Results 11 to 20 of about 2,340 (256)

Optimal Walker Constellation Design of LEO-Based Global Navigation and Augmentation System

Remote Sensing, 2020
Low Earth orbit (LEO) satellites located at altitudes of 500 km~1500 km can carry much stronger signals and move faster than medium Earth orbit (MEO) satellites at about a 20,000 km altitude.
Meiqian Guan, Tianhe Xu, Fan Gao, Wenfeng Nie, Honglei Yang   +4 more
doaj   +3 more sources

Multi-LEO Satellite Stereo Winds

Remote Sensing, 2023
The stereo-winds method follows trackable atmospheric cloud features from multiple viewing perspectives over multiple times, generally involving multiple satellite platforms. Multi-temporal observations provide information about the wind velocity and the observed parallax between viewing perspectives provides information about the height.
James L. Carr, Dong L. Wu, Mariel D. Friberg, Tyler C. Summers   +3 more
openaire   +2 more sources

A Method for Measuring Gravitational Potential of Satellite’s Orbit Using Frequency Signal Transfer Technique between Satellites

Remote Sensing, 2023
We introduce an approach for the direct measurement of the gravitational potential (GP) along the trajectory of a satellite, with a specific focus on Low-Earth Orbit (LEO) satellites.
Ziyu Shen, Wenbin Shen, Xinyu Xu, Shuangxi Zhang, Tengxu Zhang, Lin He, Zhan Cai, Si Xiong, Lingxuan Wang   +8 more
doaj   +1 more source

LEO satellites: "photobombing astronomy images"

, 2023
Scientific poster that highlights the problem with low earth orbit (LEO) satellites and their photometric reflective properties.
Longa-Peña, P., Hinse, T. C., Tregloan-Reed, J., Unda-Sanzana, E.   +3 more
openaire   +4 more sources

BeiDou Augmented Navigation from Low Earth Orbit Satellites

Sensors, 2019
Currently, the Global Navigation Satellite System (GNSS) mainly uses the satellites in Medium Earth Orbit (MEO) to provide position, navigation, and timing (PNT) service.
Mudan Su, Xing Su, Qile Zhao, Jingnan Liu   +3 more
doaj   +1 more source

LEO ISL-Assisted BDS-3 and LEO Rapid Joint Precise Orbit Determination

Remote Sensing
BDS-3 faces challenges in achieving precision orbit determination (POD) due to the difficulty of establishing a globally uniform distribution of independently operated ground tracking stations. The use of onboard BDS-3 observations collected by low Earth
Le Wang, Dandan Song, Wen Lai, Bobin Cui, Guanwen Huang   +4 more
doaj   +1 more source

Optimization Design of Routing Algorithm Based on GEO/LEO Double-Layer Satellite Network [PDF]

Jisuanji gongcheng, 2020
Satellite network topology is temporally variant,causing frequent link interruption and end to end long delay between satellites.To address the problem,this paper constructs a double-layer network architecture for satellites on Geosynchronous Earth Orbit(
ZHANG Taijiang, LI Yongjun, ZHAO Shanghong
doaj   +1 more source

Initial Design for Next-Generation BeiDou Integrity Subsystem: Space–Ground Integrated Integrity Monitoring

Remote Sensing
It is essential to provide high-integrity navigation information for safety-critical applications. Global navigation satellite systems (GNSSs) play an important role in these applications because they can provide global, high-accuracy, all-weather ...
Weiguang Gao, Lei Chen, Feiren Lv, Xingqun Zhan, Lin Chen, Yuqi Liu, Yongshan Dai, Yundi Jin   +7 more
doaj   +1 more source

Autonomous Mission Planning Method for Optical Imaging Satellites Based on Real-Time Cloud Cover Information

Remote Sensing, 2022
Cloud cover is an important factor limiting the earth observation efficiency of optical imaging satellites. Existing solutions include avoiding cloudy observation time windows by onboard cloud detectors and ground monitors, which are difficult to improve
Zhiliang Li, Limin Zhao, Yun Liu, Xingfeng Chen, Hang Chen, Fengjie Zheng, Yunli Zhang, Donghong Wang, Jiaguo Li, Jun Liu, Shumin Liu   +10 more
doaj   +1 more source

Instantaneous velocity determination and positioning using Doppler shift from a LEO constellation

Satellite Navigation, 2023
To provide backup and supplementation for the Global Navigation Satellite System (GNSS), Doppler shift from Low Earth Orbit (LEO) satellites can be used as signals of opportunity to provide positioning, navigation, and timing service.
Fei Guo, Yan Yang, Fujian Ma, Yifan Zhu, Hang Liu, Xiaohong Zhang   +5 more
doaj   +1 more source