4.1 Electromagnetic environment (EME)
The EME in which military electronics must operate and survive is extremely complex because of the higher powers of electromagnetic emitters and modulation techniques used. To assure that a system is not affected by its intended EME, it is imperative that the EME be considered during all phases of the life cycle. It is very difficult, if not an impossible, task to exactly describe the electromagnet environment which any system is certain to encounter. Thus, the approach to defining the electromagnetic environment should be to define a representative maximum electromagnetic environment to which the system can be subjected, that is, the maximum EME that can be encountered in each phase of a system's life cycle. It may also be necessary to project, from the state-of-the-art, the potential for generating EM energy which could intentionally or unintentionally perturb electronics and couple this with the representative maximum environment to yield a description of the total Potential threat. Projections of system usage to different platforms may also be necessary. Only after full awareness of the tactical electromagnetic environment can the development of detailed system specifications
begin to be addressed.
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Electromagnetic environments (EME) are becoming more complex and of higher intensity. Electromagnetic circuits are constantly being developed to operate with or process smaller signals. These technologies are in conflict in terms of susceptibility to electromagnetic interference (EMI) which could reduce operational capabilities. A major objective of this handbook guide is to provide program managers with the available guidance for the design of these systems to operate and survive in expected tactical electromagnetic environments so that EMI reduction techniques can be incorporated as early as possible in the design.
Electronic hardware for system development begin with components and circuits. Some components and circuits are inherently more susceptible to electromagnetic energy than are others. This handbook addresses items such as what the designer should be aware of, what methods of circuit protection are available, and how one determines what shielding is is needed in any particular application either between circuit and circuit, black box and black box, or between the external environment and the inside electronic system.