非线性调频波形抑制合成孔径雷达旁瓣干扰

论文摘要

本文针对合成孔径雷达成像中的干扰问题所涉及的关键技术提出新的解决方案,该方案通过非线性调频波形来有效地抑制旁瓣接收信号中的干扰成分。由于该非线性调频波形采用了频谱有效波形,因此能够提高系统的容量,同时能够通过选择功率有效波形来改善系统的工作效率。本文利用非线性调频波形实现对波形的设计,为了确定最佳的非线性调频波形设计方案,作者对十种热门非线性调频函数进行了详细的研究,并对其性能进行了分析与比较。本文借助MATLAB工具生成仿真所需的原始数据,干扰信号和多种SAR算法对应用于SAR的理想波形进行验证,并利用生成的非线性调频波形,反散射信号和基于雷达参数及环境数据的扩展目标对SAR成像技术进行仿真。仿真结果表明：本文所提出的非线性调频波形技术较传统波形能够进一步提高系统的有效性。

论文目录

• ABSTRACT
• 摘要
• CHAPTER 1 INTRODUCTION
• 1.1 MOTIVATION
• 1.3 OBJECTIVE AND SCOPE OF WORK
• 1.4 ARRANGEMENT OF THE THESIS
• CHAPTER 2 SYNTHETIC APERTURE RADAR IMAGING TECHNOLOGY
• 2.1 DEFINITION
• 2.2 HISTORY
• 2.3 PRINCIPLES OF SYNTHETIC APERTURE RADAR
• 2.3.1 SAR GEOMETRIC CONFIGURATION
• 2.3.2 SAR GEOMETRIC RESOLUTION
• 2.3.3 RADIOMETRIC RESOLUTION
• 2.3.4 THE THREE FUNDAMENTAL RADAR FREQUENCIES
• 2.3.5 INTERPRETING SAR IMAGES
• 2.4 SAR ADVANCED TECHNIQUES
• 2.4.1 INTERFEROMETRIC SYNTHETIC APERTURE （INSAR）
• 2.4.2 POLARIMETRIC SYNTHETIC APERTURE RADAR （POL-SAR）
• 2.5 SAR IMAGE PROCESSING
• 2.5.1 OVERVIEW OF IMAGE ALGORITHM FORMATION
• 2.5.2 SAR IMAGE PROCESSING
• 2.5.3 PLATFORM MOTION
• 2.5.4 PRF SELECTION
• 2.6 PULSE COMPRESSION
• 2.7 SAR EQUATION
• 2.8 SPECKLE REDUCTION
• CHAPTER 3 SYNTHETIC APERTURE RADAR ELECTRONIC COUNTERMEASURES（ECM）
• 3.1 INTRODUCTION
• 3.2 ELECTRONIC COUNTERMEASURES （ECM）
• 3.2.1 RADIATION JAMMING
• 3.2.2 RERADIATION JAMMING
• 3.2.3 Relfeetion Jamming
• 3.2.4 SELF-SCREENING JAMMERS （SSJ）
• 3.2.5 STAND-OFF JAMMERS （SOJ）
• 3.3 SAR JAMMING MEASURES
• 3.3.1 NOISE JAMMER VERSUS SAR SYSTEMS
• 3.3.2 NOISE JAMMER EFFECTIVENESS
• 3.3.3 NOISE JAMMER GENERATION
• 3.3.4 NOISE JAMMER WAVEFORMS
• 3.3.5 GENERATING FM NOISE JAMMER
• 3.3.6 SPECTRAL DENSITY OF THE FM NOISE JAMMER
• 3.4 GENERATING FM NOISE JAMMER BY MATLAB
• 3.5 JAMMING SAR WITH FM NOISE JAMMER
• 3.6 SUMMARY
• CHAPTER 4 STUDY OF WAVEFORM DESIGN AND SIDELOBE MITIGATION FORSAR
• 4.1 INTRODUCTION
• 4.2 SIDELOBE MITIGATION TECHNIQUES FOR SAR SYSTEMS
• 4.2.1 WEIGHTING WINDOWS
• 4.2.2 DUAL APODIZATION （DA）
• 4.2.3 SPATIALLY VARIANT APODIZATION （SVA）
• 4.2.4 LEAKAGE ENERGY MINIMIZATION （LEM）
• 4.3 SELECTION OF SIDELOBE MITIGATION TECHNIQUES
• 4.4 SELECTION OF NLFM WAVEFORM DESIGN
• 4.4.1 THE CONCEPT OF STATIONARY PHASE
• 4.5 DESIGNING A NONLINEAR FREQUENCY WAVEFORM
• 4.5.1 NLFM DESIGNING PRINCIPAL
• 4.5.2 Designing NLFM method
• 4.5.3 FREQUENCY MODULATED WAVEFORM SPECTRUM SHAPING
• 4.6 SIMULATION & RESULTS
• 4.6.1 DESCRIPTION
• 4.6.2 SIMULATION PARAMETERS
• 4.6.3 RESULTS
• 4.6.4 DISCUSSION
• 4.6.5 DOPPLER TOLERANCE ENHANCEMENT
• 4.6.6 NLFM BASED ON PHASE PREDISTORTION
• 4.7 SUMMERY
• CHAPTER 5 SIDELOBE SUPPRESSION USING THE NLFM FOR SAR IMAGING
• 5.1 INTRODUCTION
• 5.2 SELECTION OF SAR IMAGING ALGORITHM
• 5.3 SIMULATION PROCESS
• 5.4 SIMULATED SCENARIO
• 5.5. RAW ECHO SIGNAL OF SAR
• 5.6 FIGURES OF MERIT IN SYNTHETIC APERTURE IMAGES
• 5.7 SIMULATION RESULTS
• 5.7.1 GENERATING SAR IMAGE WITH NLFM
• 5.7.2 SIMULATING OF FM JAMMER EFFECT
• 5.7.3 EVALUATING NLFM IMAGING IN THE PRESENCE OF FM NOISE JAMMER
• 5.8 SUMMERY
• CONCLUSION
• FUTURE WORK
• REFERENCE
• PUBLICATIONS
• ACKNOWLEDGEMENT