基于低轨星载正六边形阵的和差测向算法

Sum and difference direction finding algorithm based on low orbit spaceborne regular hexagonal array

针对低轨星载正六边形阵的二维波达角(Direction Of Arrival,DOA)估计问题,文中提出了一种基于直接加权法及空间几何原理的降维和差测向算法,该算法分为两个步骤,利用分段处理的直接加权法进行两次一维和差测向,得到非十字交叉的两个方向的两个方位角;利用误差校正处理的降维解算模型得到所求平面阵的方位角及俯仰角。仿真结果表明,在大于-10 dB的低信噪比环境中,方位角鉴角误差稳定,不超过1.2°,俯仰角鉴角误差稳定,不超过0.8°,可以有效实现DOA估计。

Aiming at the problem of the two⁃dimensional Direction Of Arrival(DOA)estimation problem of the low⁃orbit spaceborne regular hexagonal array,this paper proposes a dimensionality reduction and difference direction finding algorithm based on the direct weighting method and the principle of space geometry.The algorithm is divided into In two steps,first use the direct weighting method of subsection processing to perform two one⁃dimensional and difference direction finding to obtain the two azimuth angles of the two non⁃cross directions,the azimuth and elevation angles of the plane array are obtained by using the dimensionality reduction solution model of error correction processing.The simulation results show that in a low signal⁃to⁃noise ratio environment greater than-10 dB,the azimuth angle discrimination error is stable not more than 1.2°,and the pitch angle discrimination error is stable not more than 0.8°,which can effectively realize DOA estimation.