复杂阵地米波雷达低仰角测高算法研究

针对复杂阵地下的米波雷达低仰角测高问题,建立多径信号服从高斯分布源的阵列信号模型,提出一种基于多维交替投影的合成导向矢量最大似然算法。该方法将回波信号的相关矩阵,在各个模型参数中交替投影,该方法可以同时对直达波角度和多径信号分布源参数进行精确的估计,并可以有效地对低仰角低空目标进行高度测量。与现有的测高算法相比,该方法在复杂阵地下能有效进行目标高度估计。计算机仿真结果和实测数据处理结果证实了该算法的可行性。

Study on Low-Angle Height-Finding Algorithm of VHF Radar in Complex Terrain

Owing to the problem of low-angle height-finding of VHF radar in complex terrain,a new signal model is built,in which the multi-path signals obey Gaussian distribution sources,and a synthesized vector maximum likelihood algorithm using multi-dimension alternating proj ection is proposed in this paper. By proj ecting the correlation matrix of the target echo into different model parameters,this method can be used to estimate accurately both of the direction of direct wave and the parameters of the multi-path distribu-ted sources,and hence the altitude of the target is known precisely.Compared with traditional high-resolu-tion methods,the proposed method achieves higher resolution under complex reflection surface.Simulation results and the real data processing demonstrate the validity and feasibility of the proposed approach.