基于北斗空基伪卫星信号的低空飞行目标检测技术

Research on Low-flying Target Detection Based on Beidou Space-based Pseudolite Signal

北斗区域卫星导航系统已经建成和投入运行,扩展和丰富北斗卫星导航系统在不同领域的应用成为一项重要任务。针对战场环境下重点目标面临的低空突防威胁,提出了一种用于低空目标检测的基于北斗伪卫星信号的双基地雷达系统模型,给出了系统的信号处理流程、功率预算和检测概率分析过程。为了有效地从接收信号中提取目标信号,提出了一种基于最小方差的信号处理算法,并通过ECA(Effective Cancelation Algorithm)算法衰减参考信号泄漏,通过二维网格平均CFAR方法提取目标信号。仿真结果表明,该系统模型可以有效地对低空目标进行检测。

Beidou regional satellite navigation system has been built and put into running,and the application expanding of Beidou satellite navigation system in various fields becomes an important misslon.In view of low altitude penetration threat on important targets, this paper proposes a bistatic radar system model based on Beidou pseudo satellite signal to implement low altitude target detection,and presents the signal processing, power budget and detection probability analysis process. In order to extract the target reflection signal effectively, a signal processing algorithm based on LS is proposed.The reference signal is attenuated by ECA method, and the two-dimen- sion cellular averaging CFAR algorithm is used to extract the target signal.The simulation results show that the proposed system model can detect the low-flying targets effectively.