在传统测向方法中，测向精度正比于阵列孔径，因此布阵空间与测向精度的矛盾性成为电子侦察系统在无人机等平台应用的主要工程约束之一。为实现空间受限下的高精度测向，提出一种通过协方差矩阵重构阵列接收数据的波达方向(Direction of Arrival，DOA)方法。结合均匀线阵的结构特点以及导向矢量 Vandermonde矩阵与协方差Toeplitz矩阵的矩阵特征，通过重构阵列数据接收模型，实现阵列孔径的拓展，可在布阵空间不变的条件下显著提升阵列的测向精度。仿真结果表明，这种基于协方差数据重构的DOA方法实用有效，可作为传统DOA技术的前处理手段，提升算法性能及处理增益。
A Method of DOA Estimation Based on Rebuilded Data Rebulding
In traditional direction finding methods,the direction finding accuracy is proportional to the array aperture,so the contra-diction between array aperture and Direction of Arrival(DOA)accuracy becomes one of the main engineering constraints for the appli-cation of electronic reconnaissance system in UAV and other platforms.In order achieve high DOA precision under space limitation,this paper presents a method of DOA estimation based on array receiving data rebuilded by covariance matrix.Combined with the array structure and the character of Vandermonde and Toeplitz matrix characteristics,the array aperture is expanded by reconstructing the ar-ray data receiving model,and the DOA accuracy of the array can be significantly improved under the condition of constant array space.Computer simulation results show that the presented DOA estimation method is practical and effective,which could also be used as an efficacious pretreatment method for traditional DOA technology to improve performance and processing gain of DOA Algorithm.
国家科技期刊平台
NSTL
万方数据
