DBPapers
DOI: 10.5593/SGEM2014/B22/S9.002

ACHIEVEMENT OF DECIMETER LEVEL POSITIONING ACCURACY WITH SIRFSTARIII GPS RECEIVERS

J. Saczuk, G. Nykiel
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-11-7 / ISSN 1314-2704, June 19-25, 2014, Book 2, Vol. 2, 11-18 pp

ABSTRACT
Nowadays most of mobile devices are equipped with microcontrollers enabling to receive GPS signals. The most popular of them is a single frequency SiRFstarIII module which allows communication using two data formats: NMEA and SiRF Binary Protocol. These formats are used to output raw measurement data, such as pseudoranges, phase measurements, carrier frequency, clock bias, etc. Unfortunately, access to the carrier-phase is blocked and, in consequence, obtaining a high positioning accuracy using methods based on phase measurements, such as RTK, is impossible. The paper explains how to solve this problem by reconstruction of missing carrier phase observables from integrated carrier frequency measurements. Presented solution gives a possibility to obtain decimeter level positioning accuracy by SiRFstarIII GPS receiver using the RTK method. The obtained results prove possibility of using such receivers in professional geodetic applications e.g. for GIS purposes.

Keywords: GPS, RTK, SiRFstarIII