基于信道多普勒特征的外辐射源雷达杂波抑制方法

利用数字广播信号的正交频分复用(orthogonal frequency division multiplex, OFDM)调制特性,提出一种基于信道多普勒特征的外辐射源雷达杂波抑制方法。首先,在子载波域获取每个OFDM符号的频域信道响应值,然后将该信道响应值变换到时域,并在时域利用信道多普勒特征构造杂波子空间项,用于抑制零频和非零频杂波。所提方法杂波子空间构造与发射信号无关,可离线生成,简化了信号处理流程,降低了计算复杂度。仿真和实测数据均验证了所提方法的有效性。

Clutter suppression method for passive radar based on channel Doppler characteristic

A clutter suppression method of the passive radar based on channel Doppler characteristic is proposed utilizing the orthogonal frequency division multiplex (OFDM) modulation characteristic of the digital broadcasting signal. The proposed method first obtains the frequency domain channel response of each OFDM symbol in the subcarrier domain. Then the channel response is transformed into time domain. The clutter subspace term is constructed by the channel Doppler feature in the time domain, which is used to suppress the zero-frequency and non-zero-frequency clutter. The constructed clutter subspace in the proposed method is independent of the transmitted signal and can be generated offline, which simplifies the signal processing and reduces the computational complexity. The validity of the proposed method is verified by the simulation and measured data.