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星载雷达波谱仪反演海浪谱的精度研究
Resolution of Ocean Wave Spectra Retrieval by Space-borne Real Aperture Radar Spectrometer
投稿时间:2010-05-07  修订日期:2010-07-22
DOI:
中文关键词:  雷达波谱仪  海浪谱  精度指标  能量误差
英文关键词:Radar spectrometer  Ocean wave spectra  Resolution quality  Energy error
基金项目:国家高技术研究发展计划(863计划);中国科学院重大资助项目
作者单位邮编
林文明* 中国科学院空间科学与应用研究中心 100190
董晓龙中国科学院空间科学与应用研究中心 
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中文摘要:
      本文介绍了星载雷达波谱仪的观测原理及误差分析模型,并在Hauser等人提出的SWIM(Sea Wave Investigation and Monitoring by satellite)的基础上分析了波谱仪反演海浪谱的波长分辨率和角度分辨率。为了减小反演调制谱的波动,在数据处理过程,时域和波数域相邻单元的平均个数分别为10个和8个。系统工作在不同的模式,为了获取20的角度分辨率,调制谱平均次数分别为3次(模式1)、7次(模式2)、10次(模式3)。文中采用解析法和仿真法两种方法分析了SWIM工作在模式2时海浪谱观测的能量误差,两种方法的结果一致。对于给定的海浪条件,能量误差小于20%。
英文摘要:
      This paper introduces the measurements principle of a space-borne real-aperture radar spectrometer as well as the error analysis model. Then analysis of the wavelength resolution and directional resolution is presented, based on the SWIM instrument, which is proposed by Hauser, et al [1]. To reduce the fluctuation of retrieved spectra, it is proposed to average 10 adjacent independent samples in time domain and eight in wave-number domain, respectively, during the data processing. And for achieving a directional resolution better than 20, the largest number of integrated sub-period is 3, 7 and 10 for the instrument operated in 3 different modes, respectively. Finally, two methods, namely analytical process and simulation process, are adopted to analyze the energy error of retrieved wave spectra by SWIM operated at Mode Two. Results of the two methods are in agreement, which show that the energy error is less than 20% for certain wave conditions.
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