Development and Analysis of a Linear Model of Contact Interference in Radio Reception

Among all classes of unintended electromagnetic interference, contact noise is the most unexplored. Contact interference refers to the class of interference caused by the electromagnetic field of a radio transmitter in the near field on conductive mechanical contacts with non-linear and time-varying electrical resistance or on variable contacts that are re-emitters (secondary emitters) of an electromagnetic field. The presence of such contacts forming the system is characteristic of a moving object (ship, car, tank, plane, train, etc.), on which transmitting and receiving radio electronic means (EM) operate. During the operation of the transmitter, contact interference affects the receptor mounted on the same moving object, and, as a rule, this influence is greater, the greater the speed of the object, which indicates a direct dependence of these interference on vibrations and mechanical shocks that affect the change in contact density. The paper presents the results of theoretical studies of the processes of formation and propagation of contact radio interference using an example of a linear model of the formation of contact radio interference.