Multi-Constellation GNSS Performance Evaluation for Urban Canyons Using Large Virtual Reality City Models
نویسندگان
چکیده
منابع مشابه
Modeling GNSS Signals in Urban Canyons using Visibility Graphs
This paper addresses the problem of modeling and simulating RF-signals captured by receivers of Global Navigation Satellite Systems (GNSS) in urban canyons. The presence of tall buildings in urban canyons often block lines of sight between receivers and GNSS satellites, and therefore signals reach the receivers indirectly, after bouncing off buildings. These multi-path and echo-only effects are...
متن کاملShadow Matching: A New GNSS Positioning Technique for Urban Canyons
The Global Positioning System (GPS) is unreliable in dense urban areas, known as urban canyons, which have tall buildings or narrow streets. This is because the buildings block the signals from many of the satellites. Combining GPS with other Global Navigation Satellite Systems (GNSS) significantly increases the availability of direct line-of-sight signals. Modelling is used to demonstrate that...
متن کاملRapid Production of Virtual Reality City Models
The growing demand for detailed city models has stimulated research on efficient 3D data acquisition. Over the past years, it has become evident that the automatic reconstruction of urban scenes is most promising if different types of data, possibly originating from different data sources are combined. In the approach presented in this paper the geometric reconstruction of urban areas is based ...
متن کاملFast Production of Virtual Reality City Models
Virtual reality applications in the context of urban planning presume the acquisition of 3D urban models. Photo realism can only be achieved if the geometry of buildings is represented by a detailed and accurate CAD model and if artificial texture or real world imagery is additionally mapped to the faces and roofs of the buildings. In the approach presented in this paper height data provided by...
متن کاملImproving Accuracy of GNSS Devices in Urban Canyons
This paper addresses the problem of calculating the accurate position of a GNSS device operating in an urban canyon, where lines of sight (LOS) with navigation satellites are too few for accurate trilateration calculation. We introduce a post-processing refinement algorithm, which makes use of a 3D map of the city buildings as well as captured signals from all traceable navigation satellites. T...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Navigation
سال: 2012
ISSN: 0373-4633,1469-7785
DOI: 10.1017/s0373463312000082