新一代外贸155多普勒测速雷达实时信号处理系统的设计与实现

发布时间：2018-03-19 05:01

  本文选题：多普勒测速雷达　切入点：FPGA　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：新一代外贸155多普勒测速雷达是测量155mm自行火炮弹丸初速的重要仪器,数字信号处理系统是其重要组成部分。随着对雷达测速精度要求的不断提高,研发实时、高效、精度高的测速雷达数字信号处理系统具有十分重要的意义。本文就是研究并实现了基于FPGA的新一代外贸155多普勒测速雷达实时信号处理系统。本文依据新一代外贸155多普勒测速雷达的应用场景,在分析其工作原理的基础上,探讨了传统频谱分析方法对测速精度的影响,通过分析比较Zoom-FFT、Rife和CZT三种高精度测频算法,提出了一种基于FFT-CZT联合算法的频率估计方案。经过对FFT-CZT联合算法和传统谱分析法的仿真比较,验证了所提出方案可以有效地提高系统的频率估计精度。在硬件实现上,根据新一代外贸155多普勒测速雷达系统的要求,本文提出一种基于FPGA的多普勒测速雷达实时信号处理系统的实现方案。采用Altera公司的Cyclone Ⅲ系列中的EP3C25F256I7芯片,完成系统中数据的高速缓存、FFT-CZT联合算法的硬件实现以及FPGA与ARM处理器的数据接口设计。并对其系统性能进行测试和误差分析,测试结果表明本系统可以实现测速雷达多普勒信号的实时、高速、高精度的处理。
[Abstract]:A new generation of foreign trade 155 Doppler velocimetry radar is an important instrument for measuring the initial velocity of 155mm self-propelled artillery projectile, and the digital signal processing system is an important part of it. The high precision digital signal processing system of speed measuring radar is very important. This paper studies and implements a new generation of foreign trade 155 Doppler velocity radar real time signal processing system based on FPGA. The application scene of ma-155 Doppler velocimetry radar, Based on the analysis of its working principle, the influence of the traditional spectrum analysis method on the accuracy of velocity measurement is discussed, and three kinds of high precision frequency measurement algorithms, Zoom-FFT FT-Rife and CZT, are analyzed and compared. A frequency estimation scheme based on FFT-CZT joint algorithm is proposed. The simulation results of FFT-CZT joint algorithm and traditional spectral analysis show that the proposed scheme can effectively improve the accuracy of frequency estimation of the system. According to the requirements of the new generation of foreign trade 155 Doppler velocimetry radar system, this paper presents a scheme of real-time signal processing system of Doppler velocimetry radar based on FPGA. The EP3C25F256I7 chip of Cyclone 鈪，

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