Study of Synthetic Aperture Radar Data Compression and Encoding. Part 1: SAR Image Data Analysis

摘要

A model to describe the returned voltages of a coherently illuminated radar target was extended to nonhomogeneous targets. The total SAR transfer function in range and azimuth, and two methods for generating artificial SAR images were derived: coherent averaging with (real) spatial and frequency filter respectively. The latter method was implemented as program SPECKL with parameters including number of looks, the signal to (thermal) noise ratio and the weighting in azimuth and range. Quality measures for judging processed radar imagery were reviewed, particularly fidelity and resolution measures. Algorithms for information extraction were assessed. A multifeature classification of a land scene and a Fourier analysis of a sea wave scene are recommended.