Abstract
The whiskbroom scanning imaging mode effectively expands the imaging field of the space optical camera, and realizes high-resolution and wide-width spatial imaging. However, the dynamic disturbance in the short-term and large-scale imaging process will cause uneven degradation of the image. Therefore, a geometric model of the camera instantaneous imaging at a moment is constructed. Then, the movement trend of the camera and the deflection of the light are deduced separately for establishing the analysis model of the kinematic disturbance and the morphological disturbance. Finally, the dynamic disturbance result of the imaging process is obtained by fusing both kinematic disturbance and morphological disturbance, and the simulated image of the dynamic disturbance is evaluated by combining the geometric parameters and the image quality evaluation index. The results show that the dynamic disturbance of the imaging will be enhanced with the increase of the whiskbroom angle and angular velocity, resulting in the decrease of the peak signal-to-noise ratio and the structural similarity of the image. When the angular velocity on the 500km orbit increases from 1°/ $s$ to 10°/ $s$ , the peak signal-to-noise ratio and structural similarity of the simulated image, affected by the combining influence of kinematic disturbance and morphological disturbance, decrease by 2.1454 dB and 0.1131 respectively at 0°, but decrease by 1.5680 dB and 0.0405 at 45°. The analysis results of this paper can provide an effective reference for further research on the degradation process of whiskbroom ultra-wide image and improve the quality of the image.
Highlights
Space optical remote sensing technology appears actively in key areas such as information detection and situational awareness, and gradually becomes an efficient and indispensable means of obtaining information in modern society
Single-camera imaging can avoid the image degradation caused by the stitching process of multiple cameras, and satisfy the high-resolution and large-width imaging requirements of the optical remote sensing technology
The kinematic characteristics of the whiskbroom scanning imaging process will introduce uneven dynamic disturbances and extend the imaging object distance of the camera, causing the optical path gradient of the imaging light in the transmission process, which will lead to the changing of resolution and the shifting of imaging area, and reduce the imaging quality
Summary
Space optical remote sensing technology appears actively in key areas such as information detection and situational awareness, and gradually becomes an efficient and indispensable means of obtaining information in modern society. Because of the lack of imaging and control technology, the static push-broom mainly used in the early age usually led to insufficient regional coverage and resolution capabilities of cameras, which reduced the imaging efficiency and orbital resource utilization [1], and the multi-camera image stitching technology used to enrich the imaging coverage further reduced the image resolution, aggravating the image quality degradation [2,3] For this reason, dynamic analysis is proposed to apply to the whiskbroom process, which can effectively expand the imaging width and increase the area coverage through the whiskbroom scanning movement [4].
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