多普勒天气雷达信号处理的研究

发布时间：2018-04-16 14:01

本文选题：天气雷达 + 多普勒天气雷达　；参考：《安徽大学》2014年硕士论文

【摘要】：本文针对常规天气雷达和多普勒天气雷达做了相关介绍,特别是对常规雷达和多普勒天气雷达的信号处理算法进行了深入的探讨,从算法和硬件设计上寻求突破,已达到更好的设计性能。首先,讨论了常规天气雷达的发展以及国内外研究水平概况,以及选题的研究背景和意义,介绍了常规雷达的探测原理,影响云雨雷达测量的因素等。还介绍了新一代多普勒天气雷达的发展以及国内外研究水平概况,以720A为例,阐述了天气雷达各个分系统的功能与实现原理图,并详细说明了新一代多普勒天气雷达信号处理的特点。其次,通过总结分析和查阅相关文献,提出了将chirp-z变换算法应用到天气雷达信号处理上,通过Matlab仿真,说明了其对新一代天气雷达的信号处理有着更好的谱分析能力,和传统FFT算法对比,运算结果的精度得到了明显的提高。而且运算量也有所减少。最后,介绍了FFT算法的FPGA设计,设计实现了基于一种模块化设计的FFT算法。设计采用顺序结构,各单元在中央控制单元的控制下顺序工作。使用了一块双口RAM作为中间结构存储器。蝶形处理部分采用快速复数乘法运算,减少了乘法的运算次数,提高了运算速度,节省了芯片资源。蝶形处理采用整数运算,每次运算存在一定误差,且随着运算级数的增多,误差会随之增大。本设计还采用简易快捷的地址生成逻辑。这为FFT变换算法应用到新一代多普勒雷天气雷达信号处理系统上做了很好地铺垫。
[Abstract]:In this paper, the conventional weather radar and Doppler weather radar are introduced, especially the signal processing algorithms of conventional weather radar and Doppler weather radar are discussed in depth, and a breakthrough in algorithm and hardware design is sought.Better design performance has been achieved.Firstly, the development of conventional weather radar and the research level at home and abroad are discussed. The research background and significance of the topic are also discussed. The detection principle of conventional radar and the factors influencing the measurement of cloud and rain radar are introduced.This paper also introduces the development of new generation Doppler weather radar and the general situation of research level at home and abroad. Taking 720A as an example, the function and realization principle of each subsystem of weather radar are described.The characteristics of the new generation Doppler weather radar signal processing are described in detail.Secondly, through summing up and analyzing and consulting relevant literature, this paper puts forward the application of chirp-z transform algorithm to weather radar signal processing. Through Matlab simulation, it shows that it has better spectral analysis ability for the new generation weather radar signal processing.Compared with the traditional FFT algorithm, the accuracy of the algorithm is improved obviously.And the amount of computation has also been reduced.Finally, the FPGA design of FFT algorithm is introduced, and the FFT algorithm based on modular design is designed and implemented.The design adopts sequential structure and each unit works sequentially under the control of central control unit.A dual port RAM is used as the intermediate structure memory.Butterfly processing adopts fast complex multiplication, which reduces the number of times of multiplication, improves the speed of operation and saves the chip resources.The butterfly processing uses integer operation, each operation has a certain error, and with the increase of operation series, the error will increase.This design also adopts simple and fast address generation logic.This provides a good basis for the application of FFT transform algorithm to the new generation Doppler radar signal processing system.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51

【参考文献】