一种高效多模式雷达数字下变频的设计

针对雷达系统不同带宽工作模式共用同一个信号接收前端的应用需求，提出一种可以适应多种带宽要求的高效数字下变频设计。混频器的设计采用了采样率等于四倍中频的采样技术，滤波器采用了并行抽取滤波与多级滤波相结合的设计方法。根据雷达不同工作模式对滤波器的性能需求，设计了一种能适应不同带宽数字信号滤波要求的滤波器结构。基于Xilinx FPGA设计平台，完成了具有三种工作模式的DDC设计实例，并通过实验数据分析，验证了设计方法的正确性。

An Efficient Design for Multi-modes Radar Digital Down Conversion

Aiming at the application requirements of the same signal receiving front-end in different bandwidth operating modes of radar system, an efficient DDC design for multiple bandwidths was presented. The mixer is designed with a quadruple IF sampling technology, and the filter was designed with a parallel decimation and multi-level filtering. The structure of filter was designed for different bandwidth digital signal filtering according to performance of radar in different operating modes. The DDC design example with three operating modes was presented based on the Xilinx FPGA design platform, and the reasonability of the design method was verified through experimental data analysis.