A Method for Rainfall Detection and Rainfall Intensity Level Retrieval from X-Band Marine Radar Images

Autor: Ying Zhou, Lei Sun, Zhizhong Lu
Jazyk: angličtina
Rok vydání: 2021
Předmět:
010504 meteorology & atmospheric sciences
rainfall intensity level retrieval
0211 other engineering and technologies
X band
02 engineering and technology
ratio of zero intensity to echo (RZE)
rainfall detection
01 natural sciences
lcsh:Technology
law.invention
lcsh:Chemistry
Marine radar
law
Radar imaging
General Materials Science
Radar
Instrumentation
lcsh:QH301-705.5
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Remote sensing
Fluid Flow and Transfer Processes
X-band marine radar images
lcsh:T
Process Chemistry and Technology
Echo (computing)
General Engineering
Experimental research
lcsh:QC1-999
Computer Science Applications
occlusion area
Noise
lcsh:Biology (General)
lcsh:QD1-999
lcsh:TA1-2040
Environmental science
lcsh:Engineering (General). Civil engineering (General)
Intensity (heat transfer)
lcsh:Physics
Zdroj: Applied Sciences, Vol 11, Iss 1565, p 1565 (2021)
Applied Sciences
Volume 11
Issue 4
ISSN: 2076-3417
Popis: Currently, it is a hot research topic to retrieve the wave parameters by using X-band marine radar. However, the rainfall noise usually exists in the collected marine radar images, which seriously interferes with the extraction of the wave parameters. To reduce the influence of rainfall noise, the zero-pixel percentage (ZPP) method is widely used to detect rainfall in radar images, but the detection accuracy is limited, and the selection of the threshold needs to be further studied. Based on the ZPP method, the ratio of zero intensity to echo (RZE) method for rainfall detection is proposed in this paper. The detection threshold is determined by statistical analysis of a large amount of radar data. Additionally, it is proposed for the first time to retrieve the rainfall intensity level from X-band marine radar images. In addition, the concept of the occlusion area is proposed. The proposed area and the wave area are used as the rainfall detection area of the radar image, respectively, for experimental research. The data obtained from the Pingtan experimental base in Fujian Province are used to verify the effectiveness of the proposed method. The experimental results show that the detection accuracy of the proposed method is 11.7% higher than that of the ZPP method, and the accuracy of rainfall intensity level retrieval is 84%.
Databáze: OpenAIRE
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