Results 11 to 20 of about 1,734,402 (280)

Towards robust aero-thermodynamic predictions for re-usable single-stage to orbit vehicles [PDF]

, 2012
Re-usable single stage to orbit launch vehicles promise to reduce the cost of access to space, but their success will be particularly reliant on accurate and robust modelling of their aero-thermodynamic characteristics.
Wuilbercq, Romain, Scanlon, Thomas, Ahmad, Abdul Ossman, Brown, Richard   +3 more
core   +4 more sources

Extension of the sun-synchronous Orbit [PDF]

, 2010
Through careful consideration of the orbit perturbation force due to the oblate nature of the primary body a secular variation of the ascending node angle of a near-polar orbit can be induced without expulsion of propellant.
Bosquillon de Frescheville, Francois, Vasile, M., Robert McKay, de Frescheville, F.B., François Bosquillon de Frescheville, McKay, R., Malcolm Macdonald, Macdonald, M., McKay, R.J., Massimiliano Vasile   +9 more
core   +4 more sources

Orbit Prediction Methods for ONEWEB Constellation

Aerospace
This study aims to enhance Low Earth Orbit (LEO) satellite orbit prediction accuracy. We propose the Precise Orbit Determination with Optimized Perturbations (PODOP) method, considering Earth’s non-spherical gravity, atmospheric drag, etc., and a Long ...
Junyu Chen, Zhangyi Wen, Kaihui Hu, Xiangxu Lei   +3 more
doaj   +2 more sources

Orbit Determination for All-Electric GEO Satellites Based on Space-Borne GNSS Measurements

Remote Sensing, 2022
Orbit accuracy of the transfer orbit and the mission orbit is the basis for the orbit control of all-electric-propulsion Geostationary Orbit (GEO) satellites.
Wenqiang Lu, Haoguang Wang, Guoqiang Wu, Yong Huang   +3 more
doaj   +1 more source

Bulk plasma properties at geosynchronous orbit. [PDF]

, 2005
We present a comprehensive study of plasma properties at geosynchronous orbit for electron and ion energies between ∼1 eV and ∼45 keV, between 1990 and 2001.
Liemohn, M. W., Zhang, J. C., Denton, Michael H., Korth, H., Thomsen, M. F., Lynch, S.   +5 more
core   +5 more sources

Prediction Aerospace Software to Detect Solar Activity and the Fast Tracking of Solar Activity Using Remote Sensing Instruments in Orbit

Remote Sensing, 2023
At present, solar remote sensing instruments face problems regarding the short detection time for solar activity and the need to preheat the electronics before detection.
Yingqiu Shao, Xiaohu Yang, Zhanfeng Li, Yu Huang, Bo Li, Guanyu Lin, Xu Guo, Jifeng Li   +7 more
doaj   +1 more source

Estimation of a General Along-Track Acceleration in the KOMPSAT-1 Orbit [PDF]

Journal of Astronomy and Space Sciences, 2002
General along-track acceleration was estimated in the KOMPSAT-1 orbit determination process. Several sets of the atmospheric drag and solar radiation pressure coefficients were also derived with the different spacecraft area.
Byoung-Sun Lee, Jeong-Sook Lee, Jae-Hoon Kim   +2 more
doaj   +1 more source

Detection and Tracking of Weak Exoatmospheric Target with Elliptical Hough Transform

Remote Sensing, 2022
An elliptical Hough transform (EHT) algorithm is proposed in the framework of track-before-detect (TBD) for joint detection and tracking of weak exoatmospheric targets.
Bin Rao, Yongkun Zhou, Yuanping Nie
doaj   +1 more source

Electrochromic orbit control for smart-dust devices [PDF]

, 2012
Recent advances in MEMS (micro electromechanical systems) technology are leading to spacecraft which are the shape and size of computer chips, so-called SpaceChips, or ‘smart dust devices’.
Colombo, Camilla, McInnes, Colin, Lucking, Charlotte, McInnes, Colin R.   +3 more
core   +4 more sources

Ballistic Coefficient Calculation Based on Optical Angle Measurements of Space Debris

Sensors, 2023
Atmospheric drag is an important factor affecting orbit determination and prediction of low-orbit space debris. To obtain accurate ballistic coefficients of space debris, we propose a calculation method based on measured optical angles.
Yigao Ding, Zhenwei Li, Chengzhi Liu, Zhe Kang, Mingguo Sun, Jiannan Sun, Long Chen   +6 more
doaj   +1 more source