针对当前分布式多输入多输出(MIMO)雷达目标散射模型的不足,提出了一种三维特体目标模型;在考虑点散射体电磁散射的方向性、遮蔽及收发天线方位角、俯仰角等因素的条件下,推导了目标静态雷达截面积(RCS)的计算公式和MIMO雷达信道的相关函数;同时,仿真分析了目标动态RCS的统计模型及其与收发天线双基地角的关系,以及MIMO雷达信道空间去相关的条件。仿真分析结果与RCS的经典统计模型、双基地RCS的经验结论以及单基地雷达回波信号去相关角度的经验值是吻合的,证实了模型的科学性和合理性。研究结果对分布式MIMO雷达的检测、跟踪和系统配置等研究具有参考价值。

Aiming at the inadequacy of current research on target scattering model of distributed multiple-input multiple-output (MIMO) radar, a novel three-dimension target model with special shape is established in this paper. The formula for static radar Cross-section (RCS) calculation and the correlation function of MIMO radar channels are deduced taking into consideration factors such as the electromagnetic scattering direction of point scatters, physical shielding, azimuth and pitch angle of transmitting and receiving antenna. The dynamic RCS distribution of the target and its relationship with bistatic angle between transmitting and receiving antenna are analyzed through numerical simulation. Besides, the conditions under which MIMO radar channels are uncorrelated are also analyzed. Simulation results conforms to the classical statistical models on RCS, the empirical conclusion on RCS in bistatic radar and the empirical angle on echo signal decorrelation of monostatic radar well, which verifies the proposed model. The research will provide reference for topics such as detection, tracking and system configuration in distributed MIMO radar.

TN957. 51

国家自然科学基金资助项目(61401504);中国博士后科学基金资助课题(2014M56562)