The invention relates to a DOA
estimation method for eliminating mutual
coupling influence based on a mixed modulus structure, and aims to solve the influence of limited number of
radio frequency chains and mutual
coupling effect of antenna arrays on DOA
estimation precision. The method comprises a DOA
estimation framework in two stages: in the first stage, a
spatial covariance matrix is reconstructed by selecting a middle subarray and combining a
diagonal loading technology, DOA is preliminarily estimated, and a mutual
coupling effect is relieved; and in the second stage, the DOA estimation precision is further improved by using full-array data and a super-
resolution algorithm, and high-resolution DOA estimation is realized by compensating a mutual
coupling effect. The invention also provides a corresponding
system design, which comprises a switching network, an
amplifier and a phase shifter and is used for dynamically adjusting the array to realize optimized
signal receiving and
processing. Compared with a traditional method, the method has the advantages that high DOA estimation precision can still be achieved under low
radio frequency chain configuration, and the method has remarkable performance advantages and practical application value.