以直升机雷达平台为背景,分析了机载雷达下视模式的杂波特性。首先分析了天线不同的安放角的时间-空间二维杂波谱的特性,并研究了前向阵在不同波束位置杂波的多普勒频率与斜距离的变化关系,运用了海杂波和地杂波模型计算LPRF和HPRF两种雷达工作模式下距离-多普勒杂波功率谱,最后给出了以直升机为平台的X波段雷达仿真结果,文中的杂波特性可以在系统设计时参考。

The characteristics of clutter in look-down mode for helicopter radar is presented.The space-time clutter spectra are analyzed for airborne radar with various array orientations.For forward looking radar the relation between clutter doppler and range is investigated at different beam position.With the sea clutter model and the ground clutter model used,the range-doppler power spectra from each cell are analyzed using low-PRF and high-PRF parameters.Finally,some results of the simulation using an X-band radar are given.The results can be referenced for radar system designing.

TN959