米波雷达仰角和多径衰减系数联合估计算法

 针对多径信号严重影响米波雷达低仰角测高的问题，基于广义MUSIC算法的思想，提出了一种可同时估计目标仰角和多径衰减系数的新算法。该算法利用阵列协方差矩阵和搜索角度计算出虚拟的多径衰减系数，然后将该系数与搜索角度一起构造子空间，当该子空间与噪声子空间正交时，即可获得波达方向角度，对应的系数即为多径反射波相对于直达波的多径衰减系数。该算法在克服多径效应的同时，不损失阵列孔径，不要求阵列具有特殊的结构。理论分析和仿真结果表明了该算法的优越性。

Elevation Angle and Multipath Fading Coefficient Joint Estimation Algorithm in VHF Radar

Based on general MUSIC algorithm, an elevation angle and multipath fading coefficient of the target joint estimation algorithm is proposed in VHF multipath environment. In this algorithm, a virtual multipath fading coefficient is derived from the array covariance matrix and search angles, then a subspace is formed by this coefficient and search angles. When this subspace is orthogonal to the noise subspace, DOA angles are achieved. Simultaneously, the corresponding coefficient is multipath fading coefficient. While overcoming multipath effects to elevation angle measurement, this method retains antenna aperture, and does not require a special antenna array configuration. Theoretical analysis and computer simulation results demonstrate the merits of the new algorithm.