A method for obtaining the accuracy of the on-orbit mtf of optical remote sensing payloads measured by the edge method

Abstract

The invention provides a method for obtaining the measurement of the optical remote-sensing load in-orbit MTF precision by employing a knife-edge method. According to the method, an MTF reference value is set based on a practically-tested MTF value, according to characteristics of the knife-edge method MTF test, key parameters are extracted based on knife-edge images obtained by the load during the practical test to generate a reference image, the reference image is calculated by employing the knife-edge method to obtain an MTF calculating value, the calculating value and the MTF reference value are compared, an absolute error and a relative error are obtained, and the MTF measuring precision (or the uncertainty) is obtained. The problem that according to the conventional precision analysis method, the optimal remote-sensing load in-orbit MTF measuring precision in practical measurement by employing the knife-edge method cannot be obtained or estimated is solved.

Description

technical field [0001] The invention relates to the technical field of earth observation remote sensing, in particular to a method for obtaining the measurement accuracy of measuring the on-orbit MTF of an optical remote sensing load based on the edge method. Background technique [0002] Modulation Transfer Function (MTF) is an important indicator for evaluating the imaging performance of optical remote sensing payloads. It represents the percentage of modulation loss of each spatial frequency signal after passing through the optical imaging system, and reflects the signal loss of the imaging system during the imaging process of the target. The degree of diffusion and attenuation is one of the indicators commonly used in the world to evaluate the imaging performance and spatial resolution of optical remote sensing payloads. [0003] According to the different targets selected, the current methods for measuring the on-orbit MTF of optical remote sensing payloads mainly inclu...

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Problems solved by technology

[0013] The present invention proposes a method for measuring the on-orbit MTF measurement accuracy of optical remote sensing loads by the edge method based on the actual imaging conditions of the load, so as to solve the problem that the existing accuracy analysis method cannot obtain or estimate the actual measurement of the on-orbit MTF measurement of the optical remote sensing load by the edge method problem of precision

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