文化大學機構典藏 CCUR:Item 987654321/36016
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    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://irlib.pccu.edu.tw/handle/987654321/36016


    题名: Cross Spectral Analysis of CODAR-SeaSonde Echoes from Sea Surface and Ionosphere at Taiwan
    作者: Wang, CY (Wang, Chien-Ya)
    Su, CL (Su, Ching-Lun)
    Wu, KH (Wu, Kang-Hung)
    Chu, YH (Chu, Yen-Hsyang)
    贡献者: 物理系
    关键词: SPORADIC-E LAYER
    RADAR
    WIND
    EXTRACTION
    COHERENCE
    日期: 2017
    上传时间: 2017-04-27 10:10:45 (UTC+8)
    摘要: It is well known that the primary targets responsible for first-order sea echoes observed by a High-Frequency (HF) radar are the advancing and receding ocean waves with the wavelengths at Bragg scales. However, in light of the fact that the ionospheric sporadic E (Es) and F layers may be present in the viewing range of the HF radar for ocean wave detection, the radar returns reflected from the F and Es layers may significantly contaminate the ocean wave power spectrum. The characteristics of the first-order sea echoes and ionospheric interferences measured by the CODAR-SeaSonde in Taiwan area are analyzed and presented in this article. The coherences and phases of the normalized cross spectra of the sea and ionospheric echoes between different pairs of the receiving channels are calculated, respectively. One of the striking features presented in this report is that the ionospheric echo heights scaled from the ionogram observed by the Chung-Li ionosonde are about 30 km lower than those observed by the DATAN CODAR-SeaSonde. It is also found that the coherences of the sea echoes are generally smaller than those of the ionospheric echoes by about 15% on average, and the phase fluctuations (standard deviations) of the sea echoes are substantially larger than those of the ionospheric layer reflection echoes. In addition, statistics show that the sum of the mean phases of the ionospheric echoes between the three receiving channel pairs is approximately zero, while it is not for the sea echoes. These results seemto suggest that the use of the discrepancies in the characteristics of the coherences and phases between the sea and ionospheric echoes may provide
    關聯: INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION 文獻號碼: 1756761
    显示于类别:[光電物理系] 期刊論文

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