期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2007
卷号：XXXVI-5/C55
出版社：Copernicus Publications
摘要：The method of precise point positioning (PPP) using un-differenced code and carrier phase observations in combination with measurement corrections is discussed. The implementation of PPP in mobile mapping is addressed. Two approaches are investigated. In the first, measurement corrections optimized for the work area, including atmospheric corrections, are wirelessly received from a local service provider operating a local real-time GPS reference network. In the second approach, only precise orbits and clock corrections received from an international service provider through the Internet are used. One major problem of relying on wireless corrections is the possibility of facing interruptions in reception of the measurement corrections, which would result in the deterioration of the PPP performance. A method is presented to solve this problem, in which the orbital, clock and wet tropospheric corrections stored during operation are lumped together, predicted in real time as a time series and used in the PPP mode when breaks of signal reception take place. To improve system reliability and to accelerate the process of phase ambiguity resolution, particularly when using global corrections, a dual-antenna system fixed on board the mobile mapping vehicle is utilized. The two antennae are also used to determine the orientation of the mapping sensors by determining the heading and pitch of the vehicle. An adaptive Kalman filtering approach is utilized in the system. The filter is used to adaptively reflect dynamics changes in vehicle trajectory through the use of a measurement residual sequence. Testing of the system showed that it has a good overall performance. It can achieve centimeter to decimeter positioning accuracy, and attitude determination accuracy at the arc-minute level
关键词：Precise Point Positioning; Wireless; Mobile Mapping; Prediction; Attitude Determination
