Reserch And Implement Of High Speed Signal Sampling And Transmission Technology Based On ZYNQ

As ground penetrating radar has been widely used in the fields of highway survey,geological exploration and archaeological exploration in the era of information technology,it has also made rapid progress.Three-dimensional ground penetrating radar is a new detection technology that has emerged in recent years,featuring high density and fast and seamless scanning.In addition to the traditional two-dimensional ground penetrating radar technology,it has the advantages of massive data,true three-dimensional acquisition,and high degree of restoration of underground structures.Based on the theoretical research of 3D ground penetrating radar,this thesis studies the high-speed sampling technology of echo signals in 3D ground penetrating radar system,and then studies the high-speed data transmission technology for the collected massive data.Thus,a high-speed signal acquisition system that can be applied to the three-dimensional ground penetrating radar is implemented on the ZYNQ.First of all,this paper has done a certain theoretical research,first introduces the status quo at home and abroad,including the status quo of ground penetrating radar,high-speed signal acquisition technology and high-speed transmission technology at home and abroad.Based on this,Xilinx's ZYNQ series chip is studied.Its system architecture is ARM+FPGA.ZYNQ's rich on-chip resources and unique ARM structure combined with the ARM-side Gigabit Ethernet port make it the most suitable for this topic.The development platform;on the basis of the sampling theorem,the real-time sampling and equivalent sampling are compared and analyzed.The equivalent sampling is suitable for the sampling method of the ground penetrating radar echo signal,and then how to use a piece of ADC chip to achieve high speed.Equivalent sampling;high-speed differential serial port data transmission based on differential transmission and related high-speed serial bus transmission are also studied,and SRIO bus data transmission is selected to meet the higher inter-board high-speed data transmission technology in the future.Secondly,the high-speed signal acquisition system suitable for 3D ground penetrating radar is designed and implemented.The high-speed signal acquisition system of the three-stage mode of the acquisition board,the main control board and the upper computer is realized.The high-speed differential serial port is used to transmit data between the acquisition board and the main control board.The Gardner bit synchronization is used to solve the problem that the sampling clock and data clock of the serial port are not synchronized.The main control board and the host computer use Gigabit Ethernet port communication.The host computer can also send a self-test command to detect whether the status of each part is normal,and then send the parameters to the acquisition board and the main control boa rd,and the acquisition board completes the high-speed equivalent sampling of the radar echo signal according to the received parameters,and passes the main The control board integrates the collected data and uploads it to the host computer at a high rate.Finally,in order to meet the higher data transfer rate between boards in the future,a high-speed data transmission technology based on SRIO bus is introduced.The SRIO bus data transmission principle is briefly introduced from the protocol structure,packet structure and transaction classification of the SRIO bus.The data transmission of the SRIO bus is also introduced in the FPGA.Next,the simulation results of the SRIO bus data transmission are given.A high-speed data transmission of the SRIO bus loopback is implemented on ZYNQ.