Abstract: | 本文以設計即時通訊星系為主要研究重點,探討內容是以台灣為中心,半徑2,000 km之覆蓋範圍,利用衛星軌道高度800 km、1,500 km及非對稱型800 km加1,500 km的組合,討論軌道傾角35° 之覆蓋情形,利用Walker星系進行設計,以最少衛星顆數達到任務目標,即覆蓋之時間間隙為零。 模擬的結果發現,當軌道高度為800 km時,最少需要34顆衛星才能滿足任務目標;而當軌道高度為1,500 km時,最少需要18顆衛星才能達到任務目標;若使用非對稱型星系組合,則可使用衛星總數27、32、35或39顆,四種高低組合星系來滿足任務需求,求得在固定軌道傾角條件下的最佳化結果。最後討論含有覆蓋間隙之星系,可應用的情形,及本星系可應用範圍之延伸。 The main purpose of this thesis focus on design of Microsatellite Constellation Communication, use the range of tasks to Taiwan as the center of the coverage radius of 2,000 km, adopt the circular orbit of 800 km, 1,500 km and asymmetric circular orbit combination 800 km and 1,500 km with the inclination 35° , to simulate the Walker Constellation, in order to achieve the minimum number of satellites for the purpose, to achieve mission objectives that coverage gap is zero. The calculated result shows that in the circular orbit of 800 km at less need 34 satellites, the circular orbit of 1,500 km at less need 18 satellites, then use the asymmetric circular orbit constellation can select 27, 32, 35 and 39 satellites to achieve mission objectives. Obtain the optimization constellations in fix orbit inclination. Finally, discuss contain coverage gaps of the constellation can be used situation and extension the scope of this thesis design constellations. |