GPS接收机数字基带信号处理算法研究

A Processing Arithmetic of Digital Baseband Signals in GPS Receiver

为了优化GPS接收机数字信号基带处理过程,提高伪距测量精度和GPS定位精度,需要从解扩解调的角度,建立相应同步环路的数学模型,分析GPS接收机基带数字信号处理算法。采用循环相关法作为信号捕获方法,采用Costas环作为信号跟踪方法,在MATLAB环境下实现了相应的算法设计、验证与仿真。验证结果表明这种算法能够为软件CPS接收机提供快速捕获及跟踪能力,是一种适用而高效的软件CPS接收机处理算法,对于开发GPS接收机产品以及开展相关领域的研究工作都具有重要的意义。

For improving the process of the digital signal disposal arithmetic of the baseband of GPS receiver and improving the precision of the measurement of pseudorange and positioning of GPS, a digital signal disposal arithmetic of the baseband of GPS receiver was analyzed by setting up the mathematic model of the corresponding synchronization part. The circular correlation algorithm was presented and employed as the signal acquisition algorithm, and the Costas loop as the signal tracking algorithm. The design and validation and simulation of the digital signals disposal arithmetic of GPS receiver were finished based on the platform of MATLAB. The test results show that this acquisition algorithm can provide the software GPS receiver with fast signal acquisition and tracking performance. It is a suitable and efficient acquisition algorithm for the software GPS receiver. Also, it is important to develop GPS receivers and launch into the research of related domain.