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Time-Frequency Transforms for Radar Imaging and Signal Analysis

Kayıt: 18 Şub 2009
Mesajlar: 10

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clcokworks
Tarih: 25 02 2009 00:49

Time-Frequency Transforms for Radar Imaging and Signal Analysis

Time-Frequency Transforms for Radar Imaging and Signal Analysis

http://rapidshare.com/files/202135925/T...8.rar.html

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Contents

1 Introduction 1
1.1 Electromagnetic Back-Scattering from Targets 6
1.2 Radar Signal and Noise 9
1.2.1 Signal Waveforms 9
1.2.2 The SNR 11
1.3 Radar Ambiguity Function and Matched
Filter 13
1.3.1 Radar Ambiguity Function 13
1.3.2 Matched Filter 17
1.3.3 Pulse Compression 19
1.4 Synthetic Aperture Radar Imaging 20
1.4.1 Range Profile 21
1.4.2 Range Resolution 21
1.4.3 Cross-Range Resolution 22
References 22
2 Time-Frequency Transforms 25
2.1 Linear Time-Frequency Transforms 26
2.1.1 The STFT 28
2.1.2 The CWT 32
2.1.3 Adaptive Time-Frequency Representation 33
2.2 Bilinear Time-Frequency Transforms 36
2.2.1 The WVD 37
2.2.2 Cohen’s Class 39
2.2.3 The TFDS 42
References 45
3 Detection and Extraction of Signal in Noise 47
3.1 Introduction 48
3.2 Time-Varying Frequency Filtering 48
3.3 SNR Improvement in the Time-Frequency
Domain 51
3.3.1 SNR Definition Suitable for Signal Detection
and Extraction 54
3.3.2 SNR in the Joint Time-Frequency Domain 56
3.4 CFAR Detection in the Joint Time-Frequency
Domain 57
3.5 Signal Extraction in the Joint Time-Frequency
Domain 61
3.5.1 Time-Frequency Expansion and
Reconstruction 61
3.5.2 Time-Frequency Masking and Signal
Extraction 62
References 63
4 Time-Frequency Analysis of Radar Range
Profiles 65
4.1 Electromagnetic Phenomenology Embedded in
Back-Scattered Data 66
4.2 Time-Frequency Representation of Range
Profiles 70
4.3 Application of High-Resolution Time-
Frequency Techniques to Scattering Data 77
4.3.1 Use of the CWT 77
4.3.2 Use of the TFDS 79
4.3.3 Windowed Superresolution Algorithm 81
4.3.4 Adaptive Gaussian Representation 83
4.4 Extraction of Dispersive Scattering Features
from Radar Imagery Using Time-Frequency
Processing 85
References 89
5 Time-Frequency-Based Radar Image
Formation 93
5.1 Radar Imaging of Moving Targets 94
5.2 Standard Motion Compensation and Fourier-
Based Image Formation 102
5.3 Time-Frequency-Based Image Formation 104
5.4 Radar Imaging of Maneuvering Targets 107
5.4.1 Dynamics of Maneuvering Targets 107
5.4.2 Radar Imaging of Maneuvering Target Using
Time-Frequency-Based Image Formation 108
5.5 Radar Imaging of Multiple Targets 113
5.5.1 Multiple-Target Resolution Analysis 113
5.5.2 Time-Frequency-Based Phase Compensation
for Multiple Targets 117
5.5.3 Time-Frequency-Based Image Formation for
Radar Imaging of Multiple Targets 119
5.6 Summary 120
References 120
6 Motion Compensation in ISAR Imaging
Using Time-Frequency Techniques 123
6.1 Motion Compensation Algorithms 124
6.2 Time-Frequency-Based Motion Compensation 126
6.2.1 Estimating Phase Using Adaptive Time-
Frequency Projection 128
6.2.2 Motion Error Elimination 129
6.3 Motion Compensation Examples of Simulated
and Measured Data 131
6.4 Presence of 3D Target Motion 135
References 144
7 SAR Imaging of Moving Targets 147
7.1 Radar Returns of Moving Targets 148
7.1.1 Range Curvature 149
7.1.2 Clutter Bandwidth 150
7.1.3 Analysis of Radar Returns from Moving
Targets 152
7.2 The Effect of Target Motion on SAR Imaging 155
7.3 Detection and Imaging of Moving Targets 157
7.3.1 Single-Aperture Antenna SAR 157
7.3.2 Multiple-Antenna SAR 161
7.4 SAR Imaging of Moving Targets Using Time-
Frequency Transforms 165
7.4.1 Estimation of Doppler Parameters Using
Time-Frequency Transforms 166
7.4.2 Time-Frequency-Based SAR Image Formation
for Detection of Moving Targets 168
References 170
8 Time-Frequency Analysis of Micro-Doppler
Phenomenon 173
8.1 Vibration-Induced Micro-Doppler 174
8.1.1 Time-Frequency Signature of a Vibrating
Scatterer 177
8.1.2 An Example of Micro-Doppler Signatures of
Moving Targets 179
8.2 Rotation-Induced Micro-Doppler 181
8.2.1 Rotor Blade Motion 181
8.2.2 Radar Returns from Rotor Blades 181
8.2.3 Time-Domain Signatures of Rotation-Induced
Modulations 184
8.2.4 Frequency-Domain Signatures 188
8.2.5 Time-Frequency Signatures 190
References 192
9 Trends in Time-Frequency Transforms for
Radar Applications 193
9.1 Applications of Adaptive Time-Frequency
Transforms 193
9.2 Back-Scattering Feature Extraction 194
9.3 Image Formation 195
9.4 Motion Compensation 195
9.5 Moving Target Detection 196
9.6 Micro-Doppler Analysis 198
References 199
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Kayıt: 18 Nis 2008
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Time-Frequency Transforms for Radar Imaging


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Time-Frequency Transforms for Radar Imaging and Signal Analysis


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