System using spread spectrum modulation for locating underground objects
US6211807A · kind A · utility
31Cited by
20References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 26, 1999 |
| Grant date | Apr 3, 2001 |
| Priority date | — |
| Expiry date | May 26, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The location of underground objects such as pipes and conduits are located by detecting electrical signals emitted by the underground objects where the radiated signals include spread spectrum modulated RF signals. The system can operate in a passive or active mode, and in the active mode pseudo-noise (PN) generators can be employed or frequency-hopping can be employed. The use of spread spectrum minimizes or eliminates conflicting signals radiated from a plurality of underground objects and can improve signal to noise ratio of the detected signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.