Modular Strapdown Guidance Unit with Embedded Microprocessors,
CHARLES STARK DRAPER LAB INC CAMBRIDGE MA
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The Low-Cost Inertial Guidance System LCIGS is a modular strapdown design implementation of attitude gyro and velocity accelerometer axes which permits the interchangeable use of different manufacturers instruments without affecting the systems electronic or mechanical interfaces or processing software. This design flexibility is made possible by the use of microprocessors for processing and control. The microprocessors effect on-line digital torque control of the gyros, active instrument error model compensation, including modeling for temperature sensitivity effects, temperature control, self-testing, etc. Adaptation of processing and calibration algorithms to accommodate for instrument changes or sensed environmental variations is achieved through the use of an alterable read-only data base that may be updated by the LCIGS support equipment as required at calibrations or upon an instrument replacement.