Communications: electrical – Continuously variable indicating – Using a particular modulation
Patent
1990-02-23
1992-04-21
Weldon, Ulysses
Communications: electrical
Continuously variable indicating
Using a particular modulation
73170R, 342118, 342127, G08C 1700
Patent
active
051072610
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.
REFERENCES:
patent: 2910683 (1959-10-01), Todd
patent: 3339202 (1967-08-01), Earp
patent: 3384891 (1968-05-01), Anderson
patent: 3643259 (1972-02-01), Entner
patent: 3769589 (1973-10-01), Buntschuh et al.
patent: 3789409 (1974-01-01), Easton
Fischer Robert W.
Friedman Maurice
Potts Luken W.
Rogers Gary
Ross Michael D.
Viz Manufacturing Company
Weldon Ulysses
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