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控制工程（北京） 2000年第3期 58-65页

作者： E.Glenn Lightsey John L.Crassidis F.Landis Markley 殷书平

本文介绍计算GPS姿态确定整数模糊解的一种新算法.该算法首先引用瞬时(静态)整数搜索法,利用一个几何不等式大大缩小搜索空间。然后利用批处理损失函数检验剩余的整数,以确定最优整数解。批处理损失函数将本体坐标系中表示的GPS矢线矢... 详细信息

本文介绍计算GPS姿态确定整数模糊解的一种新算法.该算法首先引用瞬时(静态)整数搜索法,利用一个几何不等式大大缩小搜索空间。然后利用批处理损失函数检验剩余的整数,以确定最优整数解。批处理损失函数将本体坐标系中表示的GPS矢线矢量表示为2个矢量之和;一个矢量与相位差测量有关,另一个与未知的整数倍波长有关。新算法有几个优点:不需要航天器的先验估计姿态信息;利用协方差阵表达式可检验算法本身的完整性;即使基线共面,也能判定整数模糊解。新算法的性能在一种动力学硬件仿真器上进行了检验。

关键词： GSP 全球定位系统姿态确定整数模糊度快速算法

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多频多模GNSS高精度定位关键技术与挑战

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武汉大学学报(信息科学版) 2023年第11期48卷 1769-1783页

作者：李博峰苗维凯陈广鄂同济大学测绘与地理信息学院上海200092

高精度全球导航卫星系统(global navigation satellite system,GNSS)定位技术拓展了位置服务行业的纵深发展,在智慧城市、智能交通和无人驾驶等领域得到了广泛应用,是当前卫星导航领域的热点。梳理了GNSS定位技术的现状和发展脉络,阐述... 详细信息

高精度全球导航卫星系统(global navigation satellite system,GNSS)定位技术拓展了位置服务行业的纵深发展,在智慧城市、智能交通和无人驾驶等领域得到了广泛应用,是当前卫星导航领域的热点。梳理了GNSS定位技术的现状和发展脉络,阐述多频多模GNSS高精度定位所涉及的整数模糊度固定、函数模型和随机模型融合等共性基础理论,介绍提升GNSS定位性能的非模型误差处理以及周跳探测与数据中断修复等关键技术。依托基础理论和关键技术的创新成果,介绍了同济大学GNSS团队近年来发展的4种多频多模GNSS高精度定位应用新技术,并展望了未来以GNSS为核心的高精度定位技术的发展趋势及其挑战。

关键词：整数模糊度高精度定位长距离RTK 数据融合海洋定位

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Near-field surface displacement and permanent deformation induced by the Alaska Mw 7.5 earthquake determined by high-rate real-time ambiguity-fixed PPP solutions

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Chinese Science Bulletin 2014年第34期59卷 4781-4789页

作者： Gang Chen Qile Zhao Faculty of Information Engineering Department of Surveying Engineering China University of Geosciences Geophysical Institute University of Alaska FairbanksFairbanks AK 99775-7320 USA GNSS Research Center Wuhan University

High-rate GPS data from the United States continuously operating reference stations in the Alaska region are processed using the recently developed precise point positioning(PPP) technique. The traditional PPP technique does not fix ambiguities into their integers because these ambiguities do not have an integer nature when data from a single receiver, as well as precise orbit and clock corrections, are used. Additional corrections, i.e.,uncalibrated phase delay(UPD), are needed to fix integer ambiguities and consequently improve positioning accuracy. This study proposes a methodology to compute for wide-lane and L2(the second L-band frequency) UPDs using the geometry-based model and subsequently applies these parameters to the computation for ambiguity-fixed solutions. The instantaneous displacements of near-field sites, as well as the permanent deformations after the earthquake, are therefore obtained for the January 5, 2013,Alaska earthquake. The real-time performance of PPP solutions are assessed by considering realistic data latency and data interval of corrections. Ambiguity-fixed solutions are compared with ambiguity-float ones. The comparison shows that the positioning accuracy can be improved significantly when the ambiguities are fixed correctly. Thesolutions using the real-time corrections are also compared with those using post-processing corrections, i.e., Center for Orbit Determination in Europe final orbit and *** the accuracy is somehow degraded because of the data latency and data interval, the real-time results are satisfactory for use in monitoring the small-scale deformation(1–2 cm) caused by the Alaska earthquake. In addition, the kinematic ambiguity-fixed PPP solutions for7 days around the earthquake are calculated to obtain permanent pre- and post-earthquake deformations. The deformations computed from real-time and post-processing corrections do not appear to be significantly different.

关键词：整数模糊度永久变形阿拉斯加实时性能地表位移 PPP 地震后近场

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