【作者】 张鑫； 崔晓伟； 冯振明；

【Author】 Zhang Xin,Cui Xiaowei,Feng Zhenming Department of Electronic Engineering,Tsinghua University,Beijing,China

【机构】 清华大学电子工程系；

【摘要】 GNSS软件接收机的平台搭建已成为导航领域的研究热点之一。由于软件与硬件的工作方式不同,硬件平台中的接收机架构不能直接应用于软件接收机。针对不同的应用需求,目前已有各种类型的软件接收机。通常的商用GPS C/A码接收机采用2bit量化。针对这种结构,本文给出了一种基于bitwise方法进行相关运算,具有变采样率载波表的软件接收机平台实现,并对捕获算法,跟踪算法,数据存储进行了优化。相比于传统的软件接收机,此平台结构简单,计算复杂度低,可扩展性较强。利用实际采集的数据,对接收机的工作性能进行测试。在相同的CPU处理能力下,相比于传统的软件接收机,使用此平台对基带信号进行捕获和跟踪,其捕获速度明显加快,能够同时跟踪的通道个数也有大幅提升。最后,对接收机的计算复杂度和平台的可扩展性进行了探讨。更多还原

【Abstract】 The implementation of GNSS software defined receiver(SDR) platform has been receiving considerable attention in satellite navigation area.Due to the different work principle between hardware and software,it would not be possible to just copy the architecture of a hardware receiver to a software receiver.Types of SDRs have been introduced for different requirements.The general commercial GPS-CA receiver is often 2-bit quantized.In this paper,an innovative implementation of SDR based on bitwise method as well as varied sampling frequency in carrier phase is proposed.Optimization algorithms in signal acquisition,tracking and data storage are considered to reduce the computation load.Compare with traditional SDRs,this platform enjoys simple architecture, low computation demand and high expansibility.Real data are used to test the performance of the receiver and results show that fast acquisition is achieved and the maximum number of tracking channel simultaneously is highly enlarged.Finally,the computation complexity and expansibility of the platform are discussed.更多还原