线性调频源线性度测量的一种方法

A Method for Measuring the Linearity of the Linear FMCW Signal

线性调频连续波 (FMCW)信号的线性度是衡量线性调频源质量的一个重要指标 ,在雷达测距系统中 ,它决定着雷达的距离分辨率。介绍了一种调频信号的非线性数学模型 ,利用傅立叶谱分析理论分析了其差频信号的频谱 ,提出了一种以接收机和频谱分析仪等为主要测量设备的调频信号线性度的在线测量方法。

The linearity of the FMCW signal is an important index to appraise the frequency modulated source. It determines the radar range resolution in the system of radar range. In this paper, a nonlinear mathematical model for a FMCW signal is given. The spectrum is investigated by using of the Fourier theory. A technique for dynamically measuring the linearity is provided by meaning of the receiver and spectrum analysis equipment, etc.\;