Multi-Frequency Precise Point Positioning using GPS and Galileo data with smoothed ionospheric corrections

The poor signal visibility and continuity associated with urban environments together with the slow convergence/reconvergence time of Precise Point Positioning (PPP), usually makes PPP unsuitable for land navigation in cities. However, results based on simulated open areas demonstrated that, once Ga...

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Main Authors:	Basile, Francesco, Moore, Terry, Hill, Chris, McGraw, Gary, Johnson, Andrew
Format:	Conference or Workshop Item
Language:	English
Published:	2018
Online Access:	http://eprints.nottingham.ac.uk/51823/ http://eprints.nottingham.ac.uk/51823/ http://eprints.nottingham.ac.uk/51823/1/B6-Basile%20v2.pdf

id	nottingham-51823
recordtype	eprints
spelling	nottingham-518232018-07-02T09:20:00Z http://eprints.nottingham.ac.uk/51823/ Multi-Frequency Precise Point Positioning using GPS and Galileo data with smoothed ionospheric corrections Basile, Francesco Moore, Terry Hill, Chris McGraw, Gary Johnson, Andrew The poor signal visibility and continuity associated with urban environments together with the slow convergence/reconvergence time of Precise Point Positioning (PPP), usually makes PPP unsuitable for land navigation in cities. However, results based on simulated open areas demonstrated that, once Galileo reaches final operational capability, PPP convergence time will be cut in a half using dual-constellation GPS/Galileo observations. Therefore, it might be possible to extend the applicability of PPP to land navigation in certain urban areas. Preliminary results, based on simulations, showed that GPS/Galileo PPP is possible where buildings are relatively short and satellites minimum visibility requirement is met for most of the time. In urban environments, signal discontinuity and reconvergence still represent the major problem for traditional PPP, which is based on the ionosphere-free combination of two-frequency pseudo-range and carrier phase. An alternative method to mitigate the ionosphere delay is proposed in order to ensure the best positioning performance from multi-frequency PPP. Instead of using the ionosphere-free combination, here low noise dual- or triple-frequency pseudo-range combinations are corrected with ionosphere delay information coming from federated carrier smoothing (Hatch) iono-estimation filters for each satellite. This method provides faster re- convergence time and ensures the best possible positioning performance from the Galileo Alternative BOC modulation in multi-frequency PPP. Indeed, even though Galileo E5 has small tracking noise and excellent multipath rejection, its PPP positioning performance is limited by the influence of E1 signal errors in the ionosphere-free combination, degrading the quality of the measurements. 2018-06-07 Conference or Workshop Item PeerReviewed application/pdf en http://eprints.nottingham.ac.uk/51823/1/B6-Basile%20v2.pdf Basile, Francesco and Moore, Terry and Hill, Chris and McGraw, Gary and Johnson, Andrew (2018) Multi-Frequency Precise Point Positioning using GPS and Galileo data with smoothed ionospheric corrections. In: IEEE/ION PLANS 2018, 23-26 Apr 2018, Monterey, USA. https://ieeexplore.ieee.org/document/8373531/
repository_type	Digital Repository
institution_category	Local University
institution	University of Nottingham Malaysia Campus
building	Nottingham Research Data Repository
collection	Online Access
language	English
description	The poor signal visibility and continuity associated with urban environments together with the slow convergence/reconvergence time of Precise Point Positioning (PPP), usually makes PPP unsuitable for land navigation in cities. However, results based on simulated open areas demonstrated that, once Galileo reaches final operational capability, PPP convergence time will be cut in a half using dual-constellation GPS/Galileo observations. Therefore, it might be possible to extend the applicability of PPP to land navigation in certain urban areas. Preliminary results, based on simulations, showed that GPS/Galileo PPP is possible where buildings are relatively short and satellites minimum visibility requirement is met for most of the time. In urban environments, signal discontinuity and reconvergence still represent the major problem for traditional PPP, which is based on the ionosphere-free combination of two-frequency pseudo-range and carrier phase. An alternative method to mitigate the ionosphere delay is proposed in order to ensure the best positioning performance from multi-frequency PPP. Instead of using the ionosphere-free combination, here low noise dual- or triple-frequency pseudo-range combinations are corrected with ionosphere delay information coming from federated carrier smoothing (Hatch) iono-estimation filters for each satellite. This method provides faster re- convergence time and ensures the best possible positioning performance from the Galileo Alternative BOC modulation in multi-frequency PPP. Indeed, even though Galileo E5 has small tracking noise and excellent multipath rejection, its PPP positioning performance is limited by the influence of E1 signal errors in the ionosphere-free combination, degrading the quality of the measurements.
format	Conference or Workshop Item
author	Basile, Francesco Moore, Terry Hill, Chris McGraw, Gary Johnson, Andrew
spellingShingle	Basile, Francesco Moore, Terry Hill, Chris McGraw, Gary Johnson, Andrew Multi-Frequency Precise Point Positioning using GPS and Galileo data with smoothed ionospheric corrections
author_facet	Basile, Francesco Moore, Terry Hill, Chris McGraw, Gary Johnson, Andrew
author_sort	Basile, Francesco
title	Multi-Frequency Precise Point Positioning using GPS and Galileo data with smoothed ionospheric corrections
title_short	Multi-Frequency Precise Point Positioning using GPS and Galileo data with smoothed ionospheric corrections
title_full	Multi-Frequency Precise Point Positioning using GPS and Galileo data with smoothed ionospheric corrections
title_fullStr	Multi-Frequency Precise Point Positioning using GPS and Galileo data with smoothed ionospheric corrections
title_full_unstemmed	Multi-Frequency Precise Point Positioning using GPS and Galileo data with smoothed ionospheric corrections
title_sort	multi-frequency precise point positioning using gps and galileo data with smoothed ionospheric corrections
publishDate	2018
url	http://eprints.nottingham.ac.uk/51823/ http://eprints.nottingham.ac.uk/51823/ http://eprints.nottingham.ac.uk/51823/1/B6-Basile%20v2.pdf
first_indexed	2018-09-06T14:23:08Z
last_indexed	2018-09-06T14:23:08Z
_version_	1610868367023931392

Multi-Frequency Precise Point Positioning using GPS and Galileo data with smoothed ionospheric corrections

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