Abstract:With the development of integration of the electronic equipment on missile, due to the functions of microcomputer and satellite navigation module couples close in a small space, multi-source multi-frequency band signals interference with each other, which sometimes caused that the navigation equipment cannot be accurately positioned. To solve the problem, this paper studys systematically the electromagnetic interference (EMI) control methods for the integrated electronic equipments on missiles. Firstly, the electromagnetic radiation and harmonic interference characteristics of switching power supply and isolation devices in the circuit. Secondly, based on the electromagnetic wave propagation principle in metal media, electromagnetic shielding finite element model is established by COMSOL software, the influence of shield’s conductivity, thickness, openings and other key factors on the shielding effectiveness are analyzed. Then comprehensive approaches to EMI management such as key component design and terminal antenna shielding are proposed. Finally, a set of integrated electronic equipment is test and the results show that the interference signal intensity is reduced, the equipment positioning speed success rate is increased by 85%, verifying the scientific rationality of the proposed methods.
