本文介绍了一种成功应用于某自主外测系统的多普勒模拟器的设计与实现。该模拟器易于使用，控制灵活。在系统联调期间，该模拟器可进行极小步进、快速扫频，取得了满意的多普勒模拟效果。Abstract: The article introduces the design of a kind of doppler simulator, which hassuccessfully been used in a observe and control system. The simulator is versatile andeasy to be controlled. During the system debugging period, it’s proved to be a fastswemar generator, which can implement very little frequency steps.关键词：多普勒 数字信号处理器 数字直接频率合成器Keyword: Doppler DSP DDS