【作者】 韩放；

【导师】 谢红；

【作者基本信息】 哈尔滨工程大学 ， 通信与信息系统， 2007， 硕士

【摘要】 脉冲多普勒雷达是一种新体制的雷达，其信号非常复杂，是一种广泛被采用的全相参体制的雷达，它利用目标与雷达之间相对运动而产生的多普勒效应进行目标信息提取和处理，具有较高的速度分辨率，可以有效地抑制极强地杂波的干扰问题。随着雷达技术的不断发展，脉冲多普勒雷达得到了越来越广泛的应用，绝大多数机载雷达都采用脉冲多普勒体制。本论文研究了PD雷达信号处理各环节技术，该过程能有效屏蔽掉与回波信号相位无关的干扰信号，通过仿真该过程确定目标相关信息。本文从PD雷达的工作原理出发，研究了脉冲多普勒雷达模糊问题。讨论了PD雷达的相参性、脉内调制等信号特征。根据LFM信号处理相关研究成果，结合LFM雷达系统的实际需求，研究了LFM信号处理的算法与实现。根据雷达参数建立了目标、杂波模型。以Matlab为仿真平台，对含杂波与噪声的回波信号进行仿真。利用回波信号进行了脉冲压缩、旁瓣抑制、MTD、多脉冲积累以及CFAR等相参雷达信号处理算法仿真和分析。对杂波抑制算法和恒虚警检测算法作了较为深入地研究。针对高重频距离门体制中，输入信号实现频域滤波后在相邻多普勒滤波器组之间会发生频谱泄漏的情况，提出了一种更为有效和准确的速度定心算法，通过改变多普勒频移参数设置，仿真了该准则的正确性和全面性。针对检测过程中经常遇到的边缘效应，改进实现了一种能够适应突现杂波环境中的快门限CFAR检测方案，有效缓解了杂波边缘内侧虚警概率过高和外侧恒虚警损失严重的问题。根据理论研究和计算机仿真，取得了令人满意的结果。更多还原

【Abstract】 The Pulse-Doppler radar is a new type of radar system. Its signal is very complex. It is widely used, which utilizes the Doppler Shift between the target and the radar to have the target information processed. It can efficiently solve the interference of the ground clutter. With the development of radar technology, PD radar has had more and more widely application, mostly airborne radars use such system.This thesis discusses the key technique of the Pulsed Doppler radar signal processing. The signal processing is discussed in correlative radars. They can restrain jamming signals and clutters which are irrelative with the radar echoes. By the simulation targets’ images can be got.The thesis starts from operation principle of PD radar. We discuss the ambiguity resolution of Pulsed Doppler radar. Based on the relevant research results and real demands in LFM radar, this dissertation involves the LFM signal algorithm theory study and realization and its signal features, for instance, coherence, inside pulse modulation character. This dissertation presents an analysis and a research on the modeling and simulation of various kinds of PD radar environment signals, such as target echo, background clutter. Based on radar echo model and radar operating parameters, target and clutter data were simulated by Matlab platform in advance and the pulse compression, side lobe cancellation, clutter suppression, multi pulse accumulation and CFAR of coherent Radar signal processing are introduced and simulated.Specially we study the algorithm and the capability of PD radar’s clutter suppression and signal detection. In high-frequency distant system, leak of frequency power will happened in border upon filter after the signal gets cross the filter in frequency domain. We bring forward a more available and exact speed local arithmetic. Simulation results are provided trough changing the parameter of Doppler frequency shift. Aiming at the appearance of edge effect during signal detection, A new method of nimble CFAR which can adapt the environment of multi clutters. Based on the theoretic analysis and computer simulations, pleased results are achieved.更多还原