Candidate Locations for SPS Rectifying Antennas 1977

The land use analysis shows a major use of forested land along with a significant use of crop, desert, marsh, and grazing lands. It also shows that 22 percent of the 69 rectennas are at least partially on Federal land. III. SEA SURVEYS A. Selection Criteria Based on 1976 population distribution [3] and 1974 electrical demand distribution data [2], all remaining rectennas should be placed east of the Mississippi River. However, the steady westward and southward shift in the center of population (125 miles west and 40 miles south in the period from 1940 to 1970 [13]) indicates a need for reevaluation. If these data are extrapolated to the year 2000, the center of population will be at approximately 92° W longitude and 38°N latitude or 40 miles south of Jefferson City, Missouri. Assuming that electrical energy demand is indeed proportional to population distribution (Fig. 3) and denoting the future center of population as the origin of a coordinate system, then 15 more rectennas are required in the Northeast quadrant and 16 more in the Southeast quadrant. Also, four more are required in the Northwest and 16 more in the Southwest quadrants. This information does not indicate where the population will aggregate in these quadrants, but data over the years from 1940 to 1973 [14] indicate that approximately 50 percent of the U.S. population has consistently lived within 50 miles of a coastline — either the Atlantic Ocean, Gulf of Mexico, Great Lakes, or Pacific Ocean. Because of this and the fact that the off-shore platform industry is continually making advancements which will be directly applicable to rectenna design, an attempt was made to put the remaining rectennas in the sea. The selection criteria for the sea sitings include minimization of rectenna impact on shipping channels and minimization of water depth impact on rectenna design [ 151. B. Comments on Each Quadrant As stated earlier, no rectennas will be located off the coast of Alaska. However, electrical demand in the state of Hawaii could reach a point where rectenna placement there would be desirable. A survey of the Hawaiian coastline, however, indicates that only a floating rectenna would be practical there due to the extreme water depth even right off of the shorelines. Because of this, no sites are identified in Hawaii.

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