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Estimating Position from Millisecond Samples of GPS Signals (the “FastFix” Algorithm)

A new approach to GPS positioning is described in which the post-processing of ultra-short sequences of captured GPS signal data can produce an estimate of receiver location. The algorithm, called ‘FastFix’, needs only 2–4 ms of stored L1-band data sampled at ∼16 MHz. The algorithm uses a least-squa...

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Autor principal: Molteno, Timothy C. A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7696419/
https://www.ncbi.nlm.nih.gov/pubmed/33202743
http://dx.doi.org/10.3390/s20226480
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author Molteno, Timothy C. A.
author_facet Molteno, Timothy C. A.
author_sort Molteno, Timothy C. A.
collection PubMed
description A new approach to GPS positioning is described in which the post-processing of ultra-short sequences of captured GPS signal data can produce an estimate of receiver location. The algorithm, called ‘FastFix’, needs only 2–4 ms of stored L1-band data sampled at ∼16 MHz. The algorithm uses a least-squares optimization to estimate receiver position and GPS time from measurements of the relative codephase, and Doppler-shift of GNSS satellite signals. A practical application of this algorithm is demonstrated in a small, lightweight, low-power tracking tag that periodically wakes-up, records and stores 4 ms of GPS L1-band signal and returns to a low-power state—reducing power requirements by a factor of ∼10,000 compared to typical GPS devices. Stationary device testing shows a median error of 27.7 m with a small patch antenna. Results from deployment of this tag on adult Royal Albatross show excellent performance, demonstrating lightweight, solar-powered, long-term tracking of these remarkable birds. This work was performed on the GPS system; however, the algorithm is applicable to other GNSS systems.
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spelling pubmed-76964192020-11-29 Estimating Position from Millisecond Samples of GPS Signals (the “FastFix” Algorithm) Molteno, Timothy C. A. Sensors (Basel) Letter A new approach to GPS positioning is described in which the post-processing of ultra-short sequences of captured GPS signal data can produce an estimate of receiver location. The algorithm, called ‘FastFix’, needs only 2–4 ms of stored L1-band data sampled at ∼16 MHz. The algorithm uses a least-squares optimization to estimate receiver position and GPS time from measurements of the relative codephase, and Doppler-shift of GNSS satellite signals. A practical application of this algorithm is demonstrated in a small, lightweight, low-power tracking tag that periodically wakes-up, records and stores 4 ms of GPS L1-band signal and returns to a low-power state—reducing power requirements by a factor of ∼10,000 compared to typical GPS devices. Stationary device testing shows a median error of 27.7 m with a small patch antenna. Results from deployment of this tag on adult Royal Albatross show excellent performance, demonstrating lightweight, solar-powered, long-term tracking of these remarkable birds. This work was performed on the GPS system; however, the algorithm is applicable to other GNSS systems. MDPI 2020-11-13 /pmc/articles/PMC7696419/ /pubmed/33202743 http://dx.doi.org/10.3390/s20226480 Text en © 2020 by the author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Letter
Molteno, Timothy C. A.
Estimating Position from Millisecond Samples of GPS Signals (the “FastFix” Algorithm)
title Estimating Position from Millisecond Samples of GPS Signals (the “FastFix” Algorithm)
title_full Estimating Position from Millisecond Samples of GPS Signals (the “FastFix” Algorithm)
title_fullStr Estimating Position from Millisecond Samples of GPS Signals (the “FastFix” Algorithm)
title_full_unstemmed Estimating Position from Millisecond Samples of GPS Signals (the “FastFix” Algorithm)
title_short Estimating Position from Millisecond Samples of GPS Signals (the “FastFix” Algorithm)
title_sort estimating position from millisecond samples of gps signals (the “fastfix” algorithm)
topic Letter
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7696419/
https://www.ncbi.nlm.nih.gov/pubmed/33202743
http://dx.doi.org/10.3390/s20226480
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