Accession Number : AD0877844

Title :   Electrostatic Gyro Drift Rate Compensation Study.

Descriptive Note : Final rept. Mar-Sep 70,

Corporate Author : AUTONETICS ANAHEIM CA

Personal Author(s) : Andrews, A. P.

Report Date : NOV 1970

Pagination or Media Count : 171

Abstract : The Micro-Electrostatic Gyro (MESG) is a whole-angle two-axis instrument which is suitable for strapdown applications. The rotor of the MESG is a 1 cm solid beryllium sphere. Electrostatic bearing torques cause the rotor spin axis to drift in inertial space. A mathematical model of the drift rate had been derived under a previous contract. The purpose of the present contract was to evaluate the accuracy of the model in predicting MESG drift rates. Drift rate data was used for determining the coefficients of the model, and the calibrated model was used for predicting MESG drift rates. The predicted drift rates were compared to actual drift rates. A total of 17 tests was conducted with two MESGs. Other special tests were conducted for evaluating the magnitudes of individual error sources. The statistics of all tests were used for determining the drift rate model accuracy. The rms drift rate errors were approximately 0.05 deg/hr/axis for the tests conducted. (Author)

Descriptors :   (*GYROSCOPES, CALIBRATION), (*SUSPENSION DEVICES, ELECTROSTATIC FIELDS), (*INERTIAL GUIDANCE, PREDICTIONS), DETECTORS, SAMPLING, ELECTRODES, ROTATION, PHASE MODULATION, INDUCTION MOTORS, TORQUE, ELECTRIC DISCHARGES, VACUUM PUMPS, CAPTIVE TESTS, MATHEMATICAL PREDICTION, ACCURACY, DRIFT, MATHEMATICAL MODELS, ERRORS, BERYLLIUM, SPHERES, ANALOG-TO-DIGITAL CONVERTERS, PHASE MEASUREMENT.

Subject Categories : Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE