侦察雷达天线扫描周期对抗估计方法

Method for the estimation of the scanning cycle for countering the reconnaissance radar

针对传统侦察雷达天线扫描周期估计方法精度不足的问题,提出一种基于单架旋翼无人机对多普勒雷达天线扫描周期精确估计的新方法.通过对无人机所接收雷达脉冲信号的处理,采用范数逼近的方式,分别用拟合平均法和平均拟合法在接收端有效地重构出雷达天线的主瓣波束方向图,并以此为基础精确估计目标雷达天线的扫描周期参数.仿真实验以实战雷达作为目标源,验证了所提方法的有效性和鲁棒性.结果表明,当接收信噪比较高时,平均拟合法可更好地接近甚至达到克拉美罗下界性能.

This paper focuses on the problem of accurately estimate the scanning cycle of the reconnaissance radar by using the single one Unmanned Aerial Vehicle（UAV）.The Main-Bean Pattern（MBP）of the radar antenna is reconstructed effectively according to the received radar pulses signals based on the norm approximation algorithm.For the traditional Pulse Doppler（PD）radar,the fitting then average method and average then fitting method are proposed to approximate the MBP of the radar antenna.The obtained MBP curve can be utilized to accurately estimate the scanning cycle of the reconnaissance radar.In the simulation section,the validity and the robustness of the proposed methods are verified through the performance comparison.The results indicate that when the receiving signal-noise-ratio（SNR）is high,the average then fitting method can be better close to or even reach Cramer-Rao Lower Bound（CRLB）performance.