Research on Real-Time Anomaly Detection of Fishing Vessels in a Marine Edge Computing Environment

Algorithm 3

VAD-SNS.

	Input:
	trajectory
	Output:
	abnormal index
	Begin
(1)	for eachdo
(2)	Obtain a time-space neighbor trajectory segment set for
(3)	Calculate the local difference of
(4)	Calculate ’s local anomaly factor
(5)	Calculate the local anomaly factors the for current trajectory flow
(6)	Obtain the anomaly index using time decay function
(7)	return
	End