A coherent source DOA estimation method, system, device and storage medium

Abstract

The application relates to a coherent source DOA estimation method, system, device and storage medium, and belongs to the technical field of metasurface signal processing. The method comprises the following steps: a model of an orthogonal modulation metasurface array in which metasurface units are uniformly arranged is established, the model is used to perform time-space modulation on an incident signal, and a single-channel receiving signal is formed; the receiving signal is sequentially subjected to despread, frequency down-conversion, integral zero filter and de-coherence processing based on forward and backward space smoothing technology, and an observation vector is obtained; the observation vector is input into a trained deep unfolding ADMM network, sparse feature extraction, physical constraint projection and dual residual updating are sequentially performed, a sparse spatial spectrum vector is obtained and is mapped into a spatial power spectrum vector, and a DOA estimation value is determined by performing spectrum peak searching on the spatial power spectrum vector. The method can realize high-precision and high-efficiency DOA estimation under a low signal-to-noise ratio condition, and has higher reliability.

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