ASAR Practical 1: SAR Processing and Analyses Tools
ASAR Practical 1: SAR Processing and Analyses Tools
ASAR Practical 1: SAR Processing and Analyses Tools
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Azimuth cutoff analysis in <strong>SAR</strong>Tool<br />
• What is <strong>SAR</strong> the <strong>SAR</strong><br />
azimuth cutoff?<br />
• The <strong>SAR</strong> azimuth cutoff is<br />
proportional to the rms of<br />
the line-of-sight<br />
component of the waves’<br />
orbital velocities<br />
• It features the strength of<br />
the Gaussian-like low-pass<br />
azimuthal filtering process<br />
such as expressed in the<br />
quasi-linear spectral<br />
transform of Ocean<br />
spectrum into <strong>SAR</strong><br />
spectrum<br />
⎛Λ⎞ λc= 2π ρξξ<br />
( 0)<br />
+ a a ⎜<br />
2π<br />
⎟<br />
⎝ ⎠<br />
k<br />
k<br />
1<br />
2<br />
( 0)<br />
( )<br />
( )<br />
vb<br />
a a<br />
( )<br />
2<br />
azres where<br />
k2 2 ⎛ R ⎞ k2<br />
2<br />
ρξξ ( 0)<br />
= Tvb ( k) S( k) dk S( k) dk<br />
a a ∫ ω<br />
k ⎜<br />
1 V<br />
⎟ ∫k<br />
⎝ ⎠ 1<br />
ρ<br />
∫<br />
ξξ<br />
T k<br />
S k<br />
Λ<br />
2<br />
October 10, 2007<br />
Ocean2007 Hangzhou<br />
: Variance of azimuthal displacements at image construction<br />
2<br />
ω S k dk:<br />
Variance of orbital velocities<br />
azres<br />
: Velocity bunching modulation transfer function<br />
: Ocean height spectrum<br />
: Spatial resolution in the azimuthal (along-track) direction<br />
49
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