Research of RPC model for DEM generation by InSAR technique

Abstract

Abstract:

Synthetic aperture radar Interferometry (InSAR) is a new technique by phase data of SAR complex images for extracting the terrain elevation information, which can solve geographic coordinates of ground points by phase difference of two SAR images. RPC model is a mathematical sense of the imaging geometry model, which is independent of the sensor and platform. This model can establish the relationship between the ground coordinates of the image and the corresponding geographic coordinates. At present, some work has been studied about RPC model as a replacement for Range-doppler model and Phase equation, based on that, this paper states how RPC model is applied for DEM generation by InSAR technique, and then RPC model can be used in four steps, coarse registration, subtract flatten phase, phase height conversion and geocoding. Based on the contrast experiment between COSMO-SkyMed SAR images and ZY-3 optical images for lanzhou area, this paper shows that: mean square error of DEM generated by the RPC model applied for InSAR technology is 7.55 meters

Key words: Rational Polynomial Coefficient(RPC), InSAR, Digital Elevation Model(DEM).

CLC Number:

References

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