Abstract
Terrain height estimation through spaceborne interferometric synthetic aperture radar (INSAR) requires accurate knowledge of the orbital shift between repeat passes. Mathematical models are available for the estimation of horizontal orbital shift. However, in reality, the orbital shift between repeat passes is modelled as two-dimensional for the same azimuth scanline. In this paper, a new mathematical formulation has been developed for the estimation of the two-dimensional orbital shift of INSAR based on the fringe line pattern in the interferogram of flat earth.
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