Robust beam forming method based on auxiliary array elements

The invention provides a robust beam forming method based on an auxiliary array element, and the method comprises the steps: introducing a small number of accurately corrected auxiliary array elements into an original array with an array element position disturbance error, and achieving the decoupling processing of an array element position error parameter and a signal incoming wave direction through a subspace thought. Therefore, a more accurate expected signal steering vector and an array flow pattern are obtained, a noise power value is estimated by using a sampling covariance matrix characteristic decomposition method, and then reconstruction of an interference and noise covariance matrix is realized with low complexity based on a signal subspace fitting method. According to the method, the problem of expected signal self-cancellation can be effectively relieved, the beam forming robustness when error mismatch exists is effectively improved, and the phenomenon that the performance of a beam former is degraded due to array errors is effectively reduced; the method can effectively solve the problem of expected signal self-cancellation of a traditional robust beam forming method, is excellent in performance in an application scene with a high input signal-to-noise ratio, and effectively reduces the calculation complexity of interference and noise covariance matrix reconstruction.