超高声速目标回波的产生与处理

发布时间：2018-03-31 09:06

本文选题：超高声速　切入点：时间压缩　出处：《南京理工大学》2017年硕士论文

【摘要】：随着超高声速飞行器的迅猛发展,超高声速目标探测雷达的研制也越来越迫切。雷达系统的核心是信号处理算法,研究快速有效的超高声速目标回波处理算法是必要的。研制一款雷达需要测试,而使用实际飞行器测试一款超高声速目标探测雷达成本巨大。因此使用雷达目标模拟器模拟超高声速目标信号的方法得到了广泛应用。本文围绕超高声速目标回波的产生方案和处理算法两方面内容展开论述。本文首先通过数学推导建立一般速度条件下的回波数学模型,再推广到超高声速情况,指出超高声速条件下目标回波的特征是其时间压缩效应不能忽略;其次根据超高声速目标回波数学模型讨论其产生方案,表明最关键的问题是时间压缩的模拟,并围绕此问题展开论述;然后分析超高声速目标回波对信号处理的影响是存在距离走动,研究基于keystone变换的距离走动校正算法;接着根据本文阐述的超高声速目标回波产生方案论述基于FPGA的超高声速目标回波模拟器的设计与实现;最后使用本文研究的超高声速目标回波处理算法处理模拟器产生的数据,验证模拟器工作的正确性,证明回波产生方案的可行性。
[Abstract]:With the rapid development of ultra-high sound vehicle, the development of ultra-high sound target detection radar is becoming more and more urgent. The core of radar system is signal processing algorithm. It is necessary to study a fast and effective algorithm for the processing of ultra-high sound velocity target echo. It is necessary to develop a radar that needs to be tested. However, it is very expensive to test an ultra-high sound target detection radar by using an actual aircraft. Therefore, the method of using radar target simulator to simulate ultra-high sound target signal has been widely used. This paper revolves around ultra-high sound velocity target return. The generation scheme and processing algorithm of wave are discussed in this paper. Firstly, the mathematical model of echo under general velocity condition is established by mathematical derivation. It is pointed out that the characteristic of target echo under ultra-high sound velocity is that the time squeezing effect can not be ignored. Secondly, according to the mathematical model of ultra-high sound velocity target echo, the generating scheme is discussed. It is shown that the most critical problem is the simulation of time compression, which is discussed in detail, and then the range walk correction algorithm based on keystone transform is studied by analyzing the influence of ultra-high acoustic target echo on signal processing. Then the design and implementation of ultra-high sound target echo simulator based on FPGA are discussed according to the scheme of ultra-high sound velocity target echo generated in this paper, and the data generated by simulator are processed by using the algorithm of ultra-high sound velocity target echo processing studied in this paper. The correctness of the simulator is verified and the feasibility of the echo generation scheme is proved.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN957.51

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