Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1995-06-06
1997-07-29
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342120, 342123, 342462, G01S 100
Patent
active
056525923
ABSTRACT:
An enhanced system for calculating the Z-Axis, or relative height or altitude, of a radio beacon. The present invention uses a barometric pressure sensing device co-located with the radio emitter to transmit data representing relative altitude. To further enhance the Z-Axis determination, one or several barometric sensors, located at known heights, are positioned around the city to provide real time barometric data. This real time data is used to form a differential correction factor which is compared to the to the time varying barometric sensor co-located with the radio emitter, thereby yielding Z-Axis accuracies of up to one (1) foot. Since the altitude essentially becomes a "known", this information can also be used in the least squares fit algorithm to enhance the X and Y determination as well. As an alternative to differential readings from "known" altitude barometric sensors, the X,Y position of the radio emitter itself, or a check-in by a user, can be used to determine times when the radio emitter is at a known altitude thus providing occasional positions for "self" correction. Further, a mobile barometric reference, with a known Z-axis, can be purposely brought in proximity of the unknown altitude transmitter by, for example, a search team to provide differential information. Lastly, additional radio techniques are taught to assist a mobile search team.
REFERENCES:
patent: 3082324 (1963-03-01), Schuck
patent: 4163216 (1979-07-01), Arpino
patent: 5117359 (1992-05-01), Eccles
patent: 5160933 (1992-11-01), Hager
patent: 5202684 (1993-04-01), Funatsu
Rouquette Robert E.
Sanderford H. Britton
Pham Dao L.
Sanconix, Inc
Tarcza Thomas H.
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