基于瞬时测频的非线性调频信号脉内特征估算方法

摘要

针对瞬时自相关方法对非线性调频信号脉内分析的不适用性,提出一种基于自相关-高阶差分的脉内特征估算方法,通过多次高阶差分获得非线性调频信号的调制参数.最后对单载频信号、线性调频信号和非线性调频信号等三种典型连续调频信号进行了仿真分析.仿真结果表明,该方法在保持瞬时自相关方法性能的基础上实现了对非线性调频信号的脉内分析,具有一定的工程应用价值.%Based on the unworthiness of instantaneous self-correlation method to the in-pulse analysis of non-linear FM signal, this paper proposes an estimation method for in-pulse characteristics based on self-correlation high-order difference and obtains the modulation parameters of nonlinear FM signals by using the multiple high-order difference, and finally, performs the simulation analysis on three typical continuous FM signals of sin-gle-frequency signal, linear FM signal, and nonlinear one, and etc. Simulation results show that the proposed meth-od can be used for the in-pulse analysis of nonlinear FM signal on the basis of firming the performance of instanta-neous self-correlation method, having a certain value of engineering application.