A NOVEL FFT-BASED TECHNIQUE FOR RAPID ACQUISITION OF HIGH DYNAMIC DSSS SIGNAL

摘要

High dynamic direct sequence spread spectrum (DSSS) signal acquisition process is a two-dimensional signal replication process no matter what acquisition methods are used. In this paper, acquisition methods in dynamic surroundings are researched. The analysis tells that, serial acquisition methods cannot meet the requirement of flight application, which requires correct signal capturing possibility of weak signal and less acquisition time. A new improved acquisition approach using partial correlator and Fast Fourier Transform (FFT) is introduced. The method can search Doppler and calculate C/A code phases in parallel. Matlab simulation indicate that, the FFT-based algorithm can work well in high dynamic DSSS receiver.