【作者】 王政；

【导师】 马子龙；

【作者基本信息】 哈尔滨工业大学 ， 电子与通信工程， 2015， 硕士

【摘要】 中频接收机是现代雷达系统中必不可少的组成部分,随着大规模集成电路的发展,应用软件无线电思想基于FPGA实现数字化中频接收机的方案得到了广泛应用。本文设计和实现了4通道数据采集中频接收机,接收机板卡由FPGA载卡和通过FMC接口连接的4通道数据采集板卡组成,实现对4通道并行中频信号的数据采集,并基于FPGA完成数字下变频处理,最后通过PCI Express接口实现数据的实时高速上传。本文首先介绍了中频接收机的设计方案和相关理论,分析了数字下变频、多速率数据处理、CIC滤波器等相关的原理,并给出了数字下变频算法的设计,随后通过Matlab仿真验证了设计正确性。其次,给出了4通道数据采集中频接收机的硬件设计,对数据采集卡的结构和各个模块进行了说明,并给出了数据采集卡的电路原理图设计和PCB绘制,还介绍了FPGA开发板的结构功能。随后给出了中频接收机的软件设计内容,基于Xilinx公司的Kintex7系列FPGA芯片实现了数字下变频模块,给出了PCI Express接口基于FPGA IP核的实现方法,介绍了事务层的传输模块和发送模块的工作过程,以及以DMA方式实现数据传输的方法,并给出了具体设计方案。随后在上位机利用Windriver软件开发了PCI Express驱动程序,实现数据的高速接收。最后,根据接收机板卡的设计内容,使用Model Sim软件对各个模块进行了功能仿真,并使用Xilinx公司的在线逻辑分析仪Chipscope软件进行数据抓取,完成了电路验证,最后对4通道数据采集中频接收机进行整体功能验证,对上传到上位机的数据进行时域分析和频谱分析,验证了4通道数据采集中频接收机设计的正确性。更多还原

【Abstract】 Intermediate frequency(IF) receiver is an important part of the modern radar systems,with the development of the large scale integrated circuits, the design of digital IF receiver based on FPGA applying software defined radio ideology has been widely used.This paper designs and implements a 4-channel data acquisition IF receiver, the receiver board consists of the FPGA carrier card and the 4-channel data acquisition board with the FMC interface. The receiver realized the data acquisition of 4-channel parallel IF signal, and completes the digital down conversion based on FPGA, and finally enables real-time high-speed data upload through the PCI Express interface.This paper introduces the design and theory of IF receiver firstly, analyzes the principle of a digital down conversion, multi-rate data processing, CIC filters. And gives the design of DDC algorithm, then verifies the correctness of the design by Matlab simulation. Secondly, gives the hardware design of IF receiver with 4-channel data acquisition, explains the structure and each module of data acquisition card, and shows the circuit schematic design and PCB, then describes the structure and function of FPGA development board. Next gives the software design of IF receiver, describes the implementation of DDC based on Xilinx’s FPGA chip of Kintex7 series, also gives the implementation of PCI Express interface based on FPGA IP core, introduces the transmission and receiver module, and a method to implement DMA. Then it develops PCI Express driver using Windriver on the computer to rececive data. Finally, based on the board’s design content, uses Model Sim software for each module function simulation, and uses the Xilinx’s Chipscope software to capture data for circuit verification. Finally, tests the overall function of IF receiver with 4-channel data acquisition, takes the time-domain analysis and spectrum analysis of data uploaded to the host computer, confirms that the design of 4-channel data acquisition IF receiver is correct.更多还原