【摘要】 针对当调频(FM)干扰超出伪码调相连续波雷达自身抗干扰容限时相关输出严重恶化的问题,提出了一种基于S-method的FM干扰抑制方法。该方法首先计算回波信号的S-method分布,估计干扰信号的瞬时频率及瞬时相位,并通过迭代校正方法提高相位估计精度,基于最终的估计相位,构造干扰对消器实现干扰抑制。对正弦调频和线性调频干扰抑制前后的相关输出进行了仿真分析。结果表明,在信干比(SJR)分别为-20 dB和-25 dB的条件下,该方法能够有效抑制干扰,实现目标正常检测。更多还原

【Abstract】 In view of the problem that the correlation output deteriorates greatly when the frequency modulation(FM)interference power exceeds the anti-jamming limitation of the pseudo random code continuous wave(PRC-CW)radar,a method is proposed based on S-method for FM interference suppression.The method computes the S-method distribution of the echo signal and instantaneous frequency and instantaneous phase of the interference.The calculation accuracy of the phase is improved by iterative correction.The interference canceller is constructed to implement interference suppression according to the final phase estimation.The correlation outputs under sine FM and linear FM interferences cases are simulated with SJR-20 dB and-25 dB respectively.The results show that the method can effectively suppress the FM interference and implement target detection.更多还原