On-orbit mtf measurement method of aerospace optical remote sensor
An optical remote sensor and measurement method technology, applied in the field of optical remote sensing applications, can solve the problems of low measurement accuracy and complex target laying, and achieve the effects of broad application prospects, simplified laying methods, and reasonable methods.
Active Publication Date: 2018-10-30
SHANGHAI SATELLITE ENG INST
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[0004] Aiming at the defects in the prior art, the purpose of the present invention is to provide an on-orbit MTF measurement method for aerospace optical remote sensors that solves the problems of complex target laying and low measurement accuracy in the current on-orbit MTF test method for aerospace optical remote sensors based on periodic targets
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[0047] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0048] Marked as:
[0049] 1. Plan view of the first set of targets;
[0050] 2. The equivalent output waveform of the first group of targets after passing the sensor;
[0051] 3. Plan view of the second set of targets;
[0052] 4. The equivalent output waveform of the second group of targets after passing through the sensor;
[0053] 5. The equivalent sampling position of the sensor to the target laid on the ground;
[0054] 6. The first equivalent sampling position of the output waveform of the...
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An in-orbit MTF measuring method for a spaceflight optical remote sensor is provided. The method includes (1) a step of arranging two periodic target groups at the testing direction with the phase difference being m, (2) a step of establishing a theoretical relation between a signal output after a square signal passes through an optical imaging system and the in-orbit MTF according to a linear optical imaging system, (3) a step of substituting according to sampling results of the two periodic target groups by a sensor, and (4) a step of calculating an output modulation degree according to a fitting result of the output signal in the step (1) and the step (3), calculating a modulation transfer function of the sensor through combining an input modulation degree of a ground target, and calculating the in-orbit MTF of the spaceflight optical remote sensor at the testing direction. Compared with the prior art, the method is reasonable and easy to implement, can significantly improve in-orbit MTF measuring precision for the spaceflight optical remote sensor and has a wide application prospect.
Description
Technical field [0001] The invention relates to the application field of optical remote sensing, in particular a high-precision measurement method of an aerospace optical remote sensor on-orbit MTF. Background technique [0002] The modulation transfer function (MTF) reflects the overall imaging performance of the optical remote sensing load by describing the modulation loss and signal diffusion at each spatial frequency after the target is imaged by the optical remote sensing load. Commonly used edge method, pulse method and point light source method and other on-orbit test methods solve the MTF of the sensor by obtaining the edge spread function-line spread function / point spread function-Fourier transform of the remote sensing image of a specific reference target. However, this type of measurement method is easily affected by factors such as system noise and method inherent deviation, and the data consistency is poor. The periodic target-based measurement method calculates the...
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IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 吴泽鹏范凯成飞陈锋游月辉陈占胜
Owner SHANGHAI SATELLITE ENG INST