K. Gaikovich, A. N. Bogaturov, A. Gurvich, S. Kashkarov, S.N. Krivonozhkin, B.M. Shevtcov, V. Ivanov, V.D. Freylikher
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Duct detection over the sea by TRANSIT measurements
The results of ship-borne measurements (16-th expedition of research vessel "Academician Nesmejanov") of signals from navigation satellites TRANSIT at two frequencies (150 and 400 MHz) are presented. It was discovered that besides the basic modulation related with direct and reflected beams interference there was additional modulation with lesser (2-20 times) period. This modulation was evidently related with signal reflection from strong refraction index peculiarities in the atmosphere above the sea. These layers have been observed simultaneously from radiosonde refraction index profiles. The simple four-beam model was found to be in good agreement with measurements data. It appeared possible to estimate the height of reflection layers by measurements parameters.
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