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Gyro-stabilized single-axis platform

  • US 4,071,959 A
  • Filed: 03/23/1976
  • Issued: 02/07/1978
  • Est. Priority Date: 03/25/1975
  • Status: Expired due to Term
First Claim
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1. An instrument for measuring the direction of a borehole comprising a case having a longitudinal axis coincident, in use, with the axis of the borehole, a single-degree-of-freedom gyro comprising an outer gimbal mounted in the case with its axis coincident with the longitudinal axis thereof, an inner gimbal mounted in the outer gimbal with its axis coincident with the outer gimbal axis, a gyro rotor mounted in the inner gimbal, means for sensing angular movement of the inner gimbal relative to the outer gimbal and applying a torque to the outer gimbal to rotate it about its axis so that the inner gimbal precesses back to its initial position, means for measuring the angle of rotation of the case about its longitudinal axis relative to the outer gimbal and a gravity sensor unit for measuring three components of gravity in three non-coplanar directions.

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