楊東凱; 劉毅; 王峰

doi:10.11999/JEIT170490

星載GNSS-R海面風(fēng)速反演方法研究

doi: 10.11999/JEIT170490

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出版歷程
- 收稿日期: 2017-05-22
- 修回日期: 2017-10-06
- 刊出日期: 2018-02-19

Ocean Surface Wind Speed Retrieval Using Spaceborne GNSS-R

摘要

摘要: 星載GNSS-R因其時(shí)延-多普勒相關(guān)功率(DDM)波形對(duì)風(fēng)速的敏感性較低，采用理論與實(shí)測(cè)波形匹配的方法所得風(fēng)速精度較差。針對(duì)這一問題，該文采用一種直接建立相關(guān)功率值與風(fēng)速之間聯(lián)系的方法獲取風(fēng)速信息。基于相關(guān)功率模型對(duì)散射功率進(jìn)行了歸一化修正及其簡(jiǎn)化處理，利用UK TDS-1衛(wèi)星試驗(yàn)數(shù)據(jù)和散射計(jì)(ASCAT)同比觀測(cè)風(fēng)速分別建立歸一化散射功率及其簡(jiǎn)化式與海面風(fēng)速之間的經(jīng)驗(yàn)?zāi)Ｐ?。與ASCAT觀測(cè)風(fēng)速對(duì)比結(jié)果表明：在0~20 m/s的風(fēng)速范圍內(nèi)，采用歸一化散射功率反演風(fēng)速的均方根誤差為2.11 m/s；兩種方法的反演精度相近，簡(jiǎn)化修正方式避免了復(fù)雜的積分運(yùn)算更適用于實(shí)時(shí)處理。
- 星載GNSS-R /
- 海面風(fēng)速 /
- TDS-1 /
- 經(jīng)驗(yàn)?zāi)Ｐ?/a>
Abstract: For spaceborne GNSS-R, Delay-Doppler Map (DDM) shape is less sensitive to wind speed, resulting in poor retrieval accuracy measured by fitting theoretical DDM to the measured one. To solve this problem, a method directly linking the individual DDM power measurement to wind speed is developed to obtain wind speed. Scattered power is normalized by correction factor and its simplified form based on Zavorotny-Voronovich (Z-V) model, respectively. Empirical geophysical model functions linking both normalized scattered power and its simplified form to ocean surface wind speed are derived using spaceborne data on UK TechDemoSat-1 (TDS-1) together with in-situ Advanced Scatterometer (ASCAT) wind measurements. The Root-Mean-Square Error (RMSE) of wind speeds retrieved utilizing normalized scattered power is 2.11 m/s at 0~20 m/s. Simplified normalized scattered power by which wind speed accuracy retrieved is the same level with normalized scattered power is more suitable for real-time processing on-board.

Key words:
Spaceborne GNSS-R /

Ocean surface wind speed /

TDS-1 /

Empirical model

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