Z跟踪技术下C/A码与P(Y)码伪距的精度比较

由于AS(Anti-Spoofing)政策的实施,给广大GPS非特许用户的精密测距和高精度导航、定位带来了不少困难,Z跟踪技术就是消除或减弱AS政策影响的一个有效方法。该文首先阐述了利用Z跟踪技术进行保密P(Y)码伪距测量的基本原理,然后采用自行编制的基于精密星历的单点定位程序,利用IGS跟踪站观测数据进行了计算,对C/A码与P(Y)码伪距的精度进行了比较,证实了Z跟踪技术的有效性。

Accuracy Compare on C/A Code and P Code Pseudoranges Based on Z-tracking Technique

Due to AS policies,unauthorized users have many difficulties on GPS precise ranging,navigation and positioning.Z-tracking technique is one effective method to eliminate the effect of AS.This paper firstly gives the principles of using the Z-tracking technique to measure confidential P(Y) code pseudoranges,then a large data set from IGS tracking stations is utilized for analysis and verification with the help of a precise satellite ephemeris-based point positioning software developed by authors.Some conclusions are given in the paper.