Results 31 to 40 of about 2,490,935 (346)

Self-organising satellite constellation in geostationary Earth orbit [PDF]

, 2015
This paper presents a novel solution to the problem of autonomous task allocation for a self-organizing satellite constellation in Earth orbit. The method allows satellites to cluster themselves above targets on the Earth’s surface.
Colombo, Camilla, Mingotti, Giorgio, McInnes, Colin, Mushet, Garrie   +3 more
core   +1 more source

Combining laparoscopy and satellite tracking: Successful round-trip tracking of female green turtles from feeding areas to nesting grounds and back

, 2020
Adult sea turtles undertake periodic long-distance migrations between foraging and nesting areas during breeding migrations, and an understanding the connectivity between these two important habitats can contribute to efficient conservation planning.
N. Pilcher, C. Rodríguez-Zárate, M. Antonopoulou, D. Mateos-Molina, H. Das, Ibrahim Bugla   +5 more
semanticscholar   +1 more source

Filling knowledge gaps in a threatened shorebird flyway through satellite tracking

Journal of Applied Ecology, 2019
1. Satellite‐based technologies that track individual animal movements enable the mapping of their spatial and temporal patterns of occurrence. This is particularly useful in poorly studied or remote regions where there is a need for the rapid gathering ...
Ying‐Chi Chan, T. Tibbitts, Tamar Lok, C. Hassell, He‐Bo Peng, Zhijun Ma, Zhengwang Zhang, T. Piersma   +7 more
semanticscholar   +1 more source

Channel Phase Calibration for High-Resolution and Wide-Swath SAR Imaging with Doppler Spectrum Sharpness Optimization

Sensors, 2022
Channel phase calibration is a crucial issue in high resolution and wide swath (HRWS) imagery with azimuth multi-channel synthetic aperture radar (SAR) systems.
Man Zhang, Sha Huan, Zeya Zhao, Zhibin Wang   +3 more
doaj   +1 more source

Preliminary Study on Double Enhanced Raman Scattering Detection of Gas Phase Trace Explosives

IEEE Access, 2020
The demand of continuous detection technology for gas phase trace explosives (GPTE) in explosion-proof stability maintenance, public security, explosive security storage and other occasions is summarized.
Zhibin Chen, Mengze Qin, Cheng Xiao
doaj   +1 more source

A new low profile antenna with improved performance for satellite on-the-move communications [PDF]

, 2009
A novel design solution for a low-profile fullduplex Satellite-On-The-Move Communications hybrid scanned phased array antenna for low elevation angle coverage (down to 10°) is described. The antenna is operated at Ku-Band.
Yuanyuan Jiang, Alistair Sambell, Foti, Steve, Smith, Dave, Stephen J Foti, Sambell, Alistair, Jiang, Yuanyuan, David Smith   +7 more
core   +1 more source

Trajectory tracking control of failure satellite with actuator jumping fault

Xibei Gongye Daxue Xuebao, 2022
This paper studied the trajectory tracking control of a failure satellite that has actuator jumping fault. It proposed a design method based on the jumping control input for the model reference tracking controller.
LU Yang, CAI Bin, QIAO Daopeng, FU Yanming, ZHANG Maorui   +4 more
doaj   +1 more source

Relative Navigation to Non-Cooperative Targets in LEO: Achievable Accuracy from Radar Tracking Measurements

, 2013
Any future space debris removal or on-orbit servicing mission faces the problem of the initial relative orbit determination of the servicing satellite to the non-cooperative target.
Letsch, Klemens, Spiridonova, Sofya, Weigel, Martin, Kirschner, Michael, Kahr, Erin, Kahle, Ralph   +5 more
core   +1 more source

Filtering module on satellite tracking

AIP Conference Proceedings, 2019
Satellite dynamics and tracking remain important challenges in the context of space exploration and communication systems. Accurate state estimation is essential to maintain reliable orbital motion and system performance. This paper presents a mathematical framework for satellite state estimation based on a linearized model described by radial and ...
openaire   +2 more sources

Architecture design of BeiDou global navigation signals

Geo-spatial Information Science
Navigation signals play a crucial role in determining the performance and user experience of Global Navigation Satellite System (GNSS). In recent years, GNSSs have been actively modernizing their signal architectures to meet the increasing demand for ...
Shuren Guo, Chengeng Su, Feiren Lv
doaj   +1 more source