Abstract
The orbital error is one of the errors in GPS which affect the accuracy of GPS positioning. In this research GPS broadcast, ultra-rapid, rapid and precise satellite ephemerides are used for processing different baseline lengths among some CORS stations by using the Trimble Business Center software (TBC) and different satellite ephemerides (NRCan ultra-rapid, NRCan rapid and IGS final) are tested in CSRS-PPP online application at the same CORS stations. In this research, when using TBC software for processing the different baseline lengths by using the different satellite ephemerides and compared the coordinates of CORS stations which obtained from the different satellite ephemerides with each other. The results showed that the best satellite ephemerides closest to rapid and final satellite ephemerides are the ultra-rapid (00 UTC) and ultra-rapid (06 UTC). When processing the same CORS stations which used at TBC on CSRSPPP online application by using the different satellite ephemerides it is found also that the NRCan ultra-rapid closest to final satellite ephemerides.
Highlights
The accuracies to compute the positioning are various depending on the employed GPS error mitigation methods.The DGPS can provide mm to cm level accuracy because most errors can be removed from the differential process between receivers
Centre software (TBC), using the broadcast satellite ephemerides, the baselines which are less than 500 km got a fixed solution while the baselines that have more than 500 km length got float solutions
When processing the different baseline lengths by using Trimble Business Center software (TBC) software, all coordinates which obtained by using final satellite ephemerides have the same coordinates by using rapid satellite ephemerides, see Table 1
Summary
The accuracies to compute the positioning are various depending on the employed GPS error mitigation methods. When using the single receiver, PPP has to separately consider all GPS errors, in order to obtain comparable positioning accuracy as DGPS (Shi, 2012). There are three forms of IGS orbit combination solutions are ultra-rapid, rapid, and final (precise). The IGS Rapid products have a quality nearly comparable to that of the final (precise) products. They are available on a daily basis with a delay of about 17 h after the end of the previous observation day, i.e., IGS Rapid products are released daily at about 17:00 UTC. Laboratory (JPL) GIPSY-OASIS II software since August (Huot et al, 1997)
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