Dual Ethernet & CAN Redundancy Based Design For FOG Display And Control Devices

With the rapid development of inertial navigation devices represented by high-precision IFOG(Interferometric Fiber-Optic Gyro),recently researching fiber-optic gyroscopes INS with a high accuracy,good stability,high reliability and long – endurance is being the center of attention in navigation system.Because the display and control device of fiber compass plays an important role in HCI(Human Computer Interaction),its reliability directly impacts the stability of the whole system.This paper studies and designs the display and control device of fiber compass based on du dual redundant Ethernet and CAN.Finally through the modularization design,it realizes the system's date-reception,the display of LED,the key-operation,the information processing outside and the communication between ship and redundancy network with higher reliability.Firstly,this paper gives a brief introductions about INS technology,then introduces not only main contents of this paper but a general designing plan of this system in great detail.According to system demand,it presents the development and application of network communication technology and CAN bus technology detailedly.In the end,it researched and designed the display and control device of fiber compass based on Double-Network Redundancy and Double-CAN Redundancy.The entire system goes for the layout that takes FPGA as Hardware core,and achieves reception of multiplex signal and Protocol Conversion by Nios II CPU.Then by CAN bus,Ethernet communication mode of transmission function of the navigation data and pilot,at the same time through the display control device to set working mode of initial parameters,system control,state display and information transmission monitoring,fault diagnosis and alarm functions.On PC,this paper also designed a set of PC program as assistant to complete the display processing and initial parameters of the data set and other functions.The design part of this paper mainly divided into two system design for a part of hardware circuit design and software program.The main use of the hardware circuit part is Altera company production of Cyclone series III chip EP3C10E144I7 to realize the control of the system and the function of data transmission through the Nios II soft core processor to generate Qsys system;CAN Bus Transceiver used CTM1051 A and STM32F107 to complete the CAN bus communication;network communication part used the W5300 chip to realize the Ethernet communication function.A soft program design is mainly designed through the Nios programming II,the completion of the multi-channel signal acquisition,display and control functions,and data through dual redundant Ethernet module,dual redundant CAN module and the ship autopilot for data exchange,complete the navigation function.Finally,this paper conducted system module function test and the overall alignment,corrected system insufficiency,proposed further enhance the opinions.The final experimental debugging result shows that the set of the display and control system has a strong ability to adapt in a variety of environments,and can work stably in a long time.Through long-term experiments,this system has high stability and reliability,which can be used in the practice.