GPS/GLONASS精密单点定位研究现状及关键技术
首发时间:2010-07-26
摘要:GPS精密单点定位是最近几年发展起来的一项卫星定位新技术,它利用精密卫星轨道和卫星钟差产品、双频测码伪距和载波相位观测值进行单台接收机定位,它可以在全球范围内进行作业并直接获得厘米级精度的ITRF框架坐标,但GPS作为一种基于卫星的导航定位系统,它的定位精度和可靠性在很大程度上依赖于观测到的卫星数量。在一些地方诸如城市峡谷、山区、露天矿区,可见卫星的数量常常不足以获得位置解,一种很好的解决办法就是组合GPS和GLONASS。本文重点介绍GPS/GLONASS精密单点定位技术的发展及其国内外研究状况,最后总结了组合精密单点定位技术的关键技术。
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The Research Status and Key Technology of GPS /GLONASS Precise Point Positioning
Abstract:GPS Precise Point Positioning (PPP) is a new satellite positioning technique in which precise satellite orbit and clock data, dual-frequency pseudo-range and carrier phase observables from one receiver are used to determine the position solution. PPP can be conducted globally and ITRF coordinates with centimeter-level accuracy can be achieved directly. However for such a satellite-based navigation and positioning system, the positioning accuracy and the reliability of positioning results are quite dependent on the number of visible satellites. In some situations such as urban canyons, open-pit mines and mountainous area, the number of visible satellites is insufficient to provide a position solution. A good strategy is to integrate GPS and GLONASS. This paper focuses on GPS/GLONASS precise point positioning technology and the research situation at home and abroad; at last the key technology of the combination of precise point positioning is concluded.
Keywords: GPS GLONASS Combined Precise Point Positioning
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