External field measurement method for star point mass center position precision of star sensor

Abstract

The invention discloses an external field measurement method for star point centroid position precision of a star sensor. Matched star point centroid coordinates and corresponding right ascension and declination coordinates are obtained through an external field star observation experiment of the star sensor; the star point centroid coordinates, the optimal principal point and the focal length value are used to calculate a star diagonal distance measurement value; calculating is carried out by using the corresponding right ascension and declination coordinates to obtain a star diagonal distance theoretical value; then, the star diagonal distance error can be calculated; the relationship between a star diagonal distance error and a star point mass center position error is deduced theoretically on the basis; and finally, the position precision of the mass center of the star point is calculated, and a reliable evaluation means is provided for evaluating the position precision of the mass center of the star point of a high-precision matching type star sensor and a small-field-of-view single-star tracker. The error caused by utilizing a single-star simulator and a parallel light tube to simulate the starlight of a fixed star in a laboratory is reduced, so that the measurement and evaluation of the star point mass center position precision of the star sensor are more accurate.

Description

technical field [0001] The invention belongs to the technical field of star sensor measurement, and in particular relates to an external field measurement method for the position accuracy of a star point centroid of a star sensor. Background technique [0002] The celestial navigation system has the advantages of high precision, strong autonomy, and no cumulative error, and is favored by multi-field, multi-platform navigation systems such as aviation, aerospace, and navigation. The star sensor is a high-precision celestial navigation attitude measurement device that takes stars as the observation object, and has been widely used in various satellites, ships and other platforms. [0003] The attitude measurement accuracy of the star sensor is usually evaluated by the attitude angle accuracy, which is the most direct index to evaluate the attitude accuracy of the star sensor. This indicator is related to factors such as the position accuracy of the star point centroid, the nu...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the deficiency of the existing star sensor for measuring the position accuracy of the center of mass of the star point, and to provide an experimental measurement method for the position accuracy of the center of mass of the star point, which can solve some special requirements Accurate measurement of star point centroid position accuracy of star sensors (very high precision, long focal length, various working bands), and then provide a reasonable evaluation method for the detection performance of all types of star sensors

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