FMCW测角雷达频率源的设计与实现
发布时间：2018-09-08 18:54
【摘要】：毫米波频段为26.5GHz~300GHz,具有波长短的特点,因此毫米波系统更容易小型化。毫米波技术是解决频谱资源紧缺的一项关键技术,因此毫米波技术在通信、雷达等领域有重大的价值,尤其是在汽车防撞领域。尽管毫米波线性调频连续波(Frequency Modulation Continuous Wave,FMCW)雷达具有广阔的市场价值与前景,但是目前国内毫米波雷达事业发展面临着诸多问题,如产品成本高、难以推广、技术封锁等。本课题研究的毫米波线性调频连续波体制雷达工作频段为75.9GHz-76.5GHz,具有测量精度高、发射功率低、发射波形简单等优点,除了可以应用于汽车防撞领域外,也可用于安防、无人机探测等领域。本文依托E波段FMCW测角雷达项目,通过比较不同方案的优劣势,结合各种频率源方案的特点,设计出覆盖12.65GHz-12.75GHz的Ku波段线性调频连续波频率源。频率源的结构为锁相环(Phase Locked Loop,PLL)环内混频加DDS环外混频加DDS二次混频。为了提高频谱的纯净度,最后设计了一款新型的半模基片集成波导(Half-Mode Substrate Integrated Waveguide,HMSIW)和缺陷地结构(Defected Ground Structure,DGS)组合的无源滤波器。此滤波器具有很强的选择性,适用于射频前端倍频前的滤波。本文的主要内容如下:(1)总结国内外线性调频连续波毫米波雷达及频率源研究的现状,简要介绍FMCW体制雷达角度、速度、距离测量的基本原理。(2)讨论现代频率合成的技术,主要介绍PLL和DDS模块。对比各种频率源方案的优缺点,并根据项目要求确定最优方案,并分析方案的可行性和预期性能。(3)设计并加工了一款新型结构的无源窄带带通滤波器,该滤波器使用DGS和HMSIW横向组合的方式,滤波器选择性好,经过测试后符合设计要求。(4)根据选定的方案设计频率源,包括电路设计、器件选择、程序编写和调试工作,并给出频率源的测试结果,测试结果符合项目要求。参与组织雷达系统联调,给出测试结果并予以分析。
[Abstract]:The millimeter wave band is 26.5 GHz / 300 GHz, which has the advantage of short wavelength, so it is easier to miniaturize the millimeter wave system. Millimeter-wave technology is a key technology to solve the shortage of spectrum resources, so millimeter-wave technology has great value in communication, radar and other fields, especially in the field of automobile collision prevention. Although millimeter-wave linear frequency modulated continuous wave (Frequency Modulation Continuous Wave,FMCW) radar has broad market value and prospect, the development of domestic millimeter wave radar is faced with many problems, such as high product cost, difficult to popularize, technical blockade and so on. The millimeter wave linear frequency modulation continuous wave radar studied in this paper has the advantages of high measurement precision, low transmitting power and simple transmitting waveform, which can be used in the field of automobile collision prevention as well as in security. The operating frequency range of millimeter wave linear frequency modulation continuous wave system radar is 75.9 GHz to 76.5GHz, which has the advantages of high measurement accuracy, low transmission power and simple emission waveform. UAV detection and other fields. By comparing the advantages and disadvantages of different schemes and combining the characteristics of various frequency source schemes, this paper designs a Ku band LFM continuous wave frequency source covering 12.65GHz-12.75GHz based on the E-band FMCW angle-measuring radar project. The structure of the frequency source is phase-locked loop (Phase Locked Loop,PLL) inner mixing plus DDS external mixing plus DDS secondary mixing. In order to improve the purity of the spectrum, a novel passive filter combining half-mode substrate integrated waveguide (Half-Mode Substrate Integrated Waveguide,HMSIW) and defective ground structure (Defected Ground Structure,DGS) is designed. This filter has strong selectivity and is suitable for RF front end frequency doubling filter. The main contents of this paper are as follows: (1) the current situation of the research on LFM CW millimeter wave radar and its frequency source is summarized, and the basic principles of FMCW radar angle, velocity and range measurement are briefly introduced. (2) the modern frequency synthesis technology is discussed. This paper mainly introduces PLL and DDS module. The advantages and disadvantages of various frequency source schemes are compared, the optimal scheme is determined according to the project requirements, and the feasibility and expected performance of the scheme are analyzed. (3) A novel passive narrowband bandpass filter with a new structure is designed and fabricated. The filter is composed of DGS and HMSIW laterally. The filter has good selectivity and meets the design requirements after testing. (4) the frequency source is designed according to the selected scheme, including circuit design, device selection, programming and debugging. The test results of the frequency source are given, and the test results meet the requirements of the project. Participate in organizing radar system alignment, give test results and analyze them.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN958
本文编号：2231393
[Abstract]:The millimeter wave band is 26.5 GHz / 300 GHz, which has the advantage of short wavelength, so it is easier to miniaturize the millimeter wave system. Millimeter-wave technology is a key technology to solve the shortage of spectrum resources, so millimeter-wave technology has great value in communication, radar and other fields, especially in the field of automobile collision prevention. Although millimeter-wave linear frequency modulated continuous wave (Frequency Modulation Continuous Wave,FMCW) radar has broad market value and prospect, the development of domestic millimeter wave radar is faced with many problems, such as high product cost, difficult to popularize, technical blockade and so on. The millimeter wave linear frequency modulation continuous wave radar studied in this paper has the advantages of high measurement precision, low transmitting power and simple transmitting waveform, which can be used in the field of automobile collision prevention as well as in security. The operating frequency range of millimeter wave linear frequency modulation continuous wave system radar is 75.9 GHz to 76.5GHz, which has the advantages of high measurement accuracy, low transmission power and simple emission waveform. UAV detection and other fields. By comparing the advantages and disadvantages of different schemes and combining the characteristics of various frequency source schemes, this paper designs a Ku band LFM continuous wave frequency source covering 12.65GHz-12.75GHz based on the E-band FMCW angle-measuring radar project. The structure of the frequency source is phase-locked loop (Phase Locked Loop,PLL) inner mixing plus DDS external mixing plus DDS secondary mixing. In order to improve the purity of the spectrum, a novel passive filter combining half-mode substrate integrated waveguide (Half-Mode Substrate Integrated Waveguide,HMSIW) and defective ground structure (Defected Ground Structure,DGS) is designed. This filter has strong selectivity and is suitable for RF front end frequency doubling filter. The main contents of this paper are as follows: (1) the current situation of the research on LFM CW millimeter wave radar and its frequency source is summarized, and the basic principles of FMCW radar angle, velocity and range measurement are briefly introduced. (2) the modern frequency synthesis technology is discussed. This paper mainly introduces PLL and DDS module. The advantages and disadvantages of various frequency source schemes are compared, the optimal scheme is determined according to the project requirements, and the feasibility and expected performance of the scheme are analyzed. (3) A novel passive narrowband bandpass filter with a new structure is designed and fabricated. The filter is composed of DGS and HMSIW laterally. The filter has good selectivity and meets the design requirements after testing. (4) the frequency source is designed according to the selected scheme, including circuit design, device selection, programming and debugging. The test results of the frequency source are given, and the test results meet the requirements of the project. Participate in organizing radar system alignment, give test results and analyze them.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN958
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