Results 151 to 160 of about 439 (181)
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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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Performance bounds for joint estimation of ionospheric and target parameters in MIMO-OTH radar
2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2014Ionospheric information is required when estimating target parameters in skywave over-the-horizon (OTH) radar. Unlike the traditional OTH radar which uses only the measurements of ionospheric parameters obtained from an ionosonde to estimate the target parameters, the multiple-input multiple-output skywave OTH (MIMO-OTH) radar studied in this paper ...
Mao Li, Qian He, Zishu He
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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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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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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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Modeling and performance of HF/OTH radar target classification systems
IEEE Transactions on Aerospace and Electronic Systems, 1992The 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 +3 more
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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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Consideration of reciprocal mixing in HF OTH radar design
7th International Conference on High Frequency Radio Systems and Techniques, 1997The 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 ...
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Design and implementation of a fully automated OTH radar tracking system
Proceedings International Radar Conference, 2002Detection and tracking systems for OTH radars typically require manual oversight because of clutter, noise, and propagation conditions. The authors have designed and constructed a tracking system that eliminates this intervention. The system is based on a two-stage approach that detects low-SNR tracks in the raw data without amplitude-based peak ...
S.W. Shaw, J.F. Arnold
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Ship target detection for HF groundwave shipborne OTH radar
IEE Proceedings - Radar, Sonar and Navigation, 1999The 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
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