步进频率雷达数字对消技术研究
发布时间：2019-03-03 16:43
【摘要】：调频连续波(FMCW)雷达与脉冲雷达相比具备以下优点:高距离分辨力、不存在距离盲区、时宽带宽积大、结构简单、体积小、成本低等,所以在汽车防撞雷达、交通监测系统、微波探矿等方面具有广泛应用。但是,连续波体制雷达的收发信号泄漏问题,导致其作用距离有限,制约了它的进一步发展。针对FMCW雷达收发信号泄漏这一突出问题,本文采用数字式射频对消的方法,降低FMCW雷达发射信号对接收通道的影响。本文的主要工作是设计一部步进频雷达,包括锁相源、发射链路、接收链路、数据采集部分,然后将射频对消技术应用于该步进频雷达。本文首先介绍了该课题的研究背景、国内外的研究情况以及研究意义,对连续波雷达存在的问题进行了简单的分析,总结了当前用来减小发射机信号泄漏对接收机的影响的方法,其中着重介绍了本系统中用到的射频对消技术的原理和实现方法。在此基础上,设计了数字式射频对消方案。数字式射频对消过程分为采样、计算和控制三个过程,通过对参考信号和泄漏信号的采样分析,将其幅值和相位进行比对,进一步计算出控制矢量调制器所需要的控制电压值,输出至数模转换器完成对矢量调制器的控制,形成与泄漏信号大小相等、相位相反的对消信号,在接收链路实现对消。经过对硬件系统的调试和分析,完成了该对消实验,实现了对射频对消模块的精确控制。实验的测试结果为:从1.8GHz到2.2GHz的400MHz带宽内,对消比达到30dB以上。最后总结了论文取得的成果和结论以及存在的问题。
[Abstract]:Compared with pulse radar, FM CW (FMCW) radar has the following advantages: high range resolution, no range blind area, large time-bandwidth product, simple structure, small volume, low cost, etc. So in automobile collision avoidance radar and traffic monitoring system, it has the advantages of high range resolution, no range blind area, large time-bandwidth product, simple structure, small volume and low cost, etc. Microwave prospecting is widely used. However, the leakage of received and received signals in CW radar restricts its further development due to its limited operating range. In this paper, the digital radio frequency cancellation method is used to reduce the influence of FMCW radar transmitted signal on the receiving channel in order to solve the problem of FMCW radar signal leakage. The main work of this paper is to design a step-frequency radar, including phase-locked source, transmitting link, receiving link, data acquisition part, and then apply radio frequency cancellation technology to this step-frequency radar. Firstly, this paper introduces the research background, the domestic and international research situation and the significance of the research, and simply analyzes the problems existing in CW radar. The current methods to reduce the influence of transmitter signal leakage on the receiver are summarized. The principle and implementation method of RF cancellation technology used in this system are emphatically introduced. On this basis, a digital RF cancellation scheme is designed. The digital RF cancellation process is divided into three processes: sampling, calculation and control. Through the sampling and analysis of the reference signal and the leakage signal, the amplitude and phase of the digital RF cancellation process are compared, and the control voltage value required for the control vector modulator is further calculated. Output to the digital-to-analog converter to complete the control of the vector modulator, the formation of the same size as the leakage signal, phase opposite cancellation signal, on the receiving link to achieve cancellation. After debugging and analyzing the hardware system, the cancellation experiment is completed, and the accurate control of RF cancellation module is realized. The experimental results are as follows: within the 400MHz bandwidth from 1.8GHz to 2.2GHz, the cancellation ratio is higher than 30dB. Finally, the paper summarizes the results and conclusions of the paper, as well as the existing problems.
【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：2433900
[Abstract]:Compared with pulse radar, FM CW (FMCW) radar has the following advantages: high range resolution, no range blind area, large time-bandwidth product, simple structure, small volume, low cost, etc. So in automobile collision avoidance radar and traffic monitoring system, it has the advantages of high range resolution, no range blind area, large time-bandwidth product, simple structure, small volume and low cost, etc. Microwave prospecting is widely used. However, the leakage of received and received signals in CW radar restricts its further development due to its limited operating range. In this paper, the digital radio frequency cancellation method is used to reduce the influence of FMCW radar transmitted signal on the receiving channel in order to solve the problem of FMCW radar signal leakage. The main work of this paper is to design a step-frequency radar, including phase-locked source, transmitting link, receiving link, data acquisition part, and then apply radio frequency cancellation technology to this step-frequency radar. Firstly, this paper introduces the research background, the domestic and international research situation and the significance of the research, and simply analyzes the problems existing in CW radar. The current methods to reduce the influence of transmitter signal leakage on the receiver are summarized. The principle and implementation method of RF cancellation technology used in this system are emphatically introduced. On this basis, a digital RF cancellation scheme is designed. The digital RF cancellation process is divided into three processes: sampling, calculation and control. Through the sampling and analysis of the reference signal and the leakage signal, the amplitude and phase of the digital RF cancellation process are compared, and the control voltage value required for the control vector modulator is further calculated. Output to the digital-to-analog converter to complete the control of the vector modulator, the formation of the same size as the leakage signal, phase opposite cancellation signal, on the receiving link to achieve cancellation. After debugging and analyzing the hardware system, the cancellation experiment is completed, and the accurate control of RF cancellation module is realized. The experimental results are as follows: within the 400MHz bandwidth from 1.8GHz to 2.2GHz, the cancellation ratio is higher than 30dB. Finally, the paper summarizes the results and conclusions of the paper, as well as the existing problems.
【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
【引证文献】
相关硕士学位论文 前1条
1 朱泽坤;无人机通信干扰系统前端研究[D];电子科技大学;2018年
，本文编号：2433900
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