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摘要随着社会科学技术的进步，对雷达、通信、电子对抗、多媒体、航天测量、图像等多项领域的数据采集提出了更高的要求。当前，数据采集的主要研究方向集中于怎样实现多路并行数据的高速采集，怎样使系统具有良好的可扩展性。数据采集的关键技术在于如何将大量数据同步快速地存储。本课题针对频率步进雷达的回波，设计了一种多通道高速信号采集与处理系统，并给出了具体的软硬件实现方法。在本课题设计的系统中，选用了 TI 公司的 TMS320C6000 系列的 32位定点 DSP 芯片 TMS320DM642 作为数据采集系统的主处理器。采用两片AD9238-65 实现了四路通道的 A/D 并行采集，DSP 从 FIFO 中读取采样值并进行IFFT 处理，通过扩展的串口将处理结果发送到上位机。系统还应用了可编程逻辑器件 CPLD 控制外围逻辑，大大增加了 DSP 访问外设的能力，提高了整个系统的性能。系统的硬件部分用 Altium DXP 6.9 进行原理图设计和 PCB布线，软件部分利用 TI 公司提供的 CCS3.3 进行开发。最后通过采集真实的雷达回波验证了整个系统在实时性和精度要求上能满足系统的要求。 60313
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毕业论文关键词 雷达回波 DSP 多通道 数据采集系统 A/D 采样 IFFT
Title High-speed Data acquisition System for Radar Echoes based on C6000 Abstract With the development of science and technology,radar,communication,electric countermeasures,multimedia,aerospace measurement,image and many other fields put forward higher requirements for data acquisition.At the moment,the main direction of data acquisition is how to realize thehigh-speed acquisition of multi-channel parallel dates and make the system with a good extensity.And how to store large amounts of data synchronouslyand quickly is the urgent problem in the data acquisition system. For the echos of step frequency radar，this paper put forward a multi-channel and high-speed signal acquisition and processing system ,also the realization of the software and hardware in detail.In this system, TMS320DM642,the 32-bit fixed-point DSP of TMS320C6000 series in TI company is used as the CPU of the data acquisition.Two ADs are used to realize the four channels parallel sampling.DSP reads samples,conducts the IFFT processing and sends the result to PC through the extended serial port.The programmable logic device CPLD is applied to control the peripherals logic of the whole system.It greatly increases the capability of the DSP access to peripherals and improves the rate of the data acquisition. Altium DXP 6.9,an electrical design software is used to realize the hardware part of the system.And CCS3.3,the software developing environment of TMS320 is used to realize the software of the system.Finally,we collect the real radar echos to test that the whole system can meet the acquirements in real time and high accuracy. Keywords Radar Echoes DSP multichannel Data acquisition A/D sampling IFFT
目次
1绪论.1
1.1研究背景及意义1
1.2课题研究现状1
1.3雷达回波数据采集处理的特点2
1.3.1信号调理的难度比较大2
1.3.2采样率要求高2
1.3.3外部同步脉冲触发采样3
1.3.4长时间持续不间断的实时采样与处理3
1.3.5雷达回波信号的同步采集与处理3
1.4本文的组织结构3
2高速数据采集系统总体设计与实现.5
2.1系统的主要性能指标5
2.2系统方案选择6
2.3DSP芯片的选型7
3系统硬件设计.9
3.1DSP外围电路设计及配置9
3.1.1TMS320DM642片内外设的选择、初始化配置9
3.1.2数据总线和地址总线引脚.10
3.1.3时钟引脚.11
3.1.4其他引脚.11