GPS软件接收机跟踪通道信号统计分析  

A Statistical Study on GPS Software Receiver Tracking Channel Signal

作　　者：李作虎[1] 史俊文 刘雪瑞 贾赞杰 

机构地区：[1]信息工程大学测绘学院 [2]61081部队 [3]61365部队 [4]63883部队

出　　处：《测绘科学技术学报》2010年第2期97-100,共4页Journal of Geomatics Science and Technology

基　　金：卫星导航与定位教育部重点实验室(B类)开放基金资助

摘　　要：传统的基于硬件的接收机由于芯片的封装性很难用来进行通道信号的分析研究,而基于软件无线电技术的软件接收机则很容易做到。软件接收机的跟踪通道信号统计分析可用于接收机算法的测试与比对以及卫星信号性能的分析与评估。这里搭建了GPS软件接收机L1中频数字信号处理平台,对跟踪通道输出的I、Q支路信号进行了均值、标准方差以及均方根(RMS)统计。分析了各统计值与通道对应卫星的高度角、信号强度以及噪声之间的关系。基于统计结果提出了一种估计信道信噪比的方法。最后比较了不同信号采样频率对相关三角形和导航定位解算精度的影响。Traditional receivers based on the hardware can not be used in analysis of channel signals easily because of their built-in characteristics, but software receivers based on SDR（Software Defined Radio） can do this easily. The statistical analysis of tracking channel signal with software receivers can be used in the test and compare of receiver algorithms as well as analysis and evaluation of performance of satellite signal. A GPS software receiver prototype used to process L1 intermediate frequency digital signal was designed and realized, and the I and Q outputs of tracking channels were taken statistics with the method of mean, standard variation and RMS. Then the correlation between every statistic and satellite elevation, signal power and noise power of the corresponding tracking channel was analyzed, and a method for estimating signal-to-noise ratio was given based on the analytical results. Also, the impact of different sampling frequencies on the correlation triangle and the precision of navigation and positioning was compared.

关 键 词：全球定位系统 软件接收机 跟踪 均方根 信噪比 统计 

分 类 号：P228[天文地球—大地测量学与测量工程]