Results 11 to 20 of about 361,062 (255)
The Direction Finding Ambiguity Analysis for 3 Element and 4 Element Phase Interferometer DF System
Journal of the Korea Institute of Military Science and Technology, 2014 ABSTRACT In this paper, we have proposed a novel method which can analysis the direction finding ambiguity analysis for array geometry in 3 channel and 4 channel multiple baseline direction finding system. Generally, the direction finding ambiguity in the 3 element and 4 element phase interferometer direction finding system is calculated by the ...
Jung-Hoon Lee, Jong-Myung Woo
openaire +2 more sources
IEEE Access, 2022 This paper proposes the design of a gain enhanced single circular patch radiator (SCPR) with a cavity-backed structure using multiple substrate integrated waveguide (SIW) feeders for monopulse systems.
Sangwoon Youn +3 more
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Not only the butterflies: managing ants on road verges to benefit Phengaris (Maculinea) butterflies [PDF]
, 2010 Obligate myrmecophilic butterfly species, such as Phengaris (Maculinea) teleius and P. nausithous, have narrow habitat requirements. Living as a caterpillar in the nests of the ant species Myrmica scabrinodis and M.
Gestel, R., van +3 more
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A Novel Nonlinear LPDA Design for HF Direction Finding
International Journal of Antennas and Propagation, 2019 A novel design of log-periodic dipole array (LPDA) for high-frequency direction finding (DF) is presented. The traditional Carrel method employs fixed values of scale factor and spacing factors in LPDA designs. Here, we propose a design method which uses
Xiaofei Ren, Hu Li, Shuxi Gong
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Strongly Monotone Drawings of Planar Graphs [PDF]
, 2016 A straight-line drawing of a graph is a monotone drawing if for each pair of vertices there is a path which is monotonically increasing in some direction, and it is called a strongly monotone drawing if the direction of monotonicity is given by the ...
Felsner, Stefan +5 more
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Two Rapid Power Iterative DOA Estimators for UAV Emitter Using Massive/Ultra-Massive Receive Array
Drones, 2023 To provide rapid direction finding (DF) for unmanned aerial vehicle (UAV) emitters in future wireless networks, a low-complexity direction of arrival (DOA) estimation architecture for massive multiple-input multiple-output (MIMO) receiver arrays is ...
Yiwen Chen +10 more
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Lattice fence and hedge barriers around an apiary increase honey bee flight height and decrease stings to people nearby [PDF]
, 2014 Urban beekeeping is becoming more popular in the UK. One of the challenges faced by urban beekeepers is finding a suitable apiary location. Honey bees are often perceived as a nuisance, mainly due to their stinging behaviour. Here, we experimentally test
ALTON K +6 more
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An Ultra-Wide Band Antenna System for Pulsed Sources Direction Finding
Sensors, 2020 Electric discharges in high-voltage power distribution systems can be localized through their electromagnetic signature in the radio-frequency range.
Razvan D. Tamas, Stefania Bucuci
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Design of a Broadband Coupled-Fed Printed Dipole Antenna as an Array Element for Direction Finding Systems [PDF]
Journal of Electromagnetic Engineering and Science, 2019 This article proposes the design of a coupled-fed printed dipole antenna for direction finding (DF) systems. The antenna consists of a radiating 50° angled expanded-arm printed dipole as well as a fan-shaped feeder that is located on the opposite side of
Sungsik Wang +4 more
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Direction finding of auroral VLF hiss in auroral zone
Antarctic Record, 1981 A newly developed direction finding ('DF') for auroral hiss based on the measurement of time differences of wave arrival among three spaced points was carried out around Syowa Station (geomag. lat. -70.4°), Antarctica in 1978-1979. It has been found that
Masanori Nishino, Takeo Hirasawa
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