Spectral and radiometric calibrations for mapping satellite-1 camera

WAN Zhi; LI Bao-yong; LIU Ze-xun; LIU Hong-xing; REN Jian-wei

doi:10.3788/OPE.20152307.1867

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Spectral and radiometric calibrations for mapping satellite-1 camera

更新时间：2020-08-12

- Spectral and radiometric calibrations for mapping satellite-1 camera
- Optics and Precision Engineering Vol. 23, Issue 7, Pages: 1867-1873(2015)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所,吉林长春,中国,130033
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152307.1867
  CLC： V447.3;P414.4
- Received：20 March 2015，
  
  Revised：08 April 2015，
  
  Published：25 July 2015
- 稿件说明：
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万志, 李葆勇, 刘则洵等. 测绘一号卫星相机的光谱和辐射定标[J]. 光学精密工程, 2015,23(7): 1867-1873

WAN Zhi, LI Bao-yong, LIU Ze-xun etc. Spectral and radiometric calibrations for mapping satellite-1 camera[J]. Editorial Office of Optics and Precision Engineering, 2015,23(7): 1867-1873
万志, 李葆勇, 刘则洵等. 测绘一号卫星相机的光谱和辐射定标[J]. 光学精密工程, 2015,23(7): 1867-1873 DOI： 10.3788/OPE.20152307.1867.

WAN Zhi, LI Bao-yong, LIU Ze-xun etc. Spectral and radiometric calibrations for mapping satellite-1 camera[J]. Editorial Office of Optics and Precision Engineering, 2015,23(7): 1867-1873 DOI： 10.3788/OPE.20152307.1867.

摘要

对测绘一号卫星相机的各个光谱通道进行了光谱定标和辐射定标以验证其光谱辐射性能是否达到设计指标要求。进行光谱定标时

利用单色仪分光谱扫描波长提供准直单色辐射照明

同时同步采集定标图像数据;然后将图像灰度值与已经过校准的参考标准探测器的输出进行比对和数据处理

得到相机各个谱段的相对光谱响应函数曲线

从而进一步获得各项光谱特性参量。辐射定标时

采用近距离面源法充满相机的孔径和视场进行端对端的绝对和相对辐射定标。星上内定标则采用经老炼和筛选过的发光二极管(LED)作为星上定标光源

对焦平面阵列探测器及其成像电路的状态和辐射响应性能变化进行在轨监测

在必要的情况下予以校正。定标结果显示:测绘一号卫星相机的各项光谱和辐射性能均达到了设计指标要求

经过相对辐射校正后响应非均匀性由1.93%下降到0.22%

相机全色谱段信噪比超过90倍

多光谱各通道信噪比优于180倍;发射后在轨星上内定标数据与发射前实验室测试结果的比对显示相机的辐射响应性能未发生明显变化

暂时无须校正。

Abstract

The spectral calibration and radiometric calibration were performed for every waveband of the Mapping Satellite-1 camera to validate its spectral and radiometric performance. In spectral calibration

a collimated monochromatic light source was provided by wavelength scan using a monochrometer and a collimator. Meanwhile

the camera acquired calibration images

and then compared image's digital number and the output of calibrated standard reference detector to obtain relative spectral responsive curve by data analysis and processing. Furthermore

spectral characteristics were acquired. In radiometric calibration

the nearest emitting source method was used to perform the end to end relative and absolute radiometric calibrations with irradiating the whole aperture and the field of view. In the on-orbit inner calibration

the aged and picked up LEDs were employed as on-orbit inner calibration light sources to monitor the changes and status of focal plane detector array and its imaging electric circuit at post launch

and they were corrected in necessary conditions. Spectral calibration and radiometric calibration results indicate that all the spectral performance and radiometric performance of the Mapping Satellite-1 camera meet design requirements

non-uniformity of the camera is decreased from 1.93% to 0.22% after relative radiometric calibration. The typical Signal to Noise ratios(SNRs) of panchromatic and multispectral cameras are beyond 90 times and 180 times respectively. The compared results from the on-board inter calibration after launching and the tested data from a laboratory before launching show that radiometric responsive performance of the camera has not changed during this period

and not need to be corrected.

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references

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