ALGORYTHMIC COMPENSATION OF THERMAL ERRORS OF SENSORS OF AN STRAPDOWN INERTIAL UNIT

Currently strapdown inertial units (SIU) and navigation systems without temperature control systems are increasingly used in gyroscopy in order to reduce their mass-dimension characteristics and power consumption, and to minimize the readiness time. To provide acceptable accuracy of the system in a wide temperature range of an equipment compartment, algorithmic compensation for the thermal errors of sensors and electronic units is introduced [1]. A SIU without thermostabilization is currently developed at the Research Institute of Applied Mechanics named after Academician V. I. Kuznetsov. The system is designed to measure increments of the projections of the object's vectors of angular rate of rotation and linear acceleration on three mutually orthogonal axes of the body frame during the sample time and to transfer the information to the aircraft navigation system. The sensors of the system are quartz pendulum torque-to-balance accelerometers [2,3] and dynamically tuned gyroscopes (DTG) [3,4].