首向精度 的英文怎麼說
中文拼音 [shǒuxiàngjīngdù]
首向精度
英文
heading accuracy-
And understanding and studying the spectral features and variation rules of geo - targets in the experimental area, raising that it is the basis of geo - targets information collection with imaging spectrometer data to understand spectral features and variation rules of geo - targets, realizing that in a great extent spectral - integrated - form - based classification method can remove the phenomenon of " different spectrum with same objects " resulted from reflection ratio curve translation because of the angle change among sensor, targets and observation direction, and the average and variance images can be introduced to solve the problem of two kinds of geo - target with similar spectral forms and much different values of whole reflection ratio. it is suggested that " red edge " range bands of vegetation, which has close relationship with vegetation cover and biomass, is the main characteristic bands and important basis for careful vegetation classification and quantitative retrieval, and pixel - based derivative spectral analysis is very useful for removing the effects of soil background values and quantitatively retrieving vegetation biomass and cover. the remote sense quantitative retrieval model is developed for main appraisable factors of desertification monitoring assessment with imaging spectrometer data and then the applicability of model is analyzed
研究結果如下：首先針對荒漠化地區的地物特徵，對高光譜數據不同波段的數據質量、波段組合進行了評價，提出了適用於荒漠化監測的基本波段選擇集；初步了解和掌握了研究地區的地物光譜特性及變異規律，進一步明確了掌握地物光譜特徵和變異規律是用成像光譜儀數據提取地物信息的基礎；發現了基於光譜整體形狀的分類方法在很大程度上能夠消除由於傳感器、地物目標觀測方向之間的角度變化引起的反射率曲線整體平移的「同物異譜」現象，對于譜形相似而整體反射率的值相差較大的兩類地物，通過引入均值和方差圖像參與分類得到解決；研究還表明在植被「紅邊」范圍內的波段是進行荒漠化監測的主要特徵波段，這些波段與植被生物量和蓋度都有密切的關系，是開展精細植被分類研究和植被定量反演的重要基礎；像元的導數光譜分析可以消除土壤背景的影響，是進行植被生物量和蓋度定量反演的有力工具；建立了荒漠化監測主要評價因子的定量反演模型，並分析了模型的適用性。At first, this paper analyzes the factors of water - sand influencing water level of yellow river and the feasibility just using the factors of water - sand to study water level, and collects the corresponding data ; secondly, because there are strong nonlinear relation in the corresponding data, by meticulous theory analysis, this paper integrates basic nonlinear analysis method, theory of random analysis, method of least squares and so on. it puts forward a method which can get the high accuracy simulation of the data, perfects the multi - factor analysis of variable ( over three factors ) of the statistic ; thirdly, it applies the method to the approximation of corresponding water level process which belong to the capacity of sand of middle - high and middle - low, and get the high - accuracy simulation about the typical nonlinear relation ; at last, this paper definitudes the main influence mode that the capacity of sand. it mainly unite with other factors to work on the water level in the yellow river lower reaches ; mor eover, this paper analyzes the difficult point and the direction of improvement to realize the accuracy forecasting of the flood level of erodible - bed channel
首先，系統分析了影響黃河水位的水沙因素，及僅用水沙因素有效研究水位的可行性，並按變量對應思想採集它們的相應數據；其次，由於相應水位過程數據中含極強的非線性關系，本論文經細致的理論分析，將基本的非線性分析方法、統計建模方法、隨機分析理論、最小均方誤差原則等等數學理論及方法有機揉合，提出了能有效實現這類數據高精度擬合的分層篩選法，並改進了統計學中多因子（三個以上）方差分析法；再次，將這一方法用於黃河中高及中低含沙類洪水相應水位過程的擬合，實現了這一典型非線性關系的高精度擬合，各年汛期上下游相應洪水位過程的擬合誤差都較小；最後，明確黃河下游含沙量對水位的主要影響方式，即含沙量主要是與其它因素聯合對水位作用；另外分析了要實現變動河床洪水位過程準確預報的困難所在及改進方向。First, it was taken that a discuss about the effects of geometry parameters of each piezocrystal on direction parameters ( main lobe width, side lobe amplitude, elimination of grating lobes ), amplitude of ultrasonic pressure, element viberation pattern, mutual radiation among elements, efficient test regions, ability to keep accurate and near - field distance and so on. based on the direction of ultrasonic field in ulpa deduced by ourselves. in addition, on the base of integrating all kinds of factors, it was put forward that the principle and method for optimized design of geometry parameters of piezocrystals in ulpa transducer, and its design programme and interface were compiled
