基于正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)信号调制特性的外辐射源雷达杂波信道状态信息估计方法,针对OFDM外辐射源雷达探测存在的问题,提出了基于信号特性的处理方法。针对该体制雷达中纯净的直达波信号获取问题,提出基于模糊函数的方法提取导频的周期信息,从而得到导频的位置信息,然后,利用导频信息得到杂波信道脉冲响应信息估计。相比常规的处理方法,文中方法能够在参考信号包含多径时得到正确的杂波信道状态信息。

A clutter channel state information estimation method for OFDM (orthogonal frequency division multiplexing) modulation-based passive bistatic radar is proposed. Firstly the concept of OFDM signal characteristics-based target detection is advocated for the detection problems in OFDM-based illuminator. Then for the training information isn't directly available for passive radar application, ambiguity function is used for OFDM Pilots period estimation, then pilot locations estimation are given. After pilot locations are known, channel impulse response information can be obtained by using the pilots' information. Compared to the conventional passive radar processing method, the proposed method can quickly realize the clutter channel state information estimation in the case of the reference signal composing multipath clutters.