双基地宽带成像雷达时间及调频率同步方法

Time and chirp rate synchronization method of bistatic wideband imaging radar

双基地宽带成像雷达由于不同源会产生时间同步误差和调频率同步误差。针对这一问题,面向低成本、小型化雷达接收机设计同步方法。针对时间同步问题,提出了直达波触发的收发脉宽非一致时间同步方案,通过使用直达波触发接收窗启用时刻,同时增加接收窗长度和低通匹配滤波,以完成时间同步。针对调频率同步问题,提出了采用吕氏分布对调频率误差进行估计,进而进行补偿,以完成调频率同步。该时间及调频率同步方法基本不需要增加接收机硬件成本,可以适应小型化接收雷达需求。基于小型宽带雷达搭建室内的双基宽带雷达模型,实验实现了双基雷达同步以及数据采集、成像。实验结果验证了所提方法的有效性。

Bistatic wideband imaging radar generates time synchronization errors and chirp rate errors due to different sources.To address this issue,for low-cost and miniaturized radar receivers,synchronization methods are designed.To solve the time synchronization problem,the nonuniformity time synchronization scheme with transmitting and receiving pulse width triggered by direct wave is proposed,which is using direct-wave-to trigger receive window enable moments,while increasing the receive window length and low-pass matching filtering to complete the time synchronization.To solve the chirp rate synchronization problem,it is proposed to estimate the chirp rate frequency error using Lv’s distribution,and to further compensate it to complete the chirp rate synchronization.The time and chirp synchronization method basically does not need to increase the receiver hardware cost and can be adapted to the miniaturized receiving radar’s requirements.Based on the small wideband radar to build indoor bistatic wideband radar model,the experimental validation is conducted to realize the bistatic radar synchronization as well as data acquisition and imaging.The experimental results verify the effectiveness of the proposed method.