Sensitivity Analysis of Bistatic Scattering for Soil Moisture Retrieval

Soil moisture is one of the vital environmental variables in land–atmosphere cycle. A study sensitivity analysis bistatic scattering coefficients from bare soil at Ku-band presented, with aim deepening our understanding features and exploring its potential retrieval. First, a well-established advanced integral method was adopted for simulating response soil. Secondly, index normalized weight quality were proposed to evaluate effect on coefficient terms polarization angular diversity, combinations thereof. The results single-polarized VV data show that regions maximum high index, simultaneously, are forward off-specular direction. However, due surface roughness autocorrelation function (ACF), have some limitations inversion. By contrast, two different combinations, as well dual-angular simulation transmitter receivers, significant estimation benefits. It can be seen they all provide better ACF suppression capabilities, larger high-sensitivity area, higher indices compared estimation. In addition, dual or combined measurement provides possibility retrieving backward regions. These expected contribute design future observation systems.