摘 要:本论文对目前在雷达信号处理系统中应用较为广泛的脉冲压缩技术进行了介绍,主要是线性调频的脉冲压缩信号。首先对脉冲压缩的概念以及雷达的工作原理进行了介绍,其次介绍了线性调频脉冲压缩技术的基本原理,以此为基础仿真生成了线性调频信号,并对其频域特性进行了详细的分析;其次对线性调频信号的匹配滤波器进行了研究,并分析比较了在白噪声下通过匹配滤波器的线性调频信号的波形;最后在MATLAB6.5平台上对线性调频脉冲压缩雷达进行了仿真。利用线性调频信号具有大带宽、长脉冲的特点,宽脉冲发射已提高发射的平均功率并保证足够的作用距离;而接受时采用相应的脉冲压缩算法获得窄脉冲已提高距离分辨率,较好的解决了雷达作用距离和距离分辨率之间的矛盾。57708
毕业论文关键词:雷达仿真,线性调频,脉冲压缩,匹配滤波器,白噪声
Abstract:This paper mainly introduced the linear frequency modulated pulse compression signal, which has been widely applied in radar signal processing system and pulse compression technology. Firstly, the concept of pulse compression and the working principle of radar are introduced in this paper, and it introduces the basic principle of the linear frequency modulation pulse compression technology, which the simulation to generate the linear frequency modulation signal is based on, and analyzes the frequency domain characteristics in detail; Secondly, it mainly do research on the matched filter of linear frequency modulation signal, and compares with matched filter of linear frequency modulation signal waveform in the white noise; Finally, it simulates the linear frequency modulation pulse compression radar in MATLAB6.5 platform. The characteristics of long pulse width of pulse firing has raised the average power to ensure enough emission range; and the corresponding pulse compression algorithm to when accepting obtain the narrow pulse has improve the range resolution, they are all better solved the contradiction between the radar range and range resolution.
Key words:Radar simulation,chirp,pulse compression,Matched filter
目录
1 引言 4
1.1 脉冲压缩的概念 4
1.2 雷达工作原理 5
2 设计原理 7
2.1 匹配滤波器原理 7
2.2 线性调频脉冲信号 8
2.3 线性调频脉冲压缩的基本原理 11
3 雷达LFM脉冲压缩设计 14
3.1 线性调制信号和噪声的生成 14
3.2 设计结果 16
3.3 设计分析 19
结论 21
参考文献 22
致谢 23
附录 24
1 引言
随着雷达技术的迅猛发展,对雷达的作用距离、分辨能力和测量精度等的要求也越来越高。我们知道按雷达信号的分辨理论。在保证一定信噪比并实现最佳处理的前提下,测量精度和分辨力对信号形式的要求完全一致:测距精度和距离分辨力主要取决于信号的频率结构,他要求信号具有大的带宽、测速精度和速度分辨力取决于信号的时间结构,他要求信号具有大的时宽。因此,理想的雷达信号应具有大的时宽带宽乘积。大时宽保证了速度分辨力,大带宽则保证了距离分辨力。但是大时宽和大带宽往往不可兼得。也就是说,测距精度和距离分辨力以及测速精度和速度分辨力之间存在着不可调和的矛盾。