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GENG Tao, DING Zhihui, XIE Xin, LV Yifei. Accuracy Assessment of Multi-frequency and Multi-GNSS Velocity Estimation With Time Differenced Carrier Phase Method[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200226
Citation: GENG Tao, DING Zhihui, XIE Xin, LV Yifei. Accuracy Assessment of Multi-frequency and Multi-GNSS Velocity Estimation With Time Differenced Carrier Phase Method[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200226

Accuracy Assessment of Multi-frequency and Multi-GNSS Velocity Estimation With Time Differenced Carrier Phase Method

doi: 10.13203/j.whugis20200226
Funds:

The National Natural Science Foundation of China (No. 41674004, 41974036) and Natural Science Foundation of Hubei Province (No. 2019CFA051).

  • Received Date: 2020-05-14
    Available Online: 2021-05-07
  • Based on the method of time differenced carrier phase, the mathematical model of multi-GNSS velocity estimation is introduced and the error sources are analyzed. Using the real data, the accuracy and performance of velocity determination at each GNSS frequency point and multi-GNSS are tested and analyzed. The results show that the accuracy of velocity determination at different frequency is different, the velocity estimation at B1I, B1C, B3I frequency points in BDS and E1, E5a, E6, E5b, E5 frequency points in Galileo have the same precision, with the horizontal direction better than 1.5 mm/s and the vertical direction better than 3 mm/s; the velocity estimation accuracy at B2I frequency in BDS is the same as that at L1, L2 and L5 frequency points in GPS with the horizontal accuracy of 1.5-2 mm/s and the vertical accuracy of 3-4 mm/s; the velocity estimation accuracy at G1 and G2 frequency in GLONASS is the worst, with 3-4 mm/s in horizontal direction and 5-5.5 mm/s in vertical direction. The accuracy of double frequency ionospheric free combination is lower than that of single frequency due to the amplification of the observation noise. In addition, the combination of multiple GNSS increases the number of visible satellites, reduces the PDOP value, and can significantly improve the velocity measurement accuracy. Compared with the single GPS system, the accuracy of GPS/BDS/GLONASS/Galileo velocity estimation is improved by 40% in horizontal direction and 46% in vertical direction. At 40° elevation cut-off, the availability rate is improved from 48% to 98% under the condition of the horizontal velocity better than 1 cm/s and the vertical direction better than 2 cm/s.
  • [1] Xie X, Geng T, Zhao Q, et al. Performance of BDS-3:Measurement Quality Analysis, Precise Orbit and Clock Determination[J]. Sensors (Basel, Switzerland),2017,17(6).
    [2] Freda P, Angrisano A, Gaglione S, et al. Time-differenced Carrier Phases Technique for Precise GNSS Velocity Estimation[J]. Gps Solutions,2015, 19(2):335-341.
    [3] Hohensinn R, Geiger A, Willi D, et al. Movement Detection Based on High-Precision Estimates of Instantaneous GNSS Station Velocity[J]. Journal of surveying engineering,2019,145(3):04019005.1- 04019005.14.
    [4] Flack C, Ramatschi M, Subarya C, et al. Near Real-time GPS Applications for Tsunami Early Warning Systems. Nat. Hazards Earth Syst. Sci., 2010,10(2); 181-189.
    [5] Geng T, Xie X, Fang R, et al. Real-time Capture of Seismic Waves Using High-rate Multi-GNSS Observations:Application to the 2015 Mw 7.8 Nepal earthquake[J]. Geophysical Research Letters, 2015, 43(1):161-167.
    [6] Fuhong W, Xiaohong Z, Jingsong H. Error Analysis and Accuracy Assessment of GPS Absolute Velocity Determination without SA[J]. Geo-spatial Information Science, 2008, 11(2):133-138.
    [7] Serrano, L., D. Kim, R. Langley, K. Itani, and M. Ueno. 2004. "A GPS Velocity Sensor:How Accurate Can It Be?-A First Look." In Proc., 2004 National Technical Meeting of the Institute of Navigation, 875- 885. Manassas, VA:Institute of Navigation.
    [8] Li M, Li W, Fang R, et al. Real-time High-precision Earthquake Monitoring Using Single- frequency GPS Receivers[J]. Gps Solutions, 2014, 19(1):27-35.
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Accuracy Assessment of Multi-frequency and Multi-GNSS Velocity Estimation With Time Differenced Carrier Phase Method

doi: 10.13203/j.whugis20200226
Funds:

The National Natural Science Foundation of China (No. 41674004, 41974036) and Natural Science Foundation of Hubei Province (No. 2019CFA051).

Abstract: Based on the method of time differenced carrier phase, the mathematical model of multi-GNSS velocity estimation is introduced and the error sources are analyzed. Using the real data, the accuracy and performance of velocity determination at each GNSS frequency point and multi-GNSS are tested and analyzed. The results show that the accuracy of velocity determination at different frequency is different, the velocity estimation at B1I, B1C, B3I frequency points in BDS and E1, E5a, E6, E5b, E5 frequency points in Galileo have the same precision, with the horizontal direction better than 1.5 mm/s and the vertical direction better than 3 mm/s; the velocity estimation accuracy at B2I frequency in BDS is the same as that at L1, L2 and L5 frequency points in GPS with the horizontal accuracy of 1.5-2 mm/s and the vertical accuracy of 3-4 mm/s; the velocity estimation accuracy at G1 and G2 frequency in GLONASS is the worst, with 3-4 mm/s in horizontal direction and 5-5.5 mm/s in vertical direction. The accuracy of double frequency ionospheric free combination is lower than that of single frequency due to the amplification of the observation noise. In addition, the combination of multiple GNSS increases the number of visible satellites, reduces the PDOP value, and can significantly improve the velocity measurement accuracy. Compared with the single GPS system, the accuracy of GPS/BDS/GLONASS/Galileo velocity estimation is improved by 40% in horizontal direction and 46% in vertical direction. At 40° elevation cut-off, the availability rate is improved from 48% to 98% under the condition of the horizontal velocity better than 1 cm/s and the vertical direction better than 2 cm/s.

GENG Tao, DING Zhihui, XIE Xin, LV Yifei. Accuracy Assessment of Multi-frequency and Multi-GNSS Velocity Estimation With Time Differenced Carrier Phase Method[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200226
Citation: GENG Tao, DING Zhihui, XIE Xin, LV Yifei. Accuracy Assessment of Multi-frequency and Multi-GNSS Velocity Estimation With Time Differenced Carrier Phase Method[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200226
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