遥感25号是中国首颗高敏捷亚米级高分辨率光学遥感卫星。常规的偏航相对辐射定标利用卫星或相机偏航90°对地面均匀场进行成像，使得传感器所有探元获取相同的入瞳辐射亮度，实现卫星传感器的相对辐射定标。但拍摄单一地物均匀场并不能实现卫星传感器全动态范围的辐射定标，并降低了该方案的应用效率。本文针对中国遥感25号卫星，提出了不依赖于地面均匀场的无场化偏航辐射定标方法实现遥感25号的高精度高频次相对辐射定标；同时在偏航辐射定标数据处理中提出基于line segment detector（LSD）算法偏航定标数据规定化方法，确保偏航辐射定标图像每一行数据为传感器所有探元对同一地物的成像；采用传感器探元直方图规定化的方法实现遥感25号全动态范围相对辐射定标参数解算。利用遥感25号偏航辐射定标数据进行辐射定标试验并与传统在轨统计辐射定标进行对比，结果表明遥感25号经偏航辐射定标后所有探元平均条纹系数优于0.07%，图像上各种条纹条带噪声以及残余条带噪声得到较好去除，无场化偏航辐射定标方法优于传统在轨统计辐射定标方法。
YG-25 is the first agility optical remote sensing satellite of China to acquire the sub-meter imagery of the earth. The side slither calibration technique is an on-orbit maneuver that has been used to flat-field image data acquired over the uniform calibration field. However, imaging to the single uniform calibration field cannot afford to calibrate the full dynamic response range of the sensor and reduces the efficiency. The paper proposes a new relative radiometric calibration method that a 90-degree yaw maneuver is performed over any non-uniform features of the Earth for YG-25. Meanwhile, we use an enhanced side slither image horizontal correction method based on line segment detector(LSD)algorithm to solve the side slither image over-shifted problem.The shifted results are compared with other horizontal correction method. The histogram match algorithm is used to calculate the relative gains of all detectors. The correctness and validity of the proposed method are validated by using the YG-25 on-board side slither data. The results prove that the mean streaking metrics of relative correction images of YG-25 is better 0.07%, the noticeable striping artifact and residual noise are removed, the calibration accuracy of side slither technique based on non-uniform features is superior to life image statistics of sensor's life span.
[1] BARBOSA R C. Long March 4C Lofts Yaogan Weixing-25 Mission[EB/OL].[2016-02-29]. http://www.nasaspaceflight.com/2014/12/long-march-4c-yaogan-weixing-25/.
[2] DINGUIRARD M, SLATER P N. Calibration of Space-Multispectral Imaging Sensors:A Review[J]. Remote Sensing of Environment, 1999, 68(3):194-205.
[3] KRAUSE K S. WorldView-1 Pre and Post-Launch Radiometric Calibration and Early On-Orbit Characterization[C]//Proceedings of the SPIE 7081, Earth Observing Systems XⅢ. San Diego, CA:SPIE, 2008, 7081:708116.
[4] XIONG X, ERIVERS H, XIONG S, et al. Performance of Terra MODIS Solar Diffuser and Solar Diffuser Stability Monitor[C]//Proceedings of the SPIE 5882, Earth Observing Systems X. San Diego, CA:SPIE, 2005, 5882:58820S. DOI:10.1117/12.615334.
[5] XIONG Xiaoxiong, BARNES W. An overview of MODIS Radiometric Calibration and Characterization[J]. Advances in Atmospheric Sciences, 2006, 23(1):69-79.
[6] MARKHAM B L, BONCYK W C, BARKER J L, et al. Landsat-7 Enhanced Thematic Mapper Plus In-Flight Radiometric Calibration[C]//Proceedings of Remote Sensing for a Sustainable Future Geoscience and Remote Sensing Symposium. Lincoln, NE:IEEE, 1996:1273-1275.
[7] MORFITT R, BARSI J, LEVY, R, et al. Landsat-8 Operational Land Imager (OLI) Radiometric Performance On-Orbit[J]. Remote Sensing, 2015, 7(2):2208-2237.
[8] HORN B K P, WOODHAM R J. Destriping Landsat MSS Images by Histogram Modification[J]. Computer Graphics and Image Processing, 1979, 10(1):69-83.
[9] SHRESTHA A K. Relative Gain Characterization and Correction for Pushbroom Sensors Based on Lifetime Image Statistics and Wavelet Filtering[D]. Brookings, SD:South Dakota State University, 2010.
[10] HENDERSON B G, KRAUSE K S. Relative Radiometric Correction of QuickBird Imagery Using the Side-Slither Technique On Orbit[C]//Proceedings of the SPIE 5542, Earth Observing Systems IX. Denver, CO:SPIE, 2004, 5542:426-436.
[11] ANDERSON C, NAUGHTON D, BRUNN A, et al. Radiometric Correction of RapidEye Imagery Using the On-Orbit Side-Slither Method[C]//Proceedings of the SPIE 8180, Image and Signal Processing for Remote Sensing XVⅡ. Prague, Czech Republic:SPIE, 2011, 8180:818008.
[12] PESTA F, BHATTA S, HELDER D, et al. Radiometric Non-Uniformity Characterization and Correction of Landsat 8 OLI Using Earth Imagery-Based Techniques[J]. Remote Sensing, 2015, 7(1):430-446.
[13] GERACE A, SCHOTT J, GARTLEY M, et al. An Analysis of the Side Slither On-Orbit Calibration Technique Using the DIRSIG Model[J]. Remote Sensing, 2014, 6(11):10523-10545.
[14] KRAUSE K S. Relative Radiometric Characterization and Performance of the QuickBird High-Resolution Commercial Imaging Satellite[C]//Proceedings of the SPIE 5542, Earth Observing Systems IX. Denver, CO:SPIE, 2004, 5542:35-44.
[15] KNIGHT E J, KVARAN G. Landsat-8 Operational Land Imager Design, Characterization and Performance[J]. Remote Sensing, 2014, 6(11):10286-10305.
[16] eoPortal Directory. RapidEye[EB/OL].[2016-02-29]. https://directory.eoportal.org/web/eoportal/satellite-missions/r/rapideye.
[17] GADALLAH F L, CSILLAG F, SMITH E J M. Destriping Multisensor Imagery with Moment Matching[J]. International Journal of Remote Sensing, 2000, 21(12):2503-2511.
[18] VON GIOI R G, JAKUBOWICZ J, MOREL J M, et al. LSD:A Line Segment Detector[J]. Image Processing on Line, 2012, 2:35-55.
[19] VON GIOI R G, JAKUBOWICZ J, MOREL J M, et al. LSD:A Fast Line Segment Detector with a False Detection Control[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 2010, 32(4):722-732.
[20] HORN B K P, WOODHAM R J. Destriping LANDSAT MSS Images by Histogram Modification[J]. Computer Graphics and Image Processing, 1979, 10(1):69-83.
