Results 11 to 20 of about 2,243 (114)

Design of Space Target Surveillance Constellation Based on Simulation Comparison Method

Sensors
Aiming at the requirement of space situational awareness on the full-domain and all-time coverage capability of low Earth orbit space targets and focusing on the design of a space-based space target awareness system, a space target awareness ...
Qinying Hu, Desheng Liu, Ziwei Dong
doaj   +3 more sources

Effect of Observation Geometry on Short-Arc Angles-Only Initial Orbit Determination

Applied Sciences, 2022
Space-based optical sensors are attracting increasing research attention as they can measure the angle of space targets over large areas, facilitating low-cost, wide-area space target surveillance. Studying the effect of observation geometry on short-arc
Zhao Feng, Changxiang Yan, Yanfeng Qiao, Anlin Xu, Haihong Wang   +4 more
doaj   +1 more source

Nonuniform Background Correction for Wide-Field Surveillance Camera

Applied Sciences, 2023
Space environment surveillance is very important for space security, which is easy to be disturbed by stray light and hot pixels, and the image background presents a certain degree of nonuniformity.
Dali Zhou, Xiaodong Wang
doaj   +1 more source

Conceptual Design of the NISS onboard NEXTSat-1 [PDF]

Journal of Astronomy and Space Sciences, 2014
The NISS onboard NEXTSat-1 is being developed by Korea astronomy and space science institute (KASI). For the study of the cosmic star formation history, the NISS performs the imaging spectroscopic observation in the near-infrared range for nearby ...
Woong-Seob Jeong, Sung-Joon Park, Kwijong Park, Dae-Hee Lee, Jeonghyun Pyo, Bongkon Moon, Youngsik Park, Il-Joong Kim, Won-Kee Park, Duk-Hang Lee, Chan Park, Kyeongyeon Ko, Toshio Matsumoto, Norihide Takeyama, Akito Enokuchi, Goo-Whan Shin, Jangsoo Chae, Uk-Won Nam   +17 more
doaj   +1 more source

Capability of a Ground-Based Passive Surveillance System to Detect and Track Spaceborne SAR in LEO Orbits

Remote Sensing, 2022
Monitoring the Earth’s surface from the low Earth orbit (LEO) by synthetic aperture radar (SAR) provides meaningful information about a number of human activities such as the ecosystem, agriculture, and of course security matters. During its operation in
David Novák, Ladislav Gregor, Jiří Veselý   +2 more
doaj   +1 more source

A Novel Deep Learning-Based Relabeling Architecture for Space Objects Detection from Partially Annotated Astronomical Images

Aerospace, 2022
Space Surveillance and Tracking is a task that requires the development of systems that can accurately discriminate between natural and man-made objects that orbit around Earth.
Florin Dumitrescu, Bogdan Ceachi, Ciprian-Octavian Truică, Mihai Trăscău, Adina Magda Florea   +4 more
doaj   +1 more source

SST Anywhere—A Portable Solution for Wide Field Low Earth Orbit Surveillance

Remote Sensing, 2022
The low-Earth orbit (LEO) is filled with active satellites, but also with space debris, which need constant observation. The orbiting objects may be affected by collisions or by atmospheric drag, and therefore they can change their orbit or even fall to ...
Radu Gabriel Danescu, Razvan Itu, Mircea Paul Muresan, Ana Rednic, Vlad Turcu   +4 more
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Establishing the Capabilities of the Murchison Widefield Array as a Passive Radar for the Surveillance of Space

Remote Sensing, 2022
This paper describes the use of the Murchison Widefield Array, a low-frequency radio telescope at a radio-quiet Western Australian site, as a radar receiver forming part of a continent-spanning multistatic radar network for the surveillance of space ...
Brendan Hennessy, Mark Rutten, Robert Young, Steven Tingay, Ashley Summers, Daniel Gustainis, Brian Crosse, Marcin Sokolowski   +7 more
doaj   +1 more source

AN ANALYSIS OF THE INFLUENCE OF THE NUMBER OF OBSERVATIONS IN A RANDOM FOREST TIME SERIES CLASSIFICATION TO MAP THE FOREST AND DEFORESTATION IN THE BRAZILIAN AMAZON [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2022
Remote sensing has been an essential tool in combating deforestation. However, the ever-rising deforestation rates require new remote sensing techniques. This paper presents a study to determine the effects on the accuracy of the data analysis of varying
L. S. Vieira, G. R. Queiroz, E. H. Shiguemori   +2 more
doaj   +1 more source

A Low Cost Automatic Detection and Ranging System for Space Surveillance in the Medium Earth Orbit Region and Beyond

Sensors, 2014
The space around the Earth is filled with man-made objects, which orbit the planet at altitudes ranging from hundreds to tens of thousands of kilometers.
Radu Danescu, Anca Ciurte, Vlad Turcu
doaj   +1 more source