频域叠加的大频偏导航信号捕获算法  

A large frequency shift navigation signal acquisition algorithm based on the folding technique in frequency domain

作　　者：张纪超[1] 张旭东[1] 

机构地区：[1]电子科技大学电子科学技术研究院,成都611731

出　　处：《测绘科学》2015年第4期101-105,共5页Science of Surveying and Mapping

摘　　要：在卫星导航接收机的设计和实现过程中,信号捕获是卫星信号同步的关键步骤。只有捕获到了正确的相位和多普勒信息,才能初始化跟踪环路,进而完成信号的同步。针对高动态接收机在大频偏条件下实现信号捕获需要进行多次频域搜索,计算量成倍增加的问题,该文以GPS系统为例,分析了多普勒频偏对相关峰的影响,利用频域叠加技术设计了在多普勒频移过大条件下的信号捕获方案。分析结果表明,该捕获方案可以完成大频偏下的信号捕获,降低了多次频域搜索带来的计算量,并且具有较好的捕获性能。In the satellite navigation receiver design and implementation process,signal acquisition is a key step in the satellite signal synchronization.Only capturing the correct phase and Doppler information,can the tracking loop be initialized,and then complete the signal synchronization.In this paper,the GPS system was exampled to analyze the influence of the Doppler frequency offset to the correlation peak,then a signal acquisition scheme was designed under the conditions of large Doppler shift.Theoretical analysis and simulation results showed that the capture scheme could be completed under large frequency shift,reducing computation brought by repeatedly search in frequency domain,and had a better acquisition performance.

关 键 词：卫星导航 信号捕获 频域叠加 多普勒频偏 

分 类 号：P228[天文地球—大地测量学与测量工程] TN96[天文地球—测绘科学与技术]