改进时域对消算法抗主瓣恒模干扰研究

针对常规的时域对消法在抑制主瓣恒模干扰信号时，脉压峰值损失6 dB且目标位置处仍有残余干扰的问题，提出了一种改进的时域对消处理方法。本文首先通过推导对消后剩余信号的具体表达式，接着给出一种时变匹配滤波器形式，提出了基于时变滤波处理的脉压信噪比补偿算法。然后为了提取被对消后残余干扰淹没的小目标，给出了一种在主目标位置处再次对消残余干扰的干扰抑制方法，使得小目标能够被检测。最后给出了改进时域对消算法流程。计算机仿真说明了该方法的有效性。

Modified Time-Domain Cancellation Algorithm for Constant-Modulus Jamming Suppression

When traditional time-domain cancellation algorithm is used to suppress constant modulus mainlobe interference, there will be a 6 dB peak loss after pulse compression and residual interference remaining in the signal after cancellation. Aiming at this problem, a modified time-domain cancellation algorithm is thus proposed. In this paper, a form of time-varying matched filter is given by first deriving the specific expression of the residual signal after cancellation. Therefore, an SNR compensation algorithm is proposed on the base of time-varying filtering. Then, in order to detect and extract the small target submerged by the residual interference, a method of suppressing residual interference at the target position is given. Finally, the process of the modified time-domain cancellation algorithm is given. Computer simulation results show the effectiveness of the method.