Results 131 to 140 of about 65,382 (157)
Some of the next articles are maybe not open access.
Ionospheric Clutter Suppression in HFSWR Using Multilayer Crossed-Loop Antennas
IEEE Geoscience and Remote Sensing Letters, 2014Ionospheric clutter resulting from undesired radio signals reflected by the ionosphere severely deteriorates the detection performance of the high-frequency surface wave radar (HFSWR) in the mid- and low-latitude regions. To solve this problem, we propose a novel antenna configuration and method, i.e., using vertically placed, coaxial, multilayer ...
Hao Zhou 0002, Biyang Wen, Shicai Wu
openaire +2 more sources
Characteristic Investigation of Ionospheric Clutter of a Coastal High-Frequency Radar
2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO), 2018High frequency (HF) radar can overcome the limits caused by the curvature of the earth when its electromagnetic wave operated over high conductivity sea water. The HF radar spectrum is critical for large-area current mapping because of mechanism of Bragg resonance.
Yu Jen Chung +4 more
openaire +1 more source
Ionospheric Clutter Suppression in HF Surface Wave Radar OSMAR
2006 7th International Symposium on Antennas, Propagation & EM Theory, 2006Experimental trials conducted from 2003 to 2005 in cast China sea demonstrated that HF surface wave radar (HFSWR) OSMAR (Ocean State Monitor and Analysis Radar) could be strongly affected by scattering from ionospheric structures and irregularities.
Wan Xianrong, Xiong Xinlong, Ke Hengyu
openaire +1 more source
Ionospheric clutter model for high frequency surface wave radar
2012 IEEE Radar Conference, 2012The detection performance of a high frequency surface wave radar (HFSWR) system is primarily limited by clutter, especially ionospheric clutter. Therefore, in order to analyze and/or simulate the capabilities of an HFSWR system a model for the clutter is required.
M. Ravan, R. S. Adve
openaire +1 more source
Ionospheric clutter analysis and suppression in a distributed MIMO-HFSWR system
OCEANS 2014 - TAIPEI, 2014In distributed MIMO (multiple-input-multiple-output)-HFSWR (high frequency surface wave radar), multiple detection modes are introduced to enrich the detection information, however making ionospheric clutter more complicated. In this paper, a distributed MIMO-HFSWR system involving three monostatic radars is introduced.
Xu Xing-an +3 more
openaire +1 more source
Ionospheric clutter suppression using Wavelet Oblique Projecting Filter
2017 IEEE Radar Conference (RadarConf), 2017The detection performance of High Frequency Surface Wave Radar (HFSWR) is influenced by the nonstationary ionospheric clutter. For decades, ionospheric clutter suppression is always a challenging problem. Targets and ionospheric clutter have different 2D scale features in Range-Doppler map (RD map) of radar because of different stationarity and range ...
Yuan Su +3 more
openaire +1 more source
Ionosphere clutter suppression based on sparse space spectrum rebuild beamforming
2016 CIE International Conference on Radar (RADAR), 2016Conventional beamforming method is sensitive to the error of the array system, and easy to cause the desired signal self-cancellation phenomenon, especially when SNR is high. However, the strong ionosphere clutter often appears in the high frequency surface wave radar. These clutter will make the traditional beamforming algorithm ineffective.
Jianyu Zhou, Gaopeng Li, Rongqing Xu
openaire +1 more source
Sea clutter simulation for skywave radar considering ionospheric diffuse scattering
2017 IEEE Radar Conference (RadarConf), 2017Ionospheric diffuse scattering is an important factor which leads to spread-Doppler clutter (SDC) in skywave radar. However, it is often ignored in a sea clutter model. In this paper, a sea clutter model for skywave radar considering ionospheric diffuse scattering was established.
Yueyu Guo, Yinsheng Wei, Rongqing Xu
openaire +1 more source
The correlation analysis of ionospheric clutter and noise using SeaSonde HF radar
OCEANS 2017 - Aberdeen, 2017High-frequency (HF) ground wave radar's over-the-horizon property can effectively overcome the restraints posed by the curvature of the earth. HF radar transmits low-power radar waves and its detection distance is up to several hundred kilometers. However, radar in HF bands may be easily contaminated by noise, which has temporal and spatial variability,
Yu Jen Chung +4 more
openaire +1 more source
High frequency radar clutter power for mixed ionosphere-ocean propagation
2014 16th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM), 2014Ionospheric clutter is one of the main sources of interference affecting the performance of high frequency surface wave radar (HFSWR). One component of this arises from a portion of the transmitted radar signal which is reflected from the ionosphere to the ocean surface, from whence it is backscattered to the receiving antennas.
John Walsh +3 more
openaire +1 more source