3D information from 2D images recorded in the European Modular Cultivation System on the ISS

The European Modular Cultivation System (EMCS) on the ISS allows long-term biological experiments, e.g. on plants. Video cameras provide near real-time 2D images from these experiments. A method to obtain 3D coordinates and stereoscopic images from these 2D images has been developed and is described in this paper. The procedure was developed to enhance the data output of the MULTIGEN-1 experiment in 2007. One of the main objectives of the experiment was to study growth movements of the Arabidopsis plants and the effect of gravity on these. 3D data were important during parts of the experiment and the paper presents the method developed to acquire 3D data, the accuracy of the data, limitations to the technique and ways to improve the accuracy. Sequences of 3D data obtained from the MULTIGEN-1 experiment are used to illustrate the potential of this newfound capability of the EMCS. In the experiment setup, a positional depth accuracy of about ±0.4 mm for relative object distances and an absolute depth accuracy of about ±1.4 mm for time dependent phenomena was reached. The ability to both view biological specimens in 3D as well as obtaining quantitative 3D data added greatly to the scientific output of the MULTIGEN-1 experiment. The uses of the technique to other researchers and their experiments are discussed.     

天问一号着陆器大底分离安全性分析与验证

针对天问一号着陆器大底分离过程,建立大底分离动力学模型并分析分离安全性,基于分析结果设计了大底分离策略.利用大底分离动力学模型和近距离扰动气动模型,分析了分离过程的相对速度和姿态运动规律,根据大底与着陆器的正分离要求确定了大底分离的最小弹射速度.考虑到着陆器姿态运动影响分离安全性,对着陆器施加角速度阻尼控制并限制了最短...     

Scheme design of the CHANG’E-5T1 extended mission

Flight schemes for the CHANG’E-5T1 extended mission are investigated in this paper. In the flight scheme and trajectory design, the remaining propellant of the CHANG’E-5T1 mission is utilized. The CHANG’E-5T1 mission is firstly introduced with feasible flight goals derived based on the terminal trajectory and satellite status. The flight schemes are designed to include a lunar return and the libration points in the Sun-Earth/Moon and Earth-Moon systems, with an emphasis on the Earth-Moon triangle libration point thus far unexplored. Secondly, three schemes are proposed for the CHANG’E-5T1 extended mission with different flight goals. The direct libration point orbit transfer and injection method is adopted to solve the issue in the transfer trajectory design. Furthermore, an innovative concept is proposed to transfer from the Earth-Moon collinear libration point to the triangle point using the Sun-Earth/Moon libration point. Finally, the merits and drawbacks of the three schemes are discussed in terms of flight time, control energy and frequency, flight distance, and goal value. As a result, the scheme including a lunar return and the Earth-Moon L2 libration point is selected for the CHANG’E-5T1 extended mission. A flight to the Earth-Moon libration point is achieved, replicating the achievement of the ARTEMIS mission.     

CBERS-1卫星CCD相机的光学拼接、配准和定焦

文章介绍了CBERS -1卫星的CCD相机的光学拼接、配准和定焦技术 ,它们是获得高清晰度图像的关键技术。     

CBERS-1卫星的红外多光谱扫描仪设计与在轨运行

文章介绍了CBERS -1卫星红外多光谱扫描仪(IRMSS)的设计与在轨运行情况     

CBERS-1卫星IRMSS数据在冀中地区应用评价研究

通过冀中保定—廊坊地区典型研究中采用的CBERS_1卫星IRMSS数据 ,对数据图像的质量、图像信息的处理方法和专业应用潜力进行评价。通过快速评价 ,以评估IRMSS不同波段数据的应用效果 ,加速IRMSS数据的推广应用。     

双星定位法与北斗1号卫星导航系统

简要介绍了基于双星定位法的北斗 1号卫星导航系统的原理。     

民用飞机最小风险炸弹位置适航符合性验证方法研究

民用飞机最小风险炸弹位置(LRBL)是航空运营面对炸弹爆炸恐怖袭击的最后一道安全屏障,对民用飞机的安全性有重要意义。针对国内民用飞机LRBL工作缺乏适航符合性验证方法研究的现状,以AC25.795 6为指导,以满足FAR 25.795(c)(1)中有关LRBL的适航要求为目标,首次对LRBL的适航符合性验证方法进行研究;通过该工作,一方面明确了LRBL周围设备的系统安全性适航符合性验证方法,增强LRBL相关系统安全性分析工作在型号设计中的可操作性;另一方面,通过开展爆炸物在LRBL发生爆炸对飞机结构的安全性影响分析,得出了LRBL周围结构设计的适航符合性验证方法。该研究建立了面向FAR25.795(c)(1)的LRBL适航符合性验证体系,为提高产品的安全性和适航性提供了更为详实、可操作的设计方法。     

VARIABLE STRUCTURE MODEL－FOLLOWING ADAPTIVE CONTROL DESIGN FOR ROBOT MANIPULATORS

ＶＡＲＩＡＢＬＥＳＴＲＵＣＴＵＲＥＭＯＤＥＬ－ＦＯＬＬＯＷＩＮＧＡＤＡＰＴＩＶＥＣＯＮＴＲＯＬＤＥＳＩＧＮＦＯＲＲＯＢＯＴＭＡＮＩＰＵＬＡＴＯＲＳＺｈａｏＤｏｎｇｂｉａｏ；ＺｈｕＪｉａｎｙｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇｉｎ...     

复合氧化物LaM1—xNixO3（M=Fe,Ni）的晶体结构及电性的研究

采用柠檬酸络合法、固相反应法分别制备ＬａＦｅ１ｘＮｉｘＯ３和ＬａＭｎ１ｘＮｉｘＯ３。用差热分析法、Ｘ射线法、四探针电阻测量法对化合物的晶体结构、电性进行研究。结果表明：ｘ〈０．５时化合物为单相的钙钛矿结构，ＬａＦｅ１ｘＮｉｘＯ３的导电性比ＬａＭｎ１ｘＮｉｘＯ３差，导电通道为－（Ｍ、Ｎｉ）－０－；ｘ≥０．５时化合物为畸变的钙钛矿结构，两者的电性相近，通道为－（０－Ｎｉ－）－。