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On-orbit iterative calibration method for multi-error model of microsatellite magnetic sensor

A technology of magnetic sensors and micro-satellites, applied in instruments, measuring devices, navigation computing tools, etc.

Active Publication Date: 2014-07-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The problem of the technology to be solved by the present invention is to overcome the defects of the prior art, and to provide a method for on-orbit iterative calibration of the multi-error model of the micro-satellite magnetic sensor to improve the accuracy of navigation and positioning by simultaneously calibrating the zero offset error and the scale factor error

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] Such as figure 1 As shown, the present invention first uses the sun sensor and gyroscope to calculate the pitch angle of the satellite in the illuminated area, then uses the ground calibration or the scale factor error of the last measurement as a standard to calibrate only the zero bias error, and finally re-establishes the multi-error calibration Model, using the best fit method to re-calibrate the zero bias and scale factor errors. In the illuminated area, the output of the sun sensor and gyroscope is used as the observation of the pitch filter to estimate the pitch angle and angular velocity of the satellite, and the error of the magnetometer is estimated by using the output of the filter, and the estimated result enters the filter to measure and correct the magnetic field output.

[0039] 1. Analysis of Satellite Attitude Estimation Model

[004...

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Abstract

The invention discloses a two-step on-orbit iterative calibration method based on multiple parameters for a multi-error model of a microsatellite magnetic sensor. The method comprises the following steps: at first, calculating by utilizing a sun sensor and a top in an illumination area to obtain a satellite pitch angle; then, only calibrating zero-offset errors by using ground calibration or last-measurement scale factors as standard; and finally, re-building a multi-error calibration model, and re-calibrating the zero-offset and scale factor errors by using a best-fit method. According to the method, the zero-offset and scale factor errors of a magnetometer are calibrated and compensation in an attitude algorithm is carried out, so that the navigation accuracy of the satellite is effectively improved; a new filter does not need to be designed for a calibration algorithm, real-time calculation is also not needed, so that the operation cost and the load of the satellite are effectively reduced.

Description

technical field [0001] The invention relates to an on-orbit iterative calibration method for a multi-error model of a micro-satellite magnetic sensor, in particular to a multi-parameter-based two-step micro-satellite magnetic sensor multi-error model on-orbit iterative calibration method. Background technique [0002] Magnetometer is the main component of micro-satellite attitude measurement, and the measurement accuracy of magnetometer is an important index that affects the performance of micro-satellite attitude determination. [0003] The satellite's residual magnetic interference is the main error source of the on-board magnetometer. The methods to control and remove the residual magnetic interference mainly include: (1) Magnetic compensation method. The method of combining residual magnetism measurement and compensation before launching is to control the residual magnetism, but this method has limited effect. After magnetic compensation, the residual magnetism is genera...

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Application Information

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IPC IPC(8): G01C21/20
CPCG01C25/00
Inventor 华冰康国华吴风喜邵珠君郁丰吴云华陈志明沈萍程月华叶伟松
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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