距离门信号级的机载双基雷达地杂波模拟方法

由于几何配置的多样性,双基雷达地杂波模拟比较复杂.虽然单基雷达杂波散射元划分的方法可用于双基地杂波仿真,但不利于特定距离门信号的分析.在比较了单双基地雷达地面散射元等距线的基础上,提出一种距离门信号级的机载双基雷达地杂波模拟方法,距离向以双程斜距分辨率划分椭圆环,推导出地面椭圆表达式和散射元坐标解析解,方位向引入椭圆中间参量,在保证多普勒分辨率基础上划分杂波元网格,给出杂波模拟中未知参量的计算.该方法不仅能进行所有观测区域杂波功率谱的仿真,且可完成某些或某个距离门杂波回波信号的计算分析,实现距离门信号级杂波的模拟.仿真结果验证了该方法的有效性.

Method of ground clutter simulation in range gate signal level for airborne bistatic radar

Ground clutter simulation of bistatic radar is complex due to the variety of geometry configuration. The method of clutter scatterer division in monostatic radar can be applied to bistatic radar, while it is inconvenient for clutter analysis in specific range gates. One clutter simulation approach in range gate signal lever for airborne bistatic was proposed based on the comparison between ground equidistance traces of bistatic and monostatic radar. The equidistance ellipse rings were divided with two-way distance resolution in range direction, the expression of ground ellipse was deduced, and the analytic resolutions of scatterers were presented. In azimuth direction the clutter cell grids were dispersed by introducing intermediate variable guaranteeing the Doppler resolution, and the computing processes of unknown parameters used in clutter simulation were presented. The approach can complete not only the simulation of clutter spectrum for overall area observed, but also the computation of the clutter echoes in one or some special range gates. Simulation results prove the validity of the method.