METHOD FOR INCREASING CALIBRATION ACCURACY OF UNIT OF ANGULAR VELOCITY MICROMECHANICAL SENSORS

摘要

FIELD: physics.;SUBSTANCE: invention relates to navigation, navigation instruments, testing and calibration and can be used to calibrate sensors of strapdown inertial systems for orientation and navigation of aircraft, sea, ground and other mobile objects. Method comprises an initial platform display, a static experiment, with the platform stationary, successive rotation using the bench equipment at least on two non-parallel axes in the calibrated integrated data base basis, recording of the reading of the integrated data base on the channel of linear acceleration sensors (LAS) and readings of angular velocity sensors (AVS). By identifying proposed nonlinear mathematical model of AVS, zero angles of angular velocity sensor, matrix describing scale factors, cross links, non-linear coefficients are determined, for this purpose calibration program is developed. Program includes execution of a sequence of rotations and inclination angles of the platform in accordance with 6 specified experiments with duration of rotation and platform inclination time interval of about 3–4 minutes. Processing of obtained data includes selection of time interval with duration of about 2–3 minutes with established angular speed and inclination angles, calculation of ADC AVS codes average values, differentiation of goniometer readings and calculation of average values of angular velocities of table platform, calculation of average values of temperature sensors readings. Further, using certain algorithms, calibration factors are determined. According to the proposed method, estimation of scales and non-orthogonality angles is performed together with shifts of zeros. This ensures invariance of estimates of scale factors and angles of non-orthogonality with respect to shifts of zeros of the AVS and, accordingly, high accuracy, which is important for micromechanical angular velocity sensors with high level of instability of zero shifts.;EFFECT: technical result is higher accuracy of calibration of scaling factors and angles of non-orthogonality of micromechanical angular velocity sensors.;1 cl, 5 tbl, 1 dwg