Results 21 to 30 of about 383,072 (432)
Multi-function array SAR system on a spaceborne dual platform
The Journal of Engineering, 2019 This study proposes a sparse linear array synthetic aperture radar (LASAR) on a spaceborne dual platform. The transmitting elements are placed at the LASAR tips that form a satellite's dual platform, and the receiving elements are placed on the large ...
Dehua He +4 more
doaj +1 more source
Space: Science & Technology, 2023 China’s Tiangong space station has been completed in 2022 to support large-scale multidisciplinary space science research and technology experiments. With a large payload capacity and long operating time, Tiangong space station has many irreplaceable ...
Zhao Yin +5 more
doaj +1 more source
Azimuthal repositioning of payloads in heliocentric orbit using solar sails [PDF]
, 2003 FUTURE solar physics missions will require the ability to reposition multiple spacecraft at different azimuthal positions relative to the Earth, while remaining close to a one year circular orbit.
McInnes, Colin R.
core +1 more source
XMM-Newton observatory. I. The spacecraft and operations
, 2001 The XMM-Newton Observatory is a cornerstone mission of the European Space Agency's Horizon 2000 programme, and is the largest scientific satellite it has launched to date.
F. Jansen +14 more
semanticscholar +1 more source
Pose estimation for non-cooperative spacecraft rendezvous using convolutional neural networks [PDF]
IEEE Aerospace Conference, 2018 On-board estimation of the pose of an uncooperative target spacecraft is an essential task for future on-orbit servicing and close-proximity formation flying missions.
Sumant Sharma, C. Beierle, S. D’Amico
semanticscholar +1 more source
Sparse control for continuous‐time systems
International Journal of Robust and Nonlinear Control, Volume 33, Issue 1, Page 6-22, 10 January 2023., 2023 Abstract In this survey article, we give a comprehensive review of sparse control for continuous‐time systems, called maximum hands‐off control. The maximum hands‐off control is the optimal control, for which we introduce fundamental properties such as necessary conditions, existence, and equivalence to the optimal control.
Masaaki Nagahara
wiley +1 more source
The Journal of Engineering, 2019 A large aperture membrane phased array antenna with an array antenna and transmit/receive (T/R) modules is presented for geosynchronous Earth orbit synthetic aperture radar applications.
Mingming Xu +5 more
doaj +1 more source
Thermal Characteristic of Novel Insulation Materials Designed for Solar Simulator
Energies, 2022 The solar simulator is an important device for simulating solar irradiation in cold black and vacuum environments and has a wide range of application prospects.
Wenjing Ding +4 more
doaj +1 more source
International Journal of Satellite Communications and Networking, Volume 41, Issue 1, Page 82-97, January/February 2023., 2023 This paper analyzes which constellation characteristics provide the best global coverage at the lowest operational cost. Our analysis has found that geostationary and medium Earth orbit satellite constellations have the highest likelihood of profitability. LEO networks are more expensive, but if designed wisely, they can be competitive.
Inigo del Portillo +3 more
wiley +1 more source
A Prosaic Explanation for the Anomalous Accelerations Seen in Distant Spacecraft [PDF]
Phys.Rev.Lett. 83 (1999) 1890, 1998 Anderson, et al. (gr-qc/9808081) have recently reported the discovery of an apparent anomalous, weak, long-range acceleration in the Pioneer 10/11 and Ulysses spacecraft. I believe that this result can be explained by non-isotropic radiative cooling of the spacecraft electronics through passive radiators on the spacecraft surface.
arxiv +1 more source