Results 61 to 70 of about 323 (141)

Enhanced Conjunction Assessment in LEO: A Hybrid Monte Carlo and Spline-Based Method Using TLE Data

Aerospace
The growing density of space objects in low Earth orbit (LEO), driven by the deployment of large satellite constellations, has elevated the risk of orbital collisions and the need for high-precision conjunction analysis.
Shafeeq Koheal Tealib, Ahmed Magdy Abdelaziz, Igor E. Molotov, Xu Yang, Jian Sun, Jing Liu   +5 more
doaj   +1 more source

Optimization of a Walker Constellation Using an RBF Surrogate Model for Space Target Awareness

Aerospace
Designing Low Earth Orbit (LEO) constellations for the continuous, collaborative observation of space objects in MEO/GEO is a complex optimization task, frequently limited by prohibitive computational costs.
You Fu, Zhaojing Xu, Youchen Fan, Liu Yi, Zhao Ma, Yuhai Li, Shengliang Fang   +6 more
doaj   +1 more source

A new approach to modelling space weather impact on the aerodynamic drag of LEO objects

Journal of Space Weather and Space Climate
The ability of space-based infrastructure to provide essential and sustained benefits to humanity in critical areas such as communications, Earth observation, technology development, navigation, and space exploration is increasingly threatened by the ...
Nwankwo Victor U.J., Berdermann Jens, Borries Claudia, Heymann Frank, Kodikara Naveen Timothy, Fernandez-Gomez Isabel, Hoque Mohammed M.   +6 more
doaj   +1 more source

Light-Curve Classification of Resident Space Objects for Space Situational Awareness: A Scoping Review

Aerospace
The proliferation of Resident Space Objects (RSOs), including satellites, rocket bodies, and debris, poses escalating challenges for Space Situational Awareness (SSA). Optical light curves capture temporal brightness variations influenced by factors such
Minyoung Hwang, Vithurshan Suthakar, Randa Qashoa, Regina S. K. Lee, Gunho Sohn   +4 more
doaj   +1 more source

Telescopic Network of Zhulong for Orbit Determination and Prediction of Space Objects

Remote Sensing
The increasing proliferation of space debris, intermittent space incidents, and the rapid emergence of massive LEO satellite constellations pose significant threats to satellites in orbit.
Xiangxu Lei, Zhendi Lao, Lei Liu, Junyu Chen, Luyuan Wang, Shuai Jiang, Min Li   +6 more
doaj   +1 more source

A Space Infrared Dim Target Recognition Algorithm Based on Improved DS Theory and Multi-Dimensional Feature Decision Level Fusion Ensemble Classifier

Remote Sensing
Space infrared dim target recognition is an important applications of space situational awareness (SSA). Due to the weak observability and lack of geometric texture of the target, it may be unreliable to rely only on grayscale features for recognition ...
Xin Chen, Hao Zhang, Shenghao Zhang, Jiapeng Feng, Hui Xia, Peng Rao, Jianliang Ai   +6 more
doaj   +1 more source

Space Situational Awareness in Very Low Earth Orbit for Re-Entry Object Monitoring

Aerospace
As the number of objects in orbit increases every year, the number of objects re-entering Earth’s atmosphere grows as well. Re-entry path prediction is tricky, as atmospheric modeling lacks accuracy and requires constant monitoring of the object during ...
Ruth Huang, Regina S. K. Lee, Marianna Veltri, Vithurshan Suthakar, Angel Porras-Hermoso   +4 more
doaj   +1 more source

Sidelobe Suppression for High-Resolution Terahertz ISAR Imaging of Space Targets Based on ADMM

IEEE Journal of Microwaves
Terahertz (THz) inverse synthetic aperture radar (ISAR) demonstrates unique advantages in space target imaging, enabling submillimeter-level high-resolution imaging and providing crucial technical support for all-weather space situational awareness (SSA).
Liuxiao Yang, Hongqiang Wang, Yang Zeng, Wei Liu, Zhian Yuan, Bin Deng   +5 more
doaj   +1 more source

A novel network security situation assessment model based on multiple strategies whale optimization algorithm and bidirectional GRU. [PDF]

PeerJ Comput Sci, 2023
Zhang S, Fu Q, An D, He Z, Liu Z.
europepmc   +1 more source

Self-Consciousness and Self-Awareness: Associations between Stable and Transitory Levels of Evidence. [PDF]

Behav Sci (Basel), 2023
Majolo M, Gomes WB, DeCastro TG.
europepmc   +1 more source