基于AD9910的Ku波段雷达信号源的设计与实现
发布时间：2019-04-03 20:17
【摘要】：军事上的需求促进了雷达在理论和体制上的极大发展,除了应用于军事上外,雷达在空中交通管制中用于对飞机航路和终端区域的监视,此外,雷达也广泛用于民用上。脉冲压缩雷达是一种新体制雷达,它最重要的优势在于解决了作用距离、距离分辨率和速度分辨率之间相互矛盾的问题,同时具有良好的抗干扰性能。雷达波形的参数对雷达性能具有至关重要的作用,脉冲的持续时间关系到发射信号的能量和雷达的作用距离,在工作频率确定的情况下速度分辨率与时宽成正比,而距离分辨率与信号带宽成正比。因此通过控制发射波形的时宽和带宽能够同时获得远作用距离、高距离分辨率和高速度分辨率。此外发射信号的相位噪声、杂散和线性度等指标也关系到雷达的信号检测和处理。本文根据Ku波段脉冲雷达信号源的实现目标和指标要求,基于FPGA和DDS芯片AD9910设计并实现了VHF频段的雷达信号源,主要产生了四类信号:(1)线性调频波形;(2)相位编码波形;(3)脉冲调制信号;(4)连续波。根据4位DDS波形控制码和导前脉冲信号输出14种模式的波形,并完成不同模式间的快速切换。波形的参数包括中心频率、调频带宽和调频脉宽等。本文从硬件和软件两个方面设计并实现了满足指标要求的雷达信号源。主要内容如下:首先,概述了脉冲压缩雷达系统和频率源技术的发展现状。然后,简要介绍了脉冲压缩雷达的基本原理和典型的四种脉冲压缩波形,重点介绍了DDS的工作原理和特点;介绍了雷达信号源关注的指标以及基于PLL和DDS技术实现的常用技术。其次,根据指标要求设计了模块实现方案;合理选用DDS和FPGA等器件,给出了硬件电路的设计过程;详细介绍了DDS控制器的FPGA实现。最后,完成了软硬件的调试,给出了VHF雷达信号源的测试结果,分析了调试过程中的问题;给出了系统联合测试结果,最终结果满足指标要求。
[Abstract]:Military requirements promote the great development of radar in theory and system. In addition to military applications, radar is used in air traffic control to monitor aircraft routes and terminal areas. In addition, radar is also widely used in civilian applications. Pulse compression radar is a new radar system. Its most important advantage is that it solves the contradiction among operating range, range resolution and velocity resolution, and has good anti-jamming performance at the same time. The parameters of radar waveform play an important role in radar performance. The duration of the pulse is related to the energy of the transmitted signal and the operating range of the radar. The velocity resolution is proportional to the time width when the working frequency is determined. The range resolution is proportional to the bandwidth of the signal. Therefore, long-range, high-range resolution and high-speed resolution can be obtained simultaneously by controlling the time width and bandwidth of the transmitted waveform. In addition, the phase noise, spurious and linearity of the transmitted signal are also related to the radar signal detection and processing. According to the target and target requirement of pulse radar signal source in Ku band, this paper designs and implements the radar signal source in VHF band based on FPGA and DDS chip AD9910, which mainly produces four kinds of signals: (1) LFM waveform; (2) phase coded waveform; (3) pulse modulated signal; (4) continuous wave. According to the 4-bit DDS waveform control code and the pre-pilot pulse signal, 14 modes of waveforms are outputted, and the fast switching between different modes is accomplished. The parameters of the waveform include the center frequency, frequency modulation bandwidth and frequency modulation pulse width. In this paper, a radar signal source is designed and implemented from the aspects of hardware and software. The main contents are as follows: firstly, the development of pulse compression radar system and frequency source technology is summarized. Then, the basic principle of pulse compression radar and four typical pulse compression waveforms are briefly introduced, especially the working principle and characteristics of DDS, and the concerned indexes of radar signal source and the commonly used techniques based on PLL and DDS technology are also introduced. Secondly, the realization scheme of the module is designed according to the requirement of the index; the design process of the hardware circuit is given with reasonable selection of DDS and FPGA, and the FPGA implementation of the DDS controller is introduced in detail. Finally, the hardware and software debugging is completed, the test results of VHF radar signal source are given, the problems in the debugging process are analyzed, and the joint test results of the system are given, and the final results meet the requirements of the target.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51
本文编号：2453534
[Abstract]:Military requirements promote the great development of radar in theory and system. In addition to military applications, radar is used in air traffic control to monitor aircraft routes and terminal areas. In addition, radar is also widely used in civilian applications. Pulse compression radar is a new radar system. Its most important advantage is that it solves the contradiction among operating range, range resolution and velocity resolution, and has good anti-jamming performance at the same time. The parameters of radar waveform play an important role in radar performance. The duration of the pulse is related to the energy of the transmitted signal and the operating range of the radar. The velocity resolution is proportional to the time width when the working frequency is determined. The range resolution is proportional to the bandwidth of the signal. Therefore, long-range, high-range resolution and high-speed resolution can be obtained simultaneously by controlling the time width and bandwidth of the transmitted waveform. In addition, the phase noise, spurious and linearity of the transmitted signal are also related to the radar signal detection and processing. According to the target and target requirement of pulse radar signal source in Ku band, this paper designs and implements the radar signal source in VHF band based on FPGA and DDS chip AD9910, which mainly produces four kinds of signals: (1) LFM waveform; (2) phase coded waveform; (3) pulse modulated signal; (4) continuous wave. According to the 4-bit DDS waveform control code and the pre-pilot pulse signal, 14 modes of waveforms are outputted, and the fast switching between different modes is accomplished. The parameters of the waveform include the center frequency, frequency modulation bandwidth and frequency modulation pulse width. In this paper, a radar signal source is designed and implemented from the aspects of hardware and software. The main contents are as follows: firstly, the development of pulse compression radar system and frequency source technology is summarized. Then, the basic principle of pulse compression radar and four typical pulse compression waveforms are briefly introduced, especially the working principle and characteristics of DDS, and the concerned indexes of radar signal source and the commonly used techniques based on PLL and DDS technology are also introduced. Secondly, the realization scheme of the module is designed according to the requirement of the index; the design process of the hardware circuit is given with reasonable selection of DDS and FPGA, and the FPGA implementation of the DDS controller is introduced in detail. Finally, the hardware and software debugging is completed, the test results of VHF radar signal source are given, the problems in the debugging process are analyzed, and the joint test results of the system are given, and the final results meet the requirements of the target.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51
【参考文献】
相关期刊论文 前1条
1 陈文婵;;AN/TPS-59战术雷达[J];现代雷达;1980年03期
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