高动态低信噪比下扩频信号捕获算法研究

摘要

The impact factor about acquisition of spread spectrum signal in high dynamic is analyzed.A fast acquisition method based on double acquisition is presented especially for the strict demand on acquisition time in low-SNR and high dynamic.It can shorten the capture time and get PN-code phase,carrier Doppler frequency and carrier Doppler frequency change rate.%分析了高动态对扩频信号捕获的影响因素,针对低信噪比、高动态的双重条件对捕获时间的严格要求,提出了一种基于二次捕获的高动态低信噪比下扩频信号快速捕获方法,能够缩短捕获时间,快速进行扩频伪码相位、载波多普勒频率以及载波多普勒频率变化率的捕获.