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Comparison of GPS Velocity Obtained Using Three Different Estimation Models

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Abstract

This study analyses the GPS velocity estimation performances of three different estimation models, namely, the time-differenced carrier phase velocity estimation (TDCPVE), Doppler observation velocity estimation (DopplerVE), and precise point positioning velocity estimation (PPPVE). Static and vehicle kinematic experiments are conducted for validation. Under simulated kinematic conditions using static data, the accuracy of the DopplerVE is the worst, and the precision of the velocity by the PPPVE is the same as with the TDCPVE. Under kinematic conditions, the accuracies of the three methods are related to the motion state of the mobile carrier (such as its acceleration and turning). When the sampling interval is 1 s, the TDCPVE can obtain precise velocity using a single-frequency stand-alone GPS receiver; the TDCPVE and DopplerVE can obtain accuracies of the same order of magnitude with broadcast and precise ephemerides, and can be used for real-time velocity measurement; the PPPVE can obtain not only an accurate position, but also an accurate velocity.

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ACKNOWLEDGMENTS

The work was partly supported by the program of the National Natural Science Foundation of China (Grant No. 41 674 034, 4 197 040 339), and the Chinese Academy of Science (CAS) Programs of “Pioneer Hundred Talents” (Grant No. Y923YC1701), Key Research Program of Frontier Sciences (Grant No. QYZDB-SSW-DQC028).

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Correspondence to Rui Tu.

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Xingxing Wang, Tu, R., Han, J. et al. Comparison of GPS Velocity Obtained Using Three Different Estimation Models. Gyroscopy Navig. 11, 138–148 (2020). https://doi.org/10.1134/S2075108720020091

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  • DOI: https://doi.org/10.1134/S2075108720020091

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