Patent ID: 6895678
Filing Date: 2005-05-24
Classification: E21B,G01V

Abstract:
1. An omnidirectional borehole navigation system comprising: a housing for traversing a borehole; a gimbal system including at least one outer gimbal connected to said housing and at least one inner gimbal nested in and connected to said outer gimbal; a solid state three-axis gyro assembly mounted on said at least one inner gimbal; a solid state three-axis accelerometer assembly mounted on said inner gimbal; gyro logic circuits on said at least one inner gimbal responsive to said three-axis gyro assembly to produce the inertial angular rate about each gyro input axis; accelerometer logic circuits on said at least one inner gimbal to produce the non-gravitational acceleration along each accelerometer input axis; and a microprocessor responsive to said gyro logic circuits and said accelerometer logic circuits for determining the attitude and the position of said housing in its borehole.