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Contribution of Pseudolite Observations to GPS Precise Surveys
Yongqi Chen,Xiufeng He 대한토목학회 2008 KSCE JOURNAL OF CIVIL ENGINEERING Vol.12 No.1
Although GPS has been widely used for precision surveys, many survey environments, like in urban areas, deep open-pit minesand valleys, limit the number of visible GPS satellites, deteriorating the survey accuracy. In addition some engineering projectsrequire higher positioning accuracy in a particular direction. A GPS-only system hardly satisfies the requirements. Pseudolite-augmented GPS survey technique can strengthen the positioning geometry. Pseudolite (PL) measurements, however, suffer fromvarious sources of errors different from GPS observations. In order to employ them fo mustbe treated properly. This paper discusses of the major sources of errors in PL measurements and the methodologies for theirmitigation. Some experimental tests are then presented.