%0 Journal Article
%T Investigation on Doppler spectra of microwave scattering from sea surface<br>海面微波散射场多普勒谱特性研究
%A Jiang Wen-Zheng
%A Yuan Ye-Li
%A Wang Yun-Hua
%A Zhang Yan-Min
%A <br>姜文正
%A 袁业立
%A 王运华
%A 张彦敏
%J 物理学报
%D 2012
%I 
%X Based on the composite surface scattering model, the analytical formulas for Doppler shift and bandwidth of radar echoes return from time-varying sea surface are derived. In our derivations, the influences of the tilt modulation, the shadow and the curvature of large-scale undulating waves are all taken into account for achieving more reasonable results. Comparisons between the theoretical results and direct numerical simulations demonstrate that the analytical formulas can significantly improve the simulated results. And the effects of the tilt modulation, the shadow and the curvature on Doppler spectral properties are discussed in detail. From the simulated results, it is found that the predicted Doppler shifts are always larger in HH-polarization than in VV-polarization due to the tilt modulation of large-scale waves. In addition, at low-grazing angles, the shadow of large-scale waves results in a rapid increase of the predicted Doppler shift, and on the contrary maks the bandwidth narrower.
%K time-varying sea surface
%K electromagnetic scattering
%K Doppler spectra<br>动态海面
%K 电磁散射
%K 多普勒谱
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=78F360FC29C47911A0BD895990DBAF62&yid=99E9153A83D4CB11&vid=1D0FA33DA02ABACD&iid=59906B3B2830C2C5&sid=7A115CDF5AD2062D&eid=7A115CDF5AD2062D&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=22