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Attitude control for part actuator failure of agile small satellite 被引量:16
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作者 J.R.Zhang A.Rachid Y.Zhang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2008年第4期463-468,共6页
The stability and singularity problem of agile small satellite (ASS) with actuator failure is discussed in this paper. Firstly, the three-axis stabilized controller of an ASS is designed, where micro control moment ... The stability and singularity problem of agile small satellite (ASS) with actuator failure is discussed in this paper. Firstly, the three-axis stabilized controller of an ASS is designed, where micro control moment gyros (MCMG's) in pyramid configuration (PC) is used as the actuator. By using the same controller and steering law, the control results before and after one gyro fails are compared by simulation. The variation of singular momentum envelope before and after one gyro fails is also compared. The simulation results show that the failure intensively decreases the capacity of output torque, which leads to the emergence of more singular points and the rapid saturation of MCMG's. Finally, the parameters of system controller are changed to compare the control effect. 展开更多
关键词 Micro control moment gyros (MCMG's) · Gyro failure ·Singularity analysis · Agile small satellite
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Fusion and Classification of Beijing-1 Small Satellite Remote Sensing Image for Land Cover Monitoring in Mining Area 被引量:1
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作者 DU Peijun YUAN Linshan +1 位作者 XIA Junshi HE Jianguo 《Chinese Geographical Science》 SCIE CSCD 2011年第6期656-665,共10页
In order to promote the application of Beijing-1 small satellite(BJ-1) remote sensing data,the multispectral and panchromatic images captured by BJ-1 were used for land cover classification in Pangzhuang Coal Mining.A... In order to promote the application of Beijing-1 small satellite(BJ-1) remote sensing data,the multispectral and panchromatic images captured by BJ-1 were used for land cover classification in Pangzhuang Coal Mining.An improved Intensity-Hue-Saturation(IHS) fusion algorithm is proposed to fuse panchromatic and multispectral images,in which intensity component and panchromatic image are combined using the weights determined by edge pixels in the panchromatic image identified by grey absolute correlation degree.This improved IHS fusion algorithm outper-forms traditional IHS fusion method to a certain extent,evidenced by its ability in preserving spectral information and enhancing spatial details.Dempster-Shafer(D-S) evidence theory was adopted to combine the outputs of three member classifiers to generate the final classification map with higher accuracy than that by any individual classifier.Based on this study,we conclude that Beijing-1 small satellite remote sensing images are useful to monitor and analyze land cover change and ecological environment degradation in mining areas,and the proposed fusion algorithms at data and decision levels can integrate the advantages of multi-resolution images and multiple classifiers,improve the overall accuracy and produce a more reliable land cover map. 展开更多
关键词 grey absolute correlation degree Intensity-Hue-Saturation (IHS) transformation D-S evidence theory Beijing- 1 small satellite
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Reflection on Small Satellite Constellation Operations from the Commercial Space Perspective 被引量:1
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作者 WANG Changqing YUAN Hongyi +1 位作者 ZHAO Qiming LIU Yuxiang 《Aerospace China》 2019年第4期31-38,共8页
With the advances of small satellite technology in commercial space sector,using small satellite networks to form a satellite constellation and conduct commercial operational services has entered into a vigorous phase... With the advances of small satellite technology in commercial space sector,using small satellite networks to form a satellite constellation and conduct commercial operational services has entered into a vigorous phase of development.As small satellite technology develops,problems in the operations of small satellite constellations are also gradually emerging.These include ground measurement and operational control systems for small satellite constellations,the commercial operational mode,support and the guarantee of laws and regulations related to small satellites.This report discusses the development of commercial space small satellite operation industrialization,explores the small satellite operational modes and technological innovation,proposes the commercial space industry chain to build the industry ecology.At the same time,it looks forward to the integration of space and terrestrial communication.It also calls on relevant organizations of China to speed up the process of space legislation,formulate the relevant policies to encourage the operations of small satellites in commercial space sector,and push China’s commercial space to a new level. 展开更多
关键词 commercial space small satellite satellite constellation constellation operating trend analysis
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Technology and Market Prospect Analysis of Low Cost Small-lift Launch Vehicles for Small Satellites
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作者 YAO Yanfeng CUI Yinghui +1 位作者 FAN Wei PEI Shengwei 《Aerospace China》 2016年第3期36-43,共8页
The technological development status of new generation low cost small-lift launch vehicles applied to small satellite launch is investigated in this paper. The development trends are summarized, including low cost and... The technological development status of new generation low cost small-lift launch vehicles applied to small satellite launch is investigated in this paper. The development trends are summarized, including low cost and rapid response capability, utilization of mature rocket and missile technology, the development of mobile launch technology adopting air-based platforms and use of innovative technology. Moreover, the external power and internal demand of the small-lift launch vehicle are analyzed and the market prospect is forecasted. Finally, proposals for the development of small-lift launch vehicles are put forward, including exploration of the potential of existing rocket and missile technology, development of multi-platform mobile launch technology and further application of innovative technology and ideas. 展开更多
