نتایج جستجو برای: urban canyon positioning
تعداد نتایج: 217374 فیلتر نتایج به سال:
Portraying urban functional zones provides useful insights into understanding complex urban systems and establishing rational urban planning. Although several studies have confirmed the efficacy of remote sensing imagery in urban studies, coupling remote sensing and new human sensing data like mobile phone positioning data to identify urban functional zones has still not been investigated. In t...
Fault detection and exclusion (FDE) is significant for integrity monitoring of GNSS positioning autonomous systems with navigation requirements. Moreover, the urban canyon scenario introduces additional challenges to existing FDE monitoring, causing missed or false alarms, due significantly increased percentage fault measurements. This paper proposed a sliding window aided based on factor graph...
With the rapid progress in the development of wireless technology, Global Positioning System (GPS) based vehicle navigation systems are being widely deployed in automobiles to serve the location-based needs of users and for efficient traffic management. An essential process in vehicle navigation is to map match the position obtained from GPS (or/and other sensors) on a road network map. This pr...
The Dispersion of Air Pollution and its Penetration into the Local Environment (DAPPLE) project brings together a multidisciplinary research group that is undertaking field measurements, wind tunnel modelling and computer simulations in order to provide better understanding of the physical processes affecting street and neighbourhood-scale flow of air, traffic and people, and their correspondin...
This paper examines the method to simulate heat balances on building and urban surfaces by combining the 3D CAD-based thermal environment simulator with 3D steady RANS CFD simulations. The simulation results of the distribution of convective heat transfer coefficient in an urban canyon model are compared with that of a wind tunnel experiment. The effects of building geometries, including verand...
This paper describes an efficient urban outdoor and indoor wave propagation model that supports receiver performance and coverage analyses as well as system effectiveness analyses within urban canyon environments described in the Compact Terrain Database (CTDB) format. The model has been used to support Joint MEASURE based analyses of GPS III performance/coverage within a typical urban environm...
abstract: one of the most visited & important spaces in different countries by tourist are urban areas. the old tehran which major part is located in district 12 is historical showcase of the capital, but, its hiidden cultural attraction is not used as it should be. this thesis occasionally engage in studying the efficacy of correct installation of travel guide boards in welfare & easily acc...
Generally, accuracy of GPS(Global Positioning System) is higher than that of cellular network. But in tall building urban area or indoor, relatively weak GPS signal makes the positioning unstable and inaccurate. TDOA(Time Difference of Arrival) is one of the most widely used positioning methods in cellular mobile communication systems, but its accuracy is not high enough to meet the growing dem...
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