A fast-rotation ultra-large-width swing-sweep imaging method for satellites

Abstract

The invention relates to a satellite fast-rotating ultra-large-width swing-scan imaging method, and the invention relates to an ultra-large-width swing-scan imaging method. The present invention aims to solve the problem that the conventional imaging method cannot meet the ultra-large width imaging of the ground area, and solve the problem of seamless splicing imaging between adjacent two-track imaging areas of a single satellite, and proposes a satellite fast-rotating ultra-large width swing imaging method. The method is to first calculate the width L5 perpendicular to the orbit; second, calculate the width L1 of the flight direction; third, determine the critical value of the distance L2 between the center of the optical axis of the detector and the track of the sub-satellite point on the ground surface is the flight direction 4. Calculate the spin velocity of the detector along the track direction; 5. Calculate the resolution Ac corresponding to the ultra-large width imaging of the detector under various orbital conditions; 6. Calculate the CCD line frequency Fp; 7. The calculation of the overlapping distance between the imaging areas of the two tracks is realized by steps such as L6. The invention is applied to the field of ultra-large-width swing-scan imaging.

Description

technical field [0001] The invention relates to a satellite ultra-large-width swing-scan imaging method, in particular to a satellite fast-rotating ultra-wide-width swing-sweep imaging method. Background technique [0002] Push-broom imaging of satellites is generally done by placing the detector perpendicular to the flight direction of the satellite, and collecting images one line at a time as the satellite flies forward. The size of the image range depends on the field of view of the CCD in the detector. Generally, a larger field of view can be achieved by splicing multiple CCDs or increasing the side swing capability of the camera at the same time. This is currently the most common imaging method for optical remote sensing satellites. The satellite's swing imaging uses a mirror to reflect light into the detector, and uses the back and forth swing of the mirror to collect a measurement value on a pixel. This imaging method has expensive and easily damaged moving parts an...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the method that can only be used for static push-broom imaging, large-angle dynamic push-broom imaging, or satellite static mirror swing imaging for satellites. In order to solve the problem of seamless stitching imaging between orbital imaging areas, a fast-rotating satellite ultra-large-width swing-sweep imaging method is proposed

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