Abstract
Centimeter level positioning accuracy can be achieved from GNSS receivers using carrier phase based differential positioning technique. However, even in the absence of absolute carrier phase measurements, cm-level horizontal and vertical positioning accuracy can be achieved in differential mode using code phase based measurements (Pseudoranges) and delta Pseudorange measurements. Therefore, in this paper, a variant of Hatch Filter is proposed on single differenced Pseudorange and delta-Pseudorange measurements. Estimation of rover position in real time mode was done by transmitting the corrections from NavIC base receiver to rover receiver and analysis was done for 13 consecutive days at SAC, Ahmedabad. The baseline considered for analysis was 9.69 m with rover receiver in static condition. Proposed method gives consistent results with horizontal position accuracy of 49.5 cm and vertical position accuracy of 95.5 cm with atleast 50% improved standard deviation in comparison to standalone NavIC.
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Acknowledgments
Authors are highly grateful to Shri Tapan Misra, Director, Space Applications Centre, Ahmedabad for his continuous support and guidance. Authors also express their sincere gratitude to Associate Director Shri D K Das and support of Group Director SNGG, Shri S N Satasia, Division Head, SNTD, Ms Saumi De and HOD of CE department of CSPIT, Changa, Dr. Amit Ganatra. Authors also acknowledge SNTD, SNGG and SNAA engineers who have provided their support in this activity.
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Shukla, A.K., Thakkar, P.K., Bhalla, S. (2018). NavIC Relative Positioning with Smoothing Filter and Comparison with Standalone NavIC. In: Singh, M., Gupta, P., Tyagi, V., Flusser, J., Ören, T. (eds) Advances in Computing and Data Sciences. ICACDS 2018. Communications in Computer and Information Science, vol 906. Springer, Singapore. https://doi.org/10.1007/978-981-13-1813-9_41
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DOI: https://doi.org/10.1007/978-981-13-1813-9_41
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