Communications: electrical – Continuously variable indicating – Using a particular modulation
Patent
1991-07-11
1992-12-22
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
Using a particular modulation
342389, 342453, G08C 1700, G08C 2100, G01S 1380, G01S 1386
Patent
active
051736900
ABSTRACT:
A passive ranging system for determining the slant range from a ground station to a drifting radiosonde. In one embodiment, the ground station receives meteorological data ranging and internal temperature signals from the radiosonde. The data signals are read out as ambient conditions of the atmosphere and the range signal is phase-compared to a reference signal at periodic intervals. Changes in frequency due to temperature fluctuations in the radiosonde components are factored into the phase-comparison, and the resultant change in phase represents movement of the radiosonde. In another embodiment the range tone from a remote broadcast station is retransmitted by the radiosonde and received at the ground station simultaneously with the same tone directly from the broadcast station. The phase lag is measured and coupled with measurements of direction from the ground station to the radiosonde, and with the distance between the ground station and the broadcast station for determining the slant range.
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The Loran-C Users Guide by Bonnie Dahl, published by Richardson's Marine publishing Inc. pp. 24-27, 32-37 and 40-41.
Fischer Robert W.
Friedman Maurice
Potts Luken W.
Rogers Gary
Ross Michael D.
Hill Andrew
Viz Manufacturing Company
Yusko Donald J.
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