长波对雷达后向散射强调制的波槽模拟

IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing Symposium (Cat. No.01CH37217) Pub Date : 2001-07-09 DOI:10.1109/IGARSS.2001.977057

S. Ermakov, I. Sergievskaya, Y. Shchegolkov, J. C. Scott, N. Stapleton

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摘要

在不同风速和风速下的波槽实验中，研究了ka波段雷达对长风波的后向散射调制。对调制传递函数(MTF)进行了分析，结果表明，与实验结果相比，倾斜调制、水动力应变和风应力调制机制严重低估了其作用。雷达多普勒频移测量表明，它们比与自由重力-毛细管布拉格波有关的大，比由分米尺度主导风波产生并以相速度传播的束缚波小。结果表明，由实测多普勒频移估计的束缚波在短风波谱中的贡献是显著的，因此这些波可以对雷达后向散射进行强调制。

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Wave tank modelling of strong modulation of radar backscatter due to long waves

Modulation of radar backscatter due to long wind waves for Ka-band radar has been studied in wave tank experiments at different wind velocities and fetches. The modulation transfer function (MTF) was analysed, and it is shown that the mechanisms of tilt modulation, hydrodynamic straining and modulation of wind stress strongly underestimate the effect when compared with experiment. Radar Doppler shifts were measured and they were shown to be larger than those, connected with free gravity-capillary Bragg waves, and smaller than for bound waves, generated by decimetre-scale dominant wind waves and propagating with their phase velocities. It is shown that the contribution of the bound waves in the short wind-wave spectrum, estimated from the measured Doppler shifts is significant so that these waves can give strong modulation of radar backscatter.

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IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing Symposium (Cat. No.01CH37217)

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