Forest parameters inversion with the support of compensation information of radar polarization orientation angle

Polarization characteristics of scatterers are affected by the difference polarization orientation angle (POA), which influences the scattering matrix. Coherences with difference polarization states, which are important statistic data for polarimetric SAR interferometry (PolInSAR) technology, are estimated by scattering matrix and applied to inversion of vegetation parameters using the coherence scatter model. Based on the generation mechanism of polarization orientation angle, the estimation model of complex coherence is constructed in view of compensation of polarization orientation angle. And then, complex coherences with difference estimation methods and difference scatter mechanisms are analyzed under the influence of compensation of polarization orientation angle. The relation between the compensation of polarization orientation angle and the forest parameters inversion is revealed by fitted coherence line with the model of there stage inversion. Using quad-pol SIRC L-band SAR data, it is feasible for improvement the accuracy of complex coherence estimation and forest parameters inversion under the compensation of polarization orientation. The experiment results show that the distribution of difference polarization states can be changed with polarization orientation angle. With the compensation of polarization orientation angle, the accuracy of fitted coherence line is improved, and so the reliability and rationality of forest parameters inverted by three stage model can be improved.