基于多普勒频率差的拖曳式诱饵干扰检测

诱饵的检测是拖曳式诱饵(TRAD)干扰对抗的基础。对单脉冲雷达有无拖曳式诱饵干扰下平衡鉴相器(BPD)输出角误差信号进行了推导,根据平衡鉴相器的原理,得出了目标和诱饵干扰信号间的多普勒频率差会影响角误差信号的结论。当不存在拖曳式诱饵干扰时,经低通滤波器处理后角误差信号无变化;当存在拖曳式诱饵干扰时,经低通滤波器处理后角误差信号交流部分被滤除,角误差信号发生变化。根据诱饵存在与否时角误差信号的这一差异,利用门限检测实现对诱饵干扰的检测。仿真分析了不同干扰场景下的检测性能,验证了本文方法的有效性。

Towed radar active decoy jamming detection based on Doppler frequency difference

The foundation of countering the towed radar active decoy (TRAD) is the presence detection of decoy.Derivation of monopulse radar angle error output of balanced phase discriminator (BPD) with and without towed radar active decoy was demonstrated.According to the principle of BPD,the conclusion can be obtained that the Doppler frequency difference between target and decoy would affect the angle error.There was no variation when the angle error passed through the low pass filter without the decoy jamming;there was a change under the condition of decoy jamming.The alternating part of the angle error was filtered out by the low pass filter.Based on the variation of angle error with and without decoy,threshold detection was used to detect the towed radar active decoy.Simulation analysis under different jamming conditions was performed on the detection performance of the proposed method,and its effectiveness was validated.