基于互质阵列的近场源位置估计方法

For the problems that the number of detection signals is limited by the number of array elements and the estimation accuracy is affected by the array aperture for uniform linear array, a near-field source location estimation method based on coprime arrays is proposed. In the proposed method, the received data of the coprime array is preprocessed, and a model that contains only angle parameter is established. The angle offset vector and power vector are modified gradually by iterative method to obtain the final DOA of incident signal. An off-grid model about the distance parameter is established by fixing the estimated angle. The distance estimation value is obtained by iteratively modifying the distance offset vector gradually. The proposed method was verified by simulation test. Theoretically analyzed and simulated results show that the proposed method is used to expand the array aperture effectively improve the estimation accuracies of angle and distance, and still has good estimation performance in the case of low signal-to-noise ratio and small snapshots. At the same time, the estimated angle and distance are automatically matched to determine the location of near-field source.