Calibrating system and method of multi-view-field star sensor based on three-axis turntable

Abstract

The invention relates to a calibrating system and method of a multi-view-field star sensor based on a three-axis turntable. The calibrating system comprises the multi-view-field star sensor, the three-axis turntable, a single-star simulator and a data collecting device. The calibrating method comprises the following steps: step one, collecting data; step two, calibrating a pinhole model; step three, calibrating a complete model; step four, solving a structure parameter; and step five, evaluating a calibrating result. The calibrating method uses a generating angle of a rolling-rotating axis ofthe three-axis turntable to switch a data collecting view field, and uses the other two axes to generate a calibrating track for each view field. Data collection is completed by one time, so an outerparameter model in each view field calibrating model is kept unchanged, and the structure parameter between the view fields can be solved without being affected by an installing error. At the same time, according to an unchanged outer parameter, calibration of each view field can be joint-optimized, and the effect on parameter estimation precision caused by parameter coupling is reduced.

Description

technical field [0001] The invention belongs to the field of astronomical navigation, and in particular relates to a calibration system and method for a multi-field star sensor based on a three-axis turntable. Background technique [0002] Measurement accuracy is the key development direction of star sensor technology. Affected by angular resolution, the Euler angle error around the optical axis of a single-field star sensor is generally 6 to 16 times that of the other two axial Euler angle errors. Compared with the traditional star sensor, the multi-field star sensor can achieve three-axis equal-precision measurement output by fusing the measurement information of different fields of view; The observation information of the field of view can still guarantee the reliable output of the attitude; the sky area observed by the multi-field star sensor is generally larger, so the dynamic performance has been improved. [0003] The starlight vector or attitude information measure...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of large workload and low estimation accuracy of structural parameters in the "measurement model parameter laboratory calibration + structural parameter external field calibration" of the multi-field star sensor, and propose a multi-view sensor based on a three-axis turntable. Field star sensor calibration method

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