Efficient obstruction analysis for gnss relative positioning of terrestrial mobile mapping system
Journal
Survey Review
Journal Volume
47
Journal Issue
342
Pages
153-162
Date Issued
2015
Author(s)
Abstract
A mobile mapping system (MMS) is a combination of several modern sensors and is capable of acquiring meticulous spatial information in a fast and automatic manner. However, the result obtained is highly dependent on the quality of the global navigation satellite system (GNSS) which is expected to constantly provide accurate positioning solutions for the system. As a consequence, in an urban or mountainous area where satellite signals are frequently obstructed by local topography, the reliability of a terrestrial MMS system is not always guaranteed. In this study, a rigorous approach for predicting GNSS satellite reception under topographic obstructions along an MMS surveyed path is developed. By utilising a digital terrain model and a line-of-sight analysis, visible satellites for a moving platform are identified and used for estimating positioning quality under a GNSS relative positioning model. Based on the results from real case studies, it is illustrated that the proposed approach provides a reliable prediction for GNSS satellite obstruction and relative positioning quality. Consequently, the locations and/or epochs associated with poor GNSS positioning qualities can be identified beforehand and an appropriate survey schedule can thus be arranged. © 2015 Survey Review Ltd.
Subjects
Global navigation and satellite system (GNSS); Line-of-sight analysis; Mobile mapping system (MMS); Obstruction of satellite signal; Quality assessment
SDGs
Other Subjects
GNSS; mapping; satellite imagery; sensor; terrestrial environment; topography
Type
journal article