A simulation model is proposed to represent the channel of the Global Positioning System (GPS). Initially, a digital elevation model, building databases, and a vegetation model are processed to generate azimuth-elevation maps of path states (clear, shadowed, and blocked) for a large number of observers. At each simulation step, satellite positions are… (More)
This paper presents the results from an ultra wideband (UWB) indoor measurement campaign and describes a 3D beam trace pyramidal method that allows one to characterize the channel over a bandwidth of 850 MHz. The UWB channel characteristics are assessed in terms of mean delay, delay spread and coherence bandwidth.