岸基C波段和X波段雷达观测海面后向散射系数  

Land-based measurements of ocean C-band and X-band redar backscattering coefficient

作　　者：洪鹰[1] 孙瀛[1] 罗邦煦 白桂欣 郑淑卿[1] 

机构地区：[1]国家海洋局第三海洋研究所,厦门361005

出　　处：《台湾海峡》1995年第2期187-194,共8页Journal of Oceanography In Taiwan Strait

基　　金：国家航天办公室资助

摘　　要：本文给出了1992年4月中旬在浙江宁波北仑港进行的岸基X波段及C波段观测海面雷达后向散射系数σ°现场实验的部分结果，并对σ°、入射角θ、风速U及相对方位角X的关系作了讨论。实验表明，当风速在2．2～11．5m／s时，对于HH、VV及HV极化：（1）当20°≤θ＜65°时，对于X波段和C波段，σ°和exp（θ／θ。）成正比，且θ。在5°～8°之间；（2）对于X波段，当θ≤65°时。σ°比于Ur，在45°入射角VV极化时，r＝1．49；（3）σ°在逆风时接近最大，在侧风时接近最小。Results of a field experiment measuring ocean radar baekscattering coefficient σ°,which was conducted at the Beilun port by land-based X-band and C-band scatterometers in the April, 1992,are presented in this paper. Analysis are made from the dataset obtained on the relationships of σ° with incidence angle θ,windspeed U and relative azimuth X respect1vely.We conclude that,in the windspeed range of 2. 2 m/s to 11. 5m/s,and for the polarization of HH, VV,and HV: (1)for both-X band and C-band measurements,σ° is proportional to exp (θ/θ0) when θ is in the range of 20° to 65°,in which θ0 is a constant between 5° and 8°; (2) for X band and θ≤65°,σ° can be expressed as σ°=C1Ur,especially,the index r is equal to 1. 49 for VV porlarization and 45° incidence angle; (3) σ° approachs maximum at upwind direction and minimum at crosswind direction. Comparisons with other similar experiments abroad show a preliminary success of the present experiment. In additon,This paper gives a brief review on the history of the development of wind-measuring technology by scatterometer,points out some problems existing at present and puts forward some suggestions for this kind of experi ments in the future.

关 键 词：海面风场 散射计 模型函数 海面 雷达观测 

分 类 号：P732.1[天文地球—海洋科学]