基于虚拟仪器技术的雷达信号模拟器设计

Design of Radar Echo Simulator Based on Virtual Instrument Technology

为了解决采用DSP技术的雷达模拟器的硬件外围电路设计复杂、人机交互界面设计繁琐的问题,利用FPGA芯片控制能力强,设计灵活以及LabVIEW语言易于实现人机交互界面设计等优点,采用计算机结合NI公司的PCI-5640R数据收发中频卡,设计了雷达回波模拟器。利用Matlab仿真出线性调频、杂波、干扰等信号数据后,通过PCI总线把它们写入板卡的FPGA中,由FPGA控制时序,经D/A转换后将数据送出,从而实现雷达回波信号的模拟。实验结果表明,该模拟器具有良好的通用性和精确度,并且结构简单,使用灵活。该设计形式对于今后雷达信号模拟器模块化设计具有借鉴意义。

The periphery circuit of the radar echo simulator based on the DSP technology is very complex, and the design of the interface between person and computer is fussy. While the FPGA chip has good control capability, and the LabVIEW language can complete the design of the interface between person and computer easily, for which a radar echo simulator based on the PCI-S640R intermediate frequency card of NI corporation was designed. The radar echo signal simulation is achieved after simulating the linear frequency modulation, clutter, disturbing signal and so on through Matlab, then placing the data in FPGA through the PCI bus, controlling the time sequence by FPGA and sending out the data by AD9857. The results show that the simulator has good universality and accuracy, and can be operated reliably. It is full of meaning to modularize the radar echo simulator.