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
364449, G01S 502, G01C 2100
Patent
active
054123895
ABSTRACT:
A radio telecommunications/location system includes a number of locator satellites in low earth orbits. The satellites include multibeam antennas. Locatable subscriber units communicate with the satellites. A single subscriber unit communicates with a single satellite using electromagnetic signals so that measurement processors can obtain Doppler component, and propagation duration 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 comparing signals received at the subscriber unit through antenna beams projected to the left of the satellite's ground track with signals received at the subscriber unit through antenna beams projected to the right of the satellite's ground track.
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.
LandOfFree
Multibeam position ambiguity resolution does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multibeam position ambiguity resolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multibeam position ambiguity resolution will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1140711