Method for correcting long-period attitude error of satellite based on ground control

Abstract

The invention discloses a method for correcting a long-period attitude error of a satellite based on ground control. The method mainly comprises three steps: step 1, calculating the initial values of the frequency and amplitude of the long-period attitude error based on the included angle of optical axes of star sensors; step 2, calculating an attitude correction amount by using a ground control point and an exterior orientation observed value; and step 3, fitting the long-period attitude error by using the initial values calculated in the step 1 and the attitude correction amount calculated in the step 2. The method can further improve attitude determination precision of star sensor-gyro combined treatment through detection and correction of the long-period attitude error of the satellite, which is beneficial for improving the global control-free mapping capacity of a mapping satellite.

Description

technical field [0001] The invention relates to the technical field of satellite attitude post-processing, in particular to a method for correcting satellite long-period errors based on ground control, which is applied to determine the absolute attitude of high-precision remote sensing mapping satellites. Background technique [0002] Since the combination of star sensor and gyroscope has the advantages of high precision and good reliability, this combination mode has been widely used in high-resolution remote sensing mapping satellites at home and abroad. Star sensors commonly used in combination mode include ASTRO series of Jena-Optronik in Germany and SED series of SODERN in France [Spot image, 2005. Pre-processing levels and location accuracy. Technical information.www.spotimage.com.; REDUCTION OF LOW FREQUENCY ERROR FOR SED36 AND APS BASED HYDRA STAR TRACKERS, Julien OUAKNINE(1), Ludovic BLARRE(1), Lionel ODDOS-MARCEL, Johan MONTEL(2), Jean-Marc JULIO(2), Proc.'6th Inter...

AI Technical Summary

Problems solved by technology

The design of this method is relatively ideal, ignoring the fact that in the process of satellite photogrammetry, due to factors such as manual measurement or automatic matching errors of landmark image points, calibration errors inside and outside the camera, and orbit determination errors, the accuracy of the reference vector calculated by the landmark points is not high. Joint filtering introduces interference error sources, which affects the accuracy of attitude filtering

In addition, domestic scholars have analyzed the influence of star sensor temperature on attitude measurement accuracy, mainly from the star sensor hardware, and analyzed the influence of temperature on device accuracy. However, due to the complexity of the thermal characteristics of satellites and star sensors, no temperature The specific quantitative relationship with the accuracy of attitude determination

[0009] It can be seen that the existing methods such as temperature control design optimization, lens distortion calibration, and increasing the number of stellar catalogs cannot eliminate low-frequency and long-period attitude errors. The method of eliminating low-frequency and long-period errors. Due to the existence of manual measurement or automatic matching errors of landmark image points, calibration errors inside and outside the camera, and orbit determination errors, the accuracy of the reference vector calculated by landmark points is not high. Instead, it introduces interference error sources into the joint filter. Affects the accuracy of attitude filtering and reduces the controlled positioning accuracy of satellite images

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