scholarly journals A novel dual-channel HF radar system for ionospheric sounding

2018 ◽  
Vol 7 (1) ◽  
pp. 25-30
Author(s):  
Lei Qiao ◽  
Liang Huang ◽  
Xiao Cui
Keyword(s):  
Radar System ◽  
Hf Radar ◽  
Dual Channel ◽  
Ionospheric Sounding

HF radar receiver designed for surface current radar system

2006 ◽  
Author(s):  
Shen Wei ◽  
Wen Biyang ◽  
Wu Shicai ◽  
Bai Liyun ◽  
Zhou Hao ◽  
...  
Keyword(s):  
Surface Current ◽  
Radar System ◽  
Hf Radar

scholarly journals Evaluating Radial Current Measurement of Multifrequency HF Radar with Multidepth ADCP Data during a Small Storm

2015 ◽  
Vol 32 (5) ◽  
pp. 1071-1087 ◽  
Author(s):  
Chen Zhao ◽  
Zezong Chen ◽  
Gengfei Zeng ◽  
Longgang Zhang ◽  
Fei Xie
Keyword(s):  
Wind Speed ◽  
Correlation Coefficient ◽  
Correlation Coefficients ◽  
Radar System ◽  
Hf Radar ◽  
Residual Currents ◽  
Radio Wavelength ◽  
Effective Depth ◽  
Different Depths ◽  
Adcp Data

AbstractA multifrequency high-frequency (MHF) radar system was designed and developed by Wuhan University in 2007. This system can simultaneously operate at four frequencies mainly in the 7.5–25-MHz band. This paper focuses on discussing the performances of an MHF radar system deployed along the coast of the East China Sea based on comparisons with multidepth ADCP datasets, which were obtained from ADCPs deployed at different locations in August 2010 during a small storm. The comparisons illustrate that radar-derived radial currents are correlated with ADCP data at mainly a 2–4-m depth with correlation coefficients over 0.95 and RMS differences less than 0.12 m s−1 for both operating frequencies. Bearing offsets at points A, C, and D are computed for different operating frequencies with magnitudes of 0°–11°.The capability of MHF radar to measure currents at different depths is explored. The results indicate that the effective depth of current measurements by MHF radar increases with decreasing operating frequency. A linear regression (with a regression coefficient of 0.0576) of the responses in the mean effective depth on the predictors in radio wavelength is obtained. The dominant semidiurnal and diurnal constituents are also analyzed. The radial current amplitudes of the M2 and K1 constituents are strong in this area during this experiment. The residual currents vary with wind speed, with a correlation coefficient of 0.52. A correlation coefficient of 0.79 between nontidal currents and the radial wind speed after a clockwise rotation of the wind vector by about 50° was obtained.

Phase Corrections of Small-Loop HF Radar System Receive Arrays With Ships of Opportunity

2006 ◽  
Vol 31 (4) ◽  
pp. 919-921 ◽  
Author(s):  
Daniel M. Fernandez ◽  
John F. Vesecky ◽  
Calvin Teague
Keyword(s):  
Radar System ◽  
Hf Radar ◽  
Small Loop ◽  
Phase Corrections

Real-time procedures implemented within coastal HF radar system in the northern Adriatic

2009 ◽  
Author(s):  
I. Vilibic ◽  
V. Dadic ◽  
D. Ivankovic ◽  
S. Muslim ◽  
J. Sepic ◽  
...  
Keyword(s):  
Real Time ◽  
Radar System ◽  
Hf Radar ◽  
Northern Adriatic

scholarly journals Research on Polarization Cancellation of Nonstationary Ionosphere Clutter in HF Radar System

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Xingpeng Mao ◽  
Hong Hong ◽  
Weibo Deng ◽  
Yongtan Liu
Keyword(s):  
Surface Wave ◽  
Time Domain ◽  
High Frequency ◽  
Interference Cancellation ◽  
Radar System ◽  
Experimental Results ◽  
Hf Radar ◽  
Oblique Projection ◽  
Polarization Filter ◽  
Wave Radar

Oblique projection polarization filter (OPPF) can be applied as an effective approach for interference cancellation in high-frequency surface wave radar (HFSWR) and other systems. In order to suppress the nonstationary ionosphere clutter further, a novel OPPF based clutter suppressing scheme is proposed in this paper. The polarization and nonstationary characteristic of the clutter are taken into account in the algorithms referred to as range-Doppler domain polarization suppression (RDDPS) and the range-time domain polarization suppression (RTDPS) method, respectively. The RDDPS is designed for weak ionosphere clutter and implemented in the range-Doppler domain directly, whereas the RTDPS algorithm is designed to suppress the powerful ionosphere clutter with a multisegment estimation and suppression scheme. About 15–23 dB signal to interference ratio (SIR) improvement can be excepted when using the proposed method, whereas the targets can be more easily detected in the range-Doppler map. Experimental results demonstrate that the scheme proposed is effective for nonstationary ionosphere clutter and is proven to be a practical interference cancellation technique for HFSWR.

scholarly journals Spatio-Temporal Metocean Measurements for Offshore Wind Power

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Lucy Wyatt ◽  
Keyword(s):  
Wind Farm ◽  
Radar System ◽  
Hf Radar ◽  
Offshore Wind ◽  
Offshore Wind Power ◽  
The North ◽  
South Wales ◽  
Wind Measurements ◽  
Spatio Temporal ◽  
And Performance

This paper presents the case for the use of HF radar to provide wave, current and wind measurements and maps during the surveying, resource and impact assessment, construction, maintenance and performance assessment phases of an offshore fixed or floating wind farm or other marine renewable project. The data presented are from the Celtic Sea which is currently the focus of a lot of offshore wind interest. The data are from a dual radar system deployed at the Wave Hub site off the Cornwall coast since 2011, a single radar system in North Devon reactivated in 2017, and data from 2005 when the North Devon radar was operated as a dual radar with a second site in South Wales. The accuracy of the wave and wind data is discussed and examples of the sort of data that could be available are presented.

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