1 Introduction .................................................. 1
1.1 Synthetic aperture radar .................................. 2
1.2 State-of-the-art .......................................... 4
1.3 Thesis contribution ....................................... 5
2 Principles of SAR Processing .................................. 9
2.1 The SAR signal ............................................ 9
2.1.1 Matched filter ..................................... 14
2.1.2 Deramping .......................................... 16
2.2 Processing algorithms .................................... 17
2.2.1 The Range-Doppler algorithm ........................ 18
2.2.2 The Chirp Scaling algorithm ........................ 19
2.3 Errors due to motion deviations .......................... 22
2.3.1 Phase errors ....................................... 23
2.3.2 Motion compensation ................................ 26
2.4 Autofocus algorithms ..................................... 28
2.4.1 Phase gradient autofocus ........................... 28
2.4.2 Weighted least-squares autofocus ................... 30
2.4.3 Autofocus for stripmap mode ........................ 31
2.5 Summary and final remarks ................................ 33
3 Principles of SAR Interferometry ............................. 35
3.1 Interferograms ........................................... 35
3.2 Differential SAR interferometry .......................... 38
3.3 Permanent scatterers ..................................... 41
3.4 Spectral diversity and multisquint ....................... 44
3.5 Summary and final remarks ................................ 47
4 New Processing Methodology for Airborne Repeat-Pass
Interierometry ............................................... 48
4.1 Precise topography- and aperture-dependent motion
compensation ............................................. 49
4.1.1 The PTA approach ................................... 49
4.1.2 The PTA algorithm .................................. 50
4.1.3 Experimental results ............................... 52
4.1.4 Conclusions ........................................ 54
4.2 An autofocus approach for residual motion error
estimation ............................................... 56
4.2.1 The WPCA kernel .................................... 58
4.2.2 Filter to avoid SCR degradation .................... 59
4.2.3 The WPCA framework ................................. 60
4.2.4 Accuracy and convergence ........................... 62
4.2.5 Experimental results ............................... 63
4.2.6 Comparison with multisquint ........................ 71
4.2.7 Conclusions ........................................ 74
4.3 Summary and final remarks ................................ 75
5 Airborne Differential Interierometry ......................... 78
5.1 Urban area case .......................................... 78
5.2 Landslide case ........................................... 85
5.3 Permanent scatterers in airborne data .................... 92
5.3.1 Probability of detection and false-alarm rate ...... 92
5.3.2 Selection performance .............................. 94
5.3.3 Selection performance on real data ................. 96
5.3.4 Differential interferograms ........................ 98
5.3.5 Estimation of parameters .......................... 107
5.4 Summary and final remarks ................................ 112
6 Conclusions and Further Work ................................ 113
Bibliography .................................................. 116
| 
