| 摘要: |
| 船载高频地波雷达凭借其平台机动灵活、可扩展探测区域的优点，已成为大范围、远距离海上船只目标的有效探测手段。然而，受船载平台运动的影响，地波雷达回波中的地杂波（包含陆地杂波和岛屿杂波）会产生额外的多普勒频移，在距离-多普勒回波谱上形成大面积杂波，并与船只目标回波混杂，这严重影响了船载地波雷达的船只探测性能。针对船载地波雷达船只目标回波与地杂波混杂的问题，本文提出了一种地杂波和船只目标回波分离方法。该方法首先结合地理信息和船载平台姿态信息估计和提取陆地杂波；然后利用船只目标回波和岛屿杂波多普勒频移和幅度特性的差异，对其进行分离；最后基于静止目标（包含静止船只和岛屿）方位角与回波多普勒频移之间的关系，对其进行方位角估计和地理位置定位。利用船载地波雷达实测数据和AIS数据对方法的有效性进行了验证，实验结果证明，该方法可实现地杂波和船只目标回波的分离。 |
| 关键词: 船载地波雷达 地杂波 船只目标回波 多普勒频移 目标回波幅度 |
| DOI： |
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| 基金项目:国家自然科学基金项目（62031015和62271507）；山东省自然科学基金(ZR2022MF235) |
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| Separation of Vessel Target Echoes from Ground Clutter for Shipborne HFSWR |
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Zhang hao1, Ji yonggang1, Wang yiming2, Meng junmin2, Qu ruozhao1, Li farui1, Jiang menghua1
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1.China University of Petroleum(East China);2.First Institute of Oceanography, Ministry of Natural Resources
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| Abstract: |
| Shipborne high-frequency surface-wave radar (HFSWR) has emerged as an effective tool for detecting wide-range and long-distance marine vessel targets due to the mobility and flexibility of the shipborne platform. However, due to the motion of the shipborne platform, the ground clutter (including land clutter and island clutter) will produce extra Doppler shift, forms a large area of clutter in the range-Doppler echo spectrum, and mix with the vessel target echoes, which seriously affects the vessel target detection performance of shipborne HFSWR. Aiming at the problem of vessel target echoes mixing with ground clutter in shipborne HFSWR, this paper proposes a separation method between ground clutter and vessel target echoes. The method first estimates and extracts the land clutter by combining geographic information and attitude information of the shipborne platform; then separates the vessel target echoes and island clutter by utilizing the differences in Doppler shift and amplitude characteristics; and finally based on the relationship between the azimuth of stationary targets (including stationary vessels and islands) and Doppler shift, the azimuth estimations and geographical locations of stationary targets are carried out. The effectiveness of the proposed method is verified by using the measured data of shipborne HFSWR and AIS data. The experimental results show that the proposed method can realize the separation of ground clutter and vessel target echoes. |
| Key words: Shipborne HFSWR Ground clutter Vessel target echo Doppler shift Amplitude of target echo |