Sea surface topography retrieved from GNSS reflectometry phase data of the GEOHALO flight mission

Sea surface topography retrieved from GNSS reflectometry phase data of the GEOHALO flight mission
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从 GEOHALO 飞行任务的 GNSS 反射计相位数据中检索到的海面地形

DOI:
10.1002/2013gl058725
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发表时间:
2014
影响因子:
5.2
通讯作者:
Scheinert
Scheinert
中科院分区:
地球科学1区
文献类型:
--
作者:
Semmling;Beckheinrich;Wickert;Beyerle;Schön;Pflug;Schwabe;Scheinert

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海面地形观测是由机载反射测量实验推导出来的。在德国HALO(高空远程)研究飞机上安装了一个全球导航卫星系统(GNSS)反射计专用接收器。飞行在地中海上空进行,海拔约3500米。信号路径模型分为大尺度和小尺度的贡献是用于相位测高。结果描绘大地水准面起伏和解决异常的海面地形。在整个实验中,65个轨道在地中海检索和地形模型进行比较。右旋和左旋圆极化的轨迹不同。然而,这种差异在这项研究中并不显著。精度和空间分辨率在低海拔地区不成比例地下降。在仰角11°至33°之间获得了8条厘米精度的航迹。在更高的仰角,轨道的数量由于表面粗糙度而显著减少。在未来,这种检索可能有助于海洋涡流探测。
Sea surface topography observations are deduced from an airborne reflectometry experiment. A GNSS (Global Navigation Satellite System) receiver dedicated for reflectometry was set up aboard the German HALO (High Altitude Long Range) research aircraft. Flights were conducted over the Mediterranean Sea about 3500 m above sea level. A signal path model divided into large‐ and small‐scale contributions is used for phase altimetry. The results depict geoid undulations and resolve anomalies of the sea surface topography. For the whole experiment 65 tracks over the Mediterranean Sea are retrieved and compared with a topography model. Tracks differ between right‐handed and left‐handed circular polarization. The difference, however, is not significant for this study. Precision and spatial resolution decrease disproportionately at low elevations. Eight tracks with centimeter precision are obtained between 11° and 33° of elevation. At higher elevation angles the number of tracks is significantly reduced due to surface roughness. In future such retrievals could contribute to ocean eddy detection.
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