敏捷卫星主动推扫成像积分时间设置研究
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摘要
针对敏捷卫星的新型工作方式——主动推扫成像过程中的积分时间设置开展了研究。通过建立敏捷卫星主动推扫成像典型场景和积分时间模型,仿真了敏捷卫星主动推扫成像过程中相机TDICCD的积分时间变化情况,并给出了设置建议。文章对两种典型工况进行了仿真计算,均为卫星对垂轨条带进行扫描,条带长度分别为170km和1520km,仿真结果表明:积分时间在主动推扫成像过程中实时变化,同时在大角度机动下,边缘和中心视场的积分时间有较大差异。积分时间的实时变化需要进行积分时间的实时设置,并仿真给出了设置频率的需求;而积分时间边缘和中心视场的不一致,需要进行积分时间的分片设置。分析表明采用这些措施后,主动推扫过程中由于积分时间设置引起的图像MTF下降能得到有效控制。文章的仿真结果可以为我国敏捷卫星总体的设计和相机的设计提供参考。
This article studies a new working mode(active imaging mode)of agile satellite.An active imaging process model and an integral time of the TDICCD calculation model are built,and the integral time of the TDICCD during active imaging process is simulated.The setting demand of the integral time is given according to the calculation results.Two typical cases are simulated and calculated.These both cases are with the imaging strip perpendicular to the sub-track,except the different length of the imaging strip.One is 170 km,and the other is 1520 km.The simulation and calculation results indicate that the integral time is changing all along the active imaging process,and in the large-angle imaging situation,the integral time at the edge and the center of the TDICCD have great difference.The real-time changing of the integral time needs the real-time setting of the integral time during the active imaging process and the difference of the integral time at different position of the TDICCD needs setting the integral time of different CCD separately.Analysis shows that with these setting being made,the descent of MTF of the imaging picture due to active imaging can be efficiently controlled.The calculation results of this article can give advice to the design of agile satellite and its camera.
This article studies a new working mode(active imaging mode)of agile satellite.An active imaging process model and an integral time of the TDICCD calculation model are built,and the integral time of the TDICCD during active imaging process is simulated.The setting demand of the integral time is given according to the calculation results.Two typical cases are simulated and calculated.These both cases are with the imaging strip perpendicular to the sub-track,except the different length of the imaging strip.One is 170 km,and the other is 1520 km.The simulation and calculation results indicate that the integral time is changing all along the active imaging process,and in the large-angle imaging situation,the integral time at the edge and the center of the TDICCD have great difference.The real-time changing of the integral time needs the real-time setting of the integral time during the active imaging process and the difference of the integral time at different position of the TDICCD needs setting the integral time of different CCD separately.Analysis shows that with these setting being made,the descent of MTF of the imaging picture due to active imaging can be efficiently controlled.The calculation results of this article can give advice to the design of agile satellite and its camera.
引文
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[9]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):2812-2820Huang Qundong,Yang Fang,Zhao Jiang.Calculation of image motion velocity for agile satellite dynamic imaging to changed continuously attitude point[J].Optics and Precision Engineering,2012,20(12):2812-2820(in Chinese)
[10]樊超,李英才,易红伟.速高比对TDICCD相机的影响分析[J].兵工学报,2007,28(7):817-821Fan Chao,Li Yingcai,Yi Hongwei.Influence of velocityheight ratio of satellite on the TDICCD camera[J].Acta Armamentarii,2007,28(7):817-821(in Chinese)
[2]Jawak S D,Luis A J.Application of Worldview-2satellite data for extraction of polar spatial information and DEM of Larsemann Hills,East Antarctica[J].Remote Sensing and Environment Letters,2012,2(1):19
[3]Jawak S D,Luis A J,Panditrao S N,et al.Advancement in landcover classification using very highresolution remotely sensed 8-band WorldView-2satellite data[J].International Journal of Earth Science and Engineering,2013,6(2):1742-1749
[4]Astrium Company.Pleiades imagery user guide[Z].Cedex:Astrium Company,2012
[5]M Alain Gleyzes,Lionel Perret,Philippe Kubik.Pleiades system architecture and main performances[J].International Archives of the Photogrammetry,Remote Sensing and Spatial Information Sciences,2012,XXXIXB1:537-542
[6]余婧,喜进军,于龙江,等.敏捷卫星同轨多条带拼幅成像模式研究[J].航天器工程,2015,24(2):27-34Yu Jing,Xi Jinjun,Yu Longjiang,er al.Study of one-orbit multi—stripes splicing imaging for agile satellite[J].Spacecraft Engineering,2015,24(2):27-34(in Chinese)
[7]张新伟,戴君,刘付强.敏捷遥感卫星工作模式研究[J].航天器工程,2011,20(4):32-38Zhang Xinwei,Dai Jun,Liu Fuqiang.Research on working mode of remote sensing satellite with agile attitude control[J].Spacecraft Engineering,2011,20(4):32-38(in Chinese)
[8]黄群东,杨芳,赵键.敏捷成像时TDICCD积分时间调整及基于MTF的像移分析[C]//2011年小卫星技术交流会.北京:航天东方红卫星有限公司,2011Huang Qundong,Yang Fang,Zhao Jiang.The integral time adjusting of the TDICCD and the image motion analysis based on MTF for the agile imaging[C]//2011Small Satellite Technique Symposium.Beijing:DFH Co.Ltd.,2011(in Chinese)
[9]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):2812-2820Huang Qundong,Yang Fang,Zhao Jiang.Calculation of image motion velocity for agile satellite dynamic imaging to changed continuously attitude point[J].Optics and Precision Engineering,2012,20(12):2812-2820(in Chinese)
[10]樊超,李英才,易红伟.速高比对TDICCD相机的影响分析[J].兵工学报,2007,28(7):817-821Fan Chao,Li Yingcai,Yi Hongwei.Influence of velocityheight ratio of satellite on the TDICCD camera[J].Acta Armamentarii,2007,28(7):817-821(in Chinese)