4 EFFECTS ON COMMUNICATION SYSTEMS 4.1 ELECTROMAGNETIC COMPATIBILITY 4.1.1 Methodology The radiated power and planned operating frequency of the SPS indicate the importance of the electromagnetic compatibility (EMC) evaluation relative to radio frequency systems and other susceptible electronic systems that operate within the continental U.S. and adjacent international areas. All electromagnetic emissions from the SPS (primary, harmonic, and spurious; and associated spatial patterns) are being assessed, with the goal of determining the spatial distribution of interference power densities as well as determining ionospheric and atmospheric media effects on the primary and sidelobe beam characteristics. Interference power densities are used to determine the character of performance degradation for radio frequency and electronic systems, scored relative to the ranges of signal-to-interference ratios possible over the operational geographical areas. A pictorial representation of the SPS and candidate interference problems in Fig. 4.1 indicates the scope of this investigation. Fig. 4.1. SPS Radio Frequency and Electromagnetic Interference
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