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用差分式GPS对飞机位置误差和气流角度的同时校准
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作者 达社会 《试飞研究》 1998年第3期24-33,48,共11页
本文论述了全压静压管位置误差和攻角及侧滑角传感器的校准曲线的同步测定技术的发展情况。SCADS技术涉及到飞机飞行在一个“风箱”模型中时,记录的一组标准飞行试验数据和差分全球定位系统的量度。这种同步校准技术为位置误差和... 本文论述了全压静压管位置误差和攻角及侧滑角传感器的校准曲线的同步测定技术的发展情况。SCADS技术涉及到飞机飞行在一个“风箱”模型中时,记录的一组标准飞行试验数据和差分全球定位系统的量度。这种同步校准技术为位置误差和气流角度的修正提供了校准程序,并且排除了在试验中接近地面飞行时的危险。 展开更多
关键词 差分式GPS 同步校准 空中数据系统 飞机位置
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Design and Applications of Land Resources and Ecological Environment Information System: A Case Study of Zigui County in the Three Gorges Area of China 被引量:25
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作者 ZHOUYONG WANGSHANQIN +1 位作者 DONGYUANHUA YANGLINZHANG 《Pedosphere》 SCIE CAS CSCD 2002年第4期373-381,共9页
The design and applications of a land information system built upon ARC/INFO and ArcView are presented. The proposed system not only maintains all the advantages of the more conventional implementations but also enhan... The design and applications of a land information system built upon ARC/INFO and ArcView are presented. The proposed system not only maintains all the advantages of the more conventional implementations but also enhances them in the following ways: 1) the application program interfaces (API) are used to transmit data and messages among different parts of the system; 2) the integrated system can support studies on land evaluations and ecological analyses by efficient management of attribute and spatial data and 3) correspondingly, spatial records and attributive records are linked by the same identifiers (ID). A case study application in Zigui County of the Three Gorges Area in China demonstrates that the system could employ land-use maps and land property data to predicate and analyze the land utilization changes in the past, present and future. The ecological environment analysis can be carried out with the data of land, economics and terrain map used, showing that the system can be widely applied, especially to survey land and environment resources in the countryside area. 展开更多
关键词 attribute database ecological environment land resources spatial database
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