Study On The Simulation Of Net Recorder Equipment In Fishery Simulator

The sea fishery is a frontier that the navigation simulator applies,it can be able to overcome the abuse in the traditional training way,bring the advantage of study to the adult,also be able to satisfy "STCW-F International Convention " and "The issuing certificate request of the fishery seaman ",and has avoided inconvenience in the training with the true equipment at the same time.But,in now navigation simulator, fishery module can not satisfy the need of the fishery seaman training.The navigation simulator is hardly related to fishing boat assisting facilities,for example,vertial fish founder,fish sonar and net recorder.It has not caused attention of the correlative personnel on the research of mathematical model in fishery.In view of above cause,the paper design and simulate the equipment of Net Recorder and add it to the V.Dragon2000 Navigation Simulator as an important part of the fishery simulator.The thesis mainly focuses on how to establish the mathematical model of echo,for example,the beam of sonar,seabed echo,fish school echo and noise echo.Prime task of the paper including the following aspects:a.The paper establish the main frame of net recorder simulator and has done the simulation of it's basal function,for example three working mode of net recorder,range transforming,noise restrain and so on.Finishs the last equipment simulation in finding fish part of the fishery simulator.b.It sets up the reasonable intensity model of acoustic echo and draws the seabed echo image with corresponding colour according to the intensity of echo,it adopts the method of swapping buffer to realize dynamic display and makes the seabed image look like more real and lifelike.c.The papers adopt the shoal movement model of Floy by comparing the model of Boids with the model of Floy and think about the characteristic of the net recorder.It calculate the fish strength and select corresponding colour by the experience formula of Robert J.Urick.It displays fish echo by the technology of transparent bitmap and point scatter.Have been realized display of the shoals of fish echo in real time and noise echo,especially in displaying of the shoals of fish echo,it have much better.d.The paper realizes the echo image and the interaction interface non-twinkle display by off-screen drawing,in the same time it realizes running between Net Recorder simulator and navigation simulator in network.The data in test result and in ECDIS is consistent,so we have got much better simulator result.