Abstract
Abstract: This study compares in quantitative terms two methods of differential corrections to GPS positioning from the code-based pseudoranges. The differential method calculated from the coordinates (Latitude, Longitude and Altitude), called Position-Domain DGPS, has simple implementation and easy transmission by the correction vector. The second method, called Pseudorange-Domain DGPS has a more elaborate algorithm, focused on the pseudorange correction for each visible satellite, which consumes more processing time and increases the complexity in the transmission of the corrections. Notwithstanding a few variations from this DGPS techniques proposed, this work intends to verify in a numeric way the bias and precision offered by these two well-known methods in different devices and situations, to assess in which context each method would be more advantageous when one what to apply a simple DGPS correction; showing how much is the gain by way of bias the more elaborated method is. The results demonstrate that in favorable conditions, the Position-Domain offered an improvement of approximately 50% in positioning, 35% in dispersion, but without any significant bettering in altimetry or in the maximum values; wile the Pseudorange-Domain method showed 70% in positioning, 75% in precision, 60% for maximum values and numbers close to zero on average altimetry.
Highlights
The techniques of GNSS (Global Navigation Satellite Systems) positioning can be divided into two main methods: absolute and relative positioning
The Differential Global Positioning System (DGPS) term is used in various relative positioning methods, historically the term has referred to the corrections made in the Carrier Code Positioning, called standard point positioning (SPP) and in real-time (MONICO, 2008)
Two antennas were used as Reference Stations: both were installed at two points with wellknown coordinate and positioned in open-sky, i.e. without obstructions or interference with the horizon line, with a good reception of signals transmitted from almost all the satellites that could be visible
Summary
The techniques of GNSS (Global Navigation Satellite Systems) positioning can be divided into two main methods: absolute and relative positioning. The improvement when used the relative method occurs because there is a high correlation among ionospheric, tropospheric and satellite ephemeris errors between two stations. It can be especially true if the two stations are quite close, i.e., within a given area in which a certain homogeneity of the atmosphere can be considered (Seeber, 2003), that can be about 10 km. Differential Global Positioning System (DGPS) is a relative technique to enhance the positioning using one or more reference stations, each equipped with a GPS receiver and sending corrections to user receiver ( called rover receiver). The DGPS term is used in various relative positioning methods, historically the term has referred to the corrections made in the Carrier Code Positioning, called standard point positioning (SPP) and in real-time (MONICO, 2008)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
