| 1 | MIMO SAR Waveform Separation Based on Costas-LFM Signal and Co-arrays for Maritime Surveillance显示文摘In case of bright targets over a dark background, the cross-correlation noise of Multiple input and multiple output(MIMO) Synthetic aperture radar(SAR) orthogonal waveforms in the same frequency coverage will increase which can degrade the image. An Interpulse Costas hopping and intra-pulse Slope coded linearly frequency modulated(IPC-SCLFM) waveform is designed and analyzed to decrease the autocorrelation and cross-correlation noise. Besides a novel acquisition mode of 'MIMO Coprime SAR'(MIMO-Cop SAR) is proposed with Coprime arrays(Co-arrays) in receive across the SAR line of flight based on digital beamforming. An improved processing by multiplying values at each pixel of two coarrays images is proposed to suppress the cross-correlation noise. MIMO-Cop SAR can effectively suppress the crosscorrelation noise, reduce the amount of data to be stored and get high signal-to-noise ratio in a simple way. The effectiveness of MIMO-Cop SAR for maritime surveillance is demonstrated by the simulation experiments. | LIU Feng MU Shanxiang LYU Wanghan LI Wenliang GE Ting | 2017 | Chinese Journal of Electronics2017，26，1： | 5 |
| 4 | Short-time maritime target detection based on polarization scattering characteristics显示文摘In this paper,a detection method combining Cameron decomposition based on polarization scattering characteristics in sea clutter background is proposed.Firstly,the Cameron decomposition is exploited to fuse the radar echoes of full polarization channels at the data level.Due to the artificial material structure on the surface of the target,it can be shown that the non-reciprocity of the target cell is stronger than that of the clutter cell.Then,based on the analysis of the decomposition results,a new feature with scattering geometry characteristics in polarization domain,denoted as Cameron polarization decomposition scattering weight(CPD-SW),is extracted as the test statistic,which can achieve more detailed descriptions of the clutter scattering characteristics utilizing the difference between their scattering types.Finally,the superiority of the proposed CPD-SW detector over traditional detectors in improving detection performance is verified by the IPIX measured dataset,which has strong stability under short-time observation in threshold detection and can also improve the separability of feature space zin anomaly detection. | CHEN Shichao LUO Feng TIAN Min LYU Wanghan | 2024 | Journal of Systems Engineering and Electronics2024，35，1： | 0 |
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