Method of detection of a source of contact noises at wireless communication in motion

摘要

The article represents outcomes of development of the detection method of a source of contact noises in car structures which occur at wireless communication in motion. The detection method is based on defining the spatial orientation of radiating circuit, as well as on measuring its resonance frequency. Orientation of components of electromagnetic field of transmitter and receiver electric antennas, as well as orientation of components of radiating circuit field have been studied to achieve the purpose. The condition of having the maximal level of contact noises to be radiated by the circuit which is essential for its reliable detection was defined. In order to define equivalent size of radiating circuit a dependence of its resonance frequency as an electric oscillating system from circuit size, material of which components which form radiating circuit are made, from wireless signal carrier frequency has been established. During research the skin effect of current density distribution over the thickness of conducting elements of radiating circuit has been taken into account. The method requires no application of sophisticated apparatus and may be applied in the field. Radio stations installed in vehicles may be used as technical means of radiating circuit detection.