scholarly journals An Improved Augmented Algorithm for Direction Error in XPNAV

Symmetry ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1059
Author(s):  
Xiaobin Ren ◽  
Guigen Nie ◽  
Lianyan Li
Keyword(s):  
Space Exploration ◽  
State Equation ◽  
Measurement Equation ◽  
X Ray ◽  
Direction Error ◽  
Deep Space Exploration ◽  
Augmented State ◽  
Navigation Method ◽  
Accuracy And Stability ◽  
Novel Algorithm

Recently, X-ray pulsar-based navigation (XPNAV) as a significant navigation method has been widely used in deep space exploration. However, the accuracy of XPNAV is limited to the existence of the pulsar direction error. To improve the performance of XPNAV, we have proposed a novel algorithm named “the modified augmented state extended Kalman filter” (MASEKF). The algorithm considers the high-order terms of direction error and then adds a more precise direction error into state equation and measurement equation. In the simulation, by comparing the performance of MASEKF, EKF, and ASEKF at the same time, it is found that MASEKF has better performance in the accuracy and stability, and the results also demonstrate that MASEKF algorithm has faster convergence speed. This paper provides a strong reference for other improvements of algorithms towards direction error. The purpose of this study is to establish MASEKF and add the direction error into the measurement equation and the state equation, so as to realize the coordination and symmetry of the algorithm.

X-ray pulsar navigation method for spacecraft with pulsar direction error

2010 ◽  
Vol 46 (11) ◽  
pp. 1409-1417 ◽  
Author(s):  
Jing Liu ◽  
Jie Ma ◽  
Jin-wen Tian ◽  
Zhi-wei Kang ◽  
Paul White
Keyword(s):  
X Ray ◽  
Direction Error ◽  
Navigation Method ◽  
Pulsar Navigation

X-ray pulsar/Doppler difference integrated navigation for deep space exploration with unstable solar spectrum

2015 ◽  
Vol 41 ◽  
pp. 144-150 ◽  
Author(s):  
Jin Liu ◽  
Jian-cheng Fang ◽  
Zhao-hua Yang ◽  
Zhi-wei Kang ◽  
Jin Wu
Keyword(s):  
Space Exploration ◽  
Solar Spectrum ◽  
Integrated Navigation ◽  
Deep Space ◽  
X Ray ◽  
Deep Space Exploration

scholarly journals Overview of Intelligent Power Controller Development for Human Deep Space Exploration

2014 ◽  
Author(s):  
James F. Soeder ◽  
Anne Mcnelis ◽  
Raymond Beach ◽  
Nancy McNelis ◽  
Timothy Dever ◽  
...  
Keyword(s):  
Space Exploration ◽  
Deep Space ◽  
Power Controller ◽  
Deep Space Exploration

scholarly journals An advance in transfer line chilldown heat transfer of cryogenic propellants in microgravity using microfilm coating for enabling deep space exploration

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
J. N. Chung ◽  
Jun Dong ◽  
Hao Wang ◽  
S. R. Darr ◽  
J. W. Hartwig
Keyword(s):  
Space Exploration ◽  
Fluid Management ◽  
Microgravity Condition ◽  
Space Mission ◽  
Low Earth Orbit ◽  
Earth Orbit ◽  
Deep Space ◽  
Deep Space Exploration ◽  
Quenching Efficiency ◽  
Proper Perspective

AbstractThe extension of human space exploration from a low earth orbit to a high earth orbit, then to Moon, Mars, and possibly asteroids is NASA’s biggest challenge for the new millennium. Integral to this mission is the effective, sufficient, and reliable supply of cryogenic propellant fluids. Therefore, highly energy-efficient thermal-fluid management breakthrough concepts to conserve and minimize the cryogen consumption have become the focus of research and development, especially for the deep space mission to mars. Here we introduce such a concept and demonstrate its feasibility in parabolic flights under a simulated space microgravity condition. We show that by coating the inner surface of a cryogenic propellant transfer pipe with low-thermal conductivity microfilms, the quenching efficiency can be increased up to 176% over that of the traditional bare-surface pipe for the thermal management process of chilling down the transfer pipe. To put this into proper perspective, the much higher efficiency translates into a 65% savings in propellant consumption.

scholarly journals Zero gravity induced by parabolic flight enhances automatic capture and weakens voluntary maintenance of visuospatial attention

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Adriana Salatino ◽  
Claudio Iacono ◽  
Roberto Gammeri ◽  
Stefano T. Chiadò ◽  
Julien Lambert ◽  
...  
Keyword(s):  
Space Exploration ◽  
Parabolic Flight ◽  
Vestibular Function ◽  
Visuospatial Attention ◽  
Covert Attention ◽  
Zero Gravity ◽  
Deep Space ◽  
Otolith Organ ◽  
Deep Space Exploration ◽  
Automatic Capture

AbstractOrienting attention in the space around us is a fundamental prerequisite for willed actions. On Earth, at 1 g, orienting attention requires the integration of vestibular signals and vision, although the specific vestibular contribution to voluntary and automatic components of visuospatial attention remains largely unknown. Here, we show that unweighting of the otolith organ in zero gravity during parabolic flight, selectively enhances stimulus-driven capture of automatic visuospatial attention, while weakening voluntary maintenance of covert attention. These findings, besides advancing our comprehension of the basic influence of the vestibular function on voluntary and automatic components of visuospatial attention, may have operational implications for the identification of effective countermeasures to be applied in forthcoming human deep space exploration and habitation, and on Earth, for patients’ rehabilitation.

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