Communications: electrical – Selective – Having indication or alarm
Patent
1979-04-06
1981-11-10
Groody, James J.
Communications: electrical
Selective
Having indication or alarm
73170R, 340601, 343 7ED, G08G 100, G08G 107, G11S 1395, G01W 100
Patent
active
043001211
ABSTRACT:
A warning system for traffic routes at an avalanche danger hillside is provided wherein the hillside ground is divided in an assumed avalanche falling direction, thus into a series of areas which are e.g. about 30 meters wide. These areas each have at least one associated indication device with an electronic signal output, and the signals of the indication device are fed to a memory which, for a downhill correct sequence of the signals, energizes an avalanche alarm and releases the alarm when, by virtue of the stored experience data, there is no longer a risk below the avalanche area. The indication devices receive an electronic signal output of a receiver for the reflected waves of at least one radar transmitter, and these signals from the indication device are fed to an electronic logic circuit which, for a downhill correct sequence of the signals energizes and releases an avalanche alarm in accordance with the snow movement on the hillside.
REFERENCES:
patent: 3491358 (1970-01-01), Hicks
patent: 3775766 (1973-11-01), Gendreu et al.
"Electromagnetic Sounding . . . Glaciers", Soviet Physics, vol. 16, No. 6, Dec. 1971, pp. 1022-1030.
Groody James J.
Smith, Jr. John C.
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