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时频分析在多普勒雷达多目标测量中的应用研究

Research and Application of Time-Frequency Analysis in the Multi-targets Measuring of Doppler Radar

【作者】 王晓宇

【导师】 杨莘元;

【作者基本信息】 哈尔滨工程大学 , 信号与信息处理, 2005, 硕士

【摘要】 以时频分析为主要算法是目前多普勒测速雷达核心算法的一次比较大的革新。它潜在的用途主要是靶场测量。对于这种雷达的理论算法进行深入研究是非常有意义的。本论文的所有工作都是围绕多普勒测速雷达的理论和算法而展开的。 本文工作的第一大部分是本文的基础部分。我们详细阐述了多普勒测速雷达的测速原理,并在分析了雷达回波信号的特性后建立了运动目标回波信号的数学模型。由此,引出了用时频方法来进行雷达信号处理。由于时频方法是本文的理论基础,我们在本部分也详细介绍了时频方法的基本概念及性质。本部分主要包括论文的第二、三章。 在本文工作的第二大部分,我们在详细分析了测速对象特性的基础上,根据其特点提出了基于时频分析方法的目标检测方法。在分析了几种典型时频分析方法的优缺点的基础上,分别用实测数据进行了仿真,并比较了仿真结果。最终,在考虑了工程实现的简便性、仿真结果的有效性的情况下,认为短时傅立叶分析是相对最优的。本部分主要包括论文的第四章。 本文工作的第三大部分是对目标进行检测和参数估计。我们采用Radon—STFT方法对雷达回波信号进行检测。结合“CLEAN”技术,实现对模拟的雷达回波信号进行分离和参数估计,得到了令人满意的结果。本部分主要包括论文的第五章。 在论文的最后对全文进行了总结,并且指出了进一步的工作展望。

【Abstract】 Time-Frequency Analysis algorithm is regarded as a great revolution to the core algorithm of doppler speed radar. It can be used in such areas as target range. So it is very important to do research on the theory, algorithm. In this paper, all of our work surrounds these problems.The first part of our paper’s work is the basic of the paper. We give the theory of the Doppler speed radar, and build the mathematical model of high-speed target echo signal. So we decide take Time-Frequency Analysis algorithm to process radar signal. We also introduce the basic concepts and characters of Time-Frequency Analysis algorithm. This part includes chapter 2,3,4.In the second part of our paper’s work, we put forward target detection method based on TFA (Time-Frequency Analysis) according to the characteristics of targets. Based on the characteristics of some typical TFA, we simulate these methods with observed data and compare the results. When implementation simplification and simulation results are considered, STFT(Short Time Fourier Transform) is showed to be a comparatively better method. This part includes chapter 5.The second part of our paper’s work is detection and parameter estimation of the targets. This paper introduces the method of doppler radar echo signals detection using Radon-STFT. Combined with CLEAN technique, the method can be used to simulating doppler radar echo signals separation and parameter estimation and gives the satisfied result.The general work of this paper is summarized and the further research direction is pointed out in the last chapter.

  • 【分类号】TN958
  • 【被引频次】20
  • 【下载频次】813
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