调频线性度对chirp信号的距离分辨力影响仿真分析

Simulation and Analysis of FM Linearity Effect on Range Resolution of Chirp Signal

线性调频脉冲压缩信号(chirp信号)存在调频非线性时会导致距离分辨力下降,相位项上的噪声调制是调频非线性的主要表现形式,此时很难得到脉冲压缩后信号的解析形式,因此其距离分辨力也难于用解析形式表示出。针对这一难点,采用蒙特卡罗方法对chirp信号的这一特性进行计算机仿真分析,得出了一系列具有较高工程实用价值的结论。

FM nonlinearity can cause the range resolution degradation of LFM pulse compression signal (chirp signal). The noise modulation in the phase term is a main kind of FM nonlinearity. When FM nonlinearity exists, it is very difficult to derive the analytical form of the pulse compression result and the range resolution. Computer simulation and analysis are performed on this problem and a series of much valuable conclusions are drawn.