单脉冲雷达低仰角测量的C^2算法研究  

C^2 algorithm used in low-altitude target elevation measurement with monopulse radar

作　　者：祝一薇[1] 楼生强[1] 王展[1] 辛勤[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《电光与控制》2008年第11期36-40,共5页Electronics Optics & Control

基　　金：武器装备预研基金项目(9140A20010107KG01)

摘　　要：由于多径反射信号的干扰,低仰角测量成为一个难点。C2算法用于低仰角测量具有计算量小、算法稳定、测量精度高的优点。依据多径反射的4路回波信号模型(直接-直接、直接-反射、反射-直接、反射-反射),推导出了C2算法的估计量解析表达式,给出了详细的物理解释,并对每个估计量的抗多径干扰性能进行理论分析。仿真分析了算法估计量在多径干扰强弱不同的场景下估计性能优劣的变化情况,给出详细数据。提出了根据在多径干扰大的场景下重新选择优势估计量B(舍弃劣势估计量C)进行目标仰角估计的应用方法。试验结果表明,这种改进的应用方法在多径干扰大或通道噪声低的情况下可以明显减小C2算法的测量误差。Low-altitude target elevation measurement is a difficult problem due to the interference of multipath reflection signal. C^2 algorithm has the advantages of small calculation cost, stable algorithm and high measurement accuracy when used in measurement of elevation. According to the return signal models of multipath reflection （direct-direct, direct-reflection, reflection-direct, reflection-reflection）, expressions of the estimators in C^2 algorithm are derived, and detailed explanation is offered. The performance of each estimator against the muhipath interference is discussed. Simulation is made on the performance when the application settings are changed and the datum is offered. It is put forward that when the multipath interference becomes severe, the superiority estimator B should be reselected for estimating the elevation of the target reject the inferior estimator C. Experiment result showed that the improved method can obviously decrease the measurement error of C^2 algorithm under strong multipath interference.

关 键 词：单脉冲雷达 低空目标 仰角测量 C^2算法 估计量 多径干扰 仿真 

分 类 号：V443.2[航空宇航科学与技术—飞行器设计]