Polarimetric airborne scientific instrument, mark 2, an ice-sounding airborne synthetic aperture radar for subglacial 3D imagery
Polarimetric airborne scientific instrument, mark 2, an ice-sounding airborne synthetic aperture radar for subglacial 3D imagery
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偏振机载科学仪器 Mark 2，一种用于冰下 3D 图像的冰探机载合成孔径雷达
DOI：
10.1049/rsn2.12428
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Arenas-Pingarrón Á
中科院分区：
文献类型：
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作者：
Arenas-Pingarrón Á
极化机载科学仪器2号（PASIN2）是一种150兆赫相干脉冲雷达，用于南极基岩、冰下通道和冰-水界面探测的深冰探测。它由英国南极调查局从2014年开始设计和运营。通过多个天线，沿轨道和跨轨道定向，用于传输和接收，它可以通过一次通道对冰基地进行偏振3D估计，减少了调查路径的网格密度。离线数据处理流包括通道校准；基于后向投影的二维合成孔径雷达（SAR）成像，用于沿轨迹和范围尺寸；最后，通过修改非线性MUSIC算法，对剩余横航迹角进行到达方向估计（DoA）。在16/17和19/20季节的南极夏季活动期间，校准飞行评估和验证了仪器和处理性能。在靠近接地线的冰流和冰架上成像飞行展示了3D传感能力。通过解决方向模糊性和考虑反射器跨轨道位置，获得了真实的冰厚和床高程，从而消除了通常假设的垂直方位的误差，这极大地影响了冰动力学流动模型的输出。
Polarimetric Airborne Scientific INstrument, mark 2 (PASIN2) is a 150 MHz coherent pulsed radar with the purpose of deep ice sounding for bedrock, subglacial channels and ice‐water interface detection in Antarctica. It is designed and operated by the British Antarctic Survey from 2014. With multiple antennas, oriented along and across‐track, for transmission and reception, it enables polarimetric 3D estimation of the ice base with a single pass, reducing the gridding density of the survey paths. The off‐line data processing stream consists of channel calibration; 2D synthetic aperture radar (SAR) imaging based on back‐projection, for along‐track and range dimensions; and finally, a direction of arrival estimation (DoA) of the remaining across‐track angle, by modifying the non‐linear MUSIC algorithm. Calibration flights, during the Antarctic Summer campaigns in 16/17 and 19/20 seasons, assessed and validated the instrument and processing performances. Imaging flights over ice streams and ice shelves close to grounding lines demonstrate the 3D sensing capabilities. By resolving directional ambiguities and accounting for reflector across‐track location, the true ice thickness and bed elevation are obtained, thereby removing the error of the usual assumption of vertical DoA, that greatly influence the output of flow models of ice dynamics.