本文選題：合成孔徑雷達干涉測量 + 基線估計��； 參考：《中國地質(zhì)大學(北京)》2017年碩士論文

【摘要】：星載合成孔徑雷達干涉測量(Synthetic Aperture Radar Interferometry,InSAR)是一種重要的大范圍形變監(jiān)測技術(shù)。不同誤差源會使測量結(jié)果產(chǎn)生偏差,當形變作為主要信息時,InSAR數(shù)據(jù)處理的目的是消除或者減弱其他信號的影響。軌道誤差以近似線性趨勢存在于地形高程圖和形變圖中。目前常用的減弱軌道誤差的方法是對殘余相位做快速傅里葉變換計算殘余基線誤差;或者,對殘余相位做二次曲面擬合。這兩種方法對多數(shù)情況是適用的,但是不適合大氣傳播延遲效應嚴重的情況,也不適合大范圍的形變信號如構(gòu)造運動或者潮汐等和軌道誤差有相同表現(xiàn)特征的情況。時序InSAR技術(shù)出現(xiàn)之后,采用最小二乘等方法計算干涉圖中的基線誤差殘余相位,利用不同時空基線的組合,根據(jù)平差原理,計算準絕對軌道誤差,對軌道精度進行交叉驗證來評價其可靠性。也有研究建立模型聯(lián)合解算形變速率和軌道誤差,還有研究認為軌道誤差在時間上沒有相關(guān)性,在時序InSAR技術(shù)中可以忽略軌道誤差的影響。但是,對于高精度的形變監(jiān)測,軌道誤差對結(jié)果的影響不可忽略,因而對軌道誤差進行建模和分析是十分必要的。本文根據(jù)目前基線誤差和軌道誤差建模與分析的現(xiàn)狀,針對InSAR中的軌道誤差進行了研究,主要工作如下:1.詳細闡述了基于軌道信息、干涉圖信息和地面控制點信息的三種基線估計方法的原理、適用條件和實現(xiàn)過程,用Matlab編寫程序?qū)崿F(xiàn)了三種方法。應用高分三號數(shù)據(jù)對基線估計的三種方法進行了分析驗證,分析了不同方法的效果和適用性。2.提出了基于地面控制點相位殘差定權(quán)的基線估計方法,推導了算法的數(shù)學模型,結(jié)合模擬數(shù)據(jù)論證了該方法在一定程度上減弱了大氣傳播延遲相位和形變相位對基線估計的影響。3.利用軌道誤差網(wǎng)平差原理,實現(xiàn)了對Los Angeles地區(qū)的Envisat ASAR數(shù)據(jù)的軌道誤差網(wǎng)平差,利用數(shù)據(jù)探測的方法,剔除觀測值中的粗差,獲得較為可靠的軌道誤差。
[Abstract]:Spaceborne synthetic Aperture Radar Interferometry (InSAR) is an important deformation monitoring technique. Different error sources will cause deviation of measurement results. When deformation is the main information, the purpose of InSAR data processing is to eliminate or weaken the influence of other signals. The orbit error exists in the topographic elevation map and the deformation map as an approximate linear trend. At present, the commonly used method to reduce orbit error is to calculate the residual baseline error by fast Fourier transform on the residual phase, or to do the Quadric surface fitting to the residual phase. These two methods are suitable for most cases, but they are not suitable for serious atmospheric propagation delay effects or for large scale deformation signals such as tectonic motions or tides with the same characteristics as orbital errors. After the time series InSAR technology appeared, the residual phase of baseline error in interferogram was calculated by least square method, and the quasi-absolute orbit error was calculated according to the principle of adjustment by using the combination of different space-time baselines. The track accuracy is cross-validated to evaluate its reliability. There are also some studies on the joint calculation of deformation rate and orbit error, and the conclusion that orbit error has no correlation in time, and the influence of orbit error can be ignored in time series InSAR technology. However, for high precision deformation monitoring, the influence of orbit error on the result can not be ignored, so it is necessary to model and analyze orbit error. According to the current situation of baseline error and orbit error modeling and analysis, the orbit error in InSAR is studied in this paper. The main work is as follows: 1. The principle, applicable conditions and realization process of three baseline estimation methods based on orbit information, interferogram information and ground control point information are described in detail. The three methods are realized by programming with Matlab. Three methods of baseline estimation are analyzed and verified by using the data of high score three. The effects and applicability of different methods are analyzed. A baseline estimation method based on phase residuals weight of ground control points is proposed, and the mathematical model of the algorithm is derived. Combined with the simulation data, it is demonstrated that this method weakens the influence of atmospheric propagation delay phase and deformation phase on baseline estimation to a certain extent. The orbit error net adjustment of Envisat ASAR data in Los Angeles region is realized by using the principle of orbit error net adjustment. By using the method of data detection, the gross error in the observed value is eliminated and the more reliable orbit error is obtained.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P207.1;P237

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