Due to the complexity of Vehicular Ad Hoc Networks, future driving assistance systems need to be validated through virtual test drives in a simulated environment. An accurate modeling of the vehicle-to-vehicle communication channel is crucial to enable a precise evaluation of such networkaware applications. Since existing ray-based methods cause long computation times, a new parallel GPU-based ray-launching simulation method is presented. The algorithmic improvements allow a high utilization of the GPU computing power, which results in significantly faster simulations while achieving high accuracy. The validation of the simulation results against realworld measurements showed a high level of agreement.

The influence of the vehicle environment on typical radiation patterns of roof antennas for satellite and as well for terrestrial communication is investigated. In order to separate the different effects on the electromagnetic wave, the antenna is simulated on several ground plates. The influence of edges close to the antenna, the curvature of the roof and glass is described. The simulated radiation patterns are compared to measurements carried out with a SATIMO Starlab. Furthermore the simulation of the antenna on a vehicle with near field sources is described.

Abstract. An electromagnetic solver comparison for various use cases of antennas mounted on vehicles is presented. For this purpose, several modeling approaches, called transient, frequency and integral solver, including the features fast resonant method and autoregressive filter, offered by CST MWS, are investigated. The solvers and methods are compared for a roof antenna itself, a simplified vehicle, a roof including a panorama window and a combination of antenna and vehicle. With these examples, the influence of different materials, data formats and parameters such as size and complexity are investigated. Also, the necessary configurations for the mesh and the solvers are described.

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