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We present a three-dimensional ͑3-D͒ hyperspectral image compression algorithm based on zero-block coding and wavelet transforms. An efficient asymmetric 3-D wavelet transform ͑AT͒ based on the lifting technique and packet transform is used to reduce redundancies in both the spectral and spatial dimensions. The implementation via 3-D integer lifting scheme(More)
Multi-band Doppler spectrum of radar clutter at there-dimensional sea surface is calculated in this paper, the Elfouhaily sea spectrum with a direction function is applied to achieving the scattering fields is a classic PO method. Analysis on the spectrum width and shift of multi-band can be done. Larger spectrum width and shift have been seen in larger(More)
Based on the Planck's law and integrality the directional hemisphere reflectivity (DHR) and the Kirchhoffs law. And referred to the Torrance-Sparrow model and the five-parameter semi-empirical model, a new Bidirectional reflection distribution function model (BRDF) is developed in different temperature of material surface, this model will be applicable for(More)
The 3-D target information can be obtained directly by the analysis of the 1-D data of the pulse laser range profile (LRP). In this paper, a new calculational method to generate and process the LRP which is based on the lidar equation is established. The LRPs of different targets are simulated by the new method, and the corresponding profile information is(More)
The fourth-order moment of the scattered light, namely, the correlation function of the scattered intensity fluctuation from two-dimensional optically weak homogeneous and isotropic rough surfaces obeying Gaussian distribution are investigated based on Beckmann theory and Gaussian moment theorem. Analytical and numerical results are given for the(More)
The composite scattering from the conducting targets above and below the dielectric rough surface using the extended Propagation-Inside-Layer Expansion (EPILE) combined with the Forward-Backward method (FBM) is studied. The established integral equations are approved by comparing with the related theory. The accuracy and efficiency of the EPILE + FBM are(More)
The generalized forward-backward method was used to investigate the scattering characteristics from the sea surface with breaking waves, which gives a preliminary analysis of mechanism of sea spike phenomenon. The integral equation using impedance boundary condition was used for one-dimensional (1-D) PM surface. GFBM increasingly improved the computational(More)
Propagation of THz waves from 0.1THz to 0.8THz in sand-dust are studied using Mie theory and Monte Carlo(MC) simulation. Scattering characteristics of a spherical sand-dust particle illuminated by THz waves are analyzed by Mie theory. The extinction efficiency factor, the asymmetry parameter and scattering intensity versus frequency of incident waves are(More)
Based on the Physical optics approximation, the scattering field in the far zone by arbitrarily shaped objects with slightly rough surface which obeys Gaussian distribution and its two-frequency mutual coherence function are derived theoretically, and the numerical results for rough spheres and rough cylinders are given and analyzed. The results show that(More)