Results 231 to 240 of about 127,490,332 (269)

Skywave over-the-horizon backscatter radar

2001 CIE International Conference on Radar Proceedings (Cat No.01TH8559), 2002
Skywave over-the-horizon backscatter radar (OTHR) has great potential for detecting such targets as cruise missiles, stealth aircraft, the powered trajectory of ballistic missiles and aircraft carriers over long distances and at the same time. This paper evaluates the detectability of OTHR for small targets through experimental research and emulation ...
null Tang Xiaodong, null Han Yunjie, null Zhou Wenyu   +2 more
openaire   +1 more source

Over-The-Horizon Radar (OTHR) In Canada

2018 19th International Radar Symposium (IRS), 2018
OTHRs have recently been making a comeback in Canada, as the need for accurate long-range tracking becomes more important, and less-expensive, ground based radars are once again being considered for more effective long-range surveillance of Canadian airspace.
Thayananthan Thayaparan, Yousef Ibrahim, John Polak, Ryan Riddolls   +3 more
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Coherence in over-the-horizon radar

SPIE Proceedings, 2003
The coherence of successive dwells from an Over-the-Horizon (OTH) High-Frequency (HF) radar (3-30 MHz) is investigated using a technique based on the spectrogram. Although the data are coherent within a dwell, it is not known if coherence is preserved from one dwell to the next, due to possible limitations of the signal processor.
openaire   +1 more source

New horizons for over-the-horizon radar?

IEEE Antennas and Propagation Magazine, 1994
Science stands to benefit from the quarter century of research and development, and $1.5 billion spent by the Air Force, to deploy six over-the-horizon (OTH-B) air-defense radars, now targeted for shutdown. Opportunities for environmental research and services on a grand scale beckon to anyone who can afford to operate and maintain them. Tests show the
T.M. Georges, J.A. Harlan
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Over-the-horizon radar

1999
There are two forms of 0TH radar, surface-wave and skywave. Surface-wave systems are relatively inexpensive and have found applications in sea sensing (see next chapter), for the defence of localized areas against low-flying missiles and to some extent for monitoring ship traffic.
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CFAR techniques for over-the-horizon radar

IEEE International Symposium on Intelligent Signal Processing, 2003, 2004
Since the OTHR background noise is too strong, the target echoes would be embedded in sea clutter and environment noise. In order to detect targets such as ships or aircrafts from radar returns, a range Doppler CFAR schemes is presented, the identical Doppler frequency resolution cells over adjacent range or azimuth resolution cells are used to form a ...
null Meng Xiangwei, null Guan Jian, null He You   +2 more
openaire   +1 more source

Multiple model approach to over-the-horizon radar tracking

2017 20th International Conference on Information Fusion (Fusion), 2017
For the over-the-horizon radar (OTHR) based target tracking, the reflecting height of the ionosphere, which reflects radar signals, is important. Existing methods assume that this height is exactly known a priori. In practice, however, we can only determine its range, not its specific value.
Leilei Guo, Jian Lan, X. Rong Li
openaire   +2 more sources

Maximum likelihood coordinate registration for over-the-horizon radar

IEEE Transactions on Signal Processing, 1997
Over-the-horizon radar exploits the refractive and multipath nature of high-frequency propagation through the ionosphere to achieve wide-area surveillance. The coordinate registration process converts the group delays and azimuths (i.e., slant coordinates) from a set of multipath target returns to an estimate of its location (i.e., ground coordinates).
Jeffrey L. Krolik, Richard H. Anderson
openaire   +2 more sources

High Frequency Over-the-Horizon Radar

2019 IEEE Radar Conference (RadarConf), 2019
Presents a collection of slides covering the following topics: high frequency over-the-horizon radar; HF channel model; time-varying adaptive beamforming; space-time adaptive processing; GLRT detection schemes; HF passive radar; blind signal separation; multipath-driven geolocation and MIMO OTHR concept.
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Detection and Tracking of Multipath Targets in Over-the-Horizon Radar

IEEE Transactions on Aerospace and Electronic Systems, 2019
In skywave over-the-horizon radar, the ionosphere often supports multiple propagation paths, and a single target can appear as a family of returns. This paper presents two new tracking approaches for this environment: The first uses measurement fusion, and the second uses group-target track-before-detect algorithm.
Samuel J. Davey, Giuseppe A. Fabrizio, Mark G. Rutten   +2 more
openaire   +1 more source