Results 181 to 190 of about 14,761 (217)

HF Surface Wave Radar Tests at the Eastern China Sea

Wave Propagation, Scattering and Emission in Complex Media, 2005
The HF surface wave radar system OSMAR2000 adopts Frequency Modulated Interrupted Continuous Waveform (FMICW) and its 120m-antenna array is transmitting receiving co-used. MUSIC and MVM are applied to obtain sea echo's direction of arrival (DOA) when extracting currents information.
Xiong Bin Wu, Feng Cheng, Shi Cai Wu, Zi Jie Yang, BiYang Wen, Zhen Hua Shi, JianSheng Tian, HengYu Ke, HuoTao Gao   +8 more
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Comparisons of different HF ocean surface-wave radar technologies

2015 IEEE/OES Eleveth Current, Waves and Turbulence Measurement (CWTM), 2015
The HF ocean radar industry offers two main genres of the technology which have some characteristics in common, but which are technically sufficiently different that the customer has a real choice. The crossed loop genre has small antenna footprints, and with the 180° panoramic view can be daisychained to good economic advantage.
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Adaptive radio frequency interference mitigation for HF surface wave radar

ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004., 2005
The paper analyses the characteristics of radio frequency interference (RFI) in HF surface wave radar (HFSWR) which adopt the linear frequency modulated interrupted continuous wave (FMICW). RFI will influence all the range cells including all the positive and negative frequency, and that the negative frequency range cells contain only the interference ...
null Xianrong Wan, null Biyang Wen, null Hengyu Ke   +2 more
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Hard threshold correlation detector for mobile HF Surface Wave Radar

2012 13th International Radar Symposium, 2012
Mobile HF Surface Wave Radar (SWR) can be realized by an offshore distributed receiver array structure which communicates to the central processing unit at the base station via a wireless link. State of the art detectors demand a sophisticated signal processing which can only be done at base station hence making it imperative to transmit raw data form ...
Anshu Gupta, Th. Fickenscher
openaire   +1 more source

Radio frequency interference reduction for HF surface wave radar applications

IET International Conference on Radar Systems (Radar 2012), 2012
High-frequency (HF) surface wave radar systems located at the coast are well-known as a measurement tool for coastal monitoring. Nevertheless, HF radar performance suffers from external radio frequency interference (RFI) signals generated by other HF-band users.
A. Dzvonkovskaya, H. Rohling
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Estimation of target altitude in HF surface wave radar

7th International Conference on High Frequency Radio Systems and Techniques, 1997
HF surface wave radars (HFSWR) are the only long range ground based radar systems that can detect targets down to sea level, at ranges of tens to several hundreds of kilometers. This unique detection capability is a result of the low attenuation over salt water of vertically polarised HF radio waves, and makes the HFSWR ideally suited to the detection ...
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Sporadic-E ionospheric clutter suppression in HF surface-wave radar

IEEE International Radar Conference, 2005., 2005
The unwanted radar echoes from the ionosphere are collectively called ionospheric clutter. It has proved to be the greatest impediment to achieving consistently good performance in long-range detection of surface vessels and sea state monitoring for HF surface wave radar (HFSWR).
null Wan Xianrong, null Cheng Feng, null Ke Hengyu   +2 more
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Performance evaluation of correlation detector for HF Surface Wave Radar

2012 Asia Pacific Microwave Conference Proceedings, 2012
HF Surface Wave Radar (SWR) can provide cost effective coastal surveillance. Recently invented correlation detector observes the correlation of received power along the azimuth axis across neighboring Range Doppler (RD) cells to detect the presence of a target in a given RD cell.
T. Fickenscher, A. Gupta, P. Ludwig
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Experimental Evaluation of the Range–Doppler Coupling on HF Surface Wave Radars

IEEE Geoscience and Remote Sensing Letters, 2013
High-frequency surface wave radar (HFSWR) is used in oceanography to monitor surface wind waves and currents and, more recently, to detect ships in maritime surveillance. The radar accuracy is affected by range-Doppler coupling, which yields a displacement in the measured range proportional to the target radial velocity, i.e., the Doppler shift in the ...
Bruno, Luigi, Braca, Paolo, Horstmann, Jochen, Vespe, Michele   +3 more
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Sea Surface Current–Wave–Wind Interactions Measured by Coastal Ground Wave HF Radars

IEEE Geoscience and Remote Sensing Letters, 2008
The performance and operational feasibility of the high-frequency Wellen Radar Doppler radar have been demonstrated in a region dominated by strong tidal currents during the SURveillance LITtorale OPerationnelle experiment in Brittany (France). Local weather-oceanic phenomena (current-wave-wind interactions) were measured for the first time by temporal-
V. Cochin, V. Mariette, R. Garello
openaire   +1 more source