Results 31 to 40 of about 3,365,879 (300)

A Parallel Approach for Multi-GNSS Ultra-Rapid Orbit Determination

Remote Sensing, 2021
Global Navigation Satellite System (GNSS) ultra-rapid orbit is critical for geoscience and real-time engineering applications. To improve the computational efficiency and the accuracy of predicted orbit, a parallel approach for multi-GNSS ultra-rapid ...
Chunhua Jiang, Tianhe Xu, Wenfeng Nie, Zhenlong Fang, Shuaimin Wang, Aigong Xu   +5 more
doaj   +1 more source

Interferometric Orbit Determination System for Geosynchronous SAR Missions: Experimental Proof of Concept

Remote Sensing, 2022
Future Geosynchronous Synthetic Aperture Radar (GEOSAR) missions will provide permanent monitoring of continental areas of the planet with revisit times of less than 24 h.
Jorge Nicolás-Álvarez, Xavier Carreño-Megias, Estel Ferrer, Miquel Albert-Galí, Judith Rodríguez-Tersa, Albert Aguasca, Antoni Broquetas   +6 more
doaj   +1 more source

Integrated Navigation and Communication Service for LEO Satellites Based on BDS-3 Global Short Message Communication

IEEE Access, 2023
Massive global Low Earth Orbit (LEO) constellations have been developed rapidly with the characteristics of larger number and shorter orbital periods of LEO satellites in recent years.
Shuren Guo, Gang Li, Jiaju Zheng, Qianyi Ren, Yifan Wu, Guanhao Shen, Hengyi Yue   +6 more
doaj   +1 more source

Orbit Determination Using Angle-Only Data for MEO & GEO Satellite and Obsolete [PDF]

Journal of Astronomy and Space Sciences, 2009
We used an optical observation system with a 0.6m wide-field telescope and 5 computers system in KASI (Korean Astronomy and Space Science Institute) for satellite optical observation.
Jin Choi, Bang-Yeop Kim, Hong-Suh Yim, Heon-Young Chang, Joh-Na Yoon, Myung-Jing Kim, Ok-Jun Hwang   +6 more
doaj   +1 more source

Sensitivity of the Gravity Model and Orbital Frame for On-board Real-Time Orbit Determination: Operational Results of GPS-12 GPS Receiver

Remote Sensing, 2019
This paper describes the sensitivity of both the orbital frame domain selection and the gravity model on the performance of on-board real-time orbit determination.
Eunhyouek Kim, Seungyeop Han, Amer Mohammad Al Sayegh   +2 more
doaj   +1 more source

Effect of lunar gravity models on Chang'E-2 orbit determination using VLBI tracking data

Geodesy and Geodynamics, 2016
The precise orbit determination of Chang'E-2 is the most important issue for successful mission and scientific applications, while the lunar gravity field model with big uncertainties has large effect on Chang'E-2 orbit determination.
Erhu Wei, Xuechuan Li, Shuanggen Jin, Jingnan Liu   +3 more
doaj   +1 more source

Orbit Determination for Impulsively Maneuvering Spacecraft Using Modified State Transition Tensor

Journal of Guidance Control and Dynamics
This paper proposes a method to accurately resolve orbit determination for a spacecraft with unknown impulsive maneuvers. The proposed method handles the unknown impulsive maneuver by incorporating the magnitude, direction, and time of the impulsive ...
Xing-Yu Zhou, Dong Qiao, Malcolm Macdonald   +2 more
semanticscholar   +1 more source

Correction Method for the Observed Global Navigation Satellite System Ultra-Rapid Orbit Based on Dilution of Precision Values

Sensors, 2018
For ultra-rapid orbits provided by the Global Navigation Satellite System (GNSS), the key parameters, accuracy and timeliness, must be taken into consideration in real-time and near real-time applications.
Qianxin Wang, Chao Hu, Ya Mao
doaj   +1 more source

Asteroid impact monitoring [PDF]

Serbian Astronomical Journal, 2006
Some asteroids and comets with Earth-crossing orbit may impact our planet, thus we need to be able to identify the cases which could have a dangerous close approach within a century.
Milani A.
doaj   +1 more source

Research on the Rotational Correction of Distributed Autonomous Orbit Determination in the Satellite Navigation Constellation

Remote Sensing, 2022
The autonomous orbit determination of the navigation constellation uses only bidirectional ranging data of the inter-satellite link for data processing.
Wei Zhou, Hongliang Cai, Ziqiang Li, Chengpan Tang, Xiaogong Hu, Wanke Liu   +5 more
doaj   +1 more source