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水深测量的误差因子分析 被引量:33
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作者 林珲 吴立新 +2 位作者 方兆宝 刘基余 李红兵 《海洋测绘》 2005年第2期1-5,共5页
简述了现代海洋水深测量的基本特点;定性和定量地分析了由船速效应、波浪效应、定位中心偏心效应,以及测深仪发射声波延迟效应等测量环境效应引起的测量误差;推导了测量环境效应误差改正公式。计算机数值模拟结果表明,波浪效应是引起水... 简述了现代海洋水深测量的基本特点;定性和定量地分析了由船速效应、波浪效应、定位中心偏心效应,以及测深仪发射声波延迟效应等测量环境效应引起的测量误差;推导了测量环境效应误差改正公式。计算机数值模拟结果表明,波浪效应是引起水深测量误差的主要因子。针对海洋水深测量环境效应的特点,提出了一些提高测量精度的方案和建议。 展开更多
关键词 水深测量 测量误差因子 测量环境效应 误差改正
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A New Method of Profiling Remote-Sensing Reflectance of Coastal Waters
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作者 李铜基 陈清莲 +1 位作者 汪小勇 杨安安 《Marine Science Bulletin》 CAS 2005年第1期37-44,共8页
The profiling method is the first method to select in measuring the remote-sensing reflectance. In the light of the characteristics of China’s coastal waters, we develop a new method to compensate the environment’s ... The profiling method is the first method to select in measuring the remote-sensing reflectance. In the light of the characteristics of China’s coastal waters, we develop a new method to compensate the environment’s effects with the downwelling (λ)rsi r radiance’s profile and to estimate the underwater remote-sensing reflectance r. (λ)rsT he result indicates that the relative deviation of repetitious r in one station is around 10 %. 展开更多
关键词 profiling method remote-sensing reflectance METHOD
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An introduction to the novel vacuum plume effects experimental system 被引量:4
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作者 CAI Guo Biao LING Gui Long HE Bi Jiao 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2016年第6期953-960,共8页
This paper introduces a newly developed vacuum Plume effects Experimental System(PES) used for plume effect tests of rocket engines and vacuum heat tests of satellites. The design level, manufacturing technique, and t... This paper introduces a newly developed vacuum Plume effects Experimental System(PES) used for plume effect tests of rocket engines and vacuum heat tests of satellites. The design level, manufacturing technique, and testing capabilities of the PES have reached a highly advanced level at home and abroad. The PES mainly consists of a vacuum chamber, vacuum acquisition system, nitrogen system, helium system, and parameter measurement system. A breakthrough was obtained on the Large Scale Cryo-Pumping System, which was based on a combined liquid nitrogen and liquid helium heat sink. An internal cryopump with a limiting temperature of 4.2 K and an efficient absorption area of 305 m2 was developed. The absorption capability of the cryopump was above 7×107 L/s. Vacuum plume tests were performed in the temperature ranges of ambient temperature, liquid nitrogen, and liquid helium. The experimental results showed that the plume test capability of PES is higher than that of similar foreign equipment STG and CHAFF-4. For 2 g/s and 117 N rocket engines, the dynamic vacuum degree of environment was 8.0×10?4 Pa(approximately 137 km height) and 1.1×10?2 Pa(approximately 106 km height), respectively. 展开更多
关键词 vacuum plume effect liquid nitrogen heat sink liquid helium heat sink plume absorption pump
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