Abstract
The factual data on error of positioning in VRS GPS networks have been analyzed, where the mobile receiver is provided with VRS. The method of highly informative zone is suggested for removal of initial vagueness in selection of reference stations for purposes of development of VRS on the basis of minimum GPS network, composed of three reference stations. The recommendations on use of suggested method are given.
Highlights
According to work [4], in networked real time kinematic (RTK) (NRTK) systems the distance between reference station (RS) and mobile receiver is to be determined as a maximum value of radius of the circle which encompasses the zone, where signal of appropriate RS can be used efficiently together with sent signals having the format of International Radio technical Commission of Sea Service (RTCM) (Figure 1)
As it is noted in the work [5], in the system ROMPOS (Romania), which is the NRTK type system, the high accuracy of positioning is achieved as follows
The MR sends its data relating its approximate position to the Control Center via Internet
Summary
According to work [4], in NRTK systems the distance between RS and mobile receiver is to be determined as a maximum value of radius of the circle which encompasses the zone, where signal of appropriate RS can be used efficiently together with sent signals having the format of International Radio technical Commission of Sea Service (RTCM) (Figure 1). According to the work [8], in order that the results of measurements of carrier’s frequency’s phase accepted in RS of network were transformed to the simulated result of phase measurements of VRS carrier’s frequency’s phase, some operations, including following, should be carried out: 1) Removal of ambiguities occurred due to double differencing of phase of carrier’s frequency; 2) Calculation of models of errors, which depends on distances; 3) Development of ionosphere model, based on a linear ionosphere combination; 4) Development of geometrical model, containing the troposphere and orbital errors and based on linear combination of them In this case the processing of data can be carried out in central processor or can be distributed between the central processor and users. We shall describe the proposed method for selection of place for development of VRS
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