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

By H.A. Whale

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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.

Lld be recei ved everywhere on the earth in this idealized case. There are a number of ways in which maps are designed so that it is particularly easy to draw great circles on them. This problem is, of course, a long-standing one since a great circle is the shortest distance on the surface of the earth between two points and is thus usually the quickest route for a ship or an aircraft to follow. The most common map of the world is drawn on Mercator's projection which, although showing the shape of the continents fairly accurately, shows areas with increasing exaggeration as the distance from the equator increases.

1a the receiver will usually be not far distant from the absorbing stop Le. thc angular distance between the virtual transmitter at E and the receiving point will be small so that, using fig. 6, it is seen that the direction of the received signal will not vary very much from the directions of the edge E of the stop. In making this deduction, we have noted, from fig. 6, that the direction of the maximum of the probability distribution is not displaced very far from the ßI'oat circle direction to the transmitter (in this case the virtual transmitter) when the angular distance frou the transmitter to the receiver is less than about 90°.

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