METHOD AND APPARATUS FOR MONITORING SURFACE DEFORMATIONS OF A SCENARIO

摘要

A method for monitoring surface deformations of a scenario by means of differential interferometry technique, said method comprising the steps of prearranging a radar sensor comprising at least one transmitting antenna and a receiving antenna arranged to transmission and acquisition of radar signals, said radar sensor arranged to move along a planar trajectory γ having centre O; defining a reference system S having origin in said centre O; acquiring by SAR technique said scenario by means of handling said radar sensor along said planar trajectory γ, said radar sensor being configured in such a way that the radiation pattern of said antennas is oriented radially with respect to said centre O, said acquisition occurring at points of acquisition si arranged on said trajectory γ, obtaining a plurality of data for each point of acquisition si; defining a plurality of target points ti of said scenario, the three-dimensional position of each target point ti being definable by means of spherical coordinates (ρi,θi,βi) referring to said reference system S, being known the values of said coordinates ρi and θi. The method further comprises a step of three-dimensional determining of said target points ti by the steps of focusing at a first height of acquisition ha1 each target point ti with respect to its own position considering a value of βt predetermined and equal to β0, focusing at a second height of acquisition ha2≠ha1 each target point ti with respect to its own position considering a value of βi predetermined and equal to β0, controlling, by means of interferometric technique, said focusings at the height of acquisition ha1 and ha2 obtaining a value of said coordinate βi for each target point. The method further comprises a step of global focusing each target point ti with respect to its own three-dimensional position definable by said spherical coordinates (ρi,θi,βi), obtaining a first focused radar datum, said step of focusing being obtained, for each target point ti, by analyzing data obtained at each point of acquisition si wherein said target point ti is detectable.