GPS接收机中码相位测量精化方法的研究

精确的码相位测量是保证GPS接收机得到精确伪距值进而进行精确定位的一个重要前提。在已有码相位测量精化方法的基础之上提出了两种新的码相位测量精化的方法,讲述了两种方法的原理与具体实现方法,并利用蒙特卡洛方法进行了仿真实验,得到了码相位结果均值、码相位结果均值方差等一系列实验结果,对几种方法的精化效果从精确性、稳定性和跟踪性能等几个方面进行了比较分析,得出了相应的结论。与三角匹配法和二次曲线插值精化法相比,二阶最小二乘拟合精化法和广义延拓逼近精化法有明显优势;广义延拓逼近精化法的精化精度最高、跟踪精度最高,而二阶最小二乘拟合精化法的稳定性最好。

Study on Fining Methods of Code Phase Measurement in GPS Receivers

Precise measurement of code phase is an important precondition to ensure precise pseudorange in GPS receivers.On the basis of analysis of some fining methods of code phase measurement advanced by former researchers,two new fining methods of code phase were put forward.Their principles and the ways to realize them were stated.By Monte-Carlo simulation in the computer,some results,such as the mean values and variances of the code phase,were acquired,and the effects of these methods were compared and analyzed in several aspects,including accuracy,precision and tracking performance.Finally the conclusion was drawn.The accuracy and tracking performance of the fining method by generalized extended approximation are the best,and the precision of the fining method by LS(Least Square) fitting is highest.The two new methods have great advantages over the other methods.