Satellite communications system incorporating ground relay station through which messages between terminal stations are routed
US4135156A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1974 |
| Grant date | Jan 16, 1979 |
| Priority date | — |
| Expiry date | Jun 20, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/2045
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A satellite relay communications system includes a ground relay station arranged so that each message from one subscriber to another is relayed by the satellite relay to the ground relay, processed by the ground relay and then transmitted to the second subscriber by way of the satellite relay. Processing at the ground relay station includes a switching function in which the carrier frequency of each message is changed from the frequency used for transmitting by the subscriber sending each message to the frequency used for reception by the subscriber to whom the message is addressed. This permits each subscriber to use a single transmitting frequency and a minimum number of receiving frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.