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PPP-RTK functional models formulated with undiferenced and uncombined GNSS observations

Satellite Navigation 2022年第1期3卷 139-153,I0005页

作者： Baocheng Zhang Pengyu Hou Jiuping Zha Teng Liu State Key Laboratory of Geodesy and Earth’s Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhanChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina State Key Laboratory of Satellite Navigation System and Equipment Technology The 54th Research Institute of China Electronics Technology Group CorporationShijiazhuangChina

Technique PPP-RTK combines the advantages of both the Precise Point Positioning(PPP)and the Real-Time Kinematic(RTK)*** the emergence of multi-frequency Global Navigation Satellite System(GNSS)observations,it is preferable to formulate PPP-RTK functional models based on original(undiferenced and uncombined)*** there exist many variants of the undiferenced and uncombined PPP–RTK models,a unifed theoretical framework needs developing to link these *** this contribution,we formulate a class of undiferenced and uncombined PPP-RTK functional models in a systematic way and cast them in a unifed *** framework classifes the models into a code-plus-phase category and a phase-only *** category covers a variety of measurement scenarios on the network side,ranging from small-,medium-to large-scale *** each scenario,special care has been taken of the distinct ionospheric constraints and the diference between Code Division Multiple Access(CDMA)and Frequency Division Multiple Access(FDMA)*** key to systematically formulating these models lies in how to deal with the rank defciency problems *** opt for the Singularity-basis(S-basis)theory,giving rise to the full-rank observation equations in which the estimable parameters turn out to be the functions of original parameters and those selected as the *** the sequel,it becomes straightforward to derive for each scenario the user model as it,more or less,amounts to the single-receiver network *** from the presented theoretical framework,the relationships and diferences between various undiferenced and uncombined PPP-RTK models become clear,which can lead to the better use of these models in a specifc situation.

关键词： Global navigation satellite system(GNSS) Ambiguity resolution-enabled precise point positioning(PPP-RTK) Singularity-basis(S-basis) Undiferenced and uncombined Frequency division multiple access(FDMA) phaseonly

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