Comprehensive Calibration and Data Application of High-orbit Ocean-color Satellite

doi:10.12382/bgxb.2024.0673

Abstract

Abstract:

High-orbit ocean observation satellites are effective tools for monitoring the short-term changes in marine environments and the sudden disasters near coastlines.This paper focuses on the comprehensive calibration and data application of high-orbit ocean color satellite technology.The current status and development trends of ocean color sensors in orbit are discussed,and the technical challenges,such as atmospheric correction,radiometric calibration,and sensor stability,are presented.To address these challenges,a unified calibration approach integrating ground-based,laboratory-based and on-orbit calibration methods is proposed.This approach ensures the high-precision calibration of sensors under different phases and conditions.The ground-based calibration,utilizing the standard radiometric sources and precise measurement equipment,ensures the initial accuracy of on-orbit sensors.Meanwhile,the on-orbit calibration involves the continuous monitoring and correction to maintain the long-term stability and data consistency of the sensors.The future developing directions of high-orbit ocean color satellite technology are summarized,and the importances of multisource remote sensing data integration,intelligent calibration algorithms and autonomous on-orbit correction techniques are emphasized.The research aims to provide more accurate and reliable data support for ocean observation,promoting the rwidespread application of high-orbit ocean color satellite technology in environmental monitoring,resource management,and scientific research.

Key words: satellite, high-orbit, ocean color, calibration, data application

CLC Number:

V474

CHEN Zhuoyi, SUN Rongyang, WANG Fuhai, LI Zhupeng, YUE Ronggang, WANG Chenglun. Comprehensive Calibration and Data Application of High-orbit Ocean-color Satellite[J]. Acta Armamentarii, 2024, 45(S2): 139-145.

Figures/Tables 8

Fig.1 GOCI satellite

Fig.2 Hour-by-hour observations of the Yangtze River Estuary by GOCI(April 5,2011)

Table 1 Design of comprehensive calibration scheme for space-earth integration

定标阶段		定标项目设计
地面研制阶段		实验室积分球定标	定标机构内定标
整星在轨阶段	单载荷	定标机构引入太阳光	定标机构内定标
	多载荷	各载荷设置3个相同谱段进行自交叉定标
	整星太阳定标	整星机动,多载荷同时进行太阳定标
	整星对月定标	整星机动,多载荷同时对满月月面成像
	与其他卫星主动交叉定标	整星机动,与其他卫星同时对地面相同区域进行同步成像

Fig.3 Schematic diagram of sun calibration on satellite

Fig.4 The orbit of moon and the positions of earth,moon and sun

Fig.5 Process of on-orbit cross-calibration

Fig.6 The concentration of suspended matters in Yangtze River Delta and offshore area by inversion of GF-4 observation data

Table 2 The improvement of combined application effect by comprehensive calibration methods

序号	验证内容	应用评价
1	SeaWiFS与HY-1卫星COCTS的系统交叉辐射校正	定标之后反演的各要素值与初始的反演值相比,有了很大的改进,与SeaWiFS反演产品结果接近
2	MODIS的HJ-1B红外通道星上定标系数交叉验证	HJ-1B红外通道基于星上定标系数反演得到的离表亮温进行定标验证,精度在1K以内
3	利用MODIS对FY-2E/VISSR红外窗区和水汽通道的交叉绝对辐射定标	利用2010年5月、7月和12月3个月的观测资料进行了交叉定标计算.交叉定标系数计算亮温与MODIS匹配点处实测结果非常接近,约90%的亮温偏差小于1K
4	利用MODIS对CBERS_02卫星CCD相机进行辐射交叉定标	交叉定标系数与8月25日的场地定标结果差异在2%~5%。与8月19日的场地定标及巴西提供的场地定标系数差别大些,最大的约10%
5	Landsat 5 TM、Landsat 7 ETM+及Landsat 8 OLI交叉定标研究	取不同区域的水体、植被、裸土地表反射率进行拟合,拟合度高,差异小
6	基于光谱与几何匹配的GOCI与MODIS交叉辐射定标	通过MODIS数据模拟的GOCI相应波段的表观箱亮度与GOCI实测结果比对, $R 2$ 大于0.8

Table 2 The improvement of combined application effect by comprehensive calibration methods

序号	验证内容	应用评价
1	SeaWiFS与HY-1卫星COCTS的系统交叉辐射校正	定标之后反演的各要素值与初始的反演值相比,有了很大的改进,与SeaWiFS反演产品结果接近
2	MODIS的HJ-1B红外通道星上定标系数交叉验证	HJ-1B红外通道基于星上定标系数反演得到的离表亮温进行定标验证,精度在1K以内
3	利用MODIS对FY-2E/VISSR红外窗区和水汽通道的交叉绝对辐射定标	利用2010年5月、7月和12月3个月的观测资料进行了交叉定标计算.交叉定标系数计算亮温与MODIS匹配点处实测结果非常接近,约90%的亮温偏差小于1K
4	利用MODIS对CBERS_02卫星CCD相机进行辐射交叉定标	交叉定标系数与8月25日的场地定标结果差异在2%~5%。与8月19日的场地定标及巴西提供的场地定标系数差别大些,最大的约10%
5	Landsat 5 TM、Landsat 7 ETM+及Landsat 8 OLI交叉定标研究	取不同区域的水体、植被、裸土地表反射率进行拟合,拟合度高,差异小
6	基于光谱与几何匹配的GOCI与MODIS交叉辐射定标	通过MODIS数据模拟的GOCI相应波段的表观箱亮度与GOCI实测结果比对, $R 2$ 大于0.8

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