Power leveling telemetry system
US4868795A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1987 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Dec 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/223
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A seismic telemetry system with automatic power leveling is comprised of a command station (10) and a plurality of remote data acquisition units (14). Each of the DAU's (14) includes an antenna (18) for receiving commands and transmitting data and is connected to a T/R switch (34). Commands are received by command receiver (48) and entered into a system control (50). A power detect circuit (52) is provided for measuring signal strength of the received carrier and this information is compared to an internal reference in the system control (50) and the power output level of the transmitter (56) is adjusted. A transmit power detect circuit (60) is provided for measuring the actual power output by the transmitter (56). This measured power level is compared in the system control (50) with the internal references to determine if the actual power output is equal to the expected power output. If not, an offset is provided to adjust for any discrepancies. The command station (10) receives data from the DAU (14 ) by a data receiver (36). The power of the receive signal is detected by a power detect circuit (42). This information is input to a system control (40) for comparison with an intern…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.