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Apparatus for Measuring Azimuth Gyro Drift

IP.com Disclosure Number: IPCOM000094639D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Beeble, RH: AUTHOR

Abstract

Accurate measurement of the drift rate of azimuth gyroscopes in vehicle navigation equipment is difficult because of the relative instability of the vehicle, even at rest. The usual techniques include stationary laboratory tests and involve removal of the equipment from the vehicle. The system shown provides accurate drift measurement prior to departure without removal of the gear from the vehicle.

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Apparatus for Measuring Azimuth Gyro Drift

Accurate measurement of the drift rate of azimuth gyroscopes in vehicle navigation equipment is difficult because of the relative instability of the vehicle, even at rest. The usual techniques include stationary laboratory tests and involve removal of the equipment from the vehicle. The system shown provides accurate drift measurement prior to departure without removal of the gear from the vehicle.

The inertial gear of the vehicle is arranged so that autocollimator theodolite 10 associated with ground-based test equipment 11 can be trained on mirror 12 carried by synchro 13 mounted on inertial platform 14. The synchro has two elements whose relative rotation is accurately indicated by the synchro's output signal. The element of the synchro which carries mirror 12 is free and the other is fixed to platform 14. Motor 15, controlled by interconnection with theodolite 10, drives the mirror carrying synchro element to maintain a fixed azimuth angle.

The azimuth gyro of the inertial system is left untorqued and the other two gyros are operated to erect platform 14 with respect to their axes. Platform 14 is thus allowed to drift in azimuth at a velocity which is the sum of the earth' s velocity and the azimuth drift of the gyro being calibrated. This total drift is measured by synchro 13 and transmitted to a second synchro 16 in test equipment 11. Synchro 16 is connected to repeat the rotation of synchro 13. It is used to drive...