From 2.45-2.69 GHz in addition to radio location, there are broadcasting satellite and fixed satellite assignments. Again, sensitive equipment would be vulnerable to SPS emission particularly for satellites in geosynchronous orbit since the receiving attennas would be oriented more-or- less towards the SPS. From 2.7-5.0 GHz are assignments to aeronautical radio navigation, radio locations, maritime radio navigation, fixed satellite, radio astronomy, meteorological telemetry and other sensitive systems which again are subject to severe compatibility problems with SPS. Errors induced by SPS emissions into radio navigation systems can range from intermittent operation to limited position accuracy to total inability to determine position, depending on the type of system and the distance from SPS main beam. Most probably International Radio Consultative Committee (CCIR) and International Telecommunications Union (ITU) standards cannot be met for such systems within a 200-km radius of an SPS site. Air traffic control communications, radar, and radio navigation aids have very strict interference regulation and standards. Because of safety sensitivities, all interference must be carefully controlled. At frequencies below about 1 GHz, and with receivers that are well designed, as are most FAA and aircraft receivers, degradation may not be serious until within 50 km of the rectenna site. Above 1 GHz serious problems may occur. Surface communications within 100 km of the rectenna may be a problem unless very good receiver design is used. Many receivers will suffer from intermodulation problems at the millivolt-per-meter field intensities produced by SPS. For communications, noise and error effects will be serious for ultrahigh frequency (UHF) through microwave receivers. Surface resolution, degradation of target lock-on features, degradation guidance and control characteristics, etc. will be problems. Tests are under way to determine the problems in a number of minicomputers and modular components. Previous experience indicates unacceptable control and data performance for large illumination levels without special shielding and grounding methods. Peripheral and processor modules have a similar range of responses for pulse and continuous wave illumination. The medical electronics area has limited information for possible interference effects. A number of companies design equipment to operate
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