Stationary satellite imaging yaw guidance angle calculating method

Abstract

The invention discloses a stationary satellite imaging yaw guidance angle calculating method. The stationary satellite imaging yaw guidance angle calculating method comprises the following steps: calculating a component of a unit vector pointing to a north pole direction, of an instant true equatorial plane normal in an inertial coordinate system according to an earth reference system transformation relationship; calculating a component of the unit vector pointing to the north pole direction, of the instant true equatorial plane normal in an orbital coordinate system according to the satelliteinstantaneous orbit elements; calculating a component of a unit vector in the local due east direction, of a sub-satellite point of the satellite in a satellite orbital coordinate system; calculatingan angle at which the satellite orbital coordinate system + X-axis vector rotate to the local due east vector of the sub-satellite point as a yaw guide angle; and ignoring a second-order small amountwhen the dip angle is small, and calculating a yaw guidance angle approximate value. The invention can eliminate the imaging rotation caused by the orbital deviation and the earth motion through theyaw attitude guiding control, and ensure that the reference of a remote sensing instrument is parallel to the local geographic orientation of the sub-satellite point, thereby improving the imaging precision and stability of the stationary remote sensing satellite.

Description

technical field [0001] The invention relates to an attitude control method for correcting imaging rotation of a stationary remote sensing satellite, in particular to a calculation method for a stationary satellite imaging yaw guidance angle. Background technique [0002] The imaging accuracy of geostationary remote sensing satellites is related to the processing accuracy of quantitative remote sensing products such as map surveying, weather diagnosis, and disaster monitoring applications, as well as wind vectors. However, due to the perturbation of celestial mechanics, there will be drift in the geosynchronous circular orbit 5, which will cause the instantaneous field of view 12 of the satellite remote sensing instrument to be reversed ( figure 1 ), and alternate with the motion of the satellite orbit. The quantitative products of geostationary remote sensing satellites need a fixed reference, that is, it is necessary to ensure that the images formed at different times are ...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem of field of view rotation in existing stationary remote sensing satellite imaging to the ground, the present invention proposes a method for calculating the yaw guidance angle of stationary satellite imaging; by performing yaw guidance during the satellite attitude control process, the satellite remote sensing instrument can be The reference datum is parallel to the local geographic position of the sub-satellite point

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