Calculation of image motion velocity for agile satellite dynamic imaging to changed continuously attitude point

HUANG Qun-dong; YANG Fang; ZHAO Jiang

doi:10.3788/OPE.20122012.2812

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Calculation of image motion velocity for agile satellite dynamic imaging to changed continuously attitude point

Article | 更新时间：2020-08-13

- Calculation of image motion velocity for agile satellite dynamic imaging to changed continuously attitude point
- Optics and Precision Engineering Vol. 20, Issue 12, Pages: 2812-2820(2012)
- 作者机构：
  
  航天东方红卫星有限公司北京,100094
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20122012.2812
  CLC： V443.5;V448.22
- Received：27 August 2012，
  
  Revised：28 September 2012，
  
  Published：10 December 2012
- 稿件说明：
移动端阅览
黄群东, 杨芳, 赵键. 姿态对地指向不断变化成像时的像移速度计算[J]. 光学精密工程, 2012,20(12): 2812-2820

HUANG Qun-dong, YANG Fang, ZHAO Jiang. Calculation of image motion velocity for agile satellite dynamic imaging to changed continuously attitude point[J]. Editorial Office of Optics and Precision Engineering, 2012,20(12): 2812-2820
黄群东, 杨芳, 赵键. 姿态对地指向不断变化成像时的像移速度计算[J]. 光学精密工程, 2012,20(12): 2812-2820 DOI： 10.3788/OPE.20122012.2812.

HUANG Qun-dong, YANG Fang, ZHAO Jiang. Calculation of image motion velocity for agile satellite dynamic imaging to changed continuously attitude point[J]. Editorial Office of Optics and Precision Engineering, 2012,20(12): 2812-2820 DOI： 10.3788/OPE.20122012.2812.

摘要

基于线阵时间延迟积分(TDI)CCD推扫成像原理

分析了敏捷卫星在三轴姿态机动过程中动态成像的像移问题。由于姿态对地指向不断改变会导致像面空间方位不断改变

从而造成像移速度的改变

本文通过坐标变换法推导出了动态成像方式下的像移速度数学解析表达式

仿真得到了不同姿态机动角速度情况下的TDICCD积分时间数量级。数值仿真分析表明:当前50 s级的航天相机在700 km的轨道高度可以实现以0.5()/s角速度上限进行动态推扫成像;当姿态机动角速度大于0.5()/s时

曝光时间越来越短

需要设计更高水平的相机。以上结论表明

对于不同角速度的动态成像任务

需要量化TDICCD积分时间数量级

实现在三轴姿态机动过程中开启光学有效载荷来完成推扫成像的动态成像。

Abstract

According to the principle of push-broom imaging of a linear array Time Delay Integration(TDI) CCD

the image motion in dynamic imaging of a agile satellite is analyzed in three-axis attitude maneuvering. As the changed continuously attitude points to the earth can change the spatial orientation and result in a changed image motion velocity

the image quality and image resolution will be deteriorated. To decrease the influence of attitude change on image quality

this article uses the coordinate transformation to acquire the mathematical expression of the image motion velocity in dynamic imaging

and obtains the variety of the image motion velocity in simulation analysis to quantify the magnitude of the integration time. Numerical simulation shows that the current level of space camera can achieve the max angular velocity limit dynamic push-broom imaging of 0.5()/s on an orbit height of 700 km. When the attitude maneuvering angular velocity is greater than 0.5()/s

it needs to design a high level camera because the exposure time is shorter and shorter. Based on the above conclusion

it suggests that the magnitude of integration time for TDI CCD TDI) should be quantified for dynamic imaging at different angle speeds

and only in this way can the push-broom dynamic imaging be implemented in three-axis attitude maneuvering.

关键词

Keywords

references

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Key Laboratory of Airborne Optical Imaging and Measurement,Changchun Institute of Optics, Fine Mechanics and Physics,Chinese Academy of Sciences

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