关键词 small satellite Low cost small-lift launch vehicle Development trends Market prospect
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Bipartite graph-based control flow checking for COTS-based small satellites 被引量:2
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作者 Wang Honghao Wang Huiquan Jin Zhonghe 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2015年第3期883-893,共11页
Abstract Single event upset (SEU) effect, caused by highly energized particles in aerospace, threatens the reliability and security of small satellites composed of commercialofftheshelves (COTS). SEU induced contr... Abstract Single event upset (SEU) effect, caused by highly energized particles in aerospace, threatens the reliability and security of small satellites composed of commercialofftheshelves (COTS). SEU induced control flow errors (CFEs) may cause unpredictable behavior or crashes of COTSbased small satellites. This paper proposes a generic softwarebased control flow checking technique (CFC) and bipartite graphbased control flow checking (BGCFC). To simplify the types of illegal branches, it transforms the conventional control flow graph into the equivalent bipartite graph. It checks the legal ity of control flow at runtime by comparing a global signature with the expected value and introduces consecutive IDs and bitmaps to reduce the time and memory overhead. Theoretical analysis shows that BGCFC can detect all types of internode CFEs with constant time and memory overhead. Practical tests verify the result of theoretical analysis. Compared with previous techniques, BGCFC achieves the highest error detection rate, lower time and memory overhead; the composite result in evaluation fac tor shows that BGCFC is the most effective one among all these techniques. The results in both theory and practice verify the applicability of BGCFC for COTSbased small satellites. 展开更多
关键词 Bipartite graph Control flow checking Commercial-off-the-shelves(COTS) Error injection Fault tolerant Illegal branch small satellites
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Conceptual rotational mode design for optical conical scanning imaging small satellites 被引量:2
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作者 WANG Feng XI RuiChen +2 位作者 YUE ChengFei LI HuaYi CAO XiBin 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2020年第8期1383-1395,共13页
This paper focuses upon the novel optical conical scanning imaging working mode design for small satellites.This kind of satellite employs only one inclined optical camera achieving wide-swath imaging via a rotational... This paper focuses upon the novel optical conical scanning imaging working mode design for small satellites.This kind of satellite employs only one inclined optical camera achieving wide-swath imaging via a rotational motion about the nadir axis either by the camera or by the satellite.Three working modes are designed,i.e.,high-speed rotational mode,low-speed rotational mode,and variable-speed rotational mode.For the high-speed and low-speed working modes,the camera rotates at a constant speed and the corresponding angular velocity is derived under the consideration of guaranteed coverage and minimized overlap.To improve the system performance,an enhanced working mode taking advantages of both the high-speed rotational mode and lowspeed rotational mode is proposed.Working in this variable-speed rotational mode,the camera rotates slowly to get high-quality pictures when it works,while it rotates rapidly to reduce the energy consumption and save the storage during which period the camera is turned off to minimize the overlap.All these working modes are illustrated in detail,and numerical simulation tests are conducted to validate their effectiveness. 展开更多
关键词 remote sensing optical imaging wide-swath imaging conical scanning small satellite
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Minimum-torque Earth Off-nadir Pointing Control of Gravity-gradient Stabilized Small Satellites
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作者 李俊峰 徐敏 +1 位作者 王照林 王士敏 《Tsinghua Science and Technology》 EI CAS 2000年第1期31-33,共3页
Earth off\|nadir pointing technology can be used on a small satellite to provide larger nadir earth surface imaging coverage. In this paper, the satellite attitude dynamics equations including the gravity\|gradient ... Earth off\|nadir pointing technology can be used on a small satellite to provide larger nadir earth surface imaging coverage. In this paper, the satellite attitude dynamics equations including the gravity\|gradient torque and wheel motor torque are derived using Euler parameters. The necessary conditions for optimum solutions subject to the performance index are obtained via Pontryagin's principle. The resulting two\|point boundary value problem is solved numerically with an optimal slew illustrated by example. 展开更多
关键词 attitude dynamics small satellites large angle maneuver gravity gradient optimal control
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Low Profile UHF Antenna Design for Low Earth-Observation CubeSats 被引量:1
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作者 Md.Amanath Ullah Touhidul Alam +1 位作者 Ali F.Almutairi Mohammad Tariqul Islam 《Computers, Materials & Continua》 SCIE EI 2022年第5期2533-2542,共10页
This paper reveals a new design of UHF CubeSat antenna based on a modified Planar Inverted F Antenna(PIFA)for CubeSat communication.The design utilizes a CubeSat face as the ground plane.There is a gap of 5 mm beneath... This paper reveals a new design of UHF CubeSat antenna based on a modified Planar Inverted F Antenna(PIFA)for CubeSat communication.The design utilizes a CubeSat face as the ground plane.There is a gap of 5 mm beneath the radiating element that facilitates the design providing with space for solar panels.The prototype is fabricated using Aluminum metal sheet and measured.The antenna achieved resonance at 419 MHz.Response of the antenna has been investigated after placing a solar panel.Lossy properties of solar panels made the resonance shift about 20 MHz.This design addresses the frequency shifting issue after placing the antenna with the CubeSat body.This phenomenon has been analyzed considering a typical 1U and 2U CubeSat body with the antenna.The antenna achieved a positive realized gain of 0.7 dB and approximately 78%of efficiency at the resonant frequency with providing 85%of open space for solar irradiance onto the solar panel. 展开更多
