基于投影权优化的双基地MIMO雷达杂波抑制方法
doi: 10.3724/SP.J.1146.2013.00005
Weighted Projection Optimization for Range-dependent Clutter Suppression in Bistatic MIMO Radar
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摘要: 在正侧视双基地MIMO雷达中，所有杂波均位于由发射空间角频率、接收空间角频率和多普勒频率所构成的3维空间的同一个平面上。该文利用这一特性，提出一种基于投影权优化的双基地MIMO雷达杂波抑制方法。该方法首先对杂波谱坐标系进行旋转，使得杂波谱在新坐标系下的几何投影是距离独立的。然后以输出信干噪比(SINR)为代价函数对投影权进行优化，以提高杂波抑制性能。最后，通过将该非线性优化问题转换为一个半正定规划(SDP)问题，可以高效地对投影权进行求解。仿真结果表明该方法可以有效地消除杂波的距离依赖性，提高地面动目标检测性能。Abstract: In bistatic MIMO radar system, all the clutter ridges are located in the same plane of the three- dimensional space. By using this characteristic, a weighted projection optimization based range-dependent clutter suppression method is presented. The coordinates of the clutter spectra are first rotated through a special angle. Then the projection weights are optimized by maximizing the output Signal-Interference-Noise Ratio (SINR) to transform the 3-Dimensional (3D) range-dependent clutter to 2D range-independent. Furthermore, the resultant nonlinear optimization issue is reformulated as a Semi-Definite Programming (SDP) one, which can be solved very efficiently. Analysis of simulation indicate that the proposed method is easy to implement and can cancel the range-dependent clutter effectively.
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