Method and system for transmitting radio signals between a fixed terrestrial station and user mobile terminals via a network of satellites
US5765098A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 8, 1996 |
| Grant date | Jun 9, 1998 |
| Priority date | — |
| Expiry date | Jul 8, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/2041
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention concerns a method and a system for transmitting radio signals between a fixed terrestrial station and mobile user terminals via a network of satellites in inclined circular orbits having a radius less than that of geostationary orbits. The beams generated are divided into pencil beams each associated with a continuous sub-band of frequencies in increasing frequency or decreasing frequency order. The instantaneous transmission frequency is offset progressively during the call towards the frequency subband of the adjacent pencil beam, at a rate proportional to the orbital rotation speed, to enable switching between pencil beams or between satellites. Applications include transmission via satellites in non-geostationary orbit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.