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• W2969160496 abstract "The use of a Real Time Kinematic (RTK) enablesposition accuracy increase up to within severalcentimeters. The GNSS common errors are highlycorrelated in a small time-latency and from a shortdistance, so an RTK correction message generated from areference station can easily cancel it out. A decorrelationerror, however, becomes larger when the correction agegets older or the distance between the reference and arover grows, so the single reference station (RS) shouldbroadcast a RTK correction message every second withina 10-20km baseline. To reduce the temporal decorrelationerror, SNUR-2000 v2.2 has been suggested as a RTKCompact Correction in RTCM Message, and it has shownthat the accuracy degradation is negligible even under alow-rate (500bps) data-link. On the other hand, Network RTK is a maturing technology that can compensate forthe spatial decorrelation error. Currently, there are several Network RTK method in the market including the Master- Auxiliary concept (MAC), Virtual Reference Stations(VRS), and Fl„chenkorrekturparameter(FKP). Each ofCompact RTK or Network RTK provides a propersolution to either temporal- or spatial-related issue, butnone of them deals with both decorrelation errors.This paper suggests a combination method of theCompact and Network RTK and shows it can reduce thetemporal and spatial decorrelation error at a time.Network-based RTK methods generally use conventionalobservation-based messages for RTK correction such asRTCM version 3 Message Type 1004. These messagesare so susceptible to the latency that the master referencestation should broadcast them every second. The SNUR-2000 protocol and its efficient transmission technique,which were designed to reduce the latency effect of asingle RS RTK, are still helpful to the network RTK. Inthis paper, we prove its compatibility with all thegeneralized Network RTK methods theoretically. Toverify this compatibility, we processed 1 hr rinex datafrom the CORS reference stations in North Carolina State.The system construction is the same as that of the normalnetwork RTK, which consists of one master and severalauxiliary stations. Using the GNSS raw observables andmeteorological data transmitted from all the stations, thephase ambiguities of master station can be estimated andthose from all stations in the network are reduced to acommon level. The master station broadcasts CompactRTK correction message instead of the Type 1004message, and network RTK correction messages areregularly transmitted in the RTCM-recommended format.No matter what network RTK method may be applied,our Compact Network RTK resolves the ambiguity of thecarrier phase in 10-40 seconds and determines theposition with 6~7cm horizontal and 7~8cm vertical error(95%) in the 50-60km radius-region.The Compact RTK Correction can make the MACtechnique be available in even a 700 bps data-link, whileconventional one should use at least 1900bps. FKPmethod using RTCM message type 1004 needs 2000bpsdata rate, but 600 bps is enough for it to be operated with the Compact RTK. In the case of VRS, moreover, we canreduce the baud-rate from 1400bps to 500bps without asevere degradation of accuracy. The Compact RTKCorrection is not only compatible with general RTKnetwork solutions, but also beneficial to them in the senseof data rate. We expect this compatibility and contributionof Compact Network RTK correction enable future RTKservices to be wide, general, and efficient." @default.
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• W2969160496 date "2009-01-28" @default.
• W2969160496 modified "2023-09-26" @default.
• W2969160496 title "Temporal and Spatial Decorrelation Error Reduction by a Compact Network RTK" @default.
• W2969160496 hasPublicationYear "2009" @default.
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