近程脉冲雷达关键技术研究

【作者】 陆珺；

【导师】 王志华；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2008， 硕士

【摘要】 近年来,随着现代武器和飞行技术的发展,对雷达的作用距离、分辨率等性能指标提出了更高的要求。脉冲压缩雷达作为一种新的雷达体制,大大地提高了雷达的距离分辨率,并有效地解决了雷达距离分辨率与作用距离之间的矛盾。本文针对500米定高近程雷达项目所提出的任务要求,确定了线性调频脉冲压缩工作体制,在此基础上选择了合适的雷达技术参数。线性调频信号是一种现代雷达系统中应用最广泛的大时宽积信号,其频谱宽度和脉冲宽度都可以独立选取,可获得高测距精度。本文从雷达脉冲压缩的基本概念入手,对典型的线性调频脉冲压缩信号的时频特性做了较为深入的研究。介绍了脉冲压缩的两种实现方法:时域实现和频域实现,并对加权处理作了简单分析。为验证方案正确性,本文采用了雷达系统仿真建模的基本思想。与现场试验相比,雷达系统仿真具有经济性、灵活性、可重复性、可继承性等优点。利用MATLAB/Simulink仿真平台对线性调频脉冲压缩雷达系统进行了仿真,研究并搭建了雷达的各个功能模块的仿真模型,并做了一定的仿真测试和研究分析,验证了系统设计的正确性和可行性,为系统实现提供了依据。更多还原

【Abstract】 In recent years, with the development of modern weapon and flight, the radar’s range, resolution and other performance claims a higher demand. Radar pulse compression as a new radar system, greatly improves the radar’s range resolution, and has resolved the contradiction between action distance and range resolution.This paper contrives a LFM pulse compression work system scheme by the mission requirements according to a 500-meter short-range radar project. On this basis, the corresponding radar technical parameters are selected.LFM signal is a kind of big product of band-width and time-width by nonlinear phase modulation. It is a widely used technique in radar applications. The band-width and time-width of LFM signal could be independent chosen to obtain good distance resolution. Then the paper introduces the two pulse compression methods: time domain and frequency domain, and brief analysis the weighted.To verify accuracy of the scheme, the paper uses the basic idea of the radar system simulation. Compared with field tests, the technique of radar system simulation has many advantages, such as economical efficiency, flexibility, repeatability, inheritability and so on. Then, we utilize Simulink to design the LFM pulse compression radar system, establish and study the simulation models of all the function blocks. After some simulation testing and analysis, it has confirmed the system design’s accuracy and provided feasible references to practice.更多还原