METHOD FOR COMPENSATION FOR TEMPERATURE ERRORS OF INERTIAL MEASURING UNIT OF ORIENTATION AND NAVIGATION SYSTEMS Russian patent published in 2021 - IPC G01C21/00 

FIELD: instrument manufacture.

SUBSTANCE: invention relates to the field of precision instrumentation, primarily gyroscopic, and can be used in creation of inertial orientation and navigation systems. In the preliminary calibration operation, an inertial measuring unit is activated at the initial normal temperature thereof under conditions of constant normal ambient temperature, the electrical power consumed by the unit is measured and the transient characteristics of the sensing elements are found from the moment of the start of operation thereof during the time period wherein the temperature of the sensing elements reaches the steady state values, based whereon the order and coefficients of the transfer functions of the sensing elements are determined according to the electrical power. Then, at the steady state temperatures of the sensing elements of the operating unit, the ambient temperature is abruptly changed from the normal value to the value of the maximum plus temperature, and the transient characteristics of the sensing elements are determined during the period wherein the temperatures thereof reach new steady state values, based whereon the order and coefficients of the transfer functions of the sensing elements are determined according to the ambient temperature. The unit is then deactivated and the sensing elements thereof are consecutively brought to the steady state temperatures at discrete points of the working range of ambient temperatures, the unit is activated, and at said temperatures, the systematic errors and temperatures of the sensing elements are measured at the time of the beginning of operation thereof, the functional dependences of the errors of the sensitive elements on the temperatures thereof at the time of the beginning of operation are found based on the results. The differential equations of the dynamic models of temperature errors of the sensing elements from the effects of the electrical power of the unit and the ambient temperature are then determined based on the obtained transfer functions, and the temperature of the sensitive elements at the time of the beginning of operation thereof, the value of the electrical power consumed by the unit, the ambient temperature of the unit, are then determined in the working mode upon activation of the unit, and algorithmic compensation for the temperature errors of the sensing elements of the inertial measuring unit is conducted.

EFFECT: increased accuracy of compensation for temperature errors of the inertial measuring unit of orientation and navigation systems.

1 cl, 1 dwg