The number of global navigation satellite systems (GNSS) signals that can be received in dense urban areas has increased through the availability of multiple satellite constellations and high sensitivity receivers. However, in these constrained environments, the blockage and reflection of many of the signals by buildings and other obstacles means that poor positioning accuracy remains a problem...

Urban trees play a crucial role in urban climate many aspects. However, existing research has not adequately explored the impact from time-evolving perspective, that is, tree growth over time. To bridge this gap, study investigates wind tunnel effects of tree-to-canyon foliage cover and relative height (0.32–1.1 times canyon height), mimicking trees, on conditions street canyons during moderate...

This paper proposes a novel architecture for ultra-tight integration of a High Sensitivity Global Positioning System (HSGPS) receiver with an Inertial Navigation System (INS), to address the issue of GPS tracking and positioning in degraded signal environments. By enhancing signal tracking loops in receivers through the use of optimal controllers/estimators and aiding from external source such ...

The vehicular flow in the urban street canyon is considered. The classical field description is used in the modelling of the vehicular movement and of gaseous mixture in generic urban street canyon. The dynamical variables include vehicular densities, velocities, and emissivities: of pollutants, heat and exhaust gases, as well as standard mixture components' variables: densities, velocities, te...

Indoor and urban positioning is an important market which is foreseen to grow significantly in the future years. Unfortunately, in indoor and urban environment the classical mean of positioning based on Global Navigation

With the wind permanent flow in the cities, obtaining the minimal pollution in the environment is accessible. Different policies have been considered for optimization of cities such as attachment and or reduction of building parts like air-traps, ceiling forms and so on. Due to population growth in cities and the increasing need for resettlement these people in the cities, inevitably, to the hi...

Flow and dispersion of traffic pollutants in a generic urban neighborhood with avenue-trees were investigated with Computational Fluid Dynamics (CFD). In Part I of this two-part contribution, quality assessment and assurance for CFD simulations in urban and vegetation configurations were addressed,before in Part II flow and dispersion in a generic urban neighborhood with multiple layouts of ave...