Satellite communication system
US5414431A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 2, 1990 |
| Grant date | May 9, 1995 |
| Priority date | — |
| Expiry date | Jan 2, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/208
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A satellite communication system in which a satellite receives a signal on a uplink carrier frequency, frequency translates it, and transmits the signal at a downlink carrier frequency. The downlink carrier frequency differs from the uplink carrier frequency by a standard frequency offset and a frequency offset error. A terminal earth station transmits to the satellite an inbound signal on the uplink carrier frequency. A hub earth station continually transmits to the satellite an outbound signal on an uplink carrier frequency and receives from the satellite the outbound signal at the downlink carrier frequency. The hub strips the outbound signal from the downlink carrier frequency and compares the stripped downlink carrier frequency to the reference carrier. A frequency offset error signal corresponding to the frequency offset error is generated. The hub receives the inbound signal at the downlink carrier frequency, and adjusts the processing of the inbound signal in response to the offset frequency error signal to compensate for the offset frequency error. The invention allows the hub to have the characteristics of a Very Small Antenna Terminal characterized by low-cost, solid-sta…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.