tailieunhanh - Báo cáo hóa học: " Model Order Selection in Multi-baseline Interferometric Radar Systems"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Model Order Selection in Multi-baseline Interferometric Radar Systems | EURASIP Journal on Applied Signal Processing 2005 20 3206-3219 2005 F. Lombardini and F. Gini Model Order Selection in Multi-baseline Interferometric Radar Systems Fabrizio Lombardini Dipartimento di Ingegneria dell Informazione Universita di Pisa via Diotisalvi 2 56126 Pisa Italy Email Fulvio Gini Dipartimento di Ingegneria dell Informazione Universita di Pisa via Diotisalvi 2 56126 Pisa Italy Email Received 18 August 2004 Revised 23 May 2005 Synthetic aperture radar interferometry InSAR is a powerful technique to derive three-dimensional terrain images. Interest is growing in exploiting the advanced multi-baseline mode of InSAR to solve layover effects from complex orography which generate reception of unexpected multicomponent signals that degrade imagery of both terrain radar reflectivity and height. This work addresses a few problems related to the implementation into interferometric processing of nonlinear algorithms for estimating the number of signal components including a system trade-off analysis. Performance of various eigenvalues-based information-theoretic criteria ITC algorithms is numerically investigated under some realistic conditions. In particular speckle effects from surface and volume scattering are taken into account as multiplicative noise in the signal model. Robustness to leakage of signal power into the noise eigenvalues and operation with a small number of looks are investigated. The issue of baseline optimization for detection is also addressed. The use of diagonally loaded ITC methods is then proposed as a tool for robust operation in the presence of speckle decorrelation. Finally case studies of a nonuniform array are studied and recommendations for a proper combination of ITC methods and system configuration are given. Keywords and phrases multichannel and nonlinear array signal processing multicomponent signals radar interferometry synthetic aperture radar. 1. INTRODUCTION Synthetic .