大扩展比参差MTI滤波器设计

在雷达信号处理中 ,参差滤波是延展速度盲区、剔除零频噪声的一种重要信号处理手段 ,在目前的许多重要型号的型号雷达中都有应用。通常限制最大参差比在 1 5与 2 0 ,码核在N到 3N之间。如果超出这个范围则称对应的参差MTI滤波器为大扩展比参差滤波器。目前参差滤波器设计中经常使用的极零点法、改善因子最大法以及频域干涉法的原理不能很好地用于大扩展比情况。以某重点型号雷达的系统设计参数为背景 ,在Matlab仿真开发环境下对其性能进行了比较。在此基础上提出了大扩展比情况下设计参差滤波器的可行方法———护展杂波区法。仿真结果显示该方法灵活、有效。

Design of Non-Uniform-PRF MTI Filter With Large Extension Ratio

In radar signal proccssing, non-uniform-PRF MTI filter is an important means to extend radar velocity blind zone and to eliminate zero frequency noise, which has been widely used in many key radar projects. Usually the maximum non-uniform ratio is limited between 1.5 and 2.0, and the code kernel between N and 3N. If the value is out of range, we call the corresponding filter a targe extensio ration non-uniform MTI filter. The well-known pole-zero method, improvement factor maximization method and frequency domain interference method can not well deal with the case of large extension ratio. With the parameters of some important radar systems as the reference, under the Matlab simulation and development environment, this paper, analyzes the commonly used methods in non-uniform-PRF MTI filter design, and gives a new method-extending clutter region method. On this basis, the paper propses a non-uniform-PRF MTI filter with large extension ratio. The simulation results have veritied the effectiveness of the solution.