On-orbit correction method for optical axis pointing accuracy of remote sensor

Abstract

The embodiment of the invention discloses an on-orbit correction method for the optical axis pointing accuracy of a remote sensor. The method comprises the following steps: calculating and analyzing whether a remote sensor meets a necessary condition for observing a target fixed star according to a necessary condition formula; arranging an image plane at a preset focal plane distance by adjustinga focusing mechanism; after the image plane is located at the preset focal plane distance, determining the image point position of the target fixed star by adopting a moment center method with a threshold value; according to the image point position of the target fixed star, calculating a distance, an azimuth distance, a pitch distance and an offset angle between the actual imaging point positionof the target fixed star and the focus of the observer respectively based on an image offset distance formula, an azimuth distance formula, a pitch distance formula and an offset angle formula; withthe obtained deviation angle as a fixed error of the current optical axis pointing of the remote sensor, correcting the current optical axis pointing position of the remote sensor according to the fixed error. The method can correct the optical axis pointing in orbit, thereby effectively improving the optical axis pointing precision 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 optical axis pointing accuracy of remote sensors. Background technique [0002] Some trace gas elements in the atmosphere have vertical distribution characteristics and present a large gradient. For example, an altitude error of 500 meters in the tangential direction of the Earth's limb will increase the retrieval error of stratospheric ozone by 10%, and the retrieval error of tropospheric ozone by 20%. When the observation distance is relatively long (such as greater than 3000 kilometers), the error of the positioning angle of the scanning mirror 1' will cause the error of 1 km in the limb tangential height, so the limb observation of trace gases needs to precisely control the optical axis at the earth's edge. The height of the edge tangent to ensure the inversion accuracy of the vertical distribution of atmospheric components. [0003]...

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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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