Results 11 to 20 of about 1,844,811 (291)

Impacts of Arc Length and ECOM Solar Radiation Pressure Models on BDS-3 Orbit Prediction

Remote Sensing, 2022
The BeiDou global navigation satellite system (BDS-3) has already provided worldwide navigation and positioning services for which the high-precision BDS-3-predicting orbit is the foundation.
Ran Li, Chunmei Zhao, Jiatong Wu, Hongyang Ma, Yang Zhang, Guang Yang, Hong Yuan, Hongyu Zhao   +7 more
doaj   +2 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 Short-Term Memory (LSTM)-based approach for orbital element time series. Validation shows that PODOP’s
Junyu Chen, Zhangyi Wen, Kaihui Hu, Xiangxu Lei   +3 more
openaire   +2 more sources

Expandable Orbit Decay Prediction Using Continual Learning

International Journal of Aerospace Engineering
Very low earth orbit (VLEO) spacecraft have become an attractive proposition with obvious advantages in various missions, including communication and ground observation.
Junhua He, Hua Wang, Haitao Wang, Xuankun Fang, Chengyi Huo   +4 more
doaj   +2 more sources

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., Macdonald, M., McKay, R.J.   +3 more
core   +3 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

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

Prediction of tissue decompression in orbital surgery [PDF]

Clinical Biomechanics, 2004
Objective: A method to predict the relationships between decompressed volume of orbital soft tissues, backward displacement of globe after osteotomy, and force exerted by the surgeon, was proposed to improve surgery planning in exophthalmia reduction.
Luboz, Vincent, Pedrono, Annaig, Ambard, Dominique, Boutault, Franck, Payan, Yohan, Swider, Pascal   +5 more
openaire   +3 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

On the predictability of Galileo disposal orbits [PDF]

, 2019
29 pages, 20 ...
Gondelach, David J., Armellin, Roberto, Wittig, Alexander   +2 more
openaire   +3 more sources