A Study of the Relationship Between Surface Roughness and GNSS-R Coherent Returns Over Land - Wang, Tianlin; Bringer, Alexandra; Johnson, Joel T.; Al-Khaldi, Mohammad (IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium, Geoscience and Remote Sensing Symposium, IGARSS 2022 - 2022 IEEE International, 2022)