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海面风速微波散射测量与分析
逄爱梅, 孙元福
国家海洋局第一海洋研究所
摘要:
为了深入研究海面风的微波散射特性,利用海洋石油平台和飞机作为仪器的工作平台,对海面微波散射特性进行了测量,并应用统计分析方法,对测量数据作处理分析。结果表明,海面微波后向散射系数(σ°)值与海面风速成线性关系,随风速增大而增大。同时,σ°值与夹角及散射计天线入射角、极化方式有关。结合对海面微波散射算法中Phillips模式的分析比较,得到Phillips模式的计算值与实测值变化趋势一致的结果。
关键词:  海面风速,Phillips模式,测量与分析
DOI:10.11693/hyhz200201006006
分类号:
基金项目:国家航天办公室资助卫星应用重点技术研究项目,A101号
MEASUREMENTS AND ANALYSES OF MICROWAVE SCATTERING OF THE WIND SPEEDS ON SEA SURFACE
PANG Ai-Mei, SUN Yuan-Fu
First Institute of Oceanography,State Oceanic Administration
Abstract:
The microwave scattering properties of sea surface were measured with a microwave scatterometer on the platform in a sea and an airplane.The measured data were processed and analyzed with statistical and analytical methods.The Model RS-2 scatterometer with a frequency of 10.0GHz was used on the sea platform,and the Model LS-JX scatterometer with the 9.7GHz frequency was used in the air- plane.In the procedure of scattering properties, the marine environment parameters of wind speed, and direction,wave height,and direction,and sea surface temperature etc.were measured synchronously.At the same time,the changes in the antenna incident angle,polarized properties and the angles between the incident direction of scatterometer beam and wind direction were measured.The relationship of the microwave backscattering coefficients (σ°)with wind speeds was examined,and the changes of incident angles, polarized and the included angles between the incident direction of scatterometer beam and wind direction to the effects of backscattering coefficients (σ°) were examined.The results show that there are linear relationships between the measured σ°values and sea surface wind speeds, with the measured σ° values increasing with an increase in wind speeds; there are close relationships between the measuredσ°values and the antenna incident angles of the scatterometer, and the measured σ°values decrease with the increase in the antenna incident angles. The measured σ°values show periodic variations with the angles between the incident direction of scatterometer beam and wind direction with changes between 0°—360°.There is a relationship between the measured σ°values and the polarized properties of the scatterometer antenna.The measuredσ°values of vertical polarization are larger than the measured σ°values of horizontal polarization.At the same time, and in combination with Pillips Model of the microwave scattering measurement algorithm on sea surface, the relationship of the measured values and calculated values were analyzed comparably, with the results being highly similar.
Key words:  Sea surface wind speed, Phillips Model, Measurements and analyses
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