Synthetic aperture radar interferometry(10)

Synthetic aperture radar interferometry is an imaging technique for measuring the topography of a surface, its changes over time, and other changes in the detailed characteristics of the surface. By exploiting the phase of the coherent radar signal, interf

null-to-null angular width of the correlation

function,

)and azimuth

(

(61)

.These quantities are defined in the

figure.

Equation(60)shows explicitly the Fourier transform re-

lation between the SAR point target response function(the

equivalent of the illumination in the van Cittert–Zernicke

theorem)and the geometric correlation.It follows from this

equation that by applying different weightings to the SAR

transmit chirp spectrum,thus

modifying,one can

change the shape of the correlation function to reduce phase

noise.Fig.21shows the form

of

from(58)].

As Gatelli et al.noted,

if,one

obtains

(60) 350PROCEEDINGS OF THE IEEE,VOL.88,NO.3,MARCH2000