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    Measurement of Range-Weighting Function for Range Imaging of VHF Atmospheric Radars Using Range Oversampling

    Source: Journal of Atmospheric and Oceanic Technology:;2013:;volume( 031 ):;issue: 001::page 47
    Author:
    Chen, Jenn-Shyong
    ,
    Su, Ching-Lun
    ,
    Chu, Yen-Hsyang
    ,
    Kuong, Ruey-Ming
    ,
    Furumoto, Jun-ichi
    DOI: 10.1175/JTECH-D-12-00236.1
    Publisher: American Meteorological Society
    Abstract: ultifrequency range imaging (RIM) used with the atmospheric radars at ultra- and very high-frequency (VHF) bands is capable of retrieving the power distribution of the backscattered radar echoes in the range direction, with some inversion algorithms such as the Capon method. The retrieved power distribution, however, is weighted by the range-weighting function (RWF). Modification of the retrieved power distribution with a theoretical RWF may cause overcorrection around the edge of the sampling gate. In view of this, an effective RWF that is in a Gaussian form and varies with the signal-to-noise ratio (SNR) of radar echoes has been proposed to mitigate the range-weighting effect and thereby enhance the continuity of the power distribution at gate boundaries. Based on the previously proposed concept, an improved approach utilizing the range-oversampled signals is addressed in this article to inspect the range-weighting effects at different range locations. The shape of the Gaussian RWF for describing the range-weighting effect was found to vary with the off-center range location in addition to the SNR of radar echoes?that is, the effective RWF for the RIM was SNR and range dependent. The use of SNR- and range-dependent RWF can be of help to improve the range imaging to some degree at the range location outside the range extent of a sampling gate defined by the pulse length. To verify the proposed approach, several radar experiments were carried out with the Chung-Li (24.9°N, 121.1°E) and middle and upper atmosphere (MU; 34.85°N, 136.11°E) VHF radars.
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      Measurement of Range-Weighting Function for Range Imaging of VHF Atmospheric Radars Using Range Oversampling

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4228214
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    contributor authorChen, Jenn-Shyong
    contributor authorSu, Ching-Lun
    contributor authorChu, Yen-Hsyang
    contributor authorKuong, Ruey-Ming
    contributor authorFurumoto, Jun-ichi
    date accessioned2017-06-09T17:25:00Z
    date available2017-06-09T17:25:00Z
    date copyright2014/01/01
    date issued2013
    identifier issn0739-0572
    identifier otherams-84834.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4228214
    description abstractultifrequency range imaging (RIM) used with the atmospheric radars at ultra- and very high-frequency (VHF) bands is capable of retrieving the power distribution of the backscattered radar echoes in the range direction, with some inversion algorithms such as the Capon method. The retrieved power distribution, however, is weighted by the range-weighting function (RWF). Modification of the retrieved power distribution with a theoretical RWF may cause overcorrection around the edge of the sampling gate. In view of this, an effective RWF that is in a Gaussian form and varies with the signal-to-noise ratio (SNR) of radar echoes has been proposed to mitigate the range-weighting effect and thereby enhance the continuity of the power distribution at gate boundaries. Based on the previously proposed concept, an improved approach utilizing the range-oversampled signals is addressed in this article to inspect the range-weighting effects at different range locations. The shape of the Gaussian RWF for describing the range-weighting effect was found to vary with the off-center range location in addition to the SNR of radar echoes?that is, the effective RWF for the RIM was SNR and range dependent. The use of SNR- and range-dependent RWF can be of help to improve the range imaging to some degree at the range location outside the range extent of a sampling gate defined by the pulse length. To verify the proposed approach, several radar experiments were carried out with the Chung-Li (24.9°N, 121.1°E) and middle and upper atmosphere (MU; 34.85°N, 136.11°E) VHF radars.
    publisherAmerican Meteorological Society
    titleMeasurement of Range-Weighting Function for Range Imaging of VHF Atmospheric Radars Using Range Oversampling
    typeJournal Paper
    journal volume31
    journal issue1
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/JTECH-D-12-00236.1
    journal fristpage47
    journal lastpage61
    treeJournal of Atmospheric and Oceanic Technology:;2013:;volume( 031 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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