Results 151 to 160 of about 21,397 (182)
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Study of azimuth reconstruction for distributed surface wave OTH radar
Proceedings of 2012 5th Global Symposium on Millimeter-Waves, 2012This article mainly studied in azimuth information reconstruction of distributed surface wave Over-The-Horizon radar. We deduce a new azimuth information reconstruction approach about distributed surface wave Over-The-Horizon radar through the basis of the signal model construction, which is based on the analyzing direction of echo signal and system ...
Yansong Zhang, Yeshu Yuan
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OTH radar array calibration using disparate sources
Radar Systems (RADAR 97), 1997Errors in sensor positions, unknown mutual coupling and receiver gain/phase variations are known to degrade OTH radar array performance. Hence, for OTH radar currently being developed for coastal surveillance, which incorporate antenna arrays that can be erected quickly on unprepared sites, array calibration is essential. While gain/phase errors may be
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Application of superresolution techniques to the ground OTH radar
Proceedings of National Aerospace and Electronics Conference (NAECON'94), 2002The conventional angular superresolution techniques tend to be based on the assumption of independent noise samples between array elements. In this paper, however, the unindependent real sea clutter and atmospheric noise samples are considered and supposed to be prevailing for a practical HF ground wave OTH radar system, to which some superresolution ...
null Yang Hua, null Duan Fengzeng
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Detection of ships using OTH radar with short integration times
Proceedings of the 1997 IEEE National Radar Conference, 2002Localizing and tracking ocean-going ships using high-frequency over-the-horizon radar (OTHR) currently requires long coherent integration times (CITs) and places critical demands on scarce radar resources. Here, modern spectral analysis techniques (MSATs) are employed to localize ships from clutter and noise in Doppler space using shorter CITs than are
J.A. Olkin, W.C. Nowlin, J.R. Barnum
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Knowledge-Based Adaptive Processing for Ship Detection in OTH Radar
2006 International Radar Symposium, 2006This paper is concerned with adaptive Doppler processing in high frequency (HF) over-the-horizon (OTH) radar to improve the detection of slow-moving ships against clutter. A knowledge-based adaptive detection approach that exploits additional information to identify the surfaces that scatter clutter in each radar resolution cell (i.e. land, sea or land-
G. FABRIZIO, A. FARINA, DE MAIO, ANTONIO
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HF-OTH Skywave Radar: A Method for Peak Power Evaluation
2006 International Radar Symposium, 2006This paper addresses the problem of peak power evaluation in HF OTH skywave radar. A wide number of factors affect the performance of such systems, specifically ionospheric propagation and absorption losses, as well as external radio noise interferences.
Capria A +3 more
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On model identification for distortion correction of OTH radar signals
Proceedings of ICASSP '94. IEEE International Conference on Acoustics, Speech and Signal Processing, 2002When HF skywave radars are employed for missions where high Doppler resolution is required, such as ship detection or remote sensing of the sea surface, nonstationarity of the ionospheric propagation channel within the coherent integration period often occurs to the extent that the Doppler spectrum is corrupted and the mission is unsuccessful.
S.J. Anderson, S.E. Godfrey, S.M. Voigt
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Cost Analysis of an OTH Radar System
1974Abstract : Ship-detecting (SD) land-based over-the-horizon radars are classed into two groups according to the power rating and complexity of their transmitting arrays. Type I SD systems are relatively lower powered, have little directivity in the vertical plane, and have minimal elevation-angle steering capability, whereas Type II systems are high ...
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The Application ofAAl-digital Array Receiver to OTH Radar
2006 CIE International Conference on Radar, 2006An advanced all-digital array receiver is developed for Over-The-Horizon radar application. With a current commercially available ADC chip to digitize the amplified signal from HF antenna without the requirement of conventional receiver, it greatly simplified the design of array receiver, and excellent performance can be attained.
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Inversion of OTH radar backscatter ionograms obtained by scanning in elevation
2008 IEEE Radar Conference, 2008A new inversion method to obtain the real state of the ionosphere with an oblique sounder is presented. This method takes some points on the backscatter ionogram obtained by scanning in elevation to estimate the parameters of the electronic density profile of the ionosphere.
Benito, Eulalia +4 more
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