提高GPS定位精度的数据处理技术

尽管全球定位系统（GPS）已经是目前精度最高的无线电导航系统，但仍有许多用户不满足于GPS定位的原始精度，希望获得更高的性能。基于GPS输出信息的数据处理就是一种广泛采用的技术。GPS数据基本的处理方法有两种：基于GPS接收机输出数据的滤波、平滑处理；基于两个或多个GPS接收机的差分校正处理（DGPS）。差分GPS只能消除选择可用性和电离层时延等公共误差，对多径干扰仍无能为力。多径已成为近距差分的主要误差源。为了抗多径，本文还综述了两种先进的GPS数据处理方法：空间－时间处理抗多径方法和数据诊断与剔除抗多径方法。

Overview of GPS Data Processing to Improve Positioning Precision

Although the global positioning system (GPS) is the most accurate radio navigation system, a lot of users are still not satisfied with the accuracy of the original positioning. To improve the accuracy, the data processing based on the information output from a GPS receiver is widely used in many application systems. Basic data processing for GPS information includes: (a) filtering and smoothing for single GPS receiver, and (b) differential correction using two or more GPS receivers (DGPS). DGPS removes only the common errors such as selective availabi lity and ionospheric delay errors. But multipath which is not common error thus remains and therefore the dominant error source in DGPS. To mitigate multipath , advanced data processing for GPS which includes: (c)space time processing to mitigate multipath,(d) data diagnosing and excluding, is reviewed.