Results 101 to 110 of about 820,012 (137)

A General Presentation About the OTH-Radar NOSTRADAMUS

, 2006
International audienceONERA, funded by the French Ministry of Defence has conducted the realization and experimentations of the Doppler Skywave OTH Radar called NOSTRADAMUS.
Dorey, P., Bazin, V., Rannou, V., Munoz, J., Auffray, Gilbert, Lesturgie, Marc, Molinie, J.P., Saillant, S., S. Saillant, G. Auffray, M. Lesturgie, J.P. Molinie, V. Rannou, J. Munoz, P. Dorey, V. Bazin   +15 more
exaly   +2 more sources

Some of the next articles are maybe not open access.

Related searches:

Ship target detection for HF groundwave shipborne OTH radar

IEE Proceedings - Radar, Sonar and Navigation, 1999
The spreading of the first order Bragg lines that result from movement of the radar platform will obscure targets with Doppler frequencies within the range of this spreading. This is the main difficulty for HF groundwave OTH radar in detecting ship targets in a shipboard environment. In the paper, the properties of the spread spectrum are analysed with
Gao Xingbin, Zong Chengge
openaire   +1 more source

HF-OTH Skywave Radar: A Method for Peak Power Evaluation

2006 International Radar Symposium, 2006
This 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, BERIZZI, FABRIZIO, Soleti R, DALLE MESE, ENZO   +3 more
openaire   +2 more sources

Modeling and performance of HF/OTH radar target classification systems

IEEE Transactions on Aerospace and Electronic Systems, 1992
The effects of a class of multipath propagation channels on the performance of a over-the-horizon (OTH) radar target classification system are considered. A Rician frequency-selective fading channel model is employed to characterize the effects of the multipath propagation medium and evaluate the performance of radar target classification systems.
D.J. Strausberger, N.F. Chamberlain, F.D. Garber, E.K. Walton   +3 more
openaire   +1 more source

Fetch limited sea scattering spectral model for HF-OTH skywave radar

2010 IEEE International Geoscience and Remote Sensing Symposium, 2010
Sea Normalized RCS, and Doppler spectra have been revised for HF-OTH Clutter Modelling. The Hasselmann model is firstly introduced to predict the sea directional spectrum of fetch-limited sea and results have been compared with the Pierson-Moskovitz model used for large scale ocean remote sensing.
Riccardo Paladini, Enzo Dalle Mese, Fabrizio Berizzi, Andrea Garzelli, Marco Martorella, Amerigo Capria   +5 more
openaire   +2 more sources

Consideration of reciprocal mixing in HF OTH radar design

7th International Conference on High Frequency Radio Systems and Techniques, 1997
The purpose of this paper is to examine reciprocal mixing in the context of HF OTH radar, and to prescribe acceptable limits on phase noise spectral density which determine that the receiving system remains externally noise limited. The paper firstly describes the manner in which the fundamental sources of phase noise within a typical HF radar ...
openaire   +1 more source

Detection, classification and correction of ionospheric distortion in HF skywave (OTH) radar systems

Proceedings of International Radar Conference, 2002
HF skywave radar performance is often severely degraded by nonstationarity of the ionospheric propagation channel, so recognition and correction of distortion and contamination is a vital part of the radar signal processing sequence. As a consequence of the variety of physical mechanisms responsible for such degradation, a corresponding number of model-
S.J. Anderson, Y.I. Abramovich
openaire   +1 more source

Range sidelobes suppression for wideband randomly discontinuous spectra OTH-HF radar signal

Proceedings of the 2004 IEEE Radar Conference (IEEE Cat. No.04CH37509), 2004
Over-the-horizon (OTH) HF radars work in a heavily congested HF band. It is quite difficult to find broad clear frequency bands for system requirements. The randomly discontinuous spectra (RDS) signal is employed to combat spectrum congestion since it can evade the external interferences in the frequency domain.
null Dongpo Zhang, null Xingzhao Liu
openaire   +1 more source

OTH radar phenomenology: signal interpretation and target characterization at HF

IEEE Aerospace and Electronic Systems Magazine, 2017
Implicitly or explicitly, the extraction of information from radar echoes is based on a physical model of the interaction between the radar system and the target, the study of which is sometimes referred to as radar phenomenology [1]. It follows that the detail and fidelity of the physical model determine the prospective observables, the accuracy of ...
openaire   +1 more source

Time-frequency analysis based image processing for maneuvering target detection in HF OTH radar

IET Conference Publications, 2009
In this paper an algorithm for maneuvering target detection in HF over-the-horizon radar is presented, which is based on the interpretation of the time-frequency map as an image. In the algorithm, radar signal is processed in joint time-frequency domain with short-time Fourier transform.
null Lei Zhiyong, null Huang Yinhe
openaire   +1 more source