【作者】 谭朔；

【导师】 郭伟；

【作者基本信息】 华中科技大学 ， 电磁场与微波技术， 2007， 硕士

【摘要】 汽车防撞是微波近距离测距系统应用的一个重要方面,因为调频连续波雷达的特点(结构相对简单、精度高),调频连续波雷达测距技术已经成为汽车防撞系统的主流技术。数字信号处理技术(DSP)的发展不仅使得傅利叶变换的速度加快,增强了调频连续波雷达测距的实时性,而且也使得调频连续波雷达测距电路实现变得简单。论文首先介绍了调频连续波雷达系统的工作原理和特点,并且通过比较说明调频连续波雷达系统在汽车防撞领域所具有的优势。在引出了测量多个目标时此类雷达系统所存在的问题之后,提出了论文的研究目标:一种可应用于汽车防撞的调频连续波近程测距系统。接下来论文分析了目前主要的两种应用于调频连续波多目标测量时的频谱匹配方法,针对汽车防撞要求的高可靠性和实时性,综合两种方法的长处,给出了一种多目标识别方案,并通过仿真验证了此方案的可行性。在解决了多目标识别的关键技术问题之后,论文给出了一个完整的汽车防撞雷达系统设计方案,并且详细设计其中各个模块的功能和工作流程,包括静止目标杂波对消、运动目标频谱匹配以及波形发生器设计等等。当前汽车防撞系统的发展水平基本代表了调频连续波系统研究的发展水平和趋势,国内外的很多专家都致力于开发性能优越、稳定的产品。论文的研究表明数字信号处理技术将会在调频连续波雷达测距中起到越来越重要的作用。更多还原

【Abstract】 Microwave short-distance target detection radar is widely deployed in car anti-collision system. Since frequency modulation continuous wave radar has high accuracy and relatively simple structure, it has become the most popular technique in car anti-collision system. The development of digital signal process (DSP) has not only made the Fourier tranform faster, but also strengthen the real-time capability of frequency modulation continuous wave radar in distance measuring. And the circuit has become even simpler.In the first two chapters, it introduces how FMCW radar system works and its characteristics which are very useful to car anti-collision detection. Then it proposed a problem that when the radar is measuring more than one target. So the goal of this article is to solve this problem and give out a solution for the car anti-collision system. After analyzed two kinds of method for spectrum-matching, it combines the advantages of these two methods and forms a new way of multiple targets detection. After solved the mutiple target detection problem, it presents a complete solution for car anti-collision system using FMCW radar technology. And it gives every detail on each block of the system, including false target detection, waveform generator and so on.At present, the development of car anti-collision system is equal to the development of FMCW radar system. Many experts are trying to develop superior and stable products. This research shows that digital signal process technique will be more and more inomportant in FMCW target distance detection systems.更多还原