基于FPGA的高速数据采集处理系统的设计与实现
Title Design and Realization of High-speed Data Acquisition
and Processing System based on FPGA
Abstract
The design of high-speed data acquisition and processing system is the
foundation of modern digital signal processing systems, the high-speed
data acquisition and storage system has been widely used in radar,
communications, telemetry, remote sensing, electronic countermeasures,
image processing field. With the continuous development of technology and
information technology, the requirements of data acquisition getting
higher and higher, how to acquisition and processing of data real-time and
high-speed is a critical issue,and also a hot area in current.
This subject is based on the radar electromagnetic environment
simulator, The IF signal of bandwidth of 400MHz and center frequency of
250MHz is sampling in 900MSPS, then the sampled data is received through
the FPGA LVDS MegaWizard Plug-In Manager and series-parallel conversion
and asynchronous interfaces, storage to SSRAM ,wait until you need and then
the data stored can be read out through the Doppler frequency shift
modulation intensive target interference algorithm, then the data is
revert to the analog signal by the high-speed DA.
Keywords: high-speed data acquisition,DRFM,Hilbert,Doppler,dense
multi-false target jamming,FPGA 目 录
1 绪论 1
1.1 研究背景与意义 . 1
1.2 国内外发展现状 . 1
1.3 课题研究内容 . 2
1.4 论文章节安排 . 3
2 数据采集存储的相关理论 4
2.1 信号采样理论 . 4
2.1.1 Nyquist 采样定理 4
2.1.2 带通采样定理 . 5
2.2 数字射频存储技术 . 6
2.2.1 数字射频存储的基本原理 . 7
3 雷达电磁环境模拟器的硬件电路设计 . 8
3.1 电磁环境模拟器的功能要求 8
3.2 系统组成及工作原理 . 9
3.2.1 收发单元以及天线 9
3.2.2 信号处理单元 . 9
3.2.3 系统工作原理 . 10
3.3 高速数据采集的硬件电路设计 11
3.3.1 电源电路 11
3.3.2 AD 转换电路 14
3.3.3 数据存储电路 17
3.3.4 DA 转换电路 19
3.3.5 PCB 设计 . 21
4 高速数据采集与处理技术及 FPGA 实现 22
4.1 数据采集与存储 22
4.1.1 数据采集模块 22
4.1.2 异步接口模块 27
4.1.3 数据存储模块 31
4.2 多普勒频移的数字实现 32
4.2.1 DDS 的基本原理 . 33
4.2.2 希尔伯特变换器的实现 37
4.2.3 单边带调制的 FPGA 实现 . 41
4.3 密集多假目标干扰 42
结 论 . 47