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Extending the range of a MEMS gyroscope using eccentric accelerometers

  • US 10,378,330 B2
  • Filed: 12/22/2016
  • Issued: 08/13/2019
  • Est. Priority Date: 12/22/2016
  • Status: Active Grant
First Claim
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1. A method of measuring a rotational position of a sensor in a tool in a borehole penetrating a formation, comprising:

  • using a gyroscope disposed on the tool to obtain a first measurement of a rotation rate of the tool;

    using at least one accelerometer disposed on the tool to obtain a second measurement of the rotation rate of the tool; and

    using a processor to;

    generate an estimate of the rotation rate of the tool using the first measurement of the rotation rate and the second measurement of the rotation rate, wherein the estimate of the rotation rate of the tool includes the first measurement of the rotation rate for those time periods during which the first measurement of the rotation rate is less than a threshold of the gyroscope and the second measurement of the rotation rate for those time periods during which the first measurement of the rotation rate is equal to or greater than the threshold, anduse the estimate of the rotation rate to determine the rotational position of the sensor during rotation of the tool.

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