Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1998-01-30
2000-02-29
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
34235709, 342458, G01S 502, G01S 302
Patent
active
060314893
ABSTRACT:
A communications satellite communications system and method, where a communications satellite 10 can pass messages between a user terminal 44 and an earth station 38, as the communications satellite moves in an orbit 12 12' as indicated by arrow 46, comprises means for estimating the position of the user terminal 44, on the surface of the earth 14, relative to the nadir 50, by means of doppler shift measurements and propagation delay measurements between the communications satellite 10 and the user terminal 44. Where more than one communications satellite 10 is visible to the user terminal 44, combination means are employed using propagation delays to plural communications satellites 10, and/or recordal of the receipt times, by the user terminal 44, of timed broadcasts from one or more communications satellites 10 to determine the propagation delay between the one or more communications satellites 10 and the user terminal 44. In addition, delay signals from navigational satellites 142 can be processed by the user terminal 44 measuring the time of arrival of signals from the navigational satellites 142 and conveying the identity of the navigational satellite and the arrival time of the signal to the earth station, which calculates the position of the user terminal 44 and can relay an idication thereof back to the user terminal 44.
REFERENCES:
patent: Re35498 (1997-04-01), Barnard
patent: 5515062 (1996-05-01), Maine et al.
patent: 5548801 (1996-08-01), Araki et al.
patent: 5731785 (1998-03-01), Lemelson
patent: 5859612 (1999-01-01), Gilhousen
Search report GB 9702706.4 Mar. 10, 1997.
Goerke Thomas
Wyrwas Richard
ICO Services Ltd.
Issing Gregory C.
LandOfFree
User terminal positioning system and method employing external s does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with User terminal positioning system and method employing external s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and User terminal positioning system and method employing external s will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-687089