Title:
MEASURING THE PHASE OF RECEIVED SIGNALS
Document Type and Number:
WIPO Patent Application WO/2010/129297
Kind Code:
A3
Abstract:
The present disclosure relates to a method to determine the phase of a signal when transmitter and receiver circuits use separate clocks. A discrepancy between the separate clocks is determined, as is a correction factor between the separate clocks. The phase is determined using a measured time of arrival of the signal, the determined discrepancy, and the determined correction factor. A drift factor and an expected start time of a pulse sequence may be used to determine the discrepancy. A start time of a pulse within the pulse sequence is determined and used to determine the correction factor. The method works by either absolute synchronization of the separate clocks, or by making the measurements independent of clock synchronization.
Inventors:
SEYDOUX JEAN (US)
YANG LIBO (US)
KUCHENBECKER MARK (US)
TAHERIAN REZA (US)
LEGENDRE EMMANUEL (US)
YANG LIBO (US)
KUCHENBECKER MARK (US)
TAHERIAN REZA (US)
LEGENDRE EMMANUEL (US)
Application Number:
PCT/US2010/032606
Publication Date:
February 03, 2011
Filing Date:
April 27, 2010
Export Citation:
Assignee:
SCHLUMBERGER CA LTD (CA)
SCHLUMBERGER TECHNOLOGY BV (NL)
PRAD RES & DEV LTD
SCHLUMBERGER SERVICES PETROL (FR)
SCHLUMBERGER HOLDINGS
SEYDOUX JEAN (US)
YANG LIBO (US)
KUCHENBECKER MARK (US)
TAHERIAN REZA (US)
LEGENDRE EMMANUEL (US)
SCHLUMBERGER TECHNOLOGY BV (NL)
PRAD RES & DEV LTD
SCHLUMBERGER SERVICES PETROL (FR)
SCHLUMBERGER HOLDINGS
SEYDOUX JEAN (US)
YANG LIBO (US)
KUCHENBECKER MARK (US)
TAHERIAN REZA (US)
LEGENDRE EMMANUEL (US)
International Classes:
G01V3/18; E21B47/12; G01V3/26; G01V3/38; G16Z99/00
Foreign References:
| US4577150A | 1986-03-18 | |||
| US5999129A | 1999-12-07 | |||
| US4600994A | 1986-07-15 | |||
| US7292109B2 | 2007-11-06 |
Attorney, Agent or Firm:
FONSECA, Darla, P. et al. (200 Gillingham Lane Md 200-9Sugar Land, TX, US)
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