Ice Sheet Bed Mapping With Airborne SAR Tomography
Ice Sheet Bed Mapping With Airborne SAR Tomography
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DOI：
10.1109/tgrs.2011.2132802
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发表时间：
2011-05
影响因子：
8.2
通讯作者：
Xiaoqing Wu;K. Jezek;E. Rodríguez;S. Gogineni;F. Rodríguez‐Morales;A. Freeman
中科院分区：
文献类型：
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作者：
Xiaoqing Wu;K. Jezek;E. Rodríguez;S. Gogineni;F. Rodríguez‐Morales;A. Freeman
我们开发并演示了一种应用于甚高频(VHF)雷达数据的三维层析冰探测方法，该方法产生冰盖表面地形、冰厚度以及冰盖表面和冰床的雷达反射率的条带测量。首先，我们将冰盖成像问题描述为一个估计信号到达角的问题，并说明了该方法是如何解决从飞机左右两侧以及从冰盖表面和底部同时到达的模糊回波的。然后，我们讨论了为什么我们选择时间域子孔径方法来进行冰层探测的二维成像。我们将层析成像技术应用于我们在2006年5月和2008年7月从多相中心甚高频雷达系统收集的数据。我们提供了冰盖上表面和下表面的三维图像，并将估计的表面地形与冰、云和陆地海拔卫星高度计最低点轨道的测量结果以及测量的带状冰厚度与独立的最低点深度探测仪轨道进行了比较。我们实现了5米的表面地形精度和14米的冰层厚度精度。
We develop and then demonstrate a 3-D tomographic ice sounding method applied to very high frequency (VHF) radar data that produces swath measurements of ice sheet surface topography, ice thickness, and radar reflectivity of both the surface and bed of the ice sheet. First, we formulate the ice sheet imaging problem as a problem of estimating signal arrival angles and illustrate how the method resolves ambiguous echoes arriving simultaneously from the left and right sides of the aircraft, as well as from the surface and base of the ice sheet. We then discuss why we chose the time-domain subaperture method for 2-D image formation for ice sounding. We apply the tomographic technique to the data that we collected in May 2006 and again in July 2008 from a multiple-phase-center VHF radar system. We present 3-D images of the upper and lower surfaces of the ice sheet and compare the estimated surface topography with Ice, Cloud, and land Elevation Satellite altimeter nadir track measurements and the measured swath ice thickness with independent nadir depth sounder tracks. We achieved a 5-m surface topography accuracy and a 14-m ice thickness accuracy.