A Correction Method for Starlight Atmospheric Refraction Measurement Based on Refractive Surface Collinearity

Abstract

The invention relates to a starlight atmospheric refraction measurement correction method based on collinear refraction surfaces, which is based on star vectors observed by star sensors and reference star catalogs for star map identification to obtain the matching relationship between observed stars and reference stars; The reference star vector is converted to the geographic coordinate system before entering the atmosphere to obtain the zenith distance and azimuth of the incident starlight; based on the collinear principle of the refraction surface, the imaging coordinates of all stars identified according to the star map and their azimuth before entering the atmosphere The position coordinates of the zenith direction on the imaging surface of the star sensor are obtained by optimizing the solution; according to the position coordinates of the optimal zenith direction on the imaging surface obtained by the solution, the coordinates of the image surface coordinates of all the observed stars identified are calculated using the trigonometric cosine formula Atmospheric refraction correction to obtain the corrected star coordinates; solve to obtain the attitude of the star sensor in the geographic coordinate system.

Description

technical field [0001] The invention relates to a method for measuring and correcting starlight atmospheric refraction based on collinear refraction surfaces, and belongs to the technical field of starlight atmospheric refraction correction in star sensitivity. Background technique [0002] As an important factor affecting the attitude measurement accuracy of the ground-based star sensor, the refraction effect of the atmosphere on the incident starlight is a key issue that restricts the high attitude measurement accuracy of the ground-based star sensor. Although astronomers have done a lot of research on starlight atmospheric refraction in the past few decades, the real-time and high-precision starlight atmospheric refraction correction has not been effectively solved in practical applications. [0003] There are two main types of existing atmospheric refraction correction methods. The first type is the atmospheric refraction fitting model correction method based on the the...

AI Technical Summary

Problems solved by technology

First of all, the refractive index of each incident direction in the actual earth's atmosphere is different, so the theoretical homogeneous layered spherical atmospheric model is isotropic and the properties of the medium are difficult to satisfy, and the accuracy of atmospheric refraction correction in the actual application process is difficult to guarantee

Secondly, these methods all need the help of other instruments to measure the propagation environment of starlight in the atmosphere, such as temperature, pressure, humidity, etc. These instruments add their measurement errors to the correction results in the process of correcting starlight atmospheric refraction, which will affect Accuracy of Atmospheric Refraction Correction

Finally, these methods do not have the ability to correct for atmospheric refraction of multiple stars with changing observation positions in real time with high precision

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