北斗卫星数据提取耙刺渔船作业状态方法研究

Extraction method of rake thorn status based on data from Beidou vessel monitoring system

耙刺类渔具对海底破坏力较强,对其捕捞特征研究有助于完善渔法规范。耙刺是耙掘浅海底栖贝类的主动性渔具,作业过程可以分为慢速、拖曳耙刺、航行三种状态,各状态航速差别明显,能通过航速大小进行区分。北斗船位数据记录了一系列船位点的时间、航速、经纬度等信息,根据航速频率变化率可以确定阈值,由阈值区分出拖曳耙刺状态和非拖曳耙刺状态,从而计算获得拖曳耙刺状态的累计时间和拖曳里程。利用样点验证显示状态判断正确率在98%以上,可以很好的为渔业分析与管理提供参考。

The fishing gears of rake can destruct the seabed strongly. Research on the characteristics of fishing rake helps to improve the fishery regulation. Rake thorn generally uses boats towing operations. Rake digs the shallow sand or gravel seabed shellfish. Operation process is divided into three states, which are slow speed, dragging rake thorn and sailing. Each state speed is obviously different. The job status can be districted by the change of speed. Beidou data records the time, speed, latitude, longitude and other information of the location of fishing vessels. Threshold can be determined based on the frequency rate of velocity variation. Threshold distinguishes drag thorn state and non-state drag rake. The cumulative time and cumulative mileage of drag rake thorn state could be calculated. The verification displays that the status of judges is more than 98% accurate. It is a good reference for the analysis and management of fisheries.