首先在推導超聲相控線陣換能器聲場的指向性的基礎上，就各個晶片幾何參數對指向性指標（主瓣寬度、旁瓣幅度、消除柵瓣） 、聲壓幅值、陣元振動模式、陣元間互輻射、有效檢測區域、精確控制能力、近場長度等方面的影響進行了論述，並在綜合各方面影響的基礎上，提出了晶片幾何參數優化設計的原則和方法，編寫了設計程序和界面。Its main contributions include the following several aspects : firstly, the dissertation constructs the mathematic model of short baseline orientation determination using two geostationary satellites and analyses the applicable conditions of carrier phase interferometry. orientation determination precision is analysed in depth through both the conventional linearized method and monte - carlo computer simulation method, and the mathematical simulation results show that the linearized method has the shortcoming of fairly low elevation error analysis precision in high latitude area so as not to be very appropriate there. by analyzing the definite factors influencing orientation precision, the dissertation develops the concept of orientation dilution of precision, which uncovers the internal cause of exotic error behavior of bi - satellite orientation, and has important guiding significance for practical engineering applications
本文系統地研究了基於「北斗一號」衛星載波相位干涉測量原理實現地球靜止雙星定向的相關技術，主要研究成果包括以下幾方面:首先，建立了利用兩顆地球靜止軌道衛星進行短基線定向的數學模型，分析了載波相位干涉測量的適用條件;採用傳統的線性化解析法及蒙特卡洛隨機模擬法兩種途徑對雙星定向的精度進行了詳細分析，數學模擬結果表明在高緯度地區線性化解析法由於俯仰角誤差分析精度略有下降而不太適合;在分析定向精度確定性影響因素的基礎上，提出了雙星定向精度衰減因子odop的概念，揭示了雙星定向誤差特殊表現的內部機理，對實際工程應用具有重要的指導意義。First of all, the assembly model of dfa is established and the data structure of the model is proposed ; in order to redesign product and structures and select optimized assembly plans, an assemblability evaluation system is constructed. secondly, assembly process planning is analyzed, including assembly path planning and assembly sequence planning ; and then the thesis brings forward the way of 11 - tuple to represent the movement of assembly / disassembly of assembly elements. in the end, this paper makes an research on the technology of interference checking, raised a kind of algorithm of swift interference checking based on envelops bounding box decomposition, hence, the accuracy and efficiency of the algorithm is improved dramatically
首先建立了面向裝配設計的裝配模型，給出了它的數據結構；接著從面向產品結構和裝配工藝過程兩方面再設計的角度，構建了裝配性評價體系；接著闡述裝配工藝規劃技術，包括裝配路徑規劃和裝配順序規劃；然後提出了11元組法來表示裝配元件的裝拆運動；最後對干涉檢驗技術進行了研究，採用一種基於包容盒逐層的快速干涉檢查演算法，提高演算法的精度和效率。This paper introduces a static state directional accuracy of gun measuring technique, on this basement, we has used laser photo - electricity theodolite, and has designed the big gun ' s measuring accessory
本文首先對坦克炮管靜態定向精度的測量方法進行了較全面地介紹和比較，在此基礎上，選用了激光光電經緯儀，設計了炮管上的測量附件。Firstly, the paper studies radio direction finding theory, and makes comparison among the existing direction finding systems. it also puts forward the ideas of an advanced short - wave monitor and meterage system to satisfy requirement, and introduces the research emphasis of the paper
首先，對無線電測向理論進行了研究，比較了現有的小基礎測向設備，為了進一步提高測向精度和速度，提出了一種新型的短波監測設備的研製設想，並對本文的研究重點做了介紹。The first part is " know life experience ". the author recalls and summarizes the theories on experience in the eastern and western culture ; then, the author analyses the advancing of china ' s characteristic way of thinking - the original oneness of heaven and man in our modern time. the author also points out that " the post subjectivity of the oneness of heaven and man " promotes the development of subjectivity as well as the ideal choice of avoiding the spiritual crisis in the west
在論文第一部分「識讀生命體驗」 ，首先從縱向的歷史發展角度對中西方文化中的體驗和生命的理論予以梳理，感悟時代變遷和文化、思維方式對教育的影響；然後就中國特有的直覺體悟的圓融思維方式在現代背景中的發展予以分析，認為「後主體性的天人合一」是一種既可促進人的主體性發展，又可避免類似西方精神危機的選擇。The parametric speed of the curve is firstly approximated by the bezier polynomial which takes the lengths of control polygon ' s edges of the direction curve of normal as bezier coordinates. then the corresponding geometric offset approximation algorithm is given. moreover, an offset approximation with high precision is obtained by degree elevation of the direction curve of normal
