混响室雷达杂波模拟器设计与仿真

Design and Simulation of Radar Clutter Emulator Using Reverberation Chamber

雷达背杂波的幅度统计特性直接影响目标探测,雷达杂波模拟器主要针对杂波时频特性进行仿真。针对大型杂波模拟器空间场分布难以控制,提出一种采用最小均方误差的遍历方法对混响室有效工作空间进行模拟控制。通过研究时谐本征模式和混沌概率分布,分析发射天线空间位置变动对混响室场统计分布特性影响。利用FEKO软件对混响室进行等比例建模仿真和电磁场计算,引入均方根误差作为实验场与标准Rayleigh场分布拟合程度优化指标,最后在混响室中设置实验对仿真结果进行验证。结果表明:在算法基础上找到了发射天线的最优位置,实现了经典Rayleigh型分布杂波在混响室空间的模拟控制,并且在优化位置处,实验与仿真结果一致。通过仿真和实验实现了混响室杂波模拟器设计,完成了Rayleigh分布雷达杂波的幅度特性模拟,为雷达设备的抗杂波干扰测试提供理论参考。

In the paper,a traversal method based on minimum root-mean-square error was proposed. Based on the harmonic eigen mode and chaotic probability distribution theory,the influence on field distribution statistical properties in reverberation chamber for antenna change in location was analyzed. We used software FEKO to build an equal proportion model and calculated the electromagnetic field in reverberation chamber. We also introduced root-mean-square error as the optimization indicator in fitting degree for simulation result and standard Rayleigh one.Then reverberation chamber experiment was set to validate the simulation result. The results show that based on the algorithm,the optimum position of transmitting antenna is found. In addition,the classical Rayleigh distribution clutter simulation control was implemented in the reverberation chamber. In optimization position,the experimental results are in agreement with simulation ones. Through simulation and experiment,the reverberation chamber designed as radar clutter emulator was realized,the amplitude characteristic of Rayleigh distribution clutter can be simulated within the chamber,which provides some theoretical reference to radar clutter interference tests.