This paper introduces the components of real-time GPS system and the features of real-time GPS measurement, and probes into the application of GPS RTK in the urban alignment with actual example.

• 介绍了实时GPS系统的组成和实时GPS测量的特点,通过实例就GPS实时动态(RTK)测量技术在城市道路定线中的应用问题进行了探讨。