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DInSAR technique for three-dimensional coastal spit simulation from Radarsat-1 fine mode data

Marghany M.

Acta Geophysica

2013

Vol. 61, no. 2

478--493

This work presents a new approach to 3D spit simulation using differential synthetic aperture interferometry (DInSAR). In doing so, conventional DInSAR procedures are implemented to three repeat passes of RADARSAT-1 SAR fine mode data (F1). Further, a new application of using fuzzy B-spline algorithm is implemented with phase unwrapping technique. The study shows that the performance of DInSAR method using fuzzy B-spline is better than the DInSAR technique, which is vali- dated by the coefficient of determination r² of 0.96, probability p of 0.002, and accuracy (RMSE) of ± 0.034 m, with 90 per cent confidence intervals. In conclusion, integration of fuzzy B-spline with phase unwrapping produces an accurate 3D coastal geomorphology reconstruction.

Non-diffraction fringes produced by thin biprism

Liping Z., Jianghong G., Long X.

Optica Applicata

2012

Vol. 42, nr 4

699--711

Thin biprism can form non-diffraction fringes when it is illuminated by coherent plane wave and the non-diffraction fringes have long focal length and uniform intensity distribution. Geometrical optics characteristic of thin biprism is analyzed. Non-diffraction field produced by thin biprism at the Fresnel zone is deduced with exact Fresnel integral and an approximation representation is obtained by the stationary phase method. Numerical calculation is utilized to investigate the properties of non-diffraction fringes and evaluate the influence of the diffractive field caused by rectangle aperture's square edge on the fringes. An experiment is setup to observe the intensity of the non-diffraction fringes.