Results 171 to 180 of about 14,761 (217)

Ionospheric Clutter Suppression in HF Surface Wave Radar OSMAR

2006 7th International Symposium on Antennas, Propagation & EM Theory, 2006
Experimental 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

Design of reconfigurable receiver for HF surface wave radar

10th IET International Conference on Ionospheric Radio Systems and Techniques (IRST 2006), 2006
The paper describes the design of receiving system for short-range high frequency surface wave radar, which employs monopole/cross-loop antenna (one monopole and two cross-loops). The frequency synthesis of system is provides by two DDS chips, whose working clock comes from the same clock source.
null Bai Liyun, null Wen Biyang, null Yang Jing, null Shen Wei   +3 more
openaire   +1 more source

Vessel Target Monitoring with Bistatic Compact HF Surface Wave Radar

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020
Compared with transmit/receive (T/R) monostatic High-frequency surface wave radar (HFSWR), the T-R bistatic HFSWR has the advantages of flexibility, receiver concealment and large coverage because of the separation between the radar transmitter and receiver locations.
Yonggang Ji, Jie Zhang, Yiming Wang, Junmin Meng, Changjun Yu, Ming Li, Weifeng Sun   +6 more
openaire   +1 more source

Sea clutter canceller for shipborne HF Surface Wave Radar

2011 International ITG Workshop on Smart Antennas, 2011
A new type of beamformer has been proposed which uses dynamic clutter cancellation with the help of an auxiliary beam in an external clutter limited scenario like shipborne HF Surface Wave Radar (SWR). The beamformer is compact, ensures reasonable azimuth resolution and unlike the conventional beamformers the azimuth resolution decays gracefully in low
Anshu Gupta, Thomas Fickenscher
openaire   +1 more source

Improved range resolution for FMCW HF surface wave radar

2010 IEEE International Conference on Wireless Information Technology and Systems, 2010
A modified signal processing for FMCW waveform has been proposed that yields an improved range resolution without increasing the transmitted signal bandwidth. The chirp duration is reduced by an appropriate factor while the interval of the beat signal sequence considered for the range transform is kept constant.
Th. Fickenscher, R. Herschel, M. Holters, A. Gupta, J. Hinz   +4 more
openaire   +1 more source

Non-stationary interference cancellation in HF surface wave radar

2003 Proceedings of the International Conference on Radar (IEEE Cat. No.03EX695), 2004
High frequency (HF) interference in surface wave over-the-horizon (OTH) radars typically exhibits a time-varying or non-stationary spatial structure. Adaptive beamformers that update the spatial filtering weight vector within the coherent processing interval (CPI) are likely to suppress such interference most effectively, but the intra-CPI antenna ...
G.A. Fabrizio, A.B. Gershman, M.D. Turley   +2 more
openaire   +1 more source

EMC study of a shipboard HF surface wave radar

Proceedings of International Symposium on Electromagnetic Compatibility, 2002
This paper presents the results of a feasibility study of a high frequency surface wave radar (HFSWR) on a navy ship. The electromagnetic compatibility (EMC) and transmit antenna design issues are addressed.
S.T. Li, L.B. Koyama, J.H. Schukantz, R.J. Dinger   +3 more
openaire   +1 more source

Optimisation of bistatic HF surface wave radar configurations

IET International Conference on Radar Systems 2007, 2007
HF surface wave radars are increasingly being deployed in bistatic configurations, usually via the mechanism of overlapping the coverage of two monostatic radars and sharing signals, but sometimes as intrinsically bistatic radar designs. In either case, the advantages which may attach to bistatic scattering geometries may easily be compromised by ...
openaire   +1 more source

HF surface wave radar management techniques applied to surface craft detection

Record of the IEEE 2000 International Radar Conference [Cat. No. 00CH37037], 2002
HF radar is a unique land or ship based sensor which provides over the horizon (OTH) target detection. In the absence of microwave ducting, which is not a reliable environmental feature, HF radar operating in the 3-30 MHz band offers the primary method of obtaining target returns from beyond the conventional radar horizon.
D.G. Money, D.J. Emery, T.M. Blake, C.F. Clutterbuck, S.J. Ablett   +4 more
openaire   +1 more source

Directional wave spectrum measurement with multistatic HF surface wave radar

IGARSS 2000. IEEE 2000 International Geoscience and Remote Sensing Symposium. Taking the Pulse of the Planet: The Role of Remote Sensing in Managing the Environment. Proceedings (Cat. No.00CH37120), 2002
HF surface wave radars (HFSWR) measure sea surface currents and current profiles via the Doppler shift of the discrete (first-order scattering) line structure in the radar Doppler spectrum. They can also exploit the higher-order scattering contributions to the Doppler spectrum which yield information on the sea surface directional spectrum in the ...
openaire   +1 more source