Multi-Channel High-Speed Digital Signal Transmission And Real-Time Display System Design And Implementation

In the technological developing days, The underwater target positioning and recognition has a great application to the ocean developing fields, like underwater oil and gas pipelines layout, Underwater rescuing, divers underwater positing and waterways foreign removal. In the process of Marine development, in order to analyze the states of the ocean, there need various data. The high speed and stable data transmission has become a problem to be solved. Multi-channel high speed digital signal transmission and display system can be implemented on a large amount of data transmission, also it can realize the data real-time observation.In the multi-channel high-speed digital signal transmission and real-time display system, Data acquisition card collects four road data through the LVDS interface, the data will be transported to the optical fiber data acquisition card through the optical fiber; The optical fiber data acquisition card transfer the data to PC through the PCI Express interface. The data will be real-time displayed through the LabVIEW.Multi-channel high speed digital signal transmission and real-time display system adopt the method of modularization, On the basis of system requirements analysis, designing and realization of each module, including data acquisition card module, PCI Express fiber acquisition card module, real-time display module. The main function of the data acquisition card is multi-channel digital signal collection and communication with the PCI Express optical fiber acquisition card. Data acquisition card implementation is divided into two parts of the hardware circuit and software program. Hardware circuit using the Spartan - 6 series Xc6slx45t as main control chip, using an LVDS interface to realize the collection and communication between the equipment, using SFP modules to communicate with the PCI Express optical fiber acquisition card; using a state machine implementation of the four-way signal acquisition control, using Xilinx company aurora nuclear realization of optical fiber communication.The PCI Express optical fiber data acquisition card is the most core part of the system. The hardware part of PCI Express optical fiber Acquisition card is composed of Spartan-6 series FPGA, DDR2 and SFP interfaces. The main function of the PCI Express optical fiber Acquisition card is to use the Xilinx company aurora nuclear realization of optical fiber communication between the card and the data acquisition card, the data within the DDR2 cache, using DMA way to transmit data to the PC.Lab VIEW has been used in the real-time display part to realize the real-time display of data. Lab VIEW display the data which is transfered form the PCI Express fiber acquisition card to the PC using Dynamic link library. After a period of debugging and running, the system can meet the 4-way high-speed data signal transmission and the real-time display of the function.