利用直达波导频信号的高频外辐射源雷达接收阵列校正方法

Receiving Array Calibration Using DRM Frequency Reference Signal of Direct Wave for HF Passive Bistatic Radar

基于数字调幅广播(DRM)的特点,提出了一种利用直达波频率导频信号的高频外辐射源接收阵列幅相一致性校正新方法。首先介绍了DRM广播的信号结构,分析了其导频信号作为校正源的可行性;考虑到高频段电磁环境和传播环境的时变非平稳特性,提出了一种基于平移不变阵元偶在时间上优选直达波校正数据的方法;最后结合地波模式和天波传播模式高频外辐射源雷达实测多通道数据,比较了该方法与其他辅助定标源方法用于接收阵列校正的效果,分析结果证实了该方法的有效性。

Based on the characteristics of the digital radio mondiale （DRM）, a new method of array calibration for high-frequency passive radar （HFPBR） by using frequency reference signal of direct wave is proposed. Firstly the signal structure of DRM is introduced, while the feasibility of take fre- quency reference signal as the calibration source is demonstrated. Secondly, taking into account the e- lectromagnetic environment and time-varying non-stationary propagation characteristics, a method of choosing high quality direct wave period by the shift-invariant antenna pairs is proposed. Finally, as- sist by the known DRM transmitter position, we utilized this method deal with measured direct wave data which propagate in surface wave mode and sky wave mode, compared the result of array calibra- tion value with known single frequency signal source. The results showed that the amplitude and phase compensation method in DRM-hased HFPBR is effective.