Method for calibrating accelerometer by using orbit determination data

Abstract

Disclosed is a method to calibrate an accelerator through orbit determination data, which includes the following steps: make sure the zero offset calibration value of an accelerator before the satellite carry out trial orbit transfer and set the pulse equivalent calibration coefficient of the accelerator to 1; compensate the acceleration measured by the accelerator during the trial orbit transfer process; accumulate the velocity increment during the trial orbit transfer according to the compensated measured value by the accelerator; after the orbit transfer, calculate the pulse equivalent calibration value of the accelerator by velocity increment Delta V during the trial orbit transfer according to ground orbit measuring; during the orbit control process, compensate the accelerator measured value according to the obtained pulse equivalent calibration value and the zero offset calibration value of the accelerator before trial orbit transfer; calculate the velocity increment and compare the calculated velocity increment value with the orbit transfer velocity increment value before the orbit control, if the calculated velocity increment value is larger than the velocity increment value before orbit control, the orbit control can be stopped. If not, continue the execution from the orbit control process until the end.

Description

technical field [0001] The invention relates to a method for calibrating an accelerometer using orbit determination data, and is especially suitable for calibrating the accelerometer for satellites with key points or unique window orbit changing requirements. Background technique [0002] Accurate accelerometer measurement information is needed during the orbit control of the moon-flying spacecraft, and the accelerometer measurement itself contains zero position deviation and pulse equivalent error. If these deviations are not considered, it will cause errors in orbit determination. In order to ensure the accuracy of orbit control, the pulse equivalent error of the accelerometer needs to be compensated on the star. [0003] Many foreign scholars have proposed a variety of methods for the calibration of accelerometers used in CHAMP satellites, GRACE satellites, etc., using the energy conservation method for calibration is the most fast and easy, and there are also methods suc...

AI Technical Summary

Problems solved by technology

Considering that the pulse equivalent of the accelerometer changes with temperature and time, the pulse equivalent of the accelerometer calibrated only on the ground cannot accurately reflect the true deviation of the accelerometer

The calibration performed on the ground can only be used as a reference value for the pulse equivalent compensation of the accelerometer. It is more suitable for satellites with less strict requirements on the accuracy of orbit control implementation, but it is no longer applicable to satellites with strict requirements on the orbit control window such as lunar probes.

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