高速目标的跨距离门长时间积累研究

发布时间：2018-03-28 23:35

本文选题：高速目标　切入点：跨距离门走动　出处：《南京理工大学》2014年硕士论文

【摘要】：现代雷达面临的一个日益重要的挑战是如何提高雷达检测低可观测目标的性能。对雷达信号进行长时间积累以增加实际利用的信号能量,是有效提高在极为复杂的环境下雷达对高速运动目标的检测性能的有效途径之一,因而是国内外学者研究的热点。本文以高速运动目标为研究对象,详细研究了其回波信号跨距离门走动时的长时间积累技术。首先建立了雷达发射信号模型、回波信号模型,讨论了传统雷达信号处理技术,通过公式推导和Matlab仿真验证了高速运动目标对传统积累算法检测性能的影响。然后在目标速度已知和未知的两种情况下,分别研究运动补偿算法。在可获得较精确速度的情况下,可以利用包络插值移位补偿算法、频域校正补偿算法完成距离走动补偿。在无法获得目标速度的情况下,可以用keystone变换算法校正距离走动,本文讨论了4种keystone变换的实现方法：sinc插值法、DFT-IFFT算法、CZT算法、CZT-IFFT算法。文中研究了上述算法的公式推导,对单目标、多目标的场景分别进行Matlab仿真验证算法的有效性,并在不改变雷达参数的条件下,通过仿真得到能有效检测高速目标的信噪比条件,最后做了运算量比较。
[Abstract]:One of the increasingly important challenges facing modern radar is how to improve the performance of radar detection of low observable targets. It is one of the effective ways to improve the detection performance of radar to high speed moving target in extremely complex environment, so it is a hot research topic of domestic and foreign scholars. In this paper, the long time accumulation technology of echo signal moving across the range gate is studied in detail. Firstly, the radar transmit signal model, echo signal model and traditional radar signal processing technology are established. The effect of high speed moving target on the detection performance of traditional accumulation algorithm is verified by formula derivation and Matlab simulation. The motion compensation algorithms are studied separately. When the accurate velocity can be obtained, the envelope interpolation shift compensation algorithm and the frequency-domain compensation algorithm can be used to complete the range walk compensation. In the case of the target velocity can not be obtained, The keystone transform algorithm can be used to correct the range walk. In this paper, we discuss four kinds of keystone transform realization methods: SINC interpolation method and DFT-Ifft algorithm / CZT-Ifft algorithm. In this paper, the formula derivation of the above algorithm is studied, and the single target is studied. The multi-target scene is simulated with Matlab to verify the effectiveness of the algorithm, and without changing radar parameters, the signal-to-noise ratio (SNR) conditions of high-speed targets can be effectively detected by simulation. Finally, the computational complexity is compared.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51

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