On the Influence of Scattering From a Power-pole on an Airport Radar
Abstract: Power-poles are one of the common massive conducting structures in cities and countryside. To fulfill the remarkable increased electric power demand nowadays, the number and the size of power-poles are also growing over the past few decades. The influence of power-pole on electromagnetic wave propagation is a potential noise source for nearby radio devices like radars. This master thesis project is aiming to analysis the interference of a case where an Amplitude Modulated (AM) signal emitted. We consider here the Stockholm Arlanda Airport’s Very High Frequency (VHF) Omnidirectional Range (VOR) radar scattering by a power-pole 2.6km away.A Method of Moment technique is used to solve the scattering problem. We modeled the power-pole on a blueprint from Svenska Kraftnät. It is meshed in small triangles by AutoCAD and GMSH software, and on that mesh the Rao-Wilton-Glisson (RWG) basis function are formed. A MoM code developed by Makarov determines the bi-static scattering pattern of the power-pole. Four main models have been considered, a one-side power-pole model and the same model with the ground plane, as well as two sides power-pole model and the model with the ground plane. We have assumed that the incident field on the power-pole is a plane wave and that the ground is an infinite PEC surface. The result is presented by the Interference to Signal ratio (ISR) of an airplane receiver when it is flying toward the airport for landing.By the end of the project, we have shown for the considered model that a 50 15dB level of interference is estimated for the interference to signal ratio. This result then suggests that a power-pole may have a little signal interference towards the VOR system radar wave emit awayfrom 2.6km.
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