干旱区生态环境知识资源中心(Arid): An Algorithm for Detecting Coherence in Cyclone Global Navigation Satellite System Mission Level-1 Delay-Doppler Maps

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DOI	10.1109/TGRS.2020.3009784
	An Algorithm for Detecting Coherence in Cyclone Global Navigation Satellite System Mission Level-1 Delay-Doppler Maps
	Al-Khaldi, Mohammad M.; Johnson, Joel T.; Gleason, Scott; Loria, Eric; O'Brien, Andrew J.; Yi, Yuchan
通讯作者	Al-Khaldi, MM (corresponding author), Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA.
来源期刊	IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
ISSN	0196-2892
EISSN	1558-0644
出版年	2021
卷号	59 期号:5 页码:4454-4463
英文摘要	An algorithm for detecting coherence in Cyclone Global Navigation Satellite System (CYGNSS) mission delayDoppler maps (DDMs) is presented. Because CYGNSS DDMs report only the observed power without phase information, the algorithm uses estimates of power spread within the DDM to flag coherency. Since the estimate used is a ratio of the powers in differing portions of the DDM, it is less sensitive to absolute power calibration and to the GPS C/A code type observed, and is applied to CYGNSS Level-1 uncalibrated DDMs. The basic detector formulation is described along with modifications to improve performance in lower signal-to-noise ratio (SNR) situations. The required detection thresholds are determined using matchups with CYGNSS Raw I/F mode measurements for which the DDM phase can be computed and used to identify coherence more precisely. Application of the final detector over a large CYGNSS data set suggests that approximately 8.9% of all inland returns are coherent. Inland regions persistently identified as coherent were found largely to be associated with the presence of water bodies. A smaller set of desert locations apparently having very low surface roughness were also found to be associated with persistent coherence. The detector was also applied to a set of ocean measurements, with the results showing that persistent coherence is limited to areas with sheltered waters. Ocean tests avoiding such regions indicate that the detector's false-alarm rate is approximately 0.0012% for the detection threshold used.
英文关键词	Bistatic radar systems coherency Cyclone Global Navigation Satellite System (CYGNSS) Global Navigation Satellite Systems Reflectometry (GNSS-R) rough surface scattering
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000642096400059
WOS关键词	GNSS-R ; SOIL-MOISTURE ; SCATTERING ; SIGNALS ; REFLECTIONS ; OCEAN ; CONSTELLATION ; PERFORMANCE ; ALTIMETRY
WOS类目	Geochemistry & Geophysics ; Engineering, Electrical & Electronic ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Geochemistry & Geophysics ; Engineering ; Remote Sensing ; Imaging Science & Photographic Technology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350533
作者单位	[Al-Khaldi, Mohammad M.; Johnson, Joel T.; Loria, Eric; O'Brien, Andrew J.] Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA; [Al-Khaldi, Mohammad M.; Johnson, Joel T.; Loria, Eric; O'Brien, Andrew J.] Ohio State Univ, Electrosci Lab, Columbus, OH 43210 USA; [Gleason, Scott] Univ Corp Atmospher Res, Boulder, CO 80307 USA; [Yi, Yuchan] Ohio State Univ, Div Geodet Sci, Sch Earth Sci, Columbus, OH 43210 USA
推荐引用方式 GB/T 7714	Al-Khaldi, Mohammad M.,Johnson, Joel T.,Gleason, Scott,et al. An Algorithm for Detecting Coherence in Cyclone Global Navigation Satellite System Mission Level-1 Delay-Doppler Maps[J],2021,59(5):4454-4463.
APA	Al-Khaldi, Mohammad M.,Johnson, Joel T.,Gleason, Scott,Loria, Eric,O'Brien, Andrew J.,&Yi, Yuchan.(2021).An Algorithm for Detecting Coherence in Cyclone Global Navigation Satellite System Mission Level-1 Delay-Doppler Maps.IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,59(5),4454-4463.
MLA	Al-Khaldi, Mohammad M.,et al."An Algorithm for Detecting Coherence in Cyclone Global Navigation Satellite System Mission Level-1 Delay-Doppler Maps".IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 59.5(2021):4454-4463.