基于北斗船位数据灯光罩网渔船作业状态特征的提取和验证

为研究一种使用北斗船位数据提取灯光罩网渔船的作业状态特征的方法,选取桂北渔36288、61999、62666和68209四艘灯光罩网渔船2017年的北斗船位数据,使用阈值综合判别的方法判断渔船作业的状态,通过航速、水深和时间区间的阈值判别渔船作业状态的船位点,利用船位分析软件(AST)提取渔船的作业天数、作业日期、作业时长以及对应的作业位置信息,并与实际填写的渔捞日志数据进行对比验证。结果显示:提取的结果和实际记录的结果误差较小,其中作业天数每月差值在0～3 d以内;对应的作业日期准确率在94.45%以上;作业时长每日最大误差不超过2.4 h,最小误差为0 h,总平均误差为1.49 h,且提取的作业时长和渔获率存在明显的显著性差异,相关系数r=0.512(P0.01);作业距离差值较小,总体在50 km以内。因此可以确定,本研究根据北斗船位数据提取灯光罩网渔船作业状态特征的方法可靠,具有较大的实用性和现实性意义。

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

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.