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Chapter 7 Conclusions A SAR inversion formula fol surface scatter.ed SAR data in the /-É clomain has Ì¡eel established ir this thesis basecl on the Born (first) approxirnation colcept. The cleveloprnent has been focused on the initial for.rnulatiou and nurnelical irrplementation. The incident fielcl as well as the bacl
ackscatte.i'g coefficiert can be cleterni.ed, if clesi.ecl. sirnuratio' r'esults aÌe plesentecl to demonstrate tliat phase infolmation of the scatteÌer.s can be 1;recisely cleterrrined by the nerv invelsion methocl. The'esults of a'expe'ime't usi'g actual ai.l¡or'e sAR dat¿ set accluirecl by the CCRS, in the naclir mocle, tur'ed out to be slight,ly uncler.focusecl. The poor PeÌfol[ralce is paÌtly clue to acl hoc estirnation of system paraÙreters du'i.g the processilg a'cl partly due to the i.herent pr.oblern of airl¡orne uacli. rnode operati'g geornetry, Despite the i'itial under.focusi'g pr.oble'r, furthel focusilg plocesses, incor.poratecl with the inversiol pr.ocessing, plocluce a well-focusecl final SAR inrage. Although the theoretical derivation oI |he f-k dor:tain invelsion is norv cornpleted, certain details of the numer.ical irnplementation of the approach are yet to be assessed quantitatively. More detailecl theor.etical review and qualtitative experirnents using satellite-bor.ne SAR clata are neecled to ver.- ify that the new approach extracts the complex backscatterilg coeficient ploperly. Valious techniques of SAR iurage enhancernent for geological application have also been investigatecl and testecl. In cletemrination of the dontinant linearnent trends, the plot of the rnaxinum arnplitude of Radon transfor.rn versus slope is founcl to be ver.y useful. The i'aclar look direction ì¡ias can also be analyzed using this plot. Two dirnensional corl'elation using the Radon transform is also revierved, ancl it is found that the Ra
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INVERSION OF SYNTHETIC APERTUR,E R,
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ñr^-- ltoN. J00NG suN '¿i¡r"r os
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I heleby declale that I am tlie sol
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plot of the maximum amplitude of th
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Contents Abstract Acknowledgements
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6.3.1 Introduction ..151 6.3.2 Digi
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5.1 Florv chart fot the proposecl i
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List of Tables 2,1 Seasat SAR senso
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List of Notations cr squint angle P
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tist of Abbreviatíons SAR Syntheti
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The objectives of this thesis rnay
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Ground Range l;l 2 sin0 Figure 1.2:
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ol'cler to evaluate its full aclvan
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algolithrn extlacts the complex bac
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successful as expected. Thele ale,
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eú ø1. [103]). Similal clevelopme
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aerial plìotogl'aphy ovel the area
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2.2 Spaceborne SAR Systems 1) SEASA
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tlie basis of a distinctive dlainag
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set fol selectecl aleas, useful for
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3) ERS-I The first European rernote
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Table 2.4: ERS-I Ðieterle [104]).
