Method for obtaining net tensioning net position and catching efforts based on ship position data

Abstract

The invention relates to a method for acquiring a net tensioning net position and catching efforts based on ship position data, which comprises the following steps: extracting the characteristics of the speed, the deflection angle and the distance between adjacent ship position points in a time sequence of each ship position point as a training set, and inputting the training set into a BP neuralnetwork for training; preprocessing each ship position point data of the complete voyage of the strange fishing vessel by adopting the same mode, inputting the data into a trained BP neural network, and judging the possible operation state of each ship position point through the BP neural network; and determining the starting time, the ending time and the net position coordinates of net releasingof the net-opening fishing boat from the screened ship position points of the driving state and the net retracting state, calculating the net releasing duration and the fishing effort of each net-opening net, and counting the fishing effort of all the net times in the voyage to obtain the accumulated fishing effort of the voyage. The method can be suitable for extracting the net position coordinates and the fishing effort of the net-tensioning fishing vessel in each voyage operation from the Beidou ship position data.

Description

technical field [0001] The invention relates to the technical field of application of fishing boat position data, in particular to a method for acquiring net position and fishing effort based on ship position data. Background technique [0002] Vessel Monitoring System (VMS, Vessel Monitoring System) can provide time, location and dynamic information of fishing boats. At present, nearly 50,000 fishing boats in my country are equipped with automatic identification equipment (AIS), nearly 50,000 Beidou satellite ship position monitoring, and CDMA public mobile communication equipment. 110,000 ships, initially realizing real-time contact, tracking and monitoring of the positions of ocean fishing vessels. International research on the monitoring position of existing fishing boats to analyze the fishing status of fishing boats can be summarized into three methods: (1) Judging the fishing status by analyzing the change of the speed of the boat; (2) Judging the fishing status by ana...

AI Technical Summary

Problems solved by technology

Existing methods are not suitable for the analysis of ship position data of Beidou satellites with high time resolution. Currently, there is no method for judging the secondary position of fishing boats operating on Beidou satellites.

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