x
uploads/subastral.jpg

subastral adj.星下的,天下的,地上的。

subatmospheric

So combine the item of “ space targets surveillance photoelectricity telescopes arrays system ” , this thesis does research in developing space targets visualization system . the main achievement in this thesis can be summarized as follows : 1 . expatiate e the basic theory of satellite track dynamic , analyse the orbit characteristic of two - body problem and launch window , subastral point calculation , visibility and coverage analysis , two - line element sets 本文結合“空間目標監視光電望遠鏡陣系統”課題,進行了空間目標可視化系統的設計和研究,主要作了以下幾方面的工作: 1 、闡述了衛星軌道動力學的基本原理,分析了二體軌道特性和發射窗口的基本特性,星下點軌跡計算、可見性和覆蓋分析和兩行根數。

4 . realize the render and display of subastral point tracks on the global satellite images . also include the display of satellite coverage ; realize the render of the three - dimension scene in which satellites orbiting the earth , including the render of satellite track and satellite model ; realize the render of scene based on the ground viewpoint , including the render of sky background , satellite ana satellite track 4 、實現了在全球衛星影像地圖上衛星的星下點軌跡的繪制和顯示,以及覆蓋區域的顯示;實現了衛星圍繞地球旋轉的三維場景顯示、衛星軌跡顯示以及衛星模型顯示;實現了以地面觀測站為觀測視點的場景顯示,地面以及天空背景顯示,衛星及衛星軌跡顯示。

3 . expatiated on the application theory of basic orbit , including subastral point calculation , visibility analysis , coverage evaluating and spacecraft life - span estimate 3 、闡述了基本軌道應用分析理論,包括星下點軌跡計算、可見性分析、覆蓋評估和軌道壽命估算。