基于时频分析的线性调频信号检测

Detection of LFM signals based on time-frequency analysis

目前经典信号处理技术即时域和频域分析方法,已不能满足信号检测的需要,时频联合的分析方法逐渐成为分析很多信号的强有力工具,尤其是处理频谱随时间变化的非平稳信号,例如处理线性调频信号(LFM)。本文对LFM信号的时域特性和时频联合特性进行比较,将模糊度函数分析方法引入到非平稳信号分析中来,并通过对实际雷达信号的检测,来说明LFM信号采用时频分析的优越性。

The classical signal processing methods such as time-domain analysis and frequency-domain analysis possess disadvantages in dealing with signals. In contrast, the joint time-frequency signal representation is a powerful tool for analyzing a variety of signals, especially when time-varying non-stationary signals like LFM signals are processed. This paper introduces ambiguity function analysis method into non-stationary signal analysis and compares the time-domain analysis with joint time-frequency analysis on LFM signals. By measuring the actual radar signal, the superiorities of time-frequency analysis on LFM signals are indicated.