关键词 CubeSat antenna UHF antenna small satellite satellite communication
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Low Cost and Reusability of Launch Vehicle 被引量:2
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作者 LU Yu QIN Xudong CHEN Haipeng 《Aerospace China》 2016年第2期37-44,共8页
This paper analyzes the launch price of the launch vehicles, domestic and abroad, studies the status and trend of the low cost launch vehicles, and introduces two measures to reduce the cost by means of evolved and di... This paper analyzes the launch price of the launch vehicles, domestic and abroad, studies the status and trend of the low cost launch vehicles, and introduces two measures to reduce the cost by means of evolved and disruptive technologies, utilizing the concept of low cost manufacturing and operating modes as well. This paper also analyzes the launch strategies for small satellites such as piggyback, networking launch, and single launch with a small launch vehicle(SLV). Finally, the development trend of reusable launch vehicles is discussed as well as the development prospects for China's reusable launch vehicle. 展开更多
关键词 Launch vehicle Low cost small satellite Commercial space REUSABLE
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Formation flying orbit design for the distributed synthetic aperture radar satellite
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作者 CHENJie ZHOUYinqing LlChunsheng 《Science in China(Series F)》 2004年第6期741-751,共11页
Formation flying orbit design is one of the key technologies for system design and performance analysis of the distributed SAR satellites. The approximately analytic solution of the passive stable formation flying orb... Formation flying orbit design is one of the key technologies for system design and performance analysis of the distributed SAR satellites. The approximately analytic solution of the passive stable formation flying orbit elements is explored based on the expansion form of Kepler's equation. A new method of orbital parameters design for three-dimensional formation flying SAR satellites is presented, and the precision of the orbital elements is analyzed. Formation flying orbit elements are calculated for the L-Band distributed SAR satellites using the formulas deduced in this paper. The accuracy of the orbital elements is validated by the computer simulation results presented in this paper. 展开更多
关键词 synthetic aperture radar formation flying distributed satellite small satellite.
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First spaceborne demonstration of BeiDou-3 signals for GNSS reflectometry from CYGNSS constellation 被引量:3
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作者 Weiqiang LI Estel CARDELLACH +2 位作者 Serni RIBO Antonio RIUS Bo ZHOU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2021年第9期1-10,共10页
The full constellation of Chinese Global Navigation Satellite System(GNSS)Bei Dou-3 has been deployed completely and started fully operational service.In addition to providing global Positioning,Navigation and Timing(... The full constellation of Chinese Global Navigation Satellite System(GNSS)Bei Dou-3 has been deployed completely and started fully operational service.In addition to providing global Positioning,Navigation and Timing(PNT)services,the Bei Dou-3 satellites transmissions can also be used as the sources of illumination for Earth Observation(EO)with a bistatic radar configuration.This innovative EO concept,known as GNSS reflectometry(GNSS-R),allows to measure the Earth surface characteristics at high resolution via the reflected L-band radar signals collected by a constellation of small,low cost and low Earth orbiting satellites.For the first time in orbit,earth reflected Bei Dou-3 signal has been detected from the limited sets of raw data collected by the NASA’s Cyclone GNSS(CYGNSS)constellation.The feasibility of spaceborne Bei Dou-3 reflections on two typical applications,including sea surface wind and flooding inundation detection,has been demonstrated.The methodology and results give new strength to the prospect of new spaceborne GNSS-R instruments and missions,which can make multi-GNSS reflectometry observations available to better capture rapidly changing weather systems at better spatio-temporal scales. 展开更多
关键词 Global Navigation satellite System(GNSS) BeiDou-3 small satellites Bistatic radar GNSS Reflectometry(GNSS-R) CYGNSS Tropical cyclone Flood inundation
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An approach to extracting information of residential areas from Beijing-1 image based on Gabor texture segmentation
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作者 J.Gong X.Yang +2 位作者 F.Su Y.Du D.Zhang 《International Journal of Digital Earth》 SCIE 2009年第2期186-193,共8页
According to the features of high-resolution panchromatic imagery of Beijing-1 small satellite,an approach to extracting information of residential areas is proposed in this paper based on Gabor texture segmentation.T... According to the features of high-resolution panchromatic imagery of Beijing-1 small satellite,an approach to extracting information of residential areas is proposed in this paper based on Gabor texture segmentation.The algorithm extracts the features in different directions and different scales by building the Gabor filter,uses cluster analysis of multiple features to segment the image,and performs the fusion processing based on morphological scale space.It solves the problems in image processing resulting from low contrast between remote sensing objects and background,the blurring of image edges and high noise.It has the benefits of direction selection and frequency selection with strong self-adaptive ability.Our experiments prove the effectiveness of the approach for extracting information of residential areas from Beijing-1 high-resolution imagery. 展开更多
关键词 Gabor filter texture segmentation Beijing-1 small satellite image processing
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