Results 141 to 150 of about 678 (183)

Presegmentation-based adaptive CFAR detection for HFSWR

2012 IEEE Radar Conference, 2012
Common tasks of High-Frequency Surface Wave Radars (HFSWRs) are long-range ocean state monitoring and maritime surveillance with a strong focus on the detection of ships. Due to the heterogeneous background composed of sea-clutter and external noise the application of Constant False Alarm Rate (CFAR) algorithms with a single parameter set are likely to
J. O. Hinz, M. Holters, U. Zolzer, A. Gupta, T. Fickenscher   +4 more
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Suppression of Ionospheric Es Clutter in HFSWR

2006 CIE International Conference on Radar, 2006
Ionospheric clutters from sporadic E-layer are often observed in 200 km-coverage HFSWR. One kind of the Es-layer clutters is found to have coherent time much longer than that of sea echoes. The feature is exploited in the proposal of a new algorithm to suppress this kind of clutter based on eigen value decomposition and subspace ...
Yin Wei, Wu Xiongbin, Cheng Feng, Wan Xianrong   +3 more
openaire   +1 more source

STAP process of shipborne HFSWR motion compensation

2012 IEEE 11th International Conference on Signal Processing, 2012
In this paper, analysis of the broadening effect of the first-order sea clutter in the HFSWR (High Frequeny Surface Waves Radar) radar system of moving shipborne platform is given. The platform is moving in six degrees of freedom (DOF) and the model of movement has been built.
Zhenyuan Ji, Zaiyang Duan, Junhao Xie, Yang Li   +3 more
openaire   +1 more source

Performance analysis of target detection with compact HFSWR

2016 CIE International Conference on Radar (RADAR), 2016
High frequency surface wave radar (HFSWR) can continuously detect and track vessel targets over the horizon in real time. Compact HFSWR with a small aperture has the advantage of occupying smaller radar site, lower power consumption, easy deployment and maintenance.
Yonggang Ji, Jie Zhang, Yiming Wang, Guanghong Chang, Weifeng Sun   +4 more
openaire   +1 more source

Track Matching Based on ELM for HFSWR

2019 Chinese Automation Congress (CAC), 2019
High frequency surface wave radar (HFSWR) plays an important role in marine surveillance and target tracking. However, in the complex environment of interference, the ship target signals will be submerged, which lead to track breakage and miscorrelation.
Ling Zhang, Wang Xiong, Jiong Niu, Q. M. Jonathan Wu, Yonggang Ji, Liping Zeng   +5 more
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A small array HFSWR system for ship surveillance

IET International Radar Conference 2015, 2015
A HFSWR system with portable small array for ship targets surveillance has been developed recently. The antennas of the radar system contain a receiving antenna array of eight-elements and an omnidirectional transmitting antenna, which can be deployed rapidly when relocated to another radar site. The configuration and the relationship of each subsystem
Y.G. Ji, J. Zhang, Y.M. Wang, X.L. Chu, C.J. Yu, A.J. Liu, M. Li, J. Niu, L. Zhang, W.F. Sun   +9 more
openaire   +1 more source

Optimum weights of DPCA processing for shipborne HFSWR

ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344), 2002
The displaced phase center antenna (DPCA) can be used to detect a ship in broadened first order Bragg lines due to platform motion in shipborne HFSWR (high frequency surface wave radar). In the paper it is shown that, by an analogy with the optimum weights of MTI (moving target indicator), the DPCA processing introduced by Xie et al.
null Junhao Xie, null Yeshu Yuan, null Yongtan Liu   +2 more
openaire   +1 more source

Broad Beam HFSWR Array Calibration Using Sea Echoes

2006 CIE International Conference on Radar, 2006
A novel technique to calibrate nonlinear array of HFSWR (HF Surface Wave Radar) by exploiting single-DOA (Direction of Arrival) sea echoes only is presented. It works online to supply precise channel unmatching factors in real time without interrupting regular radar operating. The technique exhibits excellent robusticity and practicability when applied
Wu Xiongbin, Cheng Feng, Yang Zijie, Ke Hengyu   +3 more
openaire   +1 more source

HFSWR based on synthetic impulse and aperture processing

IEE Proceedings - Radar, Sonar and Navigation, 2006
A novel high-frequency surface wave radar (HFSWR) has been proposed, which is based on the principles of synthetic impulse and aperture processing. It uses multiple omnidirectional transmit antennae to simultaneously transmit a set of orthogonal waveforms, and the echoed signals are received and processed by one or multiple reception arrays.
H. Su, H. Liu, P. Shui, S. Zhang, Z. Bao
openaire   +1 more source

Bi-static and multi-frequency experiments of HFSWR

OCEANS 2009, 2009
High Frequency Surface Wave Radar is currently a well-known surveillance system for the Exclusive Economic Zone. We are still trying to improve their performances and reliability. In this new research step, we are trying to assess the benefits of multi-static as well as multi-frequency configuration. The global ambition is obviously to overcome clutter
M. Menelle, F. Jangal, V. Bazin, D. Lecoz, G. Auffray   +4 more
openaire   +1 more source