Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1993-08-11
1995-05-02
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
64449, G01S 502, G01C 2100
Patent
active
054123887
ABSTRACT:
A radio telecommunications system includes a number of locator satellites in low earth orbits. Locatable subscriber units communicate with the satellites. A single subscriber unit communicates with a single satellite using electromagnetic signals so that a measurement processor can obtain Doppler component, propagation duration, and real time measurements of the signals. A location processor converts these measurements into a two-position location solution. The two-position solution includes an actual position and an image position. The actual position may be detected in some situations by identifying a cell within which communications take place. In other situations, the actual position may be distinguished from the image position by detecting the eastward rotation of the earth. A service processor determines which qualifications to apply to communication services offered by the system. These qualifications are based on the subscriber unit's location.
REFERENCES:
patent: 4728959 (1988-03-01), Maloney et al.
patent: 4797677 (1989-01-01), MacDoran et al.
patent: 4860352 (1989-08-01), Laurance et al.
patent: 5119101 (1992-06-01), Barnard
patent: 5119504 (1992-06-01), Durboraw, III
patent: 5177489 (1993-01-01), Hatch
"Emitter Location Accuracy Using TDOA and Differential Doppler" by Paul C. Chestnut from IEEE Transactions on Aerospace and Electronic Systems, vol. AES-18, No. 2, Mar. 1982.
"Geolocation of Frequency-Hopping Transmitters via Satellite" by A. Sonnenschein and W. K. Hutchinson from Technical Report 900, Nov., 1990.
"Geolocation via Satellite: A Methodology and Error Analysis" by M. J. Shensa from Technical Report 1244, May 1988.
Hall Phillip E.
Handy Robert M.
Issing Gregory C.
Johanson Kevin K.
Motorola Inc.
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