基于DDS幅相调制的多点目标回波模拟技术

摘要

A multi-target radar echo simulator is designed based on a Direct Digital Frequency Synthesis (DDS) device AD9910. The characteristics of Linear Frequency Modulation(LFM)multi-target echo signal are discussed. In combination with the function of AD9910,a method of producing LFM signal by using DDS frequency sweep mode is proposed,and the ampli-tude and phase modulation information is input through DDS parallel data port to simulate producing the multi-target LFM echo signal. The effectiveness of the method is verified by analyzing the simulation and experimental data. The design is simple,the signal quality is good. The multi-target simulation can be realized without adding extra hardwares. The design provides an impor-tant application value in radar system debugging.%基于单片DDS器件AD9910，设计并实现了多目标雷达回波模拟器。讨论了LFM多目标回波信号的特征，并结合AD9910器件功能，提出了采用DDS频率扫描模式产生LFM信号，同时通过DDS并行数据端口输入幅相调制信息，模拟产生多目标LFM回波。经过对仿真和实测数据的分析，验证了方法的有效性。所提方法设计简单，信号质量良好，不增加额外硬件即可实现多点目标模拟功能，在雷达系统调试方面具有重要的应用价值。