雷达脉冲压缩技术的研究

发布时间：2018-03-15 05:37

  本文选题：脉冲压缩　切入点：数字下变频　出处：《哈尔滨工程大学》2014年硕士论文　论文类型：学位论文

【摘要】：脉冲压缩技术能有效的解决目标的探测距离、距离分辨力和速度分辨力矛盾的问题,而被广泛的应用于现代雷达信号处理中。随着FPGA和CPLD器件的不断发展,其数字信号处理性能的不断提升,利用FPGA来实现雷达的数字脉冲压缩成为一种主流趋势。本文首先对脉冲压缩系统的发展及现状进行了分析,介绍了脉冲压缩系统的相关原理,其主要包括数字下变频技术、线性调频信号的脉冲压缩技术和距离旁瓣的抑制方法;对于线性调频信号、非线性调频信号和相位编码信号进行了优缺点对比,根据实际需要选用线性调频信号实现脉冲压缩。随后对比分析了两种实现数字脉冲压缩的方法,选用频域的脉冲压缩方案实现脉冲压缩系统,通过理论分析选定合适的线性调频信号参数,采用MATLAB仿真软件进行了系统仿真验证,并分析了噪声对脉压系统的影响。对于硬件实现部分,采用结构化的设计思想对脉压系统进行功能模块的划分,通过调用FPGA IP core和VHDL语言编程设计模块的方法实现脉冲压缩系统,对于硬件实现系统的方案进行了详细的介绍。最后通过MATLAB与Quartus Ⅱ联合仿真的方法对系统进行了功能测试。本文设计的数字脉冲压缩系统已经在EP2S60 ( EP2S60F672C5ES )平台上获得实现,通过实验测试,实际脉压系统的脉压结果良好,性能指标达到了设计要求。
[Abstract]:Pulse compression technology can effectively solve the problem of target detection distance, range resolution and velocity resolution, which is widely used in modern radar signal processing. With the development of FPGA and CPLD devices, With the improvement of digital signal processing performance, it has become a mainstream trend to use FPGA to realize the digital pulse compression of radar. Firstly, the development and current situation of pulse compression system are analyzed, and the related principle of pulse compression system is introduced. It mainly includes digital down-conversion technology, pulse compression technology of linear frequency modulation signal and suppression method of range sidelobe, and compares advantages and disadvantages of linear frequency modulation signal, nonlinear frequency modulation signal and phase coded signal. According to the actual needs, the linear frequency modulation signal is selected to realize pulse compression. Then, two methods to realize digital pulse compression are compared and analyzed. The pulse compression system is realized by using frequency domain pulse compression scheme. Through theoretical analysis, the suitable parameters of LFM signal are selected, the system simulation is verified by MATLAB software, and the influence of noise on pulse compression system is analyzed. The function modules of pulse compression system are divided by structured design idea, and the pulse compression system is realized by calling FPGA IP core and VHDL language programming design module. The hardware implementation scheme of the system is introduced in detail. Finally, the function of the system is tested by the method of MATLAB and Quartus 鈪，

本文编号：1614684