POLInSAR regularisation using dual frequency interferometry

In this paper, we employ a two-level coherent polarimetric vegetation scattering model to investigate forest parameter estimation using fully polarimetric single baseline radar interferometry. It is shown that model inversion requires regularisation to remove multiple solutions. Traditionally this is achieved by using assumptions about polarimetric ground scattering. Here we investigate the possibility of regularisation using an extra InSAR channel obtained from a higher frequency sensor. Given that dual band InSAR systems are already used for airborne mapping applications, and that the SRTM global data base is now widely available, such a regularisation strategy has important practical implications for the efficient use of radar interferometry for quantitative parameter estimation.