Receiver Acquisition Algorithms and Their Comparisons for BOC Modulated Satellite Navigation Signal
Receiver Acquisition Algorithms and Their Comparisons for BOC Modulated Satellite Navigation Signal
复制标题
DOI：
10.1109/csnt.2012.132
复制
发表时间：
2012-05
期刊：
影响因子：
--
通讯作者：
P. Thakar;H. Mewada
中科院分区：
文献类型：
--
作者：
P. Thakar;H. Mewada
目前，以GPS为代表的卫星导航系统在世界范围内得到了广泛的应用，各种应用都在快速发展，这就产生了对卫星导航的需求。随着区域卫星导航系统的发展，与GPS频率相近的卫星导航系统对GPS信号产生干扰。在进入的卫星导航系统中使用二进制偏移载波(BOC)调制信号可以减少这种干扰，因为它在载波频率具有较低的PSD。在卫星导航系统的接收机中，第一个主要部分是捕获，它给出码相位和频率的粗略取值，使发射和接收机码对齐，从而得到数据，是卫星导航接收机中非常重要的部分。目前，类GPS信号的码相和频率捕获算法主要有串行码搜索或时域捕获算法、并行码相搜索或基于FFT的捕获算法、并行频域搜索捕获算法等。同样的算法也适用于BOC调制的卫星导航信号，只需对它们进行微小的修改。为了克服并行频域搜索捕获的缺点，文中给出了平方捕获算法。本文针对BOC调制的卫星导航信号，用MatLab对这些算法进行了实现和仿真，并对它们进行了比较。
Now days, the satellite navigation system such as GPS is used world widely for many applications which are growing fast creating need of satellite navigation. Regional satellite navigation systems are growing now which uses similar frequency as GPS so it creates the interference to GPS signal. The use of the Binary Offset Carrier (BOC) modulated signal in incoming satellite navigation systems can reduce this interference as it has low PSD at carrier frequency. In the receiver for satellite navigation system, the first main part is the acquisition which gives the coarse value of code phase and frequency to make the transmitter and receiver code align so to get data back so it is very important part of the satellite navigation receiver. The popular algorithms of the code phase and frequency acquisition for GPS like signals are serial search or time domain acquisition algorithm, parallel code phase search or FFT based algorithm, parallel frequency space search acquisition. The same algorithms can work for the BOC modulated satellite navigation signal by making a small change in them. Also to overcome the drawback of the parallel frequency space search acquisition, as a solution the squaring acquisition algorithm is described in this paper. In this paper, these algorithms are implemented and simulated by us in MATLAB for the BOC modulated satellite navigation signal and they are compared.