Matrix Circular Restruction Algorithm for DOA Estimation Based on Hybrid Arrays

Angle estimation of coherent source has always been an important challenge in radar angle measurement. Based on the assumption of uniform array, some mode space-based decoherence algorithms is proposed to solve the problem of target angle estimation under coherent interference conditions. However, the above algorithms have poor adaptability to composite arrays. In the present work, a decorrelation algorithm based on matrix cyclic reconstruction is proposed for coherent multi-source angle measurement in composite arrays. By utilizing the spatial filtering characteristics of antenna outside the circular array, it effectively solves the problem of coherent source angle estimation when the number of sources exceeds the number of elements. The simulation results show that the proposed algorithm can effectively solve the angle measurement problem of coherent sources under composite array antennas, and its angular resolution performance is better than traditional algorithms.