【摘要】 差分GPS技术在智能交通系统中的应用主要体现在车辆定位和导航两个方面，而实现导航首先必须要解决定位问题。文章内容包括：差分GPS的定位原理(主要介绍伪距差分原理)，误差估算的数学模型，最后给出采用集中差分技术的应用实例以及对它的评价，并简要介绍了一些差分GPS设备。更多还原

【Abstract】 There are two ways using DGPS in ITS－vehicles location and navigation, and location is the base of navigation .This paper summarizes the theory of DGPS (mainly about pseudo-range DGPS) and presents the mathematical model for error estimation .At last an application using centralized differential GPS technology and its estimation are given .Some DGPS devices are introduced in addition.更多还原