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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing. >Surface Echo Characteristics Derived From the Wide Swath Experiment of the Precipitation Radar Onboard TRMM Satellite During Its End-of-Mission Operation
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Surface Echo Characteristics Derived From the Wide Swath Experiment of the Precipitation Radar Onboard TRMM Satellite During Its End-of-Mission Operation

机译：表面回波特性是由TRMM卫星在其任务结束操作期间的宽幅实验得出的

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摘要

The purpose of this paper is to assess the height and strength of the surface echo clutter from the wide swath operation of a future spaceborne precipitation radar (PR) using the wide swath observation data during the end-of-mission experiment of the PR onboard the Tropical Rainfall Measuring Mission (TRMM) satellite. In this experiment, the maximum incident angle was expanded up to 32.5° from nadir, while the maximum incident angle is 18° for normal observation of the TRMM/PR. Although the results show that the clutter height monotonically increases with the incident angle as expected, the clutter height is suppressed for wide angles because of the weakening of the surface echo strength. As a result, the clutter height is less than 2 km if the rain echo is 15 dB higher than the noise level (i.e., about 34 dBZ echo for the TRMM/PR). The clutter height and the normalized backscattering cross section ( σ0 ) are compared between ocean and land. Suppression of the clutter height is significant over ocean because of the relatively smaller σ0 (smoother surface) and flat surface (no topography). The impact of the σ0 for wide swath observation on the rain retrieval algorithm, especially on the surface reference technique, is also examined. The operation with a swath width almost twice the current TRMM/PR is achievable if relatively intense echoes are targeted; however, relatively weak and shallow precipitation will be masked by the clutter.
机译：本文的目的是使用PR的机载末期实验期间的宽幅观测数据来评估未来星载降水雷达（PR）的宽幅运行产生的表面回波杂波的高度和强度。热带降雨测量任务（TRMM）卫星。在该实验中，最大入射角从最低点扩大到32.5°，而正常观察TRMM / PR的最大入射角为18°。尽管结果表明杂波高度随入射角单调增加，但由于表面回波强度减弱，杂波高度在广角下得到了抑制。结果，如果雨水回波比噪声水平高15 dB（即TRMM / PR的回波约为34 dBZ），则杂波高度小于2 km。比较了海洋和陆地之间的杂波高度和归一化后向散射截面（σ0）。由于σ0（平滑的表面）和平坦的表面（无地形）相对较小，因此在整个海洋中，杂波高度的抑制非常重要。还研究了用于宽幅观测的σ0对降雨检索算法（特别是对表面参考技术）的影响。如果瞄准相对强烈的回波，则可以实现几乎是当前TRMM / PR两倍的扫描宽度的操作；但是，相对较弱和较浅的降水将被杂波掩盖。

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