一种极化分集制导雷达及低截获概率信号设计

A kind of guidance radar with polarization diversity and its signal design for low probability of intercept

研究了一种基于极化分集阵列的主动式弹载相控阵雷达及其信号设计问题。阐述了该制导雷达极化分集阵列的设计思想和雷达系统结构;设计的雷达发射信号为:在脉冲内部采用线性调频或者相位编码脉冲压缩信号、在脉冲组之间采用时域波形和极化状态的同时捷变,采用脉冲压缩技术以实现高距离分辨率和探测距离,综合采用脉冲压缩技术和极化编码技术有效提高雷达的低截获概率性能,采用极化估值与检测技术提高雷达的抗干扰能力。建立了双极化发射信号的数学模型,论述了双极化回波信号的处理方法,仿真分析了其抗干扰性能。研究结果表明,该新体制制导雷达具有良好的抗移频干扰和延时干扰的能力,电子战性能更为优良。

A kind of active guidance radar based on the phased array with polarization diversity and its signal design problem is studied. The design idea of antenna array with polarization diversity and the radar system structure are introduced. For the designed radar transmitted signal, the linear frequency modulation （LFM） signal or the phase coded signal is adopted and the time domain waveform and polarization states can be changed simultaneously among pulse groups. The pulse compression technique is used to improve the detection range and range resolution, the pulse compression and orthogonal polarization coded technique are combined in order to improve the low probability of interception （LPI） performance effectively, and the polarization estimation and detection technique are adopted to improve the anti-jamming ability. The mathematical model of dual polarization transmitted signal is formulated, the processing method of dual polarization echo signal is discussed and the anti-jamming ability is simulated. The research results reveal that the novel guidance radar system has strong ability to suppress the frequency shift interference and time delay interference, so it has good performances in modern electronic warfare.