车载雷达信号接收机的数字下变频研究和实现

在车载雷达信号接收机中,由于雷达信号的中心频率远大于信号带宽,故需要通过数字下变频获取雷达的基带信号。因此,设计一种采用A/D采样芯片对雷达信号进行采样,并在FPGA中实现数字下变频的信号接收机,为满足设计要求还设计了一种基于多相滤波结构的数字下变频算法。运用Matlab对该算法进行研究和分析,并且在FPGA中进行了仿真实现,其结果表明,设计的数字下变频算法不仅能准确地得到基带信号,还可简化雷达信号接收机系统,对车载雷达信号接收机系统的进一步完善具有重要意义。

Research on and Implementation of DDC in Automotive Radar Signal Receiver

Since the center frequency of the radar signal is far greater than the signal bandwidth,automotive radar signal receiver radar's baseband signal is obtained through DDC.A signal receiver is designed with a AD chip sampling radar signal and DDC in the FPGA.A DDC algorithm is designed based on polyphase filter structure to meet the design requirements.The theoretical study and analysis of the algorithm is made through Matlab,and simulation and implementation in FPGA is performed.The results show that the designed DDC algorithm can accurately obtain the baseband signal with simpler radar signal receiver for further improvement of the radar signal receiver system.