Synthetic aperture radar interferometry(9)
时间:2025-07-11
时间:2025-07-11
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
noise)after the interpolation.If,on the other hand,the unwrapped and the absolute phases differ by an integer number
of
(55)
where we can resample and
phase shift
channel
(56)
Thus
if,
then
two times the range
shift divided by the speed of light)which is:1)constant over
the image processed and2)proportional
to
and should
be identical as well.However,when the transfer functions
of the two channels are different and perhaps varying across
the swath,it is be very difficult to estimate the absolute phase
accurately.A particularly troubling error source is multipath
contamination,as it will cause phase and impulse response
errors which are varying over the swath[51].
Small transfer function differences will have a significant
impact on the absolute phase estimated using the split-spec-
trum method as well,due to the very large multiplier
involved
,defined
as
(57)
where antenna,and an-
gular brackets denote averaging over the ensemble of speckle
realizations.For completely coherent scatterers such as point
scatterers,we have
that,
while when the scat-
tered fields at the antennas are independent.The magnitude
of the correlation