Inertial Measurement and Navigation System And Method Having Low Drift MEMS Gyroscopes And Accelerometers Operable In GPS Denied Environments
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United States of America Patent
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Issued Date -
Feb 18, 2016
app pub date -
May 3, 2013
filing date -
Apr 19, 2005
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Abstract
An inertial measurement unit includes physically distinct sectors positioned in groups of orthogonally oriented angle rate sensors on a different sector of a base having orthogonally oriented accelerometers positioned thereon. A processor receiving signals from the sensors and accelerometers calculates a change in attitude, position, angular rate, velocity, acceleration of the unit over a plurality of finite time increments, or a combination thereof. The gyros and accelerometers have low-drift measurement accuracy for operation in a GPS-denied environment by preselecting pairs of gyros for physical assignment to achieve low-drift accuracy, determining weights for the gyros to be combined in tiered pairs, preselecting the accelerometers for physical assignment in low-drift pairs, determining weights for accelerometer optimal low-drift pair combining in tiers, or a combination thereof.
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