoretical DOA can be obtained, so that the calculation complexity is remarkably reduced, and finally, the calculation efficiency is improved. And real DOA estimation can be obtained according to the property of the co-prime area array. Compared with a traditional co-prime area array two-dimensional Capon algorithm, the method has the advantages that almost the same DOA estimation performance can be obtained, meanwhile, huge operand caused by two-dimensional spectrum peak s