A Research On EMC Of Air-craft HF Station

Avionics system composition is complex, there are lots of various types of devices in the limited space, it is vulnerable to external influence of electromagnetic interference and weak to the on-board system reliability, security; at the same time they are the source for the external interference of electromagnetic radiation. Especially in modern aircraft, the widespread adoption of fax-type aircraft control systems and engine micro-computer control system, making the electromagnetic compatibility problem is not only related to the general system performance, but also gradually affect flight safety. Therefore, the electromagnetic compatibility of equipment (interference and interference) question is very prominent.In this paper, short-wave radio communications electromagnetic com atibility technology to short-wave radio equipment is the main of studv. Airborne electromagnetic compatibility, for example, is in-depth research and analysis of practical engineering value of the electromagnetic compatibility probems.Firstly, reviewed the development process of electroma etic compatibility, and profiled electromagnetic interference and electromagnetic ompatibility, described the content of electromagnetic compatibility resear, the basic principles of electromagnetic interference, the three elements of electromagnetic interference and so on. And analysis of the causes of electromagnetic compatibility, and gave the proposed EMI solutions and measures, include shielding, filtering, grounding, bonding, etc.On this basis, this paper, airborne equipment, for example, analysis of the airborne electromagnetic environment and causes of electromagnetic interference. Then through the short-wave radio airborne electromagnetic compatibility analysis for airborne electromagnetic compatible with the requirements of proposed short-wave radio airborne electromagnetic compatibility measure, there are electromagnetic compatibility processing solution, such as increase in pre/post selection device, the installation of power supply filter, cover and chassis fan openings gap. Finally, the author gives the actual four projects that successfully resolved the practical work of questions, which is from the design point of view and troubleshooting point of view of the role of electromagnetic compatibility respectively. Instance1,2,3starts from a given index, the short-wave radio to the electromagnetic compatibility design, tested and installed for testing the use of aircraft to meet the requirements; Example4, to prevent the phenomenon, the actual situation of the aircraft were analyzed, find the cause and source of interference, according to the principle of electromagnetic compatibility and eliminating the source of interference, the problem has been resolved. Short-wave radio for airborne electromagnetic compatibility testing and comparison, analysis the improved electromagnetic compatibility upgrade, test the practical application of results.This paper analyzes ideas and methods that solve the electromagnetic compatibility problems, and it has important reference value in airborne electronic equipment for electromagnetic compatibility engineering design.