首先利用以法矢方向曲線的控制多邊形邊長為b zier縱標的b zier多項式來逼近曲線的參數速度，給出了相應的幾何等距逼近演算法，進一步結合法矢方向曲線的升階獲得了高精度逼近In this application, the lorentz force generated by the interaction between the current in the wire and the geomagnetic field produces an electro - dynamic drag leading to a fast orbital decay. in this paper, we make an intensive study of the process of de - orbiting using electro - dynamic tether system. the concrete work includes : firstly, i have studied the basic principle of how to generate the electro - dynamic drag, modeled via accuracy geomagnetism, made a concrete analysis of the de - orbiting duration, the magnitude and direction of electro - dynamic drag under the action of the dipole and accurate geomagnetic models, set up a counterbalance between electro - dynamic torque and gravity gradient torque, emulate the de - orbiting process of spacecraft, and compared the change of six orbital factors and the de - orbiting duration under the action of the dipole and accurate geomagnetic models
本文對基於電動力纜繩的航天器離軌過程進行了深入研究，具體工作如下:首先，本文研究了電動力纜繩產生電動力拉力的基本原理，建立了精確地磁場模型;分別在偶極子模型和精確地磁場模型作用下，對電動力拉力的大小、方向、離軌時間及電動力纜繩傾角的大小進行了計算分析;建立了電動力力矩與纜繩系統重力梯度力矩的平衡關系;分析了電動力力矩為系統提供能量的原理;最後分別在偶極子地磁場模型和精確地磁場模型作用下，對受電動力纜繩作用的航天器的離軌過程進行模擬，分析了在不同精度地磁場模型下，航天器離軌過程中各軌道參數的變化情況，並比較了不同模型對離軌時間的影響。These analysis is based on a great deal of test. some conclusion is : geometry dilution of precision and the number of satellites can be used to pick out some abnormal points. to group the data according to the vertical dilution of precision can also pick out some abnormal points
通過對ag132大量實驗和精度分析，提出了可以通過gps信號接收時的幾何精度因子、衛星個數等首先剔除浙江大學博士學位論文摘要一批gps信號中的異常值，然後可以通過垂向的按幾何精度因子分組判別法剔除一些異常值。Firstly, while the nominal model is used, the filtering effect is very good. secondly, when the system model is n ' t definite, the filtered heading angle and rudder angle are steady in the error range. finally, when the complicated nonlinear wave model replaces the linear wave model, the filtering effect is also steady, and the estimate precision is high
首先，模擬是在名義模型的情況下進行的，此時h _濾波器的濾波效果很好；其次，我們在系統模型具有攝動的情況下進行模擬，此時經h _濾波器濾波后的航向輸出和舵令輸出基本能夠達到穩定；最後，我們採用較復雜的非線性海浪模型代替線性海浪模型進行模擬， h _濾波器的濾波效果也是比較穩定的，並且估計精度較高。Considering the characteristics of internal force and structures of simply supported pc bridges, a novel automatically step - up method ( asum ), taking into account the influence of steel arrangement, steel ratio, stress losses of tendons and time - dependent concrete modulus, to analyze creep and shrinkage effects is presented. this method accepts all kinds of expressions of creep and shrinkage, and it is easy to calculate total stress, strain of concrete and steel and deflection of bridge at any time, the expected prediction accuracy will be obtained by further dividing the time - step within duration
首先，針對預應力混凝土簡支梁橋的受力特徵和構造特點，提出了徐變效應分析的全量形式自動遞進法，可考慮截面上鋼筋位置、配筋率、預應力鋼筋鬆弛、混凝土彈性模量隨時間變化等影響，且計算式可適用於任何形式的收縮、徐變特性表達式；建立的公式可方便地求解任意時刻混凝土、鋼筋的應力與應變和跨中梁體的豎向變形，計算精度可方便地通過計算時段的細分來控制，直至給出滿意的結果。First in this paper we analyze the current situation in samples capturing of palmprint diagnosis, as the existed systems have lots of disadvantages, the demands of sampling capture cannot be fulfilled, we design a capturing system which has a relative high precise rate, and high resolution, and is based on multi - lighting images fusion, and really be able to provide excellent palmprint samples for the later process of palmprint diagnosis
本文首先分析了目前掌紋診病圖像樣本的採集現狀，目前各種採集系統存在諸多難以克服的缺陷，無法滿足現階段掌紋診病對于掌紋圖像樣本要求，因此設計了一套高精度、高解析度的、基於多方向光源圖像融合的掌紋採集系統，滿足了掌紋診病後期診斷對高質量圖像的要求。In the analysis, a cfst arch ( single tube ) is first divided into a finite number of straight beam elements. according to the virtual work principle and the modified newton - raphson iteration method the tangent stiffness matrix considering double nonlinear properties is established. with regard to the non - equilibrium forces, the material nonlinear property along the height of the section and the length of the element is considered and the computation accuracy is improved as a result
