遥感全链路场景灰度信息传递规律研究

发布时间：2018-04-08 11:22

  本文选题：信道矩阵　切入点：遥感全链路　出处：《哈尔滨工业大学》2014年硕士论文

【摘要】：空间光学遥感系统的成像质量由大气传输、光学成像系统、卫星平台的姿态稳定度、CCD探测器、数据传输系统以及地面处理等多个环节共同保证。传统遥感器的研究过程没有从灰度信息传递的角度来进行设计，不能充分发挥系统的信息传递能力。论文采用信息论的方法对遥感成像过程中灰度信息的传递进行分析，研究链路中各子系统之间的参数匹配关系，，使遥感链路的信息传递能力得到充分利用。 首先，本文将遥感链路分为大气、光学系统、卫星平台的姿态稳定度、CCD探测器以及电子电路等部分，建立对应的信息传递模型，分别对各子系统的灰度信息传递能力进行研究。为了使分析的结果更具客观性，本文选取山区、河流、海港、城区和机场等不同场景模型的二维光分布作为输入信号，并对输入场景模型进行离散化处理，将其中所包含的灰度信息用统计平均的方法进行表示。其次，依据信息传递模型仿真不同的场景经各子系统独立传输时的成像过程以及经链路信道连续传输后的成像过程，应用信息论的原理确定评价指标，计算分析场景灰度信息经链路信道传输后的信息指标。最后，计算分析成像前后灰度信息指标的变化情况，研究链路各子系统对灰度信息的传递能力，得出经遥感全链路传递后灰度信息的变化情况，以此进行子系统参数匹配研究。通过研究分析发现，大气信道和光学系统对灰度信息的传递影响最大，引起的信息传递效率和信道容量的损失超过10%。其次是CCD探测器，而姿态稳定度与电子电路部分对灰度信息的传递影响很小，可忽略不计。由于大气属于不可控因素，本文主要通过改变光学系统与CCD探测器的结构参数来研究其匹配关系。计算分析的结果表明，当光学系统F#≤14，CCD像元尺寸d≤8μm时，遥感全链路同时具有较高的信息传递效率和信道容量，具有较好的灰度信息传递能力。
[Abstract]:The imaging quality of space optical remote sensing system is guaranteed by atmospheric transmission, optical imaging system, attitude stability of satellite platform and CCD detector, data transmission system and ground processing.The research process of traditional remote sensor is not designed from the angle of grayscale information transmission, so it can not give full play to the information transmission ability of the system.In this paper, the information theory is used to analyze the transmission of gray information in remote sensing imaging, and the matching relationship between the subsystems in the link is studied to make the best use of the information transfer ability of the remote sensing link.Firstly, the remote sensing link is divided into atmosphere, optical system, attitude stability of satellite platform, CCD detector and electronic circuit. The corresponding information transfer model is established, and the gray level information transfer ability of each subsystem is studied respectively.In order to make the results of the analysis more objective, this paper selects the two-dimensional light distribution of different scene models such as mountains, rivers, seaports, urban areas and airports as input signals, and discretizes the input scene models.The gray level information contained therein is represented by statistical average method.Secondly, according to the information transfer model, the imaging process of different scenes transmitted independently by each subsystem and the imaging process after continuous transmission through the link channel are simulated, and the evaluation index is determined by the principle of information theory.The information index of scene grayscale information transmitted through link channel is calculated and analyzed.Finally, the change of gray information index before and after imaging is calculated and analyzed, and the transmission ability of link subsystems to gray information is studied, and the change of gray information after transmission through remote sensing link is obtained, and the matching of subsystem parameters is studied.It is found that the atmospheric channel and optical system have the greatest influence on the transmission of gray information, resulting in a loss of more than 10% of the transmission efficiency and channel capacity.The second is the CCD detector, but the attitude stability and the electronic circuit have little influence on the transmission of gray information, which is negligible.Because the atmosphere is an uncontrollable factor, the matching relationship between the optical system and the CCD detector is studied by changing the structural parameters of the optical system.The results of calculation and analysis show that when the pixel size of optical system F# 鈮

本文编号：1721384