Arecibo is recommended for ,!D" layer illumination due to long term illumination requirement in excess of 10 minutes, h. Summary of Phased Array Antenna Orbital Test Hardware Figure K-11 illustrates the recommended antenna orbital test hardware to implement all of the currently defined primary and secondary objectives assuming objective H2 requiring high power density irradiation of the "D" layer for several minutes is implemented through the use of a ground based facility such as Arecibo (upgraded by an order of magnitude). Figure K-12 summarizes the relationships of altitude, range, and power densities. It identifies the objectives addressed in each case and indicates that those associated with irradiation of the "F" layer can be accomplished at altitudes as low as 391 km. It advises that the "D" layer irradiation be accomplished using the Arecibo facility (upgraded). The irradiation of the ground is low but probably sufficient. It should be pointed out that the acquisition and lock-on will be a difficult problem requiring further extensive investigation.
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