Low-cost satellite communication system
US6396819B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Mar 21, 1998 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | Mar 21, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The satellite communication system has a ground station and multiple remote terminal units (RTUs). The RTUs are designed to infrequently transmit relatively short duration messages, and to repeatedly transmit the same message, so that it is received by a sweeping high gain satellite antenna. To minimize costs, the system is designed to allow the use of RTUs that use a fixed modulation scheme. Because the transmissions are infrequent and short, the loss of messages due to collisions is unlikely. As a further optimization, the RTUs have CDMA transmitters that each use the same CDMA code, and the ground station has multiple CDMA correlators using the same CDMA code. By using the same CDMA code, the loss of messages due to collisions is further reduced. For transmitting to the RTUs, the ground station has multiple CDMA modulators, each using a second CDMA code that is preferrably orthogonal to the first CDMA code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.