自然图景的天基监视雷达地杂波仿真

为了评估空-时自适应处理算法应用于天基雷达系统的效果，需要对地杂波图景进行高逼真度的仿真.首先根据特定地区的地表覆盖物数据、地形数据和雷达工作参数构建该地区的地表反射特性瞬态图景.然后根据距离重叠、地球自转效应和天基雷达的阵列模式，用反射特性图景计算杂波协方差矩阵最优值和估计值.最后根据Billingsley提出的谱模型，仿真杂波内部运动效应.仿真结果表明，所得的地表反射特性在统计意义上与实际地表反射特性差距小于5 dB，所得天基雷达杂波环境对空-时自适应算法效果影响可作定量分析.

Land Clutter Simulation of Space-Based Surveillance Radar for Natural Scene

To evaluate performance of the space-time adaptive process (STAP) algorithms for space based radar (SBR), a method for simulating clutter scenes with high fidelity is described. Instantaneous reflectivity scene of specific site is simulated first based on the corresponding land cover data, terrain data and radar operation parameters. Ideal and estimated values of clutter covariance matrix are then calculated using the instantaneous reflectivity scene, according to array pattern, effects of range foldover and earth rotation. The effect of internal clutter motion (ICM) is considered using the Billingsley spectrum model. The results show that statistical difference between simulated reflectivity scene and the reality is less than 5 dB, and simulated clutter environment of SBR can be used to analyze the performance of STAP quantitatively.