本文首先將拱肋劃分為一系列的直梁單元，運用虛功原理和修正newton - raphan數值迭代演算法的基本原理準確推導了拱肋直梁單元的非線性切線剛度矩陣；在不平衡力方面考慮了沿截面高度和單元長度方向材料非線性的發展過程，提高了計算精度；再根據得到的切線剛度矩陣採用荷載增量步內修正newton - raphan迭代的增量迭代法進行了求解。Chapter 7 introduces and analyzes some timing error detection and feed - forward timing recovery algorithms for gmsk signal. the auto - correlation method is improved by using a post - filter. simulation results show that the improved method has better estimation accuracy
首先分析比較了常見的gmsk符號同步的定時誤差檢測器演算法和前向定時參數估計演算法，並用后濾波的方法對定時參數估計的自相關法提出了改進，提高了演算法的估計精度。By an iterative procedure, this method is able to recover the continuous phase distribution of all steps with same height. 2. it introduces a fast iterative pairwise registration method
本文首次提出了一種只需要一次測量即可完成高度和橫向坐標校準的方法，該方法在保證精度的同時提高了校準過程的自動化程度。The system " s programs is wrote using the language of borland c + + builder, and the part of software design firstly introduced the idea of software engineering and object - oriented method and their applications in the system, then dissertated the accomplishment approach of industrial pc communicating with transducer based on uss protocol and rs - 485 network, finally introduced the design of calibration and test software, besides, it illustrated partial calibration and measure result coining from this system, which indicated that the system reached the design requirement
軟體設計部分採用面向對象、可視化設計的快速應用開發軟體平臺borlandc + + builder實現，首先介紹了軟體工程思想和面向對象方法及其在該系統軟體設計中的應用，然後論述了工控機同西門子masterdriver變頻器之間基於uss協議的rs ? 485通信的實現方法，最後又介紹了系統計量軟體和測試軟體的設計。此外，文中還給出了該系統計量和測試的部分結果，表明其達到了要求的測試精度。But, pso convergence ' s speed become slow in latter iterative phase, and pso is easy to fall into local optimization. at present, some scholars improve base pso mostly using 3 methods : disperse algorithm, increase convergence speed, enhance particle ' kinds. in the paper, i put forward 2 methods aiming at local best resutl but not whole best result. i modify base pso using the last method. some scholars put forward times initializations, so i select best result after circulating some times to be a parameter of formula. first, put particle into some small region, and ensure every region having one paticle at least. second, every region ' s particle has probability transfer other regions. although increase running time, enhance particle ' kinds, decrese the probability of convergence far from whole best result. nerms ( network educational resource management system ) is one of the research projects in the science and technology development planning of jilin province. the aim of nerms is to organize and manage various twelve kinds of network educational resources effectively so that people can share and gain them easily and efficiently, so as to quicken the development of network education
但粒子群演算法仍存在如下不足:首先在多峰的情況下，粒子群有可能錯過全局最優解，遠離最優解的空間，最終得到局部最優解;其次在演算法收斂的情況下，由於所有的粒子都向最優解的方向群游，所有的粒子趨向同一，失去了粒子間解的多樣性，使得後期的收斂速度明顯變慢，同時演算法收斂到一定精度時，演算法無法繼續優化，本文對原始粒子群演算法提出了二點改進方案: 1 .演算法迭代到一定代數后，把此時找到的全局最優解當作速度更新公式的另一參數（本文稱之為階段最優解）再進行迭代; 2 .每次迭代過程中除最優解以外的每個粒子都有一定概率「變異」到一個步長以外的區域，其中「變異」的粒子在每一維上都隨機生成一個步長。This paper focuses on the theories and controller designs of forward neural netwoks ? bp network. at first, the structure and algorithms of bp network are deeply researched, the ralations between momentum factor and convergence speed 、 convergence accuracy are revealed and a kind of improved bp algorithm is presented. then the identification method based on bp network with adaptive learning rate is studied and the simulaton indicates it can adaptively track the plant
本課題主要針對前向神經網路? ? bp網路理論與控制器設計進行研究。首先重點對bp網路的結構和學習演算法進行了深入研究，揭示了動量因子與網路收斂速度、收斂精度之間的關系，並提出了一種改進的演算法。然後研究了採用自適應學習率bp網路的辨識方法，模擬說明其可以自適應地跟蹤辨識被控對象。分享友人