Method and system of frequency stabilization in a mobile satellite communication system
US6356740B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1995 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Jun 30, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/18539
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention relates generally to satellite communication systems, and more particularly to a method and system for stabilizing transmission frequencies in a mobile satellite communication system. The preferred embodiment of the invention involves adjusting the transmit frequency of the gateway to account for a frequency shift from the reference frequency on the link between the gateway and the satellite. The preferred method of stabilizing the transmission frequency of a mobile terminal in a mobile satellite communication system involves receiving frequency offset information transmitted by a gateway in the mobile satellite system, and adjusting a reference oscillator in a mobile terminal based on the frequency offset information. The preferred embodiment of the system includes a plurality of mobile terminals, a satellite adapted to communicate with the mobile terminals, and a gateway in communication with the satellite. Each mobile terminal has a mobile terminal reference oscillator, and the satellite has a satellite reference oscillator. The gateway has a high-stability reference oscillator and a digital processor. The digital processor includes a routine for calculatin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.