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Joint estimation method for atmospheric refraction and ground attitude of ground-based star sensor

A star sensor and atmospheric refraction technology, applied in the field of star sensors, can solve problems that are difficult to be practical and cannot meet the requirements of real-time and optimality at the same time, and achieve high practicability and meet the requirements of real-time and optimality , Reduce the difficulty and the effect of system cost

Active Publication Date: 2021-10-19
BEIHANG UNIV
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Problems solved by technology

However, these methods cannot meet the requirements of real-time and optimality at the same time, so it is difficult to put them into practical use.

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  • Joint estimation method for atmospheric refraction and ground attitude of ground-based star sensor
  • Joint estimation method for atmospheric refraction and ground attitude of ground-based star sensor
  • Joint estimation method for atmospheric refraction and ground attitude of ground-based star sensor

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0031] The present invention provides a joint estimation method of atmospheric refraction and attitude to the ground of a ground-based star sensor, specifically, comprising the following steps:

[0032] In step S100, the star sensor takes a star map, and the matching relationship between the observed star and the reference star is obtained through star map recognition.

[0033] Specifically, the star sensor shoots the ob...

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Abstract

The invention provides a joint estimation method for atmospheric refraction and ground attitude of a ground-based star sensor. The method comprises the following steps: allowing a star sensor to shoot a star map, and obtaining the matching relation between an observation star and a reference star through star map recognition; converting the reference star to a geographic coordinate system according to the observation time and place to obtain the true zenith distance of the reference star; using a simplified atmospheric refraction model, the true zenith distance and the initial astronomical refraction coefficient for calculate an estimated astronomical refraction, and astronomical refraction compensation is carried out on the reference star; calculating the attitude of the star sensor to the ground, projecting the observed star weight to a geographic coordinate system, and calculating an observed astronomical refraction and an astronomical refraction error; and if the observed astronomical refraction and the estimated astronomical refraction do not coincide, adjusting the astronomical refraction coefficient according to the astronomical refraction error, re-compensating the reference star and calculating the attitude until the observed astronomical refraction and the estimated astronomical refraction coincide, and obtaining a joint estimation result of the atmospheric refraction and the to-ground attitude of the star sensor. The method realizes real-time autonomous estimation and elimination of atmospheric refraction of the star sensor, does not depend on an external sensor and is not constrained by an empirical formula.

Description

technical field [0001] The invention relates to the technical field of star sensors, in particular to a joint estimation method of atmospheric refraction and ground attitude of ground-based star sensors. Background technique [0002] The star sensor is an embedded sensing device that uses the star as a reference to obtain a three-axis attitude in space through star map photography, star point centroid positioning, star map recognition / tracking, attitude calculation and other processing steps. As the instrument with the highest attitude measurement accuracy at present, the star sensor has been widely used in various navigation carriers. The star sensors used by near-ground space carriers, such as missile-borne, airborne, and ship-borne star sensors, are collectively referred to as terrestrial star trackers. In order to achieve high-precision three-axis attitude measurement for this type of star sensor, it is necessary to overcome the problem of measurement error caused by st...

Claims

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Application Information

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IPC IPC(8): G01C21/02G01C21/20
CPCG01C21/02G01C21/20G01C21/025
Inventor 江洁杨季三田凌峰张广军
Owner BEIHANG UNIV
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