A Fast Time Frequency Atom Method for Emitter Signals
Xian Gao · Microcomputer Information · 2010
The main problem of time frequency atom decomposition(TFAD) is its high computational complexity.This issue restricts the application of TFAD in radar emitter signal processing.This paper presents a fast TFAD algorithm based on a chaos particle swarm optimization(CPSO) algorithm.The method builds time-frequency atom dictionaries by using chirp atoms which can best match the original signal,and the initial position of the particle is evaluated by chaos.During the running time uses CPSO to reduce time complexity.Experiments conducted on radar emitter signals show the introduced method not only decreases the computational burden but also obtains time-frequency concentration of reconstructed signal,as compared to the traditional TFAD algorithms.