摘要在复杂背景下保持恒定虚警率的情况下从雷达回波中提取目标回波信号既是雷达检测技术的关键也是其重要指标。本文主要的研究要点是对复杂背景下的杂波进行建模仿真以及对杂波信号进行相应的恒虚警率处理。80409

本文首先分析了雷达信号的产生机理，建立了雷达发射信号模型并仿真出雷达的发射信号进行了仿真。紧接着对杂波信号进行统计学分析，研究了杂波的统计学特性及其产生机理使用零记忆非线性变换法对瑞利分布、对数正态分布、韦布尔分布、K分布杂波进行了仿真，并将仿真结果与理论值进行对比验证仿真数据的准确性。

接着研究了有序统计量类和可变指示类恒虚警算法在韦布尔分布和K分布复杂杂波背景下的检测性能，对不同的信杂比的情况下雷达的检测概率进行了仿真。并对复杂背景进行介绍，分析这两种恒虚警算法的在复杂背景下的检测性能。

最后，对本文的工作进行总结，分析了这些算法的不足并提出了改进的意见。

毕业论文关键词  杂波建模  统计学分析  OS-CFAR  VI-CFAR  复杂背景

毕业设计说明书外文摘要

Title    Research on radar constant false alarm rate     in complex background                       

Abstract Maintaining constant false alarm rate in complex background when got target echo signal from the radar echo is not only a key in radar detection technology, but also an important indicator。 In this thesis, how to simulate the clutter under the complicated background and process clutter signal with constant false alarm rate is concerned。 

The principle of producing transmit signal on radar is analyzed firstly。 Then the model of radar transmitted signal is set up and the emitted radar signal is simulated to prepare for the following work, and also the clutter in statistics is analyzed。 The way of zero-memory nonlinear is used to establish the Rayleigh, Lognormal, Weibull and K distribution clutter simulation waveform based on statistical characteristics of clutter, and then compared the simulation results with the theoretical value to verify the correctness。

Besides, the performance of ordered statistics and variable indicate CFAR Algorithm in Weibull and K distribution clutter background is concerned。 And also detection probability curve in different SNR of radar is made, as the detection performance indicators to be analyzed。 And the detection performance of these two CFAR algorithm is analyzed in complex background。

Finally, the work of this thesis and analyzed the shortcomings of these algorithms is summarized and suggestions for improvement is made。

Keywords  model clutter  statistical analysis  OS-CFAR  VI-CFAR  complex background

目  次

1   绪论 1

1。1  研究的背景及意义 1

1。2  国内外研究现状 2

1。3  论文的主要工作安排 3

2   信号的建模、产生 5

2。1  雷达工作原理 5

2。2  线性调频信号 6

2。3  线性调频信号的脉冲压缩 7

3 杂波信号的建模、产生 9

3。1  瑞利杂波 9

3。2  对数正态分布模型