Oversampling correction method and system based on moon phase graphical functional fitting

Abstract

The invention discloses an oversampling correction method and system based on moon phase graphical functional fitting, and the method comprises the following steps: extracting the pixel length of a pre-obtained moon image in a satellite scanning direction and a satellite movement direction based on contrast or edge recognition; calculating satellite parameters and moon parameters according to theephemeris, wherein the satellite parameters and the moon parameters are respectively the scanning speed of the remote sensor along the satellite motion direction and the relative position of the moon-satellite-sun; calculating a lunar phase angle and an orbit angle based on the extracted pixel length, and constructing a theoretical lunar phase graph function for obtaining a satellite view angle; through function fitting, determining a conversion coefficient of a pre-acquired moon image and a theoretical moon phase graph function, and acquiring an oversampling coefficient; and correcting moon shape stretching caused by time sequence recombination of the moon image observed by the satellite based on the oversampling coefficient to realize oversampling correction. According to the invention,the influence of oversampling on moon radiation correction can be accurately eliminated.

Description

technical field [0001] The invention belongs to the technical field of satellite remote sensing and lunar calibration, and in particular relates to an oversampling correction method and system based on functional fitting of lunar phase graphs. Background technique [0002] The remote sensor is composed of an optical part and an electrical part, and the two parts work together to complete the work of remote sensing detection. Among them, the calibration coefficient is used to quantify the conversion relationship between the electrical counting information transmitted back to the earth and the optical information actually detected by the optical detector. [0003] After the remote sensing satellite enters the orbit, it will be affected by aspects such as the space environment and the state of the instrument. There are certain differences. Therefore, on-orbit radiometric calibration is required to modify the calibration coefficients of remote sensors arriving in orbit in real...

AI Technical Summary

Problems solved by technology

The present invention adopts the method of processing the actual lunar image to obtain the actual over-sampling method, which reduces the influence of the accuracy of the simulation calculation on the over-sampling analysis; the present invention can realize the over-sampling analysis of the lunar image, and obtain a The oversampling coefficient of the rate information can solve the problems that the traditional algorithm is applicable to the small range of the moon phase and relies heavily on the image resolution; it can suppress the error caused by the previous image segmentation and extraction of the moon to a certain extent, and has strong practicability; it can be more accurate Effects of Earth Culling and Oversampling on Lunar Radiation Correction

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