In this paper,the charaeteristic of the signal is introduced,and the producing process is analysed,then a method of software demodulation and FFT is brought forward.

• 介绍了离轴驱动信号的特征,分析和分解其形成过程,提出一种软件解调和傅立叶变换相结合的测试方法,并在某航空产品测试设备中得到应用。