Design method of star sensor lens hood and star sensor

Abstract

The invention provides a design method of a star sensor lens hood and a star sensor. The design method comprises the following steps: determining a ground gas light suppression angle of the star sensor, imaging parallel lights of different incident angles which are larger than a half-field angle of a lens by a star sensor lens, analyzing an imaging gray value to obtain a lens stray light suppression angle of the star sensor lens, obtaining the half-field angle of the lens hood based on an actual image detector parameter, the lens stray light suppression angle and the ground gas light suppression angle, and obtaining the length and a clear aperture of a light-receiving end of the lens hood based on the clear aperture of the star sensor lens, the half-field angle of the lens hood and the ground gas light suppression angle. By adopting the design method provided by the invention, the problem that star point extraction is affected by the highlight of partial imaging area of a star sensor image detector due to the unreasonable design of the lens hood is effectively solved, and a sufficient basis is provided for the field angle design of the star sensor lens hood.

Description

technical field [0001] The invention relates to the field of stray light suppression for high-contrast optical imaging systems, and more particularly relates to a design method for a star sensor shading cover and the star sensor. Background technique [0002] As a high-precision and high-reliability attitude-sensitive measurement device, the star sensor has been widely used in current aerospace vehicles. The main principle of the star sensor is: using the law that the position of the star is basically stationary relative to the inertial space, the star map is obtained by photoelectric imaging of the stars in a sky area, and then the star map is processed and identified to obtain the measurement sensor optical axis in the inertial space. Pointing, the three-axis attitude of the spacecraft can be obtained through the conversion of the star sensor on the spacecraft installation coordinate system and the spacecraft attitude coordinate system; compared with other attitude sensors...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a star sensor hood design method and a star sensor that overcome the above problems or at least partially solve the above problems. On the basis of analyzing the stray light suppression performance of the star sensor lens and the image detector parameters, the solution The prior art does not involve the integrated design of the star sensor hood and the optical system, resulting in high-brightness imaging in some areas of the image detector, which seriously affects the quality of the star point extraction of the star sensor

Images