Accelerometer calibration method based on attitude information

Abstract

The invention discloses an accelerometer calibration method based on attitude information, relates to an accelerometer calibration method and belongs to the deep space detection technology field. In the invention, in order to carry out accelerometer calibration under the condition that position measurement information is lacked, an inertial navigation mode without a gyroscope is used to deduce an accelerometer output model; an attitude determination system output is used and a non-linear filtering method is combined so as to carry out accelerometer drift estimation; accelerometer drift and a corresponding error variance matrix are recalculated; the accelerometer drift and the corresponding error variance matrix are input into a nonlinear filter to estimate the accelerometer drift so that accelerometer calibration is completed, calibration precision is increased and then autonomous navigation performance of an atmosphere entering section is guaranteed. The invention aims at solving technical problems that accelerometer calibration precision of a planet approach section is increased under the condition that the position measurement information is lacked and the autonomous navigation performance of the atmosphere entering section is guaranteed.

Description

technical field The invention relates to an accelerometer calibration method, in particular to an attitude information-based accelerometer calibration method, which belongs to the technical field of deep space detection. Background technique The inertial navigation scheme based on the inertial measurement unit is the preferred way of autonomous navigation in the entry phase of the recent planetary landing exploration mission. Inertial navigation calibration during planetary approach is therefore a necessary step to reduce drift accumulation over time. The attitude determination system of the planetary approach section can use attitude sensitive elements such as star sensors and sun sensors to accurately calibrate the gyroscope, but the calibration of the accelerometer often depends on the position measurement information, and because the position measurement information of the planetary approach section detector Information is scarce, so the problem of accelerometer calibr...

AI Technical Summary

Problems solved by technology

Aiming at the problem of poor accelerometer calibration accuracy in the absence of position measurement information existing in the prior art

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