机载雷达杂波抑制优化与性能分析

摘要

In order to analyze the clutter suppression characteristics of airborne radar and improve the detection performance of radar target in effective, the antenna transmitting direction graph models of line sub - matrix and array sub - matrix were established. At the same time, based on the space - time adaptive processing of the airborne radar clutter analysis method and according to the target oriented vector and the covariance matrix of the noise and clutter, the clutter power spectrum of the mathematical mode was established. We have simulated and analysized the clutter the characteristic value of spectrum, the improving factors, and the clutter space - time spectrum by different pulse repetition frequencies. The simulation results show that low pulse repetition frequency and moderate pulse repetition frequency make the clutter spectrum diffuse. Along with the pulse repetition frequency decrease, the correlation of clutter is less, the method of STAP is suitable for high pulse repetition frequency.%为了有效分析机载雷达杂波抑制特性和提高目标检测性能.建立了天线行子阵和列子阵的天线发射方向图模型,同时采用空时自适应处理(Space Time Adaptive Processing,STAP)的机载雷达杂波分析方法,根据目标的导向矢量和杂波与噪声的协方差矩阵建立了杂波功率谱的数学模型,选取不同的脉冲重复频率仿真分析了杂波的特征值谱和改善因子以及杂波空时谱.仿真结果表明:低脉冲重复频率和中脉冲重复频率使杂波谱扩散；随着脉冲重复频率的减少,杂波的相关度减少；STAP法适合高脉冲重复频率的情形,为抑制雷达杂波提供了依据.