黑体与恒星相结合的短波红外遥感器在轨辐射定标简析

晋利兵; 李晓曼; 练敏隆; 高慧婷; 周吉

黑体与恒星相结合的短波红外遥感器在轨辐射定标简析

晋利兵^{1, 2,},
李晓曼^{1, 2},
练敏隆^{1, 2},
高慧婷^{1, 2},
周吉^{1, 2}

1.
北京空间机电研究所, 北京 100094
2.
先进光学遥感技术北京市重点实验室, 北京 100094

基金项目:

国家自然科学基金（空间石墨烯膜基冷链强化传热及减振机理研究） 52106071

详细信息

作者简介:
晋利兵（1990-），男，山西晋中人，高级工程师，从事红外遥感总体设计工作。E-mail: jlb_99148@126.com

中图分类号: TP171.3
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- PDF下载量: 34
- 被引次数: 0
出版历程
- 收稿日期: 2022-03-19
- 修回日期: 2022-06-23
- 刊出日期: 2023-02-20

Analysis of the In-Orbit Radiation Calibration of SWIR Remote Sensing System Combined with Blackbody and Star

JIN Libing^{1, 2
,},
LI Xiaoman^{1, 2},
LIAN Minlong^{1, 2},
GAO Huiting^{1, 2},
ZHOU Ji^{1, 2}

1.
Beijing Institute of space Mechanics & Electricity, Beijing 100094, China
2.
Beijing Key Laboratory of Advanced Optical Remote Sensing Technology, Beijing 100094, China

摘要

摘要: 为满足气象水文、天文观测等领域对短波红外遥感器高精度探测需求，近年来对短波红外探测定量化应用的需求越来越高。本文针对高轨面阵短波红外遥感器在轨各种因素引起的非均匀性变化情况，基于面源黑体定标结合恒星定标的在轨绝对辐射定标设计方案，结合某遥感器任务研制过程的具体实际，分析了定标精度主要影响因素及优化措施，包括星上定标方案优化、星上黑体温度控制优化、恒星提取算法优化等。通过实验室测试对在轨辐射定标方法进行了验证，并对在轨绝对辐射定标不确定度进行预估，评估结果表明定标不确定度能够满足应用要求。
- 短波红外遥感器 /
- 在轨辐射定标 /
- 黑体 /
- 恒星定标
Abstract: Considering the demand for high-precision detection of SWIR remote sensing systems, the demand for the quantitative application of SWIR detection has increased in recent years. The change in inhomogeneity caused by shortwave infrared remote sensor was analyzed. The design scheme of non-point source blackbody calibration combined with star calibration in-orbit absolute radiation calibration; the actual development process of a remote sensing task; and the main influencing factors and optimization measures, including the optimization of the satellite calibration scheme, optimization of satellite blackbody temperature control, and star extraction algorithm, were analyzed. Based on the results of laboratory tests and estimation of the accuracy of the absolute radiation calibration, the evaluation results show that the calibration accuracy can meet the application requirements.
- short-wave infrared remote sensing system /
- in-orbit radiation calibration /
- blackbody /
- star calibration

HTML全文

图 1 高温黑体组件、低温黑体组件设计及实物

Figure 1. Design drawing and physical drawing of high temperature blackbody component and cryogenic blackbody component

下载: 全尺寸图片幻灯片

图 2 测试布局原理（上）及测试过程实物（下）

Figure 2. Testing schematic diagram(upper) & layout(down)

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图 3 相机点目标信噪比测试目标点周围9×9输出图像

Figure 3. Point target SNR ratio test around target point 9×9 output image

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表 1 某红外遥感器主要技术参数

Table 1. Parameters of the remote sensing system to be tested

Technical parameters	Value
Aperture of optical system/mm	250
Focal length of optical system/mm	425
Signal to noise ratio	≥5
Field of view/°	0.85×0.68
Number of detector pixels	640×512
Spectral range/μm	2-3

下载: 导出CSV

表 2 高、低温黑体计算结果

Table 2. Calculation results of high temperature blackbody and cryogenic blackbody

ITEMS	Temperature stability	Temperature uniformity
High-temperature blackbody	＜0.1℃/min	0.3℃
Low-temperature blackbody	＜0.1℃/min	0.3℃

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表 3 黑体定标结果、仿恒星定标结果及修正系数

Table 3. Blackbody calibration results, stellar simulation calibration results and correction coefficients

Test number	Stellar simulation calibration results		Blackbody calibration results		Correction coefficients
Test number	K_w	C_w	K_n	C_n	R_k	R_c
1	2838.6	34.1	2745.2	32.9	1.034	4.37E-04
2	2838.4	34.2	2745.3	32.9	1.033	4.73E-04
3	2838.7	34.0	2745.3	32.8	1.034	4.37E-04

下载: 导出CSV

表 4 红外遥感器在轨绝对辐射定标不确定度

Table 4. On orbit absolute radiometric calibration uncertainty of infrared camera

Influencing factors	Error source	Estimated value
δ_bb-Tacc	Blackbody temperature accuracy	2.10%
δ_bb-emi	Blackbody emissivity uncertainty	1.00%
δ_bb-Tuni	Outlet blackbody temperature uncertainty	0.74%
δ_bb-Tsta	Blackbody temperature stability uncertainty	1.17%
δ_rad	Instability of camera output signal	1.17%
δ_cam-noise	Camera time noise error	1.70%
δ_res-non	Camera responses nonlinerity error	1.00%
δ_strlight	Camera stray light effect	1.00%
Total σ/rms		3.68%

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