Results 101 to 110 of about 218 (135)

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

A new method for ionospheric clutter suppression in HFSWR

Proceedings of 2011 IEEE CIE International Conference on Radar, 2011
High frequency surface wave radar (HFSWR) is an effective early warning radar, but the detection performance is impacted by the ionospheric clutter seriously. In order to suppress the ionospheric clutter, a segment accumulation algorithm is proposed, based on the time-frequency characteristics of the ionospheric clutter.
null Shang Shang, null Zhang Ning, null Li Yang   +2 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

Maritime surveillance using multi-frequency HFSWR

OCEANS 2016 - Shanghai, 2016
In these decades, great interest has been directed toward high frequency surface wave radars (HFSWR) as long range early warning tools in maritime surveillance. But HFSWR exhibit some shortcomings that need to be taken into account when detecting targets, such as poor azimuth resolution and significant presence of clutter.
Zezong Chen, Chao He, Chen Zhao, Longgang Zhang   +3 more
openaire   +1 more source

Progress in HFSWR research at Harbin Institute of Technology

2003 Proceedings of the International Conference on Radar (IEEE Cat. No.03EX695), 2004
The Experimental HF Surface Over-The-Horizon Radar set up in the late of 80s has been updated by installation of multi-channel receivers with digitization at the second IF stage, new designed transmitting and receiving antennas, wideband solid-state power amplifiers, frequency synthesizer with low phase noise and flexible signal generator, a new radar ...
null Yongtan Liu, null Rongqing Xu, null Ning Zhang   +2 more
openaire   +1 more source

Experimental analysis of sea clutter in shipborne HFSWR

IEE Proceedings - Radar, Sonar and Navigation, 2001
The spreading of the dominant first order Bragg lines in shipborne HFSWR (high-frequency surface wave radar) severely obscures targets with Doppler frequencies within the spreading domain. STAP (space-time adaptive processing) is one of the effective methods for solving the problem.
J. Xie, Y. Yuan, Y. Liu
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

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

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

HFSWR Performance Analyses in a Typical Equatorial Environment

2019 14th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS), 2019
In this paper a performance analysis of an High Frequency Surface Wave Radar (HFSWR) in a typical equatorial environment is presented. Statistical properties of HFSWR working environment (noise/clutter) and targets statistical properties are analyzed and mathematically modeled.
Snezana Puzovic, Zoran Cica, Ivan Gluvacevic, Pavle Petrovic, Dejan Nikolic   +4 more
openaire   +1 more source