geometry of the sphere 中文意思是什麼
geometry of the sphere
解釋
球面幾何-
Because geometry of formation of two satellites is very weak, the solution covariance is very big and unstable in order to resolve this problem, the measurement model was transformed from cartesian coordinate system to sphere coordinate system
由於雙星編隊星座觀測的幾何結構弱，所以解算參數的協方差不穩定。為了解決這一問題，對測量方程進行球坐標變換。 -
Four parameters for determining the type of circuit of spherical four - bar linkage are defined. according to the relationship of these parameters, three types of circuit of spherical four - bar linkage are found, which is proved in view of geometry point. base on the theory of sphere triangle, an approach of identifying the circuit and branch defect of spherical four - bar linkage is proposed
首先提出了四個迴路類型判斷參數，根西安理工大學博士學位論文據這些參數之間的關系，將球面4r機構迴路分為三種類型，並從幾何的觀點進行了證明;然後基於球面三角理論，提出了球面4r機構迴路及分支缺陷識別的轉角符號法，而由空間第一組機構與其等效球面4r機構迴路特性的等效性，此方法對空間第一組機構的迴路和分支缺陷的識別同樣有效。 -
The methods that represent geometry elements such as line, circle and arc, plan, cylinder, cone and sphere in nurbs form are studied. meanwhile, the calculating process that interpose to nurbs curve and surface are advanced. to the processed surface, the paper brings forward a method to distill its character ( plan, cylinder and sphere ) by the main curvature of surface using its local differential coefficient geometry characteristic
對nurbs的直線、圓和圓弧、平面、柱面和球面等的表示方法作了理論研究，同時對nurbs曲線曲面的進行插值的計算，插值后的nurbs曲面，利用其表面局部微分幾何特性，提出依據曲面的主曲率來提取特徵面（平面、柱面和球面）的方法。 -
This dissertation established a novel distributed spaceborne sar simulation system based on the high level architecture ( hla ). this dissertation developed a mathematical model of instantaneous sphere earth model and instantaneous circle orbit model for the geometry system between the satellite platform and the targets on earth based on the satellite platform ’ s orbit features and sar system ’ s operational characteristics, unlike the traditional sphere earth model and circle orbit model
本文從建立精確的、易於模擬的星地幾何關系入手，舍棄了傳統的星載sar研究中的球型地球模型和圓形軌道模型，根據星載sar的軌道特點和sar的工作特點，對局部球型地球模型進行改進，建立了在瞬時球型地球模型和瞬時圓形軌道模型下的星載sar模擬。 -
This dissertation adopts the modularization programming method to develop the spaceborne sar system design and simulation software, which obtains the windows common interface and logical integrated structure, convenient for usage, maintenance and function extension. 2. as for the earth model and orbit model, according to the properties of spaceborne sar operation, in this dissertation, we reject the sphere earth model and circle orbit model and present a novel way to solve spaceborne geometry relations between radar and target by three ellipses, and achieve the way to determine the target position by antenna pointing direction
在地球模型和軌道模型方面，論文根據星載合成孔徑雷達工作的特點，摒棄了球地球和圓軌道的傳統模型，創新性的採用三個橢圓解決了星載雷達的星地幾何關系問題，得到了在地球橢球模型和橢圓軌道模型下由雷達天線指向確定目標坐標的方法，為星載合成孔徑雷達系統設計與模擬提供了更為精確的幾何基礎。
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