Extraction and verification of operational state characteristics of light shield net vessels based on Beidou vessel position data

Abstract:

In order to study an extraction method using the Beidou position data to extract the operational status characteristics of light shield net fishing vessels, the Beidou position data of the four light shield net fishing vessels of Guibei Fishing 36288, 61999, 62666 and 68209 in 2017 were selected.The threshold comprehensive judgment method is used to judge the state of the light shield net fishing vessels operation, and the ship position of the light shield net fishing vessels operational status is determined by the threshold values of the speed, the water depth, and the time interval. The ship's position analysis software (AST) is used to extract the operating days, the operating date, the operating time, and the corresponding operating position information of the fishing vessels, and compare and verify the actual recorded fishing log data.The results show that:the error between the extracted result and the actual recorded result is small, and the monthly difference in the number of operating days is within 0-3 days; the corresponding operation date accuracy rate is above 94.45%;the maximum daily error of operation time is less than 2.4 h, the minimum error is 0 h, the total average error is 1.49 h, there is a significant difference between the extracted operating time and catch rate, the correlation coefficient is r=0.512(P<0.01); the difference in operating distance is small, and the total is within 50 km.Therefore, it can be determined that the method of extracting the operating state characteristics of the light shield net fishing vessels according to the data of the Beidou vessel position is reliable and has great practicality and practical significance.