投散射式伪杂波分辨单元面积计算及其仿真应用

Area Calculation of the Scattered Fake Clutter Resolution Cell and Its Simulation Application

针对空时自适应处理(STAP)的投散射式伪杂波干扰克服了传统干扰方法的单维性,现有文献中基于干噪比(JNR)来仿真伪杂波,由于未能反映干扰功率的真实分布而不能准确反映伪杂波干扰效果。为了更准确的评估干扰效果,本文提出了一种计算伪杂波分辨单元面积的方法。根据伪杂波干扰模型,建立合适坐标系,通过坐标变换推导了伪杂波地面等距离椭圆环的解析表达式,给出了分辨单元面积的积分表达式。根据分辨单元面积计算出各伪杂波块散射的干扰功率,结合投散射干扰的空时特性对伪杂波进行仿真。通过仿真实验对比了两种方法生成的伪杂波的功率分布、功率谱和干扰效果。仿真结果表明基于分辨单元面积生成的伪杂波更符合实际,能更准确地评估伪杂波干扰效果。

Scattered fake clutter jamming against space-time adaptive processing(STAP)overcame dimensional unicity of traditional jamming methods.In the existing literature,fake clutter simulated based on Jamming-to-Noise Ratio(JNR)cannot accurately reflect the effect of fake clutter jamming because it fails to reflect the real distribution of jamming power.To evaluate the effect of fake clutter jamming more accurately,a method for calculating the area of fake clutter resolution cell is proposed.The analytic expression of the fake clutter ground equidistant ring is derived using coordinate transformation.The integral expressions of the area of resolution cells are given.According to the area of the resolution cells,the scattering power of each fake clutter patch can be calculated,and the fake clutter can be simulated by combining the space-time characteristics of the scattered jamming.The power distribution,spectrum,and jamming effect of the fake clutter generated by the two methods are compared through simulation experiments.The simulation results show that the fake clutter generated based on the area of the resolution cell is more practical and can evaluate the fake clutter effect more accurately.