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Table 2.6: ERS-1 SAR pelfolmance re
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Table 2.7: JtrRS-1 olbit pararnetel
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Table 2.9: Chalactelistics of OPS o
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Table 2.11: Specifications of Racla
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Chapten 3 Review of Digital SAR Pro
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,I Figule 3.1: Raclar' L¡earn geom
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I L-=J}"no Figure 3.2: Geouretry fo
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vhich is the clistance across the a
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vlrere ø6 is a angular center fi'e
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à1 äl (a) /1T. or^l - r+ (b) I à
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a,pploxirnated by l2p sinl(I - ltl)
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-s(cu) is rewlitten as s@¡ - !"-,r
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cliscussecl later il this sectio¡r
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Ïon = _2 (V(ro) .V(¿o)+ R(ro) .A(
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: Range Walk : Range Curvatule : Ra
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olbital SAR is given by Ion = -'#{t
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is constant cluling the receiving p
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a at f¡r
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'rvith a foulula developed il this
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Chapter 4 Theoretical Development 4
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developed and cliscussed by several
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vhere u (r,ro; u) : I U 1r,ro,t)e-i
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wheÌe k':frf a¡cl lc -_ uf us ant
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4) there is relative motion of ante
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o =løo, 0, 0) Figure 4.1: Schemati
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elorv that sulface. In genetal, sul
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4.4 The Inversion The equation Eq.(
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*'here % is a platfolrn velocity an
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The trq.(a.36) cannot be used dilec
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vhele Àl is a tvavenurnbel collesp
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2-D FFT o(,b,;ø) Intelpolation in
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¡nE 0$r-sEc, ¡3 I IrlÊ [18- 5EC
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5.2 Digital Simulation Digital sirn
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Table 5.2: Moclel palametels fol di
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signal and the leconstructe
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(3 È. e tc o) o -tl a Slant Range
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that the inversiol method can accor
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(n t0 Ê) 0c (lr) Figure 5.6: Seasa
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5.3 Processing of Real SAR Data A s
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squâre pixel rvith clir¡ension of
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Aziurutì (n Þ !d !D gc Figule 5.1
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(n 5 F Þ tq Figu.e 5.11: Reconst.u
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over tlìe 2.4 inches as shol¡l i'
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Ø Þ :J m (a) (b) ^a ctl _= a"r ro
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Chapter 6 SAR fmage Enhancement for
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1) hoiv can the tlends of lineament
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6.2 Determination of Geological Str
Page 139 and 140: Coolclinates for the image space an
Page 141 and 142: Figure 6.2: Point, lines, and hyper
Page 143 and 144: scatteter (e.g. coller leflectols,
Page 145 and 146: Figure 6.5: CCRS's airboure C-band
Page 147 and 148: C-l¡ancl SAR irnagery ovel this al
Page 149 and 150: Figure 6.8: Radon transform of ailb
Page 151 and 152: in the irnage space ancl the Iine i
Page 153 and 154: ERS- 1 N U 0 rl 0o |lO + ,¡l r.l p
Page 156 and 157: 6.2,3 Correlation Using The Radon T
Page 158 and 159: Since the inside of the squale blac
Page 160 and 161: Figule 6.12: Model test for correla
Page 162 and 163: thlough the Radon tlansfolm is shor
Page 164 and 165: Figure 6.15: Airborne C-band SAR da
Page 166 and 167: distinct points can be cliscelnerl
Page 168 and 169: Figure 6.18: Correlation output thr
Page 170 and 171: 6.3 Merging of Multiple SAR Image D
Page 172 and 173: in Figure 6.19 tvhich is a clilect
Page 174 and 175: Figure 6.20: Additive irnages rvith
Page 176 and 177: Figule 6.22: Subtractive images rvi
Page 178 and 179: (1) select a clirection to be enhan
Page 180 and 181: Figure 6.24: Lnage obtained through
Page 182: 6.3.4 Principal Components Analysis
Page 185 and 186: Table 6.2: Con'elation coeffrcielt
Page 187 and 188: Figure 6.27: The PCA frrst componen
Page 189: the geological surface lilearrent f
Page 193 and 194: Appendices A. Derivation of Forward
Page 195 and 196: B. Derivation of Inversion Formula
Page 197 and 198: C. Derivation using the Method of S
Page 199 and 200: F[eferences [1] Ahmed, S., \Vallen,
Page 201 and 202: [20] Curlis, J.D,, Flost, V.S., Del
Page 203 and 204: [43] Holn, R., 1988, E-SAR - The ex
Page 205 and 206: [65] Lotrelrl, O., 1990, Dopplel ce
Page 207 and 208: [87] Pye, 8.G., Nalch'ett,4.J., anc
Page 209: [111] \,Vu, C., Balkan,8., I(arplus
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