Method for correcting the phase of electromagnetic data
US8121789B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2007 |
| Grant date | Feb 21, 2012 |
| Priority date | — |
| Expiry date | Feb 22, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/083
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method for identifying, determining and correcting source-related phase errors in data from a controlled source electromagnetic survey by using data from ordinary survey receivers, i.e. without benefit of source monitoring data. Abrupt anomalies indicating source malfunctions are identified (71) in the time domain by plotting time intervals between neighboring zero crossings or by zero-lag cross correlation between consecutive bins of receiver data, and the amount of the time error (73) can be determined by performing cross correlation between two bins on either side of an anomaly. In the frequency domain, transmitter anomalies can be identified by looking for discontinuities in plots of phase vs. offset, and the corrective phase shift can be determined by matching the phase on one side of the anomaly to that on the other side. A global time/phase shift (76) can be determined by using phase frequency-scaling behavior at near offsets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.