Apparatus and method for network level synchronization in multiple low earth orbit (LEO) satellite communications systems
US9973264B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2017 |
| Grant date | May 15, 2018 |
| Priority date | — |
| Expiry date | Aug 28, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/185
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method for synchronization of user terminal (UT) uplink data transmissions to a satellite in a satellite communications system is provided. The UT tracks frame timing and frequency of downlink data transmissions received by the UT from the satellite. The UT estimates a respective timing delay and frequency shift of the downlink data transmissions based on the tracked frame timing and frequency of the downlink data transmissions. The UT receives satellite ephemeris data broadcast by the satellite. The UT synchronizes uplink data transmissions to the satellite based on the estimated timing delay and frequency shift of the downlink data transmissions, the received satellite ephemeris data, and knowledge of a UT position and velocity vectors associated with any movement of the UT.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.