-
摘要随着雷达技术的快速发展，现代战争对雷达的要求越来越高。它要求雷达信号不容易被电子环境监测器（ESM）和反辐射导弹（ARM）这些装置发现并跟踪，同时能够从干扰中检测到目标。这就需要用到低截获概率（LPI）技术。采用大时宽带宽积的信号可以使其不易被敌方接收机截获，从而使雷达具备更高的生存能力。
- 上一篇：基于FPGA的盲人小助手障碍物识别系统设计
- 下一篇：旋转图像的叠加与平移快速拼接算法
本文首先介绍了脉冲雷达原理并通过LPI雷达的概念和截获因子表示式介绍了低截获原理,随之分析了雷达参数对低截获概率因子的影响。接着讨论了LFM、Barker和LFM+Barker组合码的波形特性，并仿真分析了这三种宽带信号的模糊度。最后用解线调和循环谱密度两种接收机常用的方法仿真分析了三种信号的低截获性能，仿真结果表明LFM+Barker组合信号具有最优的低截获性能。
关键词 低截获概率 波形设计 解线调 循环谱密度19795
毕业设计说明书（论文）外文摘要
Title Analysis of Low Probability of Interception Performance of Broadband Radar Waveform
Abstract
With the rapid development of radar technology, radar needs higher and higher properties to fit the modern war. The radar signals must be uneasy to be found and tracked by electronic environment monitor (ESM) and anti-radiation missile (ARM) , at the same time they can detect targets from interference. So it would require the use of low probability of intercept (LPI) technology. Using signals of big time-bandwidth product ,they are uneasy to be intercepted by enemy receiver, so as to improve the survivability of the radar.
This paper introduces low probability of intercept principle through the concept of LPI radar and the expression for the intercept factor after introducing the principle of pulse radar ,and analyzes the influence of radar parameters to intercept factor. Then we discuss the features of LFM, Barker and LFM + Barker waveform, and simulate and analyze the ambiguity of these broadband signals. Finally we use two commonly used methods for receiver including solution of linear modulation and cyclic spectrum density analysis to analyze the low probability of three signals. The simulation results show that the LFM+Barker code has optimal low probability of intercept performance.
Keywords low probability of intercept ,Waveform design
solution of linear modulation, cyclic spectrum density
目 次
1 绪论 1
1．1 研究背景及意义 1
1．2 研究现状 2
1．3 论文主要内容与章节安排 3
2 脉冲雷达原理和低截获原理 5
2．1 引言 5
2．2 脉冲雷达基本原理 5
2．3 低截获原理 5
2．4 本章小结 9
3 宽带雷达波形设计 11
3．1 引言 11
3．2 模糊函数的定义 11
3．3 线性调频信号(LFM) 12
3．4 相位编码信号 15
3．5 组合捷变信号 18
3．6 本章小结 21
4 雷达波形的低截获性能分析 22
4．1 引言 22
4．2 基于解线调的截获方法 22
4．3 基于循环谱密度的截获方法 25
4．4 本章小结 29