Abstract
Dual frequency GPS receiver provides measurements at two frequencies, one at L1: 1575.42 MHz another at L2: 1227.60 MHz, over worldwide. Measurements of any GPS receiver are affected by instrument biases of satellite and receiver. Differential Code Bias (DCB) is the instrumental biases between two GNSS code observations at same or different frequencies. Knowledge of Precise Differential code bias for satellite and receiver end is essential for code based positioning, remote sensing of ionosphere, and other applications. This paper presents the estimation of DCB for GPS satellites and receiver along with the Local TEC estimation using spherical harmonic function. Measurements of single and multiple stations were taken for processing. DCB results obtained after the processing were compared with the results published by IGS Analysis center for validation, and found an agreement of ~±1 ns between them while processing with single station and ~ ±0.5 ns while processing with multiple receivers at different locations.
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Acknowledgements
This work was carried out at ISTRAC/ISRO. Authors would like to be grateful to Director ISTRAC, Associate Director ISTRAC and entire IGSA/NSA team for their kind support, motivation, and encouragement. Authors would like to be thankful to IGS community for providing quality Data and precise products for GPS satellite.
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Lingwal, Y., Singh, F.B., Ramakrishna, B.N. (2021). Estimation of Differential Code Bias and Local Ionospheric Mapping Using GPS Observations. In: Pandian, A.P., Palanisamy, R., Ntalianis, K. (eds) Proceedings of International Conference on Intelligent Computing, Information and Control Systems. Advances in Intelligent Systems and Computing, vol 1272. Springer, Singapore. https://doi.org/10.1007/978-981-15-8443-5_69
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DOI: https://doi.org/10.1007/978-981-15-8443-5_69
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