Local Geography Analysis Using Radar

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The Geo-Location application requires simulation of several radar reflections that are phase coherent with one another. The multiple receivers in the system use the phase relationships between the returns to enable precision mapping and location information. This resolution is generally measured in millimetres. Characterization of the way in which the surface of the earth deforms in response to internal and external forces relies on a variety of geodetic measurement techniques. Most of these methods provide point-to-point measurements of the displacement field. In contrast, DPR provides three-dimensional map views of the deformation. DPR relies on repeated imaging of a given geographic location by air or space-borne radar platforms. With two or more complex (magnitude and phase) radar images of the same area one can construct an interferogram as the difference in phase of the return from each pixel. The phase differences are sensitive to topography and any intrinsic change in position of a given ground reflector. These two effects can be separated using either an independent topographic data set or an additional interferogram that does not include any surface deformation, i.e., with negligible temporal separation between acquisitions. The final product is a map view of the component of surface motion in the direction of the sensor, i.e., the line-of-sight (LOS) displacement. Interferograms typically have 20 to 80 meter pixel sizes and can detect displacements of a few millimetres.

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