基于随机相位调制的阵列雷达抗干扰研究

A Study on Anti-jamming of Array Radar Based on Random Phase Modulation

为提升阵列雷达抗干扰能力,利用随机相位调制增加每一阵元发射信号之间的非相关性,实现发射信号的非平面波前。从发射信号原理入手,探究随机相位调制对于探测信号与抗干扰的优势,研究阵列天线的时空相关性,建立基于随机相位调制的发射信号数学模型,用于提升探测信号的抗干扰能力。仿真实验表明:当随机调制范围达到[-π/3,π/3]时,目标与环境信号之间能够有效分辨,对于环境杂波的抑制可达到3 dB,而进一步增大调制范围则对杂波的抑制提升不明显。

In order to improve the anti-jamming ability of array radar,random phase modulation is used to increase the non correlation between the transmitted signals of each burst to realize the non plane wavefront of the transmitted signal.Starting from the principle of transmitting signal,the advantages of random phase modulation for detecting signal and anti-jamming are explored,and the spatial-temporal correlation of array antenna is studied.The mathematical model of transmitted signal based on random phase modulation is established to improve the anti-jamming ability of detection signal.Simulation results show that when the random modulation range reaches[-π/3,π/3],the target and the environment signal can be effectively distinguished,and the suppression of the ambient clutter can reach 3 dB,while the further increase of the modulation range can not significantly improve the suppression of clutter.