System for compensating for cross polarization coupling
US4146893A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1977 |
| Grant date | Mar 27, 1979 |
| Priority date | — |
| Expiry date | Nov 15, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/002
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system for compensating for cross polarization coupling in a dual-polarization satellite communication system, in which two polarized waves of the same frequency and orthogonal to each other are alternately transmitted as a pilot wave from an earth station at a predetermined period. The same polarized wave components of the two signals received by a communication satellite are sent back to the earth station, so that the sent back signal is received by the earth station. An amplitude ratio and a phase difference between the same polarized wave components of the two signals of the received pilot signal are detected. A communication signal wave to be transmitted from the earth station is formed as an elliptically polarized wave by the use of the detected information, thereby compensating for cross polarization coupling of the communication signal wave caused during propagation between the earth station and the communication satellite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.