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A Simultaneous Imaging Scheme of Stationary Clutter and Moving Targets for Maritime Scenarios with the First Chinese Dual-Channel Spaceborne SAR Sensor

机译：具有第一中国双通道星载SAR传感器的静止杂波和移动目标的同时成像方案

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摘要

The technique of azimuth multichannel synthetic aperture radar (SAR) system has become a potential solution to the irreconcilable conflict between high-resolution and wide-swath (HRWS) confronted with in a traditional SAR system. Unambiguous imaging, especially for a scene with moving targets, is one of the crucial research topics in the HRWS SAR system. This paper proposes a simultaneous imaging scheme of moving targets and stationary clutter for maritime scenarios. First, the moving target echoes are extracted from the stationary clutter. After that, two methods working in completely different principles are used to estimate the radial velocity of each moving target, and the estimated result is used for phase compensation. After that, the moving target echoes are added back to the stationary scene echo and sent to the reconstruction filter. Lastly, the reconstructed echo can be processed by the classical Chirp Scaling (CS) algorithm. Experiments are carried out using the Chinese GaoFen-3 dual-channel data. The estimated velocities of the moving targets are verified by automatic identification service (AIS) information, and the imaging results show that the false targets are effectively suppressed and the moving targets also return to their correct positions along the azimuth.
机译：方位角多通道合成孔径雷达（SAR）系统的技术已成为在传统的SAR系统中面对的高分辨率和宽血管（HRW）之间的不可调配冲突的潜在解决方案。明确的成像，特别是对于具有移动目标的场景，是HRWS SAR系统中的重要研究主题之一。本文提出了一种同时成像的移动目标和静止杂波的海事场景。首先，从静止杂波中提取移动目标回波。之后，使用完全不同原理的两种方法用于估计每个移动目标的径向速度，并且估计结果用于相位补偿。之后，将移动的目标回波被添加回到静止场景回波并发送到重建滤波器。最后，可以通过经典Chirp缩放（CS）算法来处理重建的回声。使用中国高芬-3双通道数据进行实验。通过自动识别服务（AIS）信息验证移动目标的估计速度，并且成像结果表明有效地抑制了假目标，并且移动目标也沿方位角返回其正确位置。

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