本文選題：信道矩陣　切入點(diǎn)：遙感全鏈路　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：空間光學(xué)遙感系統(tǒng)的成像質(zhì)量由大氣傳輸、光學(xué)成像系統(tǒng)、衛(wèi)星平臺的姿態(tài)穩(wěn)定度、CCD探測器、數(shù)據(jù)傳輸系統(tǒng)以及地面處理等多個環(huán)節(jié)共同保證。傳統(tǒng)遙感器的研究過程沒有從灰度信息傳遞的角度來進(jìn)行設(shè)計，不能充分發(fā)揮系統(tǒng)的信息傳遞能力。論文采用信息論的方法對遙感成像過程中灰度信息的傳遞進(jìn)行分析，研究鏈路中各子系統(tǒng)之間的參數(shù)匹配關(guān)系，，使遙感鏈路的信息傳遞能力得到充分利用。 首先，本文將遙感鏈路分為大氣、光學(xué)系統(tǒng)、衛(wèi)星平臺的姿態(tài)穩(wěn)定度、CCD探測器以及電子電路等部分，建立對應(yīng)的信息傳遞模型，分別對各子系統(tǒng)的灰度信息傳遞能力進(jìn)行研究。為了使分析的結(jié)果更具客觀性，本文選取山區(qū)、河流、海港、城區(qū)和機(jī)場等不同場景模型的二維光分布作為輸入信號，并對輸入場景模型進(jìn)行離散化處理，將其中所包含的灰度信息用統(tǒng)計平均的方法進(jìn)行表示。其次，依據(jù)信息傳遞模型仿真不同的場景經(jīng)各子系統(tǒng)獨(dú)立傳輸時的成像過程以及經(jīng)鏈路信道連續(xù)傳輸后的成像過程，應(yīng)用信息論的原理確定評價指標(biāo)，計算分析場景灰度信息經(jīng)鏈路信道傳輸后的信息指標(biāo)。最后，計算分析成像前后灰度信息指標(biāo)的變化情況，研究鏈路各子系統(tǒng)對灰度信息的傳遞能力，得出經(jīng)遙感全鏈路傳遞后灰度信息的變化情況，以此進(jìn)行子系統(tǒng)參數(shù)匹配研究。通過研究分析發(fā)現(xiàn)，大氣信道和光學(xué)系統(tǒng)對灰度信息的傳遞影響最大，引起的信息傳遞效率和信道容量的損失超過10%。其次是CCD探測器，而姿態(tài)穩(wěn)定度與電子電路部分對灰度信息的傳遞影響很小，可忽略不計。由于大氣屬于不可控因素，本文主要通過改變光學(xué)系統(tǒng)與CCD探測器的結(jié)構(gòu)參數(shù)來研究其匹配關(guān)系。計算分析的結(jié)果表明，當(dāng)光學(xué)系統(tǒng)F#≤14，CCD像元尺寸d≤8μm時，遙感全鏈路同時具有較高的信息傳遞效率和信道容量，具有較好的灰度信息傳遞能力。
[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

本文編號：1721384