Transient interference suppression for high‐frequency skywave over‐the‐horizon radar
| Autor: | Qinzhen Hu, Hongtao Su, Ziwei Liu |
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| Rok vydání: | 2016 |
| Předmět: |
Skywave
Engineering business.industry 0211 other engineering and technologies 020206 networking & telecommunications 02 engineering and technology Interference (wave propagation) law.invention Coherent processing interval Over-the-horizon radar law Cascade 0202 electrical engineering electronic engineering information engineering Electronic engineering Transient (oscillation) Electrical and Electronic Engineering Radar business Adaptive beamformer 021101 geological & geomatics engineering |
| Zdroj: | IET Radar, Sonar & Navigation. 10:1508-1515 |
| ISSN: | 1751-8792 |
| DOI: | 10.1049/iet-rsn.2015.0639 |
| Popis: | Skywave over-the-horizon radar (OTHR) plays an important role in the out-of-sight surveillance. However, the operational performance will severely degrade due to transient interferences. Previous works concentrate on time-domain methods to achieve transient interference suppression. However, time-domain methods are usually time-consuming and suffer performance loss when several discontinuous transient interference segments occupy parts of coherent processing interval. In fact, most transient interferences are spatially structured and can be cancelled at adaptive beamforming stage. In this study, the adaptive beamforming is adopted and a space-time cascade processing procedure is proposed for transient interference suppression. In the procedure, the sidelobe transient interferences are cancelled by adaptive beamforming and the mainlobe transient interferences are suppressed by a modified time-domain method. The proposed procedure is in accordance with the regular processing procedure of skywave OTHR and can provide reliable performance with small extra computational costs. The performance of the proposed procedure is evaluated using experimental data recorded by a trial skywave OTHR and the results verify the feasibility and effectiveness of the proposed procedure. |
| Databáze: | OpenAIRE |
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