1 research outputs found
Impact of atmospheric water vapor on the design of a Ku band geosynchronous SAR system
Abstract
We consider a geosynchronous Ku band system, and the
defocusing effects due to the temporal and spatial variability
of the atmospheric water vapor. Due to the very slow
formation of the spatial chirp (minutes or even hours), the
temporal change of the local water vapor content could be
significant, thus preventing a correct image focusing and the
formation of a coherent image.
Using GPS and ground based radar data, we estimate and
model the spatial temporal correlation function of the water
vapor delay. Then, for a given spatial scale, we estimate the
maximum time within which the temporal evolution of the
water vapor should be carried out, to be able to track its
temporal evolution. This requisite constrains both the EIRP
and the apparent velocity of the satellite. Then, we
evaluate the possibilities of real time ground motion
analyses, as a function of the spatial and temporal resolution
and the EIRP