Article

Exploration of the Fusion Display of ECDIS and Radar Image Information in High Latitude Sea Area

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Abstract

The inconsistency between the radar image information and electronic chart information in the high latitudes can result in much difficulty on the identification of marks, which will be dangerous to the ship's navigation. By analyzing the characteristics of the projection methods of the high-latitude sea area charts, we discuss the causes for the errors of the radar image and superimposed ECDIS information. This thesis puts forward the method of subdivision of longitude in the weft to correct the Mercator projection distortion, and therefore we can get the Mercator projection which is able to meet any predetermined accuracy requirements. Based on GPS coordinates value, radar real-time location information is changed into the screen coordinates through a coordinate transformation, and we can position radar center position on the ECDIS chart accurately. In this way, we can realize the real-time, rapid, precise overlay display of radar echo and ECDIS chart.

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... ECDIS is a real-time navigation system that integrates data from ship's sensors (GPS, Radar, AIS, etc.) and electronic navigational charts (ENC) which complies with IMO (International Maritime Organization) regulations and can be used as an alternative to paper navigation charts [1], [2], [3], [4], [5]. The importance of ECDIS has grown increasingly on vessels, since International Maritime Organization (IMO) making the system mandatory from 2012 to 2018 [6], [7], [8]. ...
Article
Radar and electronic chart are important navigational equipments for vessel traffic. A method of image overlay on radar and electronic chart is proposed to improve the sailing security. The extracted radar image is processed by geometric transformation according to the local position and True North of the ship. Refer to the scanning radius of the radar, the range of electronic chart is adjusted by mercator projection transformation, and then the scale of electronic chart is changed to get the image of radar and electronic chart matching. Using electronic chart as background, radar image is overlaid in pixel level. The simulation results show that the method of image overlay on radar and electronic chart is effective for the sailing security. The coastline of electronic chart and radar image are matched well. Radar targets can be displayed in real time. The monitoring capability on ship's surrounding environment is enhanced.
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