机载双基地雷达空时二维杂波建模与特性分析

Modeling and Characteristics Analysis of Two-Dimensional Space-Time Clutter for Airborne Bistatic Radar

为分析机载双基雷达分布与双基构型的关系,通过建立双基地机载雷达几何模型并推导双基杂波等距离环的解析表达式,采用以双基距离和以及杂波点相对于等距离环中心的方位角为变量的建模方法,精确描述出了在任意双基构型下接收杂波多普勒频率的计算公式。仿真结果表明,多普勒频率随着双基距离和的降低,杂波距离相关性变强;而随着基线长度的减小,杂波的距离依赖性减弱。因此,可通过合理配置双基构型参数降低杂波距离依赖性,为双基杂波的抑制提供理论基础。

In order to analyse the relationship between the space-time distribution characteristics of clutter under the airborne bistatic radar system and the bistatic configuration,the geometric model of bistatic airborne radar is established,and the analytical expression of clutter isorange contours is derived.Then,a modeling method based on the variables of bistatic range sum and azimuth angle of clutter point relative to the center of the clutter isorange contours is presented to accurately calculate the Doppler frequency of clutter in any bistatic configuration.Simulation results show that the correlation of clutter range becomes stronger with the decrease of the bistatic range sum.However,with the decrease of bistatic baseline,the range dependence of clutter is relatively reduced.Therefore,the range dependence of clutter can be reduced by rationally configuring the bistatic parameters,which provides a theoretical basis for the suppression of bistatic clutter.