Carrier phase surveying with Garmin handheld GPS receivers

Citation
Cj. Hill et al., Carrier phase surveying with Garmin handheld GPS receivers, SURV REV, 36(280), 2001, pp. 135-141
Citations number
1
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geological Petroleum & Minig Engineering
Journal title
SURVEY REVIEW
ISSN journal
0039-6265 → ACNP
Volume
36
Issue
280
Year of publication
2001
Pages
135 - 141
Database
ISI
SICI code
0039-6265(200104)36:280<135:CPSWGH>2.0.ZU;2-B
Abstract
GRINGO (GPS RINEX Generator) is a program which has been developed at the I nstitute of Engineering Surveying and Space Geodesy (IESSG) at the Universi ty of Nottingham, to record the pseudorange and carrier phase data from 12- channel Garmin handheld GPS receivers, in standard RINEX (REceiver INdepend ent EXchange) format. It offers owners of these receivers the possibility o f post-processing to an accuracy of approximately 5 m (with pseudoranges) o r a few cm (with carrier phase), without having to invest in separate DGPS receiving equipment or expensive survey-grade receivers. They retain the be nefits of an inexpensive receiver wit a user-friendly interface and powerfu l navigation features, but gain the possibility of improved accuracy if nee ded. A number of experiments have bee carried out to assess the accuracy of posi tioning with Garmin raw measurement data. Experiments over a 3 km baseline with various session lengths have shown th at float solutions with the Garmin carrier phase can achieve better than 20 cm in 15 minutes, and approximately 5 cm with 30 minutes. Ambiguity fixed solutions can achieve approximately 1 cm accuracy in 30 minutes. A zero bas eline test, with two garmin receivers attached to a single static antenna, has shown that under ideal conditions, even sub-millimeter accuracies are p ossible in as little ast 10 minutes. Over a longer baseline (>200 km), the effects of the atmosphere on the meas ured with geodetic receivers has confirmed that th atmosphere affects the G armin receivers in the same way as it does the geodetic receivers. This paper will present the results of these and other experiments.