Quality assessment of FORMOSAT-3/COSMIC and GRACE GPS observables: Analysis of multipath, ionospheric delay and phase residual in orbit determination

Cheinway Hwang, Tzu Pang Tseng, Ting Jung Lin, Dražen Švehla, Urs Hugentobler, Benjamin Fong Chao

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

The precise orbit determination antennas of F3/C and GRACE-A satellites are from the same manufacturer, but are installed in different configurations. The current orbit accuracy of F3/C is 3 cm at arcs with good GPS data, compared to 1 cm of GRACE, which has a larger ratio of usable GPS data. This paper compares the qualities of GPS observables from F3/C and GRACE. Using selected satellites and time spans, the following average values for the satellite F3/C and satellite A of GRACE are obtained: multipath effect on the pseudorange P1, 0.78 and 0.38 m; multipath effect on the pseudorange P2, 1.03 and 0.69 m; occurrence frequency of cycle slip, 1/29 and 1/84; standard error of unit weight, 4 and 1 cm; dynamic-kinematic orbit difference, 10 and 2 cm. For gravity determination using F3/C GPS data, a careful selection of GPS data is critical. With six satellites in orbit, F3/C's large amount of GPS data will make up the deficiency in data quality.

Original languageEnglish
Pages (from-to)121-131
Number of pages11
JournalGPS Solutions
Volume14
Issue number1
DOIs
StatePublished - Jan 2010

Keywords

  • Cycle slip
  • FORMOSAT-3/COSMIC
  • GPS
  • GRACE
  • Multipath

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