4.1 ELECTROMAGNETIC COMPATIBILITY 4.1.1 Scope The following are within the scope of this section: • An assessment of the electromagnetic compatibility (EMC) of SPS with electromagnetic (EM) receiver systems. • An evaluation of the EMC of electronic systems which would be degraded because of the high power of SPS. • Analysis of the implications of the induced degradation. 4.1.2 Methodology The potential EMC problem caused by the satellite power systems is recognized as one of the most critical in the SPS environmental assessment. Consequently, an aggressive program has been initiated to analyze the functional and operational degradation of electromagnetically sensitive systems (e.g., communication, radar and navigational systems, computers, sensors, electronic medical instruments and devices), because of SPS direct power coupling, and ionosphere and atmosphere media modification effects. These effects are depicted in Fig. 4.1. Primary evaluation areas include EM environment verification computations, coupling analysis, functional-operational priority categorization, degradation evaluations, and impact assessment. Subsequent tasks address mitigation methods for degraded systems, and guidelines for designers and planners of future systems. Information was obtained from NASA on the SPS reference design (Ref. 4.1.3 ), including: single microwave power transmission system radiation characteristics, geostationary earth orbit (GEO) locations for multisatellite operation, emission power spectra, sidelobe structure, and candidate rectenna sites. A model is being used to predict field strengths at and near the surface of the earth from SPS microwave emissions. Priority rectenna sites will be analyzed from the candidates identified by NASA and DOE (Ref. 4.1.4). Equipment and systems near the rectenna sites that are susceptible to SPS radiation are identified by selective retrieval from existing files, and
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