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dc.contributor.authorHu, Guorong
dc.contributor.authorAbbey, Donald
dc.contributor.authorCastleden, James
dc.contributor.authorFeatherstone, Will
dc.contributor.authorOvstedal, O
dc.identifier.citationHu, Guorong and Abbey, Donald and Castleden, James and Featherstone, Will and Ovstedal, O. 2004. An Approach for Instantaneous Ambiguity Resolution for Medium- to Long-range Multiple Reference Station Networks. GPS Solutions Online: pp. 1-23.

Integer ambiguity resolution (AR) is a prerequisite for all high-precision (centimetre level) GPS applications that utilise multiple reference station (MRS) networks. However, due to the presence of distance-dependent GPS errors, notably atmospheric refraction, AR across the network is difficult on an epoch-by-epoch basis, especially for medium- to long-range (typically 30?130 km as used here) MRS networks. This paper presents an approach for medium- to long-range instantaneous AR for MRS networks, based on an ionosphere-weighted observation model and network geometry constraints, along with a multiple ambiguity validation test procedure. The performance of the proposed method was demonstrated through two case-study examples from Australia and Norway. Our test results show that the instantaneous AR success rate varied from 93% (131 km baseline) to 98% (35 km baseline).It is also shown that the adopted high-precision prediction models for the double-difference (DD) ionospheric delay and residual tropospheric zenith delay (RTZD) are of benefit to the high success rate of the network AR. Due to its epoch-by-epoch nature, the proposed approach is insensitive to cycle-slips, rising or setting satellites, or loss-of-lock.

dc.publisherJohn Wiley and Sons, Inc.
dc.titleAn Approach for Instantaneous Ambiguity Resolution for Medium- to Long-range Multiple Reference Station Networks
dc.typeJournal Article
dcterms.source.titleGPS Solutions
curtin.accessStatusFulltext not available
curtin.facultyDepartment of Spatial Sciences
curtin.facultyFaculty of Science and Engineering
curtin.facultyWA School of Mines

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