星载雷达波谱仪反演海浪谱的精度研究

林文明; 董晓龙

星载雷达波谱仪反演海浪谱的精度研究

林文明¹,
董晓龙²

1.
中国科学院空间科学与应用研究中心, 北京 100190; 中国科学院研究生院, 北京 100049
2.
中国科学院空间科学与应用研究中心, 北京 100190

基金项目: 国家高技术研究发展计划("八六三"计划)课题(2007AA12Z119)。

计量
- 文章访问数: 1605
- HTML全文浏览量: 8
- PDF下载量: 1665
- 被引次数: 0
出版历程
- 收稿日期: 2010-05-07

The resolution of ocean wave spectra retrieved by space-borne real aperture radar spectrometer

LIN Wen-ming¹,
DONG Xiao-long²

1.
Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China; Graduate School, Chinese Academy of Sciences, Beijing 100049, China
2.
Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China

摘要

摘要: 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,在数据处理过程中时域和波数域相邻单元的平均个数分别为10和8个。系统在不同的模式下工作,为了获取20°的角度分辨率,对调制谱平均次数分别取3次(模式1)、7次(模式2)、10次(模式3)。使用解析法和仿真法分析了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%。
- 雷达波谱仪 /
- 海浪谱 /
- 精度指标 /
- 能量误差
Abstract: The measurement principle of a space-borne real aperture radar spectrometer and the error analysis model are introdued. The analysis of the wavelength resolution and directional resolution is presented, based on the SWIM instrument, which is proposed by Hauser D et al. To reduce the fluctuation of retrieved spectra, it is proposed to average ten adjacent independent samples in the time domain and eight in the wavenumber domain, respectively, during the data processing. And for achieving the directional resolution better than 20°, the largest number of integrated subperiod is three, seven and ten for the instrument operated in three different modes, respectively. Two methods, namely, analytical process and simulation process, are adopted to analyze the energy error of retrieved wave spectra by SWIM operated at Mode 2. The results of the two methods are in agreement, which shows that the energy error is less than 20% for certain wave conditions.
- radar spectrometer /
- ocean wave spectra /
- resolution quality /
- energy error

HTML全文

参考文献(10)

HAUSER D, SOUSSI E, THOUVENOT E, et al. SWIMSAT: a real-aperture radar to measure directional spectra of ocean waves from space-main characteristics and performance simulation [J]. Journal of Atmospheric and Oceanic Technology, 2001, 18(3): 421—437.

ALPERS W R, ROSS D B, RUFENACH C L. On the detectability of ocean surface waves by real and synthetic aperture radar [J]. Journal of Geophysical Research, 1981, 86(C7): 6481—6498.

JACKSON F C, WALTON T W, BAKER P L. Aircraft and satellite measurement of ocean wave directional spectra using scanning beam microwave radars[J].Journal of Geophysical Research,1985,90 (C1):987—1004.

JACKSON F C,WALTON T W.A comparison of in situ and airborne radar observations of ocean wave directionality[J].Journal of Geophysical Research, 1985,90 (C1):1005—1018.

TISON C, AMIOT T, BOURBIER J, et al. Directional wave spectrum estimation by SWIM instrument on CFOSAT . Earth Observation- Origins to Applications: IGARSS'2009 Proceedings, Cape Town, 2009(V):312—315.

ENJOLRAS V, REY L, CROS L, et al. SWIM: a state of art multi-incidence beams Ku-band waves scatterometer to go beyond current radar systems . Earth Observation—Origins to Applications: IGARSS'2009 Proceedings, Cape Town, 2009(Ⅴ):316—319.

PIERSON W J, MOSKOWITZ L. A proposed spectral form for fully developed wind sea based on the similarity theory of S A Kitaigorodskii[J].Journal of Geophysical Research, 1964, 69(24):5181—5190.

DURDEN S L, VESECKY J F. A physical radar cross-section model for a wind-driven sea with swell[J].IEEE Journal of Oceanic Engineering,1985, 10(4):445—451.

文圣常,宇宙文.海浪理论与计算原理[M].北京: 科学出版社, 1984:142—194, 276—291.

LIN Wen-ming,DONG Xiao-long, ZHOU Yu-chi, et al. Simulation and optimization of the performance of space-borne radar ocean wave spectrometer . Earth Observation— Origins to Applications: IGARSS'2009 Proceedings Cape Town, 2009(III):793—796.

施引文献

资源附件(0)

访问统计