Robust Initial Position Estimate of GEO/IGSO Satellite from Projection based Processing of Range Observables

Anand, SK (2018) Robust Initial Position Estimate of GEO/IGSO Satellite from Projection based Processing of Range Observables. In: 8th International Conference on Localization and GNSS: Seamless Indoor-Outdoor Localization, ICL-GNSS 2018, 26 - 28 June 2018, Guimaraes.

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Abstract

The paper describes a methodology to obtain reliable and robust initial estimates of satellite position which is independent of satellite and receiver anomalies. In this method, range observables are processed using a projection based elimination of satellite and receiver dependent unknowns. A set of satellites and receivers are selected such that each satellite in the set is visible to all receivers in the same set. Satellite positions are then computed for each set using differential correction, resulting in multiple estimates of position for a single satellite. A screening methodology is applied which select positions with the statistically lower biases and analyze the resulting positions. The advantages of the method when compared to double differenced observables are, baseline selections are not required and estimates have a lower error correlation. However, the above constraint on satellite visibility for each receiver results in lesser data epochs sets in the case of MEO orbit. This is not seen in GEO/IGSO orbit based satellites where receivers have visibility of satellites for almost the entire day. This method is developed for control segment processing centers of GEO/IGSO satellites which are required to provide position estimates of the satellite in broadcast navigation data hours in advance.

Item Type:	Conference Paper
Publication:	ICL-GNSS 2018 - 2018 8th International Conference on Localization and GNSS: Seamless Indoor-Outdoor Localization, Proceedings
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the Institute of Electrical and Electronics Engineers Inc.
Keywords:	Orbits; Satellites; Tracking (position); Visibility, Differential correction; Error correlation; Initial estimate; Multiple estimates; Position estimates; Processing center; Satellite position; Satellite visibility, Global positioning system
Department/Centre:	Division of Interdisciplinary Sciences > Computational and Data Sciences
Date Deposited:	05 Aug 2022 11:29
Last Modified:	05 Aug 2022 11:29
URI:	https://eprints.iisc.ac.in/id/eprint/75405

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