基于多空间协同处理的非圆信号快速DOA估计

Fast DOA Estimation Algorithm of Non-Circular Sources Based on Multi-Space Joint Processing

为了降低非圆信号在雷达测向中高昂的计算复杂度,提高算法对雷达数据的实时处理能力,提出一种新颖的非圆信号波达方向(Direction of arrival,DOA)快速估计算法。区别于对接收数据在阵元空间进行处理的传统方式,上述算法首先将维度加倍的非圆信号接收数据转换到波束空间进行降维预处理;其次,通过阵元-波束空间中存在着的协方差矩阵实值分解的转换关系,构建了具有更低阶数的降阶求根多项式;最后,通过求根运算获取目标信源的DOA。计算机仿真结果表明,所提算法在精度误差可控范围之内,大幅度地降低了非圆信号测向算法的计算复杂度,提高了测向算法的速度。

In order to reduce the high computation complexity of non-circular sources in radar direction finding and improve the real-time processing ability of the algorithm for radar data, this paper proposes a novel fast direction of arrival(DOA) algorithm of non-circular sources. Unlike the traditional processing of received data in the array space, the proposed algorithm firstly converted the received data of non-circular sources with doubled dimensions into the beam space for reducing dimension. Secondly, through the transformation relationship of the real-value decomposition of the covariance matrix in the element-beam space, a reduced-order root finding polynomial was constructed. Finally, the DOAs can be obtained by rooting operation. Computer simulation results show that the proposed algorithm reduces the computational complexity within the allowable range of accuracy error, and improves the speed of the direction finding algorithms.