A Cascaded Approach for Correcting Ionospheric Contamination with Large Amplitude in HF Skywave Radars
Ionospheric phase perturbation with large amplitude causes broadening sea clutter’s Bragg peaks to overlap each other; the performance of traditional decontamination methods about filtering Bragg peak is poor, which greatly limits the detection performance of HF skywave radars. In view of the ionosp...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/693872 |
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| author | Yajun Li Yinsheng Wei Rujiang Guo Rongqing Xu Zhuoqun Wang Xiudong Tang |
| author_facet | Yajun Li Yinsheng Wei Rujiang Guo Rongqing Xu Zhuoqun Wang Xiudong Tang |
| author_sort | Yajun Li |
| collection | DOAJ |
| description | Ionospheric phase perturbation with large amplitude causes broadening sea clutter’s Bragg peaks to overlap each other; the performance of traditional decontamination methods about filtering Bragg peak is poor, which greatly limits the detection performance of HF skywave radars. In view of the ionospheric phase perturbation with large amplitude, this paper proposes a cascaded approach based on improved S-method to correct the ionospheric phase contamination. This approach consists of two correction steps. At the first step, a time-frequency distribution method based on improved S-method is adopted and an optimal detection method is designed to obtain a coarse ionospheric modulation estimation from the time-frequency distribution. At the second correction step, based on the phase gradient algorithm (PGA) is exploited to eliminate the residual contamination. Finally, use the measured data to verify the effectiveness of the method. Simulation results show the time-frequency resolution of this method is high and is not affected by the interference of the cross term; ionospheric phase perturbation with large amplitude can be corrected in low signal-to-noise (SNR); such a cascade correction method has a good effect. |
| format | Article |
| id | doaj-art-2eae56df64d84e0e81fc5ee3425ecba6 |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-2eae56df64d84e0e81fc5ee3425ecba62025-08-20T03:55:07ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/693872693872A Cascaded Approach for Correcting Ionospheric Contamination with Large Amplitude in HF Skywave RadarsYajun Li0Yinsheng Wei1Rujiang Guo2Rongqing Xu3Zhuoqun Wang4Xiudong Tang5School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, ChinaIonospheric phase perturbation with large amplitude causes broadening sea clutter’s Bragg peaks to overlap each other; the performance of traditional decontamination methods about filtering Bragg peak is poor, which greatly limits the detection performance of HF skywave radars. In view of the ionospheric phase perturbation with large amplitude, this paper proposes a cascaded approach based on improved S-method to correct the ionospheric phase contamination. This approach consists of two correction steps. At the first step, a time-frequency distribution method based on improved S-method is adopted and an optimal detection method is designed to obtain a coarse ionospheric modulation estimation from the time-frequency distribution. At the second correction step, based on the phase gradient algorithm (PGA) is exploited to eliminate the residual contamination. Finally, use the measured data to verify the effectiveness of the method. Simulation results show the time-frequency resolution of this method is high and is not affected by the interference of the cross term; ionospheric phase perturbation with large amplitude can be corrected in low signal-to-noise (SNR); such a cascade correction method has a good effect.http://dx.doi.org/10.1155/2014/693872 |
| spellingShingle | Yajun Li Yinsheng Wei Rujiang Guo Rongqing Xu Zhuoqun Wang Xiudong Tang A Cascaded Approach for Correcting Ionospheric Contamination with Large Amplitude in HF Skywave Radars The Scientific World Journal |
| title | A Cascaded Approach for Correcting Ionospheric Contamination with Large Amplitude in HF Skywave Radars |
| title_full | A Cascaded Approach for Correcting Ionospheric Contamination with Large Amplitude in HF Skywave Radars |
| title_fullStr | A Cascaded Approach for Correcting Ionospheric Contamination with Large Amplitude in HF Skywave Radars |
| title_full_unstemmed | A Cascaded Approach for Correcting Ionospheric Contamination with Large Amplitude in HF Skywave Radars |
| title_short | A Cascaded Approach for Correcting Ionospheric Contamination with Large Amplitude in HF Skywave Radars |
| title_sort | cascaded approach for correcting ionospheric contamination with large amplitude in hf skywave radars |
| url | http://dx.doi.org/10.1155/2014/693872 |
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