关键词: 直扩系统, pn码捕获, FFT频谱分析

Abstract:

Spread spectrum communication is a system of expanding the baseband signal spectrum to wide band and transmitting.Rapid acquisition of pn code is a key baseband technology of Straight extender system.This paper achieves the spectrum analysis on multiple input signals,doppler frequency detection of carrier and pn code synchronous position search by adopting a parallel FFT algorithm based on the maximum likelihood estimation,and finally gives Matlab simulation and RTL circuit diagrams.This algorithm has been put into practical use in engineering and shows good effect in improving multi-channel spread spectrum signal and receiving system capture time.

Key words: straight extender system;pn code acquisition;FFT spectrum analysis