An On-orbit Correction Method for Optical Axis Pointing Accuracy of Remote Sensors

Abstract

The embodiment of the invention discloses a method for on-orbit correction of the pointing accuracy of the optical axis of a remote sensor. The method includes calculating according to the necessary condition formula, analyzing whether the remote sensor meets the necessary conditions for observing the target star; adjusting the focusing mechanism so that the image plane is at the preset focal plane distance; after the image plane is at the preset focal plane distance, using the The centroid method of the threshold value determines the image point position of the target star; according to the image point position of the target star, according to the offset distance formula, azimuth distance formula, pitch distance formula and offset angle formula, the actual imaging of the target star is obtained respectively. The distance, azimuth distance, pitch distance and offset angle between the point position and the focus of the observer; take the obtained offset angle as the fixed error of the current optical axis of the remote sensor, and correct the current optical axis of the remote sensor according to the fixed error. The axis points to the position. The method can correct the optical axis pointing on the track, thereby effectively improving the optical axis pointing accuracy of the remote sensor.

Description

technical field [0001] The invention relates to the technical field of remote sensors, in particular to an on-orbit correction method for the pointing accuracy of an optical axis of a remote sensor. Background technique [0002] Some trace gas elements in the atmosphere have vertical distribution characteristics and show large gradients. For example, an altitude error of 500 m tangential to the Earth's limb will result in a 10% increase in the stratospheric ozone retrieval error and a 20% increase in the tropospheric ozone retrieval error. When the observation distance is long (such as more than 3000 kilometers), the error of 1' in the positioning angle of the scanning mirror will cause an error of 1 km in the tangential height of the limb. Therefore, the limb observation of trace gas needs to precisely control the optical axis in the vicinity of the earth. The height of the edge tangential upward to ensure the inversion accuracy of the vertical distribution of atmospheric ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem in the prior art that there is an error in the on-orbit limb positioning accuracy of the scanning mirror for trace gas observation, the embodiment of the present invention provides a method for on-orbit correction of the optical axis pointing accuracy of the remote sensor, thereby effectively improving the optical accuracy of the remote sensor. Axis pointing accuracy

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