节点文献
基于FPGA的宽带信号实时脉冲压缩系统设计
【作者】 邓军；
【导师】 贺知明；
【作者基本信息】 电子科技大学 ， 信号与信息处理， 2010， 硕士
【摘要】 在匹配滤波器理论基础上,使用在宽脉冲内附加线性调频的方法可以扩展信号的频带,使信号的时宽带宽积大于一。在很大程度上解决了雷达作用距离和分辨力上的固有矛盾,使得脉冲压缩技术在雷达等系统中有着广泛的应用。随着CPLD和FPGA技术和工艺的高速发展,使用FPGA实现脉冲压缩系统相对于DSP器件的优势越来越大。利用FPGA在硬件上实现信号的脉冲压缩处理具有更高的效率和更低廉的成本,并且可以在其中整合更多的功能,已经成为了现代雷达对信号进行脉冲压缩处理的必然趋势。宽带信号的高抗干扰能力,高分辨率,携带信息能力强,与背景噪声相关性弱的特点使其在现代雷达中得到了广泛应用,使用宽带信号乃至超宽带信号也是现代雷达发展的一个必然趋势。本文根据线性调频信号实现脉冲压缩的基本原理,设计了一个对线性调频宽带信号进行脉冲压缩处理的系统。并通过FPGA设计实现了一个雷达宽带信号实时脉冲压缩处理系统,达到了系统的预定指标。本文的主要工作有:1.分析了信号实现脉冲压缩的基础理论,对线性调频信号实现脉冲压缩所需要进行的处理进行了逐一分析。2.根据给定的指标对信号进行了分析,确定了对给定信号进行脉冲压缩所需要的ADC,数字下变频模块,脉冲压缩模块具体指标,简单分析了实现系统所需使用的IP Core。3.设计了一个宽带信号实时脉冲压缩处理系统,对其进行了全面的仿真测试,并且对测试结果进行了相应分析。
【Abstract】 Based on the theory of the matched filter, the bandwidth-duration product of the signal can be made greater than one, by the way of using the pulse width to add to the method of LFM signal band. In this way, the intrinsic contradiction of the radar horizon and the radar resolution can be largely solved, so that the pulse compression technique is widely used in the radar system. With the development of the technology of CPLD and FPGA, using FPGA to achieve pulse compression system is more and more advanced than the DSP devices. Using FPGA to achieve the pulse compression system will have higher efficiency and with lower costs, and can be able to hang with the other functions.Using FPGA achieve the pulse compression system has become inevitable. The wideband signals which have high anti-interference ability, the ability of high resolution, information-bearing ability, and weak correlation with background noise is widely used in modern radar. The use of the wideband signals is also an inevitable trend of the modern radar.Based on the basic principle of the pulse compression of the LFM signal, a signal processing system to achieve the real-time processing of the wideband signal was designed.The system was implemented by using FPGA, and reached the target.The main work is summarized as follows:1. The basic theory of linear frequency modulation signal (LFM) was analyzed. The processings of signals which are used in to achieve pulse compression processing were analyzed.2. Based on the analysis of the given target, the ADC, DDC and pulse compression which were used to achieve the pulse compression processing of the target signal, and the uses of the IP Core which were used to achieve the system were introduced.3. A wideband real-time signal pulse compression system was designed, and some comprehensive tests were made. Based on the tests, the analysis of the system was gived at last.