Satellite data transmission and receiving station
US4876737A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1986 |
| Grant date | Oct 24, 1989 |
| Priority date | — |
| Expiry date | Nov 26, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/18517
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A satellite signal identification system utilizes distinguishable unique coded identifiers impressed on a carrier sent from a transmitting ground station to be identified. The identifier is recieved and identified by the receiving station to specifically identify a particular underlying carrier signal for reception. The invention utilizes a data modem for transmitting to an earth relay satellite coded identification signals together with various data and error correcting information. An IF carrier signal may be combined with video and/or audio signals, such combined signals being relayed via satellite to the ground station. The MPU of a modem in the ground station finds its counterpart in the MPU of the downconverter that receives via a block downconverter the data, housekeeping and ID signals after the video has been removed. The downconverter first translates the satellite transponder frequency to an IF frequency and sequentially searches for a carrier and the PSK code. The MPU establishes bit sync using the PSK carrier and then searches for the ID signal. The downconverter frequency sweeps to locate a new carrier if the desired ID is not found. Once the desired ID is detected th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.