Galileo畸变信号相关函数的优化研究  

Optimization Study of Correlation Function for Galileo Abnormal Signal

作　　者：周霞[1] 郭承军[1] 

机构地区：[1]电子科技大学电子科学技术研究院,成都611713

出　　处：《全球定位系统》2016年第6期20-24,29,共6页Gnss World of China

摘　　要：数字电路的硬件异常会导致伽利略信号的伪码和副载波发生滞后或者超前,针对这个问题,研究了伽利略信号的伪码和副载波的下降沿同时发生超前时对伽利略信号的相关函数、功率谱以及跟踪性能的影响。结果表明,数字异常对相关函数造成很大的不良影响,甚至出现多峰和延迟现象,这会导致信号的捕获和跟踪都产生很大的误差,甚至失锁。为了克服这个问题,提出延时相减法优化相关函数,消除多峰和平顶效应,增大主峰幅度,提高了捕获跟踪性能。并在频域进行频谱分析,从实验结果可以看出这种方法处理后的信号能量更加集中,削弱旁瓣的能量。The hardware digital circuits exception cause delay or advance to pseudo-code and subcarrier of Galileo signals,for this problem,study the correlation function,power spectrum and tracking performance when the pseudo-code and subcarrier advance.The results show that the digital signal abnormalities result significant adverse effects in correlation function,and even more peaks and delays,which cause signal acquisition and tracking errors,and even loss of lock.To overcome this problem,a delay method is proposed to optimize correlation function,which can eliminate the effect of peace and multimodal,increase the peak amplitude and the acquisition and tracking performance.And in the frequency domain,power spectrum is more concentrated,and the energy petal is weaking from the experimental results can be seen after the signal energy handled in this way.

关 键 词：硬件异常 副载波 伪码 相关函数 延迟相减法 多峰 

分 类 号：P228.4[天文地球—大地测量学与测量工程]