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2) As (1) above, but Email: email@example.com ABSTRACT Effects of different urban areas on propagation channels of land mobile satellite systems are analyzed using simulation. Initially, a digital elevation model, building databases and a vegetation model are processed to generate azimuthelevation maps of path states (clear, shadowed and blocked) for observers. At each simulation step, satellite positions are updated and azimuths and elevations of paths from satellites to observersdoi:10.1109/tvt.2007.900520 fatcat:4qsu6jn7w5cgrmnvmg4nj3ykr4