Results 131 to 140 of about 439 (181)

Performance of OTH radar array calibration

Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181), 2002
Array calibration algorithms for over-the-horizon (OTH) radar arrays have been proposed in the literature. These algorithms perform array calibration by using echoes from ionised meteor trails, and estimate sensor position errors and mutual coupling. We derive the Cramer-Rao performance bound for this array calibration problem and then investigate the ...
I. S. D. Solomon, Yuri I. Abramovich, Douglas A. Gray 0001, Stuart J. Anderson   +3 more
openaire   +1 more source

Sources for OTH radar array calibration

IEEE Antennas and Propagation Society International Symposium 1997. Digest, 2002
Modern over-the-horizon (OTH) radars currently being developed for coastal surveillance incorporate antenna arrays which are to be erected quickly with minimal site preparation. For such arrays, array calibration is necessary. Meteors, noise sources and beacons (special sources) may be used for calibrating these OTH radars.
I.S.D. Solomon, D.A. Gray, Yu.I. Abramovich   +2 more
openaire   +1 more source

Exterior noise adaptive rejection for OTH radar implementations

Proceedings of ICASSP '94. IEEE International Conference on Acoustics, Speech and Signal Processing, 2002
A new class of nonstationary adaptive techniques is proposed to put up with clutter distortions originated from the current pattern readjustment, caused by the temporal perturbations of the jammer spatial covariance matrix. To introduce this approach we describe, by using the scalar-type vector-valued autoregressive model the inter-repetition sequence ...
Yuri I. Abramovich, Alexei Gorokhov, V. N. Mikhaylyukov, I. P. Malyavin   +3 more
openaire   +1 more source

On model identification for distortion correction of OTH radar signals

Proceedings of ICASSP '94. IEEE International Conference on Acoustics, Speech and Signal Processing, 2002
When 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.
Stuart J. Anderson, Susan E. Godfrey, S. M. Voigt   +2 more
openaire   +1 more source

Spatial adaptive subspace detection in OTH radar

IEEE Transactions on Aerospace and Electronic Systems, 2003
The work presented here addresses the problem of target detection against spatially structured interference composed of jamming plus noise, where for practical reasons, the received target wavefront may also deviate from the traditional plane wave model.
G.A. Fabrizio, A. Farina, A. Marconi, M.D. Turley   +3 more
openaire   +1 more source

Signal processing of sky wave OTH-B radar

Proceedings of ICASSP '94. IEEE International Conference on Acoustics, Speech and Signal Processing, 2002
The design technique of signal processing of sky wave OTH-B radar is presented as well as 3D treatments in space, time and frequency domains and their performances. The technical insurance of a bistatic synchronization system and the characteristic of signal processing when detecting ship targets are reported briefly. The performances of a subarray are
Wenyu Zhou, Peinan Jiao
openaire   +1 more source

Knowledge-based signal processing in OTH radar

Proceedings of 2011 IEEE CIE International Conference on Radar, 2011
This paper is concerned with knowledge-based processing technique in high-frequency over the horizon radar (OTHR) to improve radar performance. Knowledge-based processing technique is proposed to increase target detection probability, reduce false alarm in heavy clutter, correct target measurement error and assess battlefield situation.
null Lei Zhiyong, null Ni Jin
openaire   +1 more source

Detection Performance of MIMO-OTH Radar: Advantages of Multipath Ionospheric Propagation

2012 IEEE 12th International Conference on Computer and Information Technology, 2012
Multipath ionospheric propagation (MIP), a typical phenomenon the sky wave over-the-horizon (OTH) radar may encounter, is often viewed as an annoying factor to be eliminated in the traditional OTH radars. In this paper, we consider multiple-input multiple-output sky wave over-the-horizon (MIMO-OTH) radar with closely spaced antennas.
Qian He, Zishu He
exaly   +2 more sources

Traveling Ionospheric Disturbance Mitigation for OTH Radar

2007 IEEE Radar Conference, 2007
Deflection of HF propagation paths by traveling ionospheric disturbances (TIDs) remains a troubling cause of coordinate registration errors for over-the-horizon (OTH) radar. Bandwidth and coverage limitations in ionospheric soundings preclude the ability to model TID structure in real time in most cases.
L. J. Nickisch, Mark A. Hausman, Sergey Fridman   +2 more
openaire   +1 more source

Application of superresolution techniques to the ground OTH radar

Proceedings of National Aerospace and Electronics Conference (NAECON'94), 2002
The 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
openaire   +1 more source