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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。
Due to the implementation of AS (Anti-Spoofing) policy, it brings many difficulties to the precise ranging and high-precision navigation and positioning of the non-licensed users of GPS. Z tracking technology is an effective method to eliminate or weaken the impact of AS policy. In this paper, the basic principle of P (Y) code pseudorange measurement using Z tracking technology is expounded first, and then a single-point positioning program based on precise ephemeris is compiled and calculated by observing data from IGS tracking station. / A code and P (Y) code pseudoranges were compared, confirming the effectiveness of Z tracking technology.