| 摘 要: 传统声呐系统通常将全阵波束形成结果直接送显输出，且全阵波束处理往往未有效利用信号的相关性，针对此特点，本文结合平滑相干变换(Smoothed Coherence Transform，SCOT)处理原理，提出一种基于SCOT预白化处理的分裂孔径波束形成处理方法。该方法首先将阵列孔径一分为二，其次对两子孔径波束输出进行SCOT、互谱处理，最后获得最终的波束输出。与常规全阵波束处理方法相比，本文所提出的方法能有效抑制高噪声频率成分，同时提高目标的方位分辨能力。仿真结果表明，该方法能有效改善波束的输出效果。 |
| 关键词: SCOT；分裂孔径；噪声抑制；方位分辨 |
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中图分类号: TP391.7
文献标识码: A
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| A Split Aperture Beamforming Method based on Smooth Coherence Transformation |
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FAN Zeya, XU Yanan, CHEN Fuhu
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(Hangzhou Applied Acoustic Research Institute, Hangzhou 310012, China )
crazyfzy@126.com; xuyanan20009@126.com; cfh302@sina.com
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| Abstract: Traditional sonar systems tend to directly display and output to send the results of full-array beamforming. The full-array beam processing does not make effective use of signal correlation. In view of this feature, this paper proposes a split aperture beamforming processing method based on Smoothed Coherence Transform (SCOT) pre-whitening processing principles. This method first divides the array aperture into two, and then performs SCOT and cross-spectrum processing on the output of the two sub-aperture beams. Finally, it obtains the final beam output. Compared with the conventional full-array beam processing method, the method proposed in this paper can effectively suppress high-noise frequency components while improving the target's azimuth resolution ability. The simulation results show that this method can effectively improve the beam output effect. |
| Keywords: SCOT; split aperture; noise suppression; azimuth resolution |
