Results 51 to 60 of about 1,166 (180)
An Analysis of the Potential for Using Over-the-Horizon Radar Systems for Space Surveillance [PDF]
, 2004 The Australian Defence Force is investigating the development of a space surveillance system. While several dedicated facilities for space surveillance are in operation around the world, Australia s Over-The-Horizon Radar (OTHR) network has some ...
Colbert, Matthew J.
core +1 more source
Transient Interference Suppression Algorithm Based on Time Frequency Sparse Prior for Skywave OTHR
Leida xuebaoThe target detection performance of skywave Over-the-Horizon Radar (OTHR) often struggles with transient interference. To address this issue, we have developed a transient interference suppression algorithm that uses Time Frequency Sparsity Prior (TFSP).
Zirui CHEN +6 more
doaj +1 more source
CONSIDERATIONS REGARDING DIFFERENT APPROACHES TO MEASURING LABOR PRODUCTIVITY [PDF]
Journal of Defense Resources Management, 2011 Assessing the productivity of factors of production has been a key issue for economists for many decades, as the development and well-being of a govenrment sector, industry or company have been very early on linked to the way in which inputs are used in ...
Maria CONSTANTINESCU
doaj
Study on the Detectability of the Sky-Surface Wave Hybrid Radar
Journal of Applied Mathematics, 2014 Working in the HF (high-frequency) band and the transmitter and receiver locating separately, the sky-surface wave hybrid radar both has the capabilities of the OTHR (over-the-horizon radar) and the advantage of the bistatic radar. As the electromagnetic
Hou Chengyu +3 more
doaj +1 more source
EclipseNB: A Network of Low‐Cost GNSS Receivers to Study the Ionosphere
Space Weather, Volume 23, Issue 1, January 2025.Abstract This work aims to demonstrate that dense networks of low‐cost dual‐frequency global navigation satellite systems (GNSS) receivers can be used to retrieve ionospheric electron content with almost the same level of accuracy as scientific‐grade GNSS receivers.
A. Kashcheyev +4 more
wiley +1 more source
Journal of Geophysical Research: Space Physics, Volume 129, Issue 11, November 2024.Abstract A network of 30‐MHz riometers distributed across Canada have been monitoring auroral absorption for decades. Electron precipitation can cause enhanced densities to develop below ∼100 km where the higher neutral density can cause absorption of High Frequency (HF) signals.
R. G. Gillies, E. Spanswick, S. Skone
wiley +1 more source
A Coordinate Registration Method for Over-the-Horizon Radar Based on Graph Matching
Remote SensingCoordinate registration (CR) is the key technology for improving the target positioning accuracy of sky-wave over-the-horizon radar (OTHR). The CR parameters are derived by matching the sea–land clutter classification (SLCC) results with prior geographic
Can Li +3 more
doaj +1 more source
Remote Sensing, 2019 The nonhomogeneous clutter is a major challenge for ship detection in high-frequency mixed-mode surface wave radar. In this paper, a geometric barycenter-based reduced-dimension space-time adaptive processing method is proposed to suppress the clutter ...
Jiazhi Zhang +4 more
doaj +1 more source
OVER –THE - HORIZON RADAR (OTHR) UNTUK MENJAGA WILAYAH UDARA DAN LAUT INDONESIA [PDF]
, 2018 Menjaga kedaulatan NKRI merupakan salah satu tugas pokok TNI seperti tercantum dalam Undang-Undang Nomor 3 tahun 2002 tentang Pertahanan Negara dan Undang-Undang Nomor 34 tahun 2004 tentang TNI. Untuk menjadi tentara profesional seperti tercantum dalam
Yudhistira, Andi
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The Geographical Journal, Volume 190, Issue 2, June 2024.Short Abstract Birmingham, Leicester, London and Manchester have emerged as England's only ‘no majority’ cities, where no single ethnic group forms more than 50% of the population. This paper looks at where the diversification of these cities has continued over the period from 2001 to 2021 or whether the reduction in the number of White British has led
Richard Harris
wiley +1 more source