本文關(guān)鍵詞：遙感衛(wèi)星指向誤差定義度量與分配預(yù)算方法　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 指向誤差 指向度量指標(biāo) 狀態(tài)空間模型 指向誤差綜合 指向誤差分配預(yù)算

【摘要】：隨著遙感技術(shù)的飛速發(fā)展與需求種類的不斷豐富,遙感任務(wù)對(duì)于分辨率的要求越來(lái)越高。衛(wèi)星作為有效載荷的平臺(tái),在發(fā)射與在軌工作的過(guò)程中,會(huì)受到各種因素的影響,從而產(chǎn)生指向誤差。指向誤差的存在,是制約高分辨率成像的關(guān)鍵因素,因此本文以高分辨率遙感成像為背景,對(duì)指向誤差的定義、度量指標(biāo)以及指向誤差綜合與分配預(yù)算構(gòu)建方法展開了研究與分析,本論文的主要研究?jī)?nèi)容如下:指向誤差由指向精度誤差與指向穩(wěn)定度誤差組成,指向穩(wěn)定度誤差由條帶誤差與顫振殘差組成。低頻指向誤差主要造成指向精度誤差,高頻指向誤差主要造成指向穩(wěn)定度誤差。提出了指向誤差的時(shí)域與頻域度量形式,同時(shí)給出了指向誤差的不同的統(tǒng)計(jì)解釋方法與度量指標(biāo)。在此基礎(chǔ)之上,建立了指向誤差的狀態(tài)空間模型。在計(jì)算過(guò)程中,狀態(tài)空間模型可以避免復(fù)雜的數(shù)值積分,利用解析的表達(dá)形式對(duì)指向誤差進(jìn)行計(jì)算。以點(diǎn)擴(kuò)散函數(shù)為基準(zhǔn),分析了指向誤差對(duì)成像質(zhì)量的影響,指出了指向誤差的存在,可以使點(diǎn)擴(kuò)散函數(shù)變寬,從而造成成像質(zhì)量的下降。對(duì)能夠造成指向誤差的誤差源進(jìn)行了描述與建模。在衛(wèi)星發(fā)射至在軌開展工作的過(guò)程中,對(duì)衛(wèi)星平臺(tái)及有效載荷能夠產(chǎn)生干擾的誤差源大致可以分為四類:安裝誤差、敏感器誤差、執(zhí)行機(jī)構(gòu)誤差與空間環(huán)境干擾。利用概率密度函數(shù)對(duì)指向誤差源進(jìn)行了數(shù)學(xué)描述,得出了指向誤差源的統(tǒng)計(jì)性質(zhì);分析了指向誤差的傳遞過(guò)程,建立遙感衛(wèi)星系統(tǒng)中所需的傳遞模型;提出了不同類型的指向誤差的合成方法,分析了存在相關(guān)性的指向誤差源與不存在相關(guān)性的指向誤差源的綜合方法。對(duì)指向誤差的分配預(yù)算構(gòu)建進(jìn)行了研究與分析。分析了指向誤差分配預(yù)算的構(gòu)建步驟與流程;依據(jù)指向誤差的變化性質(zhì),對(duì)指向誤差進(jìn)行了劃分,將指向誤差分為偏差、均勻分布誤差、高斯誤差、正弦誤差以及漂移誤差,對(duì)不同誤差的度量指標(biāo)、統(tǒng)計(jì)解釋方法進(jìn)行了分析;通過(guò)具體實(shí)例分析,說(shuō)明了指向誤差分配預(yù)算的構(gòu)建過(guò)程,從而得出指向誤差分配預(yù)算在遙感衛(wèi)星初步設(shè)計(jì)過(guò)程中具有較為重要的意義。
[Abstract]:With the rapid development of remote sensing technology and the increasing variety of requirements, the remote sensing mission requires more and more high resolution. As a payload platform, satellite is in the process of launching and working in orbit. The existence of pointing error is the key factor restricting high resolution imaging. Therefore, the definition of pointing error is based on the background of high resolution remote sensing imaging. The main contents of this paper are as follows: the pointing error is composed of the pointing precision error and the directional stability error. The directional stability error is composed of strip error and flutter residual error, and the low frequency pointing error mainly causes the pointing accuracy error. The high frequency pointing error mainly causes the direction stability error. The time domain and frequency domain measurement forms of the direction error are proposed. At the same time, different statistical interpretation methods and measurement indexes of the direction error are given. The state space model of the pointing error is established. In the process of calculation, the state space model can avoid the complex numerical integration and calculate the pointing error by using the analytic expression. The point diffusion function is taken as the benchmark. The influence of the pointing error on the imaging quality is analyzed, and the existence of the pointing error can widen the point diffusion function. The error source which can cause pointing error is described and modeled. During the process of satellite launch to orbit, the error source is described and modeled. The error sources that can interfere with the satellite platform and payload can be divided into four categories: installation error and sensor error. Using probability density function to describe the pointing error source, the statistical properties of the pointing error source are obtained. The transmission process of pointing error is analyzed, and the needed transfer model in remote sensing satellite system is established. In this paper, a method of combining different types of pointing errors is proposed. This paper analyzes the synthetic method of the direction error source with correlation and the direction error source without correlation, studies and analyses the construction of the allocation budget of the direction error, and analyzes the construction steps of the direction error allocation budget. And process; According to the change of pointing error, the pointing error is divided into three parts: deviation, uniform distribution error, Gaussian error, sinusoidal error and drift error. The statistical interpretation method is analyzed. Through the analysis of concrete examples, the construction process of pointing error allocation budget is explained, and it is concluded that the pointing error allocation budget has more important significance in the preliminary design process of remote sensing satellite.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：V474.2

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