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Bipartite graph-based control flow checking for COTS-based small satellites

Chinese Journal of Aeronautics 2015年第3期28卷 883-893页

作者： Wang Honghao Wang Huiquan Jin Zhonghe Micro-satellite Research Center Zhejiang University

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.

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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Minimum-torque Earth Off-nadir Pointing Control of Gravity-gradient Stabilized small satellites

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Tsinghua Science and Technology 2000年第1期5卷 31-33页

作者：李俊峰徐敏王照林王士敏 Department of Engineering Mechanics Tsinghua University Beijing 100084 China

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. 

关键词： attitude dynamics small satellites large angle maneuver gravity gradient optimal control

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First spaceborne demonstration of BeiDou-3 signals for GNSS reflectometry from CYGNSS constellation

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Chinese Journal of Aeronautics 2021年第9期34卷 1-10页

作者： Weiqiang LI Estel CARDELLACH Serni RIBO Antonio RIUS Bo ZHOU Institute of Space Sciences(ICE CSIC)Barcelona 08193Spain Institut d'Estudis Espacials de Catalunya(IEEC) Barcelona 08034Spain Shanghai Spaceflight Institute of TT&C and Telecommunications Shanghai 201109China

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.

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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