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Star sensor calibrating method based on star field

A star sensor and calibration method technology, applied in the field of aerospace measurement, can solve problems such as incomplete error fitting, large error, and unstable numerical calculation

Inactive Publication Date: 2007-11-14
BEIHANG UNIV
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Problems solved by technology

The first disadvantage of this method is that the 0th-order term is lost due to the star-vector subtraction, which makes the error fitting incomplete; the second disadvantage is that the algorithm has a strong dependence on the modeling method of the 2-dimensional polynomial, and the model If it is not good, the numerical calculation will be unstable, and the error will be large

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  • Star sensor calibrating method based on star field
  • Star sensor calibrating method based on star field
  • Star sensor calibrating method based on star field

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Embodiment Construction

[0067] The present invention will be described in further detail below. The method of star field calibration is needed in the on-orbit calibration of star sensors, the calibration of night sky shooting, and the calibration of the laboratory using star field simulators. Therefore, it is of practical significance to study a general calibration method based on star field. In the method of the invention, the attitude parameters and internal parameters of the star sensor are simultaneously estimated and calculated, and the attitude parameters and internal parameters of the star sensor are iteratively calculated by using the non-linear least square method and the collinear formula. It can be used not only in the on-orbit calibration process of star sensors, but also in night sky shooting and laboratory calibration, so the method of the invention has wide applicability. At the same time, since the method calibrates the attitude parameters and internal parameters of the star sensor at...

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Abstract

The invention belongs to aerospace measurement technology, and relates to the improvement of a star sensor calibration method. The steps of the invention are: establishing the attitude conversion matrix of the star sensor; establishing the distortion model of the star sensor; and estimating the least square parameter. The method of the present invention combines the attitude estimation process and the star sensor parameter calibration process at the same time, thereby eliminating the influence of the attitude error introduction on the star sensor parameters; it is widely applicable, not only can be applied to on-orbit calibration, but also can be applied to the night sky on the ground Observational calibration and in-lab star field calibration; good numerical stability.

Description

technical field [0001] The invention belongs to aerospace measurement technology, and relates to the improvement of a star sensor calibration method. Background technique [0002] The star sensor is an aerospace measurement instrument that uses star observation to provide high-precision attitude information for spacecraft. Its working principle is: the front-end camera unit of the star sensor uses the CCD (or CMOS) image sensor to capture the star map image, and obtains the barycenter coordinates and brightness information of the star image point through the image processing program, and then the star map recognition program uses these information in the Find the corresponding star in the navigation star library, and finally calculate the three-axis attitude of the star sensor. [0003] Star sensor calibration is generally divided into two methods: ground calibration and on-orbit calibration. Before the launch of the aircraft, the star sensor must first be calibrated and t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B64G1/36G01C21/02G01C25/00
Inventor 张广军郝雪涛江洁
Owner BEIHANG UNIV
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