Identifying Persistent Scatterers in Open and Natural Areas Conference Paper uri icon

abstract

  • 1. ABSTRACT The PSI (Persistent scatterers Interferometry) method re-lies on identifying a small group of scatterers that main-tain high phase reliability over a relatively long period of time. This study demonstrates a new algorithm to iden-tify natural PSC (persistent scatterer candidates) targets in non-inhabited areas. The application of our PSC se-lection process is conducted for a natural arid scene as opposed to the more common use of the PS technique, which is done mostly for urban areas with strong reflec-tion structures (manmade objects). We present a novel, robust, method to identify PSC in open fields and in places of low backscattering (natural areas). Our method is based on the amplitude times history signature of each point. The main difference between urban areas and open field areas is the low reflectance and less deterministic behaviour of the scatter; hence it is a challenge to de-tect these low reflection and stable points. Conventional methods for PSC detection require a preprocessing of fine calibration and are mainly suitable to use in urban areas, but may fail when used in the open fields. One of the advantages of our method is the use of a simple process of calibration which is based only on the flight geometry and gain factors without any auxiliary data or assump-tions. Consider a vector consisting of the measurement of a PS point as a function of time. We can express this sig-nal as an amplitude times a phase. The amplitude differs between PS points; however potential PS points should correlate spatially and temporally in terms of the phase, independent of their amplitude. Our method improves the ability to locates several candidate points with a narrow phase distribution and thus, enables the location of PSCs in open areas.

publication date

  • March 1, 2011