Multiple satellite mobile communications method and apparatus for hand-held terminals

• US 6,295,440 B2
• Filed: 11/30/2000
• Issued: 09/25/2001
• Est. Priority Date: 03/18/1999
• Status: Expired due to Term

• Current Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Original Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Inventors: Chang, Donald C. D., Chang, Ming U., Novak, John I. III, Hagen, Frank A., Yung, Kar, Mayfield, William
• Primary Examiner(s): Trost, William
• Assistant Examiner(s): PEREZ GUTIERREZ, RAFAEL
• Application Number:
  US09/726,644
• Publication Number:
  US 20010000167A1
• Time in Patent Office: 299 Days
• Field of Search: 455/430, 455/447, 455/13.1, 455/13.2, 455/12.1, 455/427, 455/502, 455/503, 370/316, 370/326, 375/211
• US Class Current: 455/13.1
• CPC Class Codes: H04B 7/18504 Aircraft used as relay or high altitude atmospheric platform
• CPC Class Codes: H04B 7/18506 Communications with or from aircraft, i.e. aeronautical mobile service
• CPC Class Codes: H04B 7/18532 Arrangements for managing transmission, i.e. for transporting data or a signalling message
• CPC Class Codes: H04B 7/18534 for enhancing link reliablility, e.g. satellites diversity
• CPC Class Codes: H04B 7/212 Time-division multiple access [TDMA]

Abstract

A novel mobile satellite communications technique for hand-held terminals includes a satellite system having a plurality of individual satellites all in communication with a ground telecommunications hub. A signal processed by the ground telecommunications hub is radiated through multiple paths to a plurality of the individual satellites in the satellite constellation simultaneously. The radiated signal is then re-radiated by the plurality of individual satellites to a mobile satellite terminal that receives the re-radiated signal from the plurality of individual satellites simultaneously such that the same frequency spectrum may be re-used by another mobile user.

Claims

1. A mobile satellite communications system for mobile users, comprising:

a satellite constellation having a plurality of individual satellites;

a ground telecommunications hub in communication with each of said plurality of individual satellites, such that a signal processed by said ground telecommunications hub is radiated through a plurality of paths to a plurality of said individual satellites in said satellite constellation for re-radiation by said plurality of individual satellites to arrive at a designated user location simultaneously, and a return signal from the designated user location is transmitted through a plurality of paths by said plurality of individual satellites to said ground telecommunications hub, so that the frequency spectrum of said signal is available for re-use by other mobile users for point-to-point communications, and

a mobile terminal, at the designated user location, for receiving said signal radiated from said plurality of individual satellites and arriving simultaneously for consequent coherent combination, and for sending said return signal.

2. The mobile satellite communications system of claim 1, wherein said ground telecommunications hub includes a processing center for receiving a plurality of signals and processing them to be transmitted to said plurality of individual satellites.

3. The mobile satellite communications system of claim 2, wherein said processing center includes apparatus for combining said plurality of received signals for transmission to said plurality of individual satellites.

4. The mobile satellite communications system of claim 3, wherein said processing center includes apparatus for amplifying said combined signals.

5. The mobile satellite communications system of claim 4, wherein said processing center includes apparatus for filtering said combined signals.

6. The mobile satellite communications system of claim 5, wherein said processing center includes apparatus for up-converting said combined signals.

7. The mobile satellite communications system of claim 6, wherein said processing center includes a beam former for forming multiple beams for transmitting signals to said plurality of satellites.