Results 11 to 20 of about 232 (143)
Direction Finding Techniques for Over‐the‐Horizon Radars
IET Radar, Sonar & NavigationThere is no ultimate intelligence‐gathering discipline. Intelligence products almost always require multiple sources for further analytical processing.
M. Pacek +3 more
doaj +2 more sources
Distributed Shipborne HFHSSWR Localisation Method Based on Gaussian Markov Fields
IET Radar, Sonar & NavigationThis paper investigates a distributed shipborne high‐frequency hybrid surface‐surface wave radar (HFHSSWR) model that combines shared sky wave paths with distinct shipboard surface wave paths.
Longyuan Xu +3 more
doaj +2 more sources
Over‐the‐Horizon Direct Positioning With Ionospheric Heights Priors
IET Radar, Sonar & NavigationThis study addresses positioning errors in high‐frequency (HF) over‐the‐horizon (OTH) localisation that arise from inaccuracies in ionospheric virtual height measurements.
Shuyu Zheng, Haiying Zhang, Xiuquan Dou
doaj +2 more sources
Assessing Loggerhead Turtle Exposure to Fisheries in Northwest Africa: Predicted Risk and Management Gaps. [PDF]
Ecol EvolBiologging and Global Fishing Watch data reveal extensive spatial and vertical overlap between loggerhead turtles from the Cabo Verde population and fisheries across the Northeast Atlantic, highlighting areas of high predicted bycatch risk and gaps in current protections. ABSTRACT Bycatch is the accidental capture of non‐target animals in fishing gear,
Bowler AI +7 more
europepmc +2 more sources
Journal of Applied Mathematics, 2014 Skywave over-the-horizon (OTH) radar systems have important long-range strategic warning values. They exploit skywave propagation reflection of high frequency signals from the ionosphere, which provides the ultra-long-range surveillance capabilities to ...
Hou Chengyu, Wang Yuxin, Chen Jiawei
doaj +1 more source
Maritime Over the Horizon Sensor Integration: HFSWR Data Fusion Algorithm
Remote Sensing, 2019 In order to provide a constant and complete operational picture of the maritime situation in the Exclusive Economic Zone (EEZ) at over the horizon (OTH) distances, a network of high frequency surface-wave-radars (HFSWR) slowly becomes a necessity.
Dejan Nikolic +6 more
doaj +1 more source
Tsunami signature in the ionosphere: A simulation of OTH radar observations [PDF]
Radio Science, 2011 In the last ten years ionospheric anomalies following major earthquakes and tsunamis have been detected. Global Positioning System (GPS) and altimeters have been proven effective for this purpose, through Total Electron Content (TEC) measurement. Most of these ionospheric anomalies are deterministic and reproducible by numerical modeling via the ...
Coïsson, Pierdavide +4 more
openaire +1 more source
Array self-calibration for sky-wave over-the-horizon radar with gain-phase errors
The Journal of Engineering, 2019 This study proposes a novel algorithm for sky-wave over-the-horizon (OTH) radar array self-calibration with angle-independent gain-phase errors. The proposed method exploits backscattered echo from an ionised meteor trail, which can be considered as ...
Baiqiang Zhang, Junhao Xie
doaj +1 more source
Ionospheric decontamination for skywave OTH radar based on complex energy detector [PDF]
EURASIP Journal on Advances in Signal Processing, 2012 For over-the-horizon (OTH) radar, the ocean clutter is very strong. And this becomes a big challenge for the target detection. The clutter suppression is a very important procedure for the OTH radar. For the skywave OTH radar, the radar signal will propagate through the ionosphere. This will cause a contamination due to its unstable movement.
Wei You, Zishu He, Shuangling Wang
openaire +1 more source
Performance Analysis of a Sky-Wave Over-the Horizon Radar Simulation Tools
Revista ElektrónThis paper presents the main features of a skywave over-the-horizon radar simulation software and results on its ability to represent and detect different search scenarios.
Zenon Saavedra +4 more
doaj +1 more source