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

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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.

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Acknowledgments

This research is supported by the National Space Organization of Taiwan, under the project “Precise orbit determination and the gravity field determination from FORMOSAT-3/COSMIC data,” contract number 98-NSPO(B)-IC-FA07-01(J).

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Authors and Affiliations

  1. Department of Civil Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, 300, Taiwan, ROC

    Cheinway Hwang, Tzu-Pang Tseng & Ting-Jung Lin

  2. Institute of Astronomical and Physical Geodesy, Technical University of Munich, Arcisstrasse 21, 80333, Munich, Germany

    Dražen Švehla & Urs Hugentobler

  3. College of Earth Sciences, National Central University, 300, Jhongda Road, Taoyuan, 32001, Taiwan, ROC

    Benjamin Fong Chao

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  1. Cheinway Hwang
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  2. Tzu-Pang Tseng
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  3. Ting-Jung Lin
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  4. Dražen Švehla
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  5. Urs Hugentobler
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  6. Benjamin Fong Chao
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Correspondence to Cheinway Hwang.

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Hwang, C., Tseng, TP., Lin, TJ. et al. Quality assessment of FORMOSAT-3/COSMIC and GRACE GPS observables: analysis of multipath, ionospheric delay and phase residual in orbit determination. GPS Solut 14, 121–131 (2010). https://doi.org/10.1007/s10291-009-0145-0

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