SEPARATION OF MAIN AND SECONDARY INERTIAL MEASUREMENTS FOR IMPROVED LINE OF SIGHT ERROR OF AN IMAGING VEHICLE'S ISOLATED DETECTOR ASSEMBLY
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United States of America Patent
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Apr 30, 2013
Grant Date -
May 23, 2013
app pub date -
Nov 18, 2011
filing date -
Nov 18, 2011
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Abstract
The 6-axis position and attitude of an imaging vehicle's detector assembly is measured by mounting the detector assembly on a compliant isolator and separating the main 6-axis IMU on the vehicle from secondary inertial rate sensors on the detector assembly. The compliant isolator couples low-frequency rigid body motion of the vehicle below a resonant frequency to the isolated detector assembly while isolating the detector assembly from high-frequency attitude noise above the resonant frequency. The secondary inertial rate sensors measure the angular rate of change in yaw and pitch of the isolated detector assembly. A computer processes measurements of the 6-axis rigid body motion and the angular rate of change in yaw and pitch of the isolated detector assembly to estimate the 6-axis position and attitude of the detector assembly.
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