Research And Test Of High-speed Data Acquisition Technology Based On 10 Gigabit Ethernet

With the process of national strategy and discipline research informatization,the importance of collecting and summarizing various information elements of research objects is becoming more and more prominent,the application demand of various data acquisition equipment is becoming more and more extensive,and the scene of data acquisition is also developing towards the direction of complexity,distribution and platform.Common data acquisition devices are mainly oscilloscopes and acquisition cards.Although these devices have excellent performance,most of them are bulky and heavy.Portable data acquisition cards make up for these shortcomings to a certain extent,but most of them use serial communication or traditional Ethernet as the transmission medium,with low transmission rate,which makes it difficult to use in the scenario of high sampling rate and long distance.To solve this problem,this paper innovatively proposes a data acquisition system using optical fiber technology as the medium,which ensures the portability of the sampling equipment and at the same time makes the sampling rate reach the level of GSPS.Firstly,this paper takes the 10 Gigabit Ethernet protocol stack as the research target,establishes the overall design model of the 10 Gigabit Ethernet UDP/IP protocol stack.Combined with the specification of 10 Gigabit Ethernet and the target requirements of data acquisition,the basic theoretical model of ten Gigabit Ethernet UDP/IP protocol stack and the working principle of each protocol in the protocol stack are introduced in detail;The basic composition and working principle of physical layer of ten Gigabit Ethernet are introduced;The overall structure of 10 Gigabit Ethernet UDP/IP protocol stack is designed;The receiving,transmitting and state transfer methods of the protocol stack are studied,which provides the theory and design basis for the realization of 10 Gigabit Ethernet data transmission link.Secondly,taking the time-interleaving method as the research goal,a fourchannel high-speed data acquisition and storage module is designed and developed.The basic theory and basic principle of time-interleaving technology are analyzed through mathematical derivation;The influence of TIADC on the performance of the data acquisition system is analyzed by introducing the unique mismatch error;The time mismatch error estimation based on the orthogonal characteristics of the signal and the error compensation based on the Taylor expansion formula are studied;To meet the demand of high-speed storage of sampled data,a 1GSPS high-speed data acquisition and storage module is developed using DDR3 SDRAM;The logic method of time mismatch error correction and the storage method of corrected data are studied,which provides the theoretical and technical basis for the realization of 1GSPS data acquisition and storage.Finally,for the high-speed data acquisition and transmission requirements,a 10 Gigabit Ethernet high-speed data acquisition module based on optical fiber technology has been built and its performance has been tested.Using Xilinx’s K7 series FPGA as a platform,a prototype of the 10 Gigabit Ethernet 1GSPS data acquisition system was built,and the IP core of the development kit was used to complete the bit error rate and eye graph tests;The Wireshark software was used to test the protocol stack function and transfer rate;Wave Vision software was used to complete the time mismatch correction algorithm test.The test results show that the transmission rate is 9.3Gbps,there is no error in the transmission process,and APR and ICMP responses are realized.The ENOB has increased from 6.83 bit to 7.60 bit,which is an increase of 0.77 bit,which verifies the feasibility and reliability of highspeed data acquisition and transmission on ten Gigabit Ethernet.