Revised expression of vehicle noise propagation over ground.

Sound propagation over soft ground without and with crops and potential for surface transport noise attenuation.

Growing demand on transportation, road, and railway networks has resulted in increased levels of annoyance from road traffic. Optimized use of green surfaces in combination with vegetation may be desirable as a method for reducing the noise impact of road traffic in urban and rural environments. Sound propagation over soft ground and through crops has been studied through outdoor measurements a...

Spatial modelling of railway noise propagation

In recent decades, population growth and progress of technology have shaped large and compact urban settlements. Existence of huge transportation systems and developed urban infrastructures are among the most important properties of modern cities. In spite of prompt transit and facilitated daily activities, development of transportation systems causes many problems, including traffic, air and n...

Propagation of Radio \vavj’s over a Stratified Ground*

The propagation of vertically polarized radio waves over a horizontally stratified medium is investigated. A general expression for the “wave tilt” is derived for the case of any number of layers with arbitrary properties in each layer. Numerical calculations are carried out for the special case of only two layers which show that the conductivity and dielectric cxlnstanl variations of the Ionc~...

Sound propagation over screened ground under upwind conditions

Vehicle to Vehicle RF Propagation Measurements

We present results from vehicle to vehicle RF propagation measurements centered at Se0 M H z We focus on determining dehy s p r e a probability distribution parameters (in particular; the Rician K factor) and p t h loss rates. Our results are discussed with implications for the use of RF communication between automobiles in Intelligent Vehicle Highway System (IVHS). Our paper consists of a desc...