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MATI AB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。-In order to optimize the GPS receiver baseband digital signal process and improving the accuracy of pseudorange measurements and GPS positioning accuracy is required　the perspective of despreading demodulation, synchronization loop corresponding mathematical model, analyze GPS receiver baseband digital signal processing algorithms. Cyclic correlation method as a signal acquisition method, as a signal using Costas loop tracking method, in MATI AB environment to achieve the corresponding algorithm design, verification and simulation. Verification results show that the algorithm can provide rapid acquisition and tracking software CPS receiver, is a suitable and efficient software CPS receiver processing algorithms, for the development of GPS receiver products and carry out research work in related fields have important significance.