安检设备数据传输电路的设计与实现

发布时间：2018-08-09 19:09

【摘要】：近年来,由于公共安全形势的紧迫性和重要性,安检设备大量应用于各类公共场所的日常或者重大活动时的检查工作中。其中,X射线安检设备应用最为广泛。随着X射线安检设备自身的升级以及检测技术的发展和融合,对安检系统硬件电路的性能要求逐步提升。本文对安检系统中的数据采集模块和数据传输电路进行研究,其中数据采集模块的功能是将探测前端电路的模拟输出转换为数字信号,数据传输电路将这些数字信号传送给计算机进行终端成像,从而实现物体判别。数据采集模块选用TI公司的ADS8363芯片来实现。ADS8363是一款双通道16位逐次逼近型AD芯片,采样率最高可达1 MHz。详细介绍了数据采集模块的硬件设计和逻辑设计以及硬件电路测试。硬件电路测试又分为单独模块测试和联合前端探测电路的协同测试,对电路的功能和工作时序进行了验证,同时也测试出数据采集模块在两种状态下的转换精度。经过对多种传输方案的比较分析,并结合安检设备数据传输电路的需求,数据传输电路确定以FPGA实现MAC核外加物理层芯片的方案实现网络传输。根据网络传输原理和IEEE802.3协议,设计并实现了用于数据发送的以太网MAC层的IP核,并对MAC核的模块组成及各部分的功能和逻辑设计进行具体说明,然后对PHY层芯片88E1111的控制逻辑设计进行了简要介绍,最后给出重要模块的仿真结果和相应的分析。
[Abstract]:In recent years, due to the urgency and importance of the public safety situation, the security inspection equipment is widely used in the inspection work of daily or important activities in all kinds of public places. Among them, X-ray inspection equipment is the most widely used. With the upgrading of X-ray security equipment and the development and integration of detection technology, the performance requirements of the hardware circuit of the security inspection system are improved step by step. In this paper, the data acquisition module and the data transmission circuit in the security inspection system are studied. The function of the data acquisition module is to convert the analog output of the detection front-end circuit into the digital signal. The data transmission circuit transmits these digital signals to the computer for terminal imaging, thus realizing object discrimination. The data acquisition module uses TI's ADS8363 chip to realize. ADS8363 is a double channel 16-bit successive approximation AD chip with a sampling rate of up to 1 MHz. The hardware design, logic design and hardware circuit test of data acquisition module are introduced in detail. The hardware circuit test is divided into single module test and joint front-end detection circuit test. The function and working timing of the circuit are verified. At the same time, the conversion accuracy of the data acquisition module in two states is also tested. Through the comparison and analysis of various transmission schemes and the requirements of the data transmission circuit of the security inspection equipment, the data transmission circuit determines that the MAC core and physical layer chip can be used to realize the network transmission with FPGA. According to the principle of network transmission and IEEE802.3 protocol, the IP core of Ethernet MAC layer used for data transmission is designed and implemented. The module composition of MAC core and the function and logic design of each part are explained in detail. Then, the control logic design of PHY chip 88E1111 is briefly introduced. Finally, the simulation results of important modules and corresponding analysis are given.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X924.2

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