Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1994-02-28
1994-12-20
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
455 541, G01S 302
Patent
active
053749367
ABSTRACT:
A security system provides accurate positioning, in a two or three dimensional coordinate system, of an alarm signal transmitter which emits an alarm signal upon activation by a user. The security system includes at least three relay stations, at least one portable signal transmitter, and a central station. The alarm signal from the signal transmitter is received by the relay stations at different time intervals or with different intensities. The time or intensity data are then sent to the central station for processing, wherein the coordinates of the signal transmitter are quickly determined by solving a set of equations based on these data. The accuracy of the coordinates of the signal transmitter depends on accuracy of the measured time or intensity data.
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Encyclopedia excerpt entitled, "LORAN", based upon material from Bibliography: J. A. Hall, "Radar Aids to Navigation", 1947,; J. A. Pierce, A. A. McKenzie, and R. H. Woodward, Loran, 1948; P. C. Sandretto, "Electronic Avigation Engineering", 1958.
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