Download Effects of Ionospheric Scattering on Very-Long-Distance by H.A. Whale PDF

By H.A. Whale

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features a myriad of illustrations, homework difficulties, references, and numerical examples

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Additional resources for Effects of Ionospheric Scattering on Very-Long-Distance Radio Communication

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This drum rotates with the mast and the record is obtained by pressing a typewriter ribbon on to the paper with a marker bar which is solenoid-opera ted. 10. It may be mentioned here that, as can be seen immediately from this record, a satellite produces a ~ery distinctive type of pattern. This arises, of course, from the fact that the satellite is moving very rapidly compared with any ground-based transmitters or any natural or man-made sources of interference. It has been found that the distinctive nature of the records can be extremely useful in identifying those times when signals from satellites are being received.

The parameter N specifies the sharpness of the distribution since the standard deviation is given by e+öe a = l/I2N. Note that a small value of N implies a large a and hence a rather broad flat curve for p( e) and a large N implies a narrow sharply peaked curve. Consider a wave which is propagating around the earth in aseries of hops between the earth and the ionosphere. Neither the earth nor the ionosphere is a perfectly smooth reflecting surface so that there will be some deviation of the wave from its great circle direction at each reflection point.

L " '1. (JA \. 'r)r ~ '1 .... ,.... '~~; ..... SEAGROVE - 1962 Fig. 7 Elevated beam rotating inte~ferornete~. In this example, the antenna spacing is 40 met~s. 27 MEASUREMENT OF ANGLE-OF-ARRIVAL The great disadvantage of the system arose in fact from the excellent control of the track followed by the moving wagon provided by the steering mechanism described above. Since the wheels followed almost exactly the same path (within about on most occasions) on each orbit (as it were) the roadway was subjected to repetitive loads in a manner which is not encountered on highways, for example.

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