Satellite-borne TDI CMOS camera imaging simulation method and apparatus

Abstract

The present invention provides a satellite-borne TDI CMOS camera imaging simulation method and an apparatus. The method comprises the following steps that: the data source range of a CMOS instantaneous focal plane imaging area is obtained according to the geometric parameters of a CMOS camera and satellite attitude and orbit data; the surface reflectance of the imaging area and atmospheric transmission simulation parameters are obtained; an integration time interval is obtained according to image ground resolution, satellite orbit data and attitude data of each integration time point are obtained; a CMOS pixel is uniformly divided into a plurality of sub-pixels; the entrance pupil radiance images of the CMOS camera at each integration time point are obtained according to the above parameters; the entrance pupil radiance images of the CMOS camera are filtered, so that CMOS focal plane radiance images at each integration time point are obtained; the CMOS focal plane radiance images are converted into charge number images, and the charge number images at each integration time point are obtained; and integration delay accumulation is performed on the charge number images, and analog-to-digital conversion is performed, and therefore, a gray value image is obtained. With the satellite-borne TDI CMOS camera imaging simulation method and the apparatus of the invention adopted, limitations caused by a condition that an existing surveying and mapping remote sensing satellite adopts a TDI CCD camera can be eliminated; and the problem of few researches on the imaging simulation of the TDI CMOS camera can be solved.

Description

technical field [0001] The invention relates to the technical field of satellite imaging simulation, in particular to an imaging simulation method and equipment for a satellite-borne TDI CMOS camera. Background technique [0002] With the development of aerospace remote sensing technology, people have higher and higher requirements for the update frequency of remote sensing data. The temporal resolution of remote sensing images must reach one day or even several hours. However, large-platform satellites like Ziyuan-3 are not only costly, but also have limited maneuverability, making it difficult to meet the increasing image acquisition speed. Due to the low cost of small satellites equipped with CMOS imaging sensors, they can form satellite constellations and obtain images with hour-level time resolution, which is becoming a new trend in the field of space remote sensing. [0003] Compared with traditional CCD imaging sensors, CMOS sensors have the advantages of low power ...

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Problems solved by technology

[0008] In view of this, the embodiment of the present invention provides a method and device for imaging simulation of a spaceborne TDI CMOS camera, to solve the limitations of existing surveying and mapping remote sensing satellites using TDI CCD cameras, and there are few researches on imaging simulation of TDI CMOS cameras. question

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