LFM脉冲雷达的宽带回波多普勒频移和时延联合估计

Joint Estimation of Doppler and Time - delay of Wideband Echoes for LFM Pulse Radar

针对LFM脉冲雷达的宽带回波信号的多普勒频移和时延估计问题进行了研究。分析了发射信号与回波信号的互相关特性，对其相关函数进行了修正处理，在此基础上提出了基于修正的循环相关函数包络的多普勒尺度参数估计算法，然后构造二次项消去函数，得到回波信号的单频信号，进而得到了回波时延参数的估计。该方法能有效地估计回波信号的多普勒尺度和时延参数。最后利用计算机进行了仿真实验，验证了该算法的有效性。

In this paper, the Doppler frequency and time-delay estimators of wideband echoes for LFM pulse radar are discussed. The cross-correlation character of the transmitted signal and the wideband echoes is analyzed, the cross-correlation of them is processed, and the Doppler frequency and time-delay estimators are presented based on modified cyclic cross-correlation amplitude. Then the clean function is constructed, the single-frequency signal of the echoes can be achieved, and the time-delay can be estimated. The Doppler frequency and time-delay are estimated efficiently with this method. Finally, the character of the estimator is given through computer simulation. The resuits show this method is efficient.