PolInSAR forest simulation and characteristic parameters analysis under complex terrain conditions
PolInSAR technology has great application potential and research value in forest parameter estimation and inversion.The aim of this paper is to explore the changing rules of the scattering mechanism of PolInSAR under different terrain conditions and to lay the foundation for the following research on forest parameter estimation and inversion using PolInSAR technology under complex terrain conditions.This paper improves two steps of the terrain model construction and forest location map generation during the simulation process to be suitable for the simulation of PolInSAR forest scenes under complex terrain conditions,i.e.,flat terrain,facing slope and back slope constituting complete three-dimensional terrain scenes,referring to the PolSARprosim simulator customized and developed by the PolSARPro software released by the European Space Agency.Authors generate the simulated PolInSAR image pairs of the backscatter,interference phase,volume coherence coefficient maps under different geometric observation conditions(radar incident angle and terrain slope),all of which conform to the geometric characteristics of SAR in real three-dimensional scenes.Through the analysis of simulation results,it was found that the volume coherence coefficient of PolInSAR images decreases with increasing slope,the interference phase and vertical wavenumber increase with increasing slope,and their sensitivity decreases with increasing incident angle.This article focuses on the inversion of forest height and finds that when considering the influence of terrain slope on vertical wave number,the overall inversion error of forest height is relatively stable except for larger vertical wave number conditions.
万方数据
维普
