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硕士论文-数字化雷达信号处理技术研究，正文共60页。
【摘要】 脉冲压缩技术可以较好的解决雷达距离分辨力和作用距离之间的矛盾,但是雷达接收机接收到的目标回波经过脉冲压缩后会出现较大的旁瓣,如果旁瓣过大则会把临近单元微弱信号淹没,导致雷达检测性能下降,本文结合原有的旁瓣抑制算法,给出一种基于LMS (Least Mean Square)算法及窗函数修正算法的旁瓣抑制方法,进行旁瓣抑制。通过仿真验证本文提供的方法可以有效地抑制旁瓣。雷达回波中不可避免会有杂波的存在,如果雷达接收机接收的杂波幅度过大,将会淹没弱小的目标信号,这将会导致雷达检测性能下降,因此杂波抑制也是雷达信号处理中的重要组成部分。本文给出一种在无杂波图以及对消系数可供参考的情况下进行杂波对消的方法—基于多普勒相位补偿的AMTI,主要是针对运动杂波的抑制,并且对淹没在运动杂波中运动目标有较好的检测能力。通过仿真验证本文提供的方法可以有效地抑制运动杂波并能检测出淹没在其中的运动目标信号,并且在只有杂波的情况下也可以有效地抑制杂波。在本文中应用ADSP-TS101硬件芯片及其开发软件,实现了雷达接收回波信号的脉冲压缩、固定目标对消、自适应杂波对消以及非相参积累。
【Abstract】 Pulse compression technology can solve the conflict between the range resolution and the distance of radar detection, but many sidelobes will appear after the compression of echo signals. If the sidelobes are taller, the weak signals of the near units will be submerged. This will result in the degradation of the radar detection performance. This paper presents a sidelobe suppression method based on LMS algorithm and window function modified algorithm. By simulation, this method can effectively suppress the sidelobes.The clutter inevitably exists in the radar echoes, if the amplitude of the clutter is taller than that of target signal, the target signal will be submerged in the clutter, this will result in the degradation of radar performance, so the clutter suppression is a more important part of the radar signal processing. This paper provides a method of clutter suppression whose name is AMTI based on Doppler phase compensation in the absence of clutter map and cancellation coefficients. This method is mainly used to suppress moving clutter, it can improve the performance of radar in detecting the moving targets submerged in moving clutter. By simulation, the AMTI based on Doppler phase compensation can effectively suppress the moving clutter and detect the target submerged in the clutter, it also effectively suppress the moving clutter in the case that there is only moving clutter.In this paper, the ADSP-TS101 chip and its software for development are used to achieve the pulse compression, fixed targets cancellation, adaptive clutter cancellation and non-coherent accumulation.
【关键词】 脉冲压缩； 杂波抑制； 多普勒频率； 自适应杂波对消； ADSP-TS101；
【Key words】 pulse compression； clutter suppression； Doppler frequency； adaptive clutter cancellation； ADSP-TS101；
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- 硕士论文-数字化雷达信号处理技术研究
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