Abstract
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%.
Highlights
The observation and exploration of the ocean have many significances in the utilization of marine resources, the safety of ship navigation, and the construction of shore ports.Through the high-resolution radar equipment, the wave motion can be observed in real time
The zero-pixel percentage (ZPP) and μ are calculated in the occlusion area, and the ratio of zero intensity to echo (RZE) parameter is calculated by the Equation (5)
According to the method mentioned above, the RZE parameter of a selected radar image is calculated and compared with the determined threshold T to determine whether image is calculated and compared with the determined threshold T to determine whether the radar image is contaminated by rainfall
Summary
The observation and exploration of the ocean have many significances in the utilization of marine resources, the safety of ship navigation, and the construction of shore ports. Based on engineering experience and a large number of ocean wave retrieval experiments, the threshold of the ZPP method is set as 10% in Ref. It is difficult to accurately detect whether the radar image is contaminated by rainfall, and this method needs further research and improvement. The occlusion area is used as the rainfall detection area of the radar image to improve the detection accuracy, and the detection threshold is determined by statistical analysis of a large number of radar image data. This article is the first article to select the occlusion area for rainfall detection, and the first article to retrieve the rainfall intensity level from X-band marine radar images.
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