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The critical angle is about 55° for normal daytime ionization at a satellite frequency of 20 Mc and it is 83° for 40 Mc. For 108 Mc, the angle is greater than 90°, that is, signals from a satellite can be received at about 2° below the horizon. Occasional signals are received due to anomalous effects much farther away . Table I gives the values of i max for different frequencies as well as the maximum deviation of the incident ray from the geometrical angle of incidence % (Fig. 8). 7 Mc. The assumed satellite altitude is 1000 km.
Phys. , Silver Spring, Maryland. 3. Patton, R. B. Jr. (1960). Orbit determination from single pass Doppler observations. IRE Trans, on Military Electronics, MIL-4 (2-3), 336-344. 4. Newton, R. R. (1960). Tracking objects within the solar system using only Doppler measurements. In "Proceedings of the X th International Astronautical Congress, London, 1959" (F. ), Vol. 1, pp. 435-444. Springer, Vienna. 5. , and Reyssat, M. (1960). Effet Doppler et dérive de fréquence des satellites 1958 Beta 2 et 1959 Delta.
1959). Satellite Doppler measurements and the ionosphere. J. Atmospheric and Terrest. Phys. 13, 376-379. 38. Ross, W. J. (1960). The determination of ionospheric electron content from satellite Doppler measurements. / . Geophys. Research 65 (9) 2601-2615. 39. Singer, S. F. (1956). " Phys. Rev. 104, 11-14. 40. Badessa, R. , Kent, R. , Nowell, J. C , and Searle, C. L. (1960). A Dopplercancellation technique for determining the altitude dépendance of gravitational red shift in an earth satellite.