https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf draft 2025-07-25 https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/547dd45b-91a6-4511-bdef-157be65d9b6a EXCESS PHASE Date=2025-08-28 User Id=system System Note=Added broader relation from EXCESS PHASE [547dd45b-91a6-4511-bdef-157be65d9b6a] to RADIO OCCULTATION PROFILES [32d72476-ba7b-43fa-b054-84804278aa84] Excess phase quantifies the optical path of a temporally coherent signal as it transects the Earth’s limb less the optical path that would have been obtained by a straight-line vacuum path. Excess phase is induced by refraction of a GNSS signal by the Earth’s atmosphere and ionosphere in GNSS radio occultation. It has the dimension of distance, specifically the temporal refractive delay of a signal multiplied by the speed of light in a vacuum. Its associated independent coordinate is the time of signal reception by a low-Earth orbiting GNSS receiver. 2025-08-28T19:43:32.417Z