Method for quantitatively analyzing roundness of star-like defocused spot generated on star sensor optical lens

Abstract

The invention relates to a method for quantitatively analyzing the roundness of a star-like defocused spot generated on a star sensor optical lens. The method comprises the following steps: (a) obtaining a diagram showing the energy distribution of the defocused spot generated on the working surface of the star sensor optical lens; (b) calculating total energy of the defocused spot according to the diagram showing the energy distribution of the defocused spot; (c) calculating the centroid position, containing the total energy, of the defocused spot; (d) drawing a closed energy contour in the diagram showing the energy distribution of the defocused spot, and calculating a roundness error of the defocused spot. The method can not only meet the requirement for image processing for the star sensor, but also effectively reflect the aberration distribution of the star sensor optical lens; the method can be utilized for quantitative evaluation of the design result of the star sensor optical lens and performance index detection; the method is simple in principle, clear in requirement, and high in operability.

Description

technical field [0001] The invention relates to a method for analyzing the circularity of the diffuse spot of the optical system of a star sensor. Background technique [0002] The star sensor is mainly used for star positioning and aircraft space attitude confirmation. The principle is that the light emitted by the star in the instantaneous field of view is imaged on the receiving target surface of the star sensor through the optical system, and then the image is processed and the star table is fitted and corresponding The software algorithm is used to obtain the inertial coordinates and instantaneous attitude of the aircraft. The optical system is the core component of the star sensor, which directly affects the performance accuracy of the star sensor. The optical system of the star sensor is different from the requirements of the general imaging objective lens. It is required that the diffuse spot of the star point image has good roundness, which is beneficial to the cal...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problem of the lack of quantitative analysis method for the roundness of the existing diffuse spot, the present invention provides a quantitative analysis method for the roundness of the diffuse spot of the star sensor, which makes this index quantitatively controllable, and provides a basis for the design of the optical lens of the star sensor. and provide basis for testing

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