A virtual instrument based integrated measurement system for Doppler navigation radar is developed. Using direct digital synthesis(DDS)technique,a kind of radar Doppler frequency simulator is introduced.

• 分析了机载四波束多普勒测速雷达的工作原理,采用直接数字频率合成(DDS)技术进行多普勒频移模拟器的设计,通过数字控制,该模拟器可以产生高分辨率的多普勒频率信号；