Fig. 4. Artist concept of Ground Test Program (GTP). occurs mainly at night. The ground site radar observes resultant parameters of the ionosphere and the middle atmosphere. Weather is also one of the experimental parameters. A rectenna, a pilot signal transmitter and a microwave detector matrix over the area of 10 km are required on the Ground Station. REFERENCES 1. L.M. Duncan and Wm. E. Gordon, lonosphere/microwave beam interaction study, Final Report, NASA Contract NASA-15212, Rice University, 1977. 2. L.M. Duncan and J. Zinn, lonosphere/Microwave Interactions for Solar Power Satellites, Final Report J-10-4306, Los Alamos Scientific Laboratory, 1978. 3. F.W. Perkins and M.V. Goldman. Self-Focusing of Radio Waves in an Underdense Ionosphere, J. Geophys. Res. 86, 606-608, 1981. 4. H. Matsumoto, Numerical Estimation of SPS Microwave Impact on Ionospheric Environment, Acta Astronautica 9, 1981. 5. N. Kaya, Space Chamber Experiments of Ohmic Heating by High Power Microwave From the Solar Power Satellite, Geophys. Res. Lett. 8, 1289-1292, 1981. 6. M. Nagatomo, N. Kaya, and H. Matsumoto, Engineering Aspect of the Microwave Ionosphere Nonlinear Interaction Experiment (MINIX) With a Sounding Rocket, Proc. 34th IAF Cong., Tokyo, 1983. 7. N. Kaya et al., Fundamental Experiment for the Future Solar Power Satellite by Sounding Rocket (MINIX): A System Description, Proc. 17th ISTS Cong., Tokyo, 1984. 8. S. Miyatake et al.. Fundamental Experiment for the Future Solar Power Satellite by Sounding Rocket (MINIX): Plasma Wave Excitation by Strong Microwave. Proc. 17th ISTS Cong., Tokyo, 1984. 9. W.F. Utlaut and E.J. Violette, A Summary of Vertical Incidence Radio Observations of Ionospheric Modification, Radio Sci. 9, 895-903, 1974.
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