International commercial satellite launching service market 國際商業衛星發射服務市場
Foreign commercial satellite manufacturers are seeking potential acquisitions and partners in china 國外商業衛星生產商正在中國尋找潛在的客戶與合作伙伴。
Xichang satellite launch center is m higher modernize grade , able to launch multi - model of rocket ; it is main base to opening and take on launch business satellite in china 西昌衛星發射中心是我國目前現代化程度較高、具備多種火箭型號發射能力的綜合性發射場;也是我國對外開放,承擔發射商業衛星任務的主要基地。
Last may , chinese technicians launched a chinese - manufactured communications satellite for nigeria , marking the first time china had built a commercial satellite and sent it into orbit on contract for another country 去年5月,中國為尼日利亞發射了一顆中國研制的通信衛星,這也是中國制造并送上軌道供他國使用的第一顆商業衛星。
The pentagon buys as much as four - fifths of its bandwidth from commercial satellite operators , and the launch of a new generation of military - communications satellites is unlikely to satisfy the demand for capacity , given the need to pipe full - motion video back from uavs 為此,美國五角大樓從商業衛星運營商購買了五分之四的帶寬,而且只要我們仍需要把完全連貫的視頻資料從無人機傳輸到地面,新一代的軍用通信衛星的發射也不太可能滿足對帶寬能力的需求。
Although china already had the high - precision missile guidance technology , people with even slight scientific knowledge will know that commercial satellite launches require only an economic and rational guidance system with moderate precision , instead of the high - precision guidance system needed for ballistic missiles 盡管中國早已擁有高精度的導彈制導技術,但稍具科技常識的人都知道,商業衛星發射決定了只需要采用精度適中、經濟合理的制導系統,而沒有必要采用彈道導彈那樣高精度的制導系統。
Investigation using remote sensing ( rs ) technology can breakthrough the limits of traditional methods , make full use of its capability of integration , visualization , rapidity and vast - dimensions analysis , and get better results the paper takes the up - to - date landsat - 7 etm + data , which is the most widely used , and quickbird data , which has the highest resolution nowadays , and according the features of the data and landslides , processes the quickbird data with 1 : 10 000 dem orthophoto correction and the landsat - 7 etm + data as follows : ( 1 ) selecting optimal spectrum band : selects 753 bands as the optimal bands ; ( 2 ) image intensifying : selects the principle components processing method on the basis of comparing several image intensifying methods ; ( 3 ) rigour geometric direction : corrects the geometric distortion of the map ; ( 4 ) image fusion : mainly takes his space transform fusion and resolution fusion method , and acquires maps with higher spectrum resolution as well as space resolution . after that , the visual effect of the image has been enhanced , and the interpretation precision 采用遙感技術,可以突破傳統調查方法的限制,發揮其宏觀、綜合、直觀、快速的特點,取得更好的效果。論文選取目前應用最廣的陸地衛星最新系列landsat - 7etm +數據和空間分辨率最高的商業衛星quickbird數據作為主要的數據源,根據數據的特點及滑坡災害應用特征,對quickbird遙感數據則基于1 : 10000dem進行了正射校正,對etm +遙感數據進行了波段優選,選取了753作為最佳組合波段;圖像增強,通過各種增強處理方法的效果對比,選擇主成分分析法對圖像進行增強;幾何精校正,糾正圖像的幾何變形;影像融合,主要選取了效果較好的his空間變換融合和分辨率融合,得到的圖像既具有較高的光譜分辨率,同時也具有較高的空間分辨率。經過上述數字處理,較好地改善了圖像的視覺效果,提高了圖像解譯的精度。