AMR-C and HRMR Performance after 1 Year
Event: 2022 Ocean Surface Topography Science Team Meeting
Session: Instrument Processing: Propagation, Wind Speed and Sea State Bias
Presentation type: Type Oral
The Sentinel-6 Michael Freilich is the newest reference satellite altimetry mission. It includes a radar altimeter, a precision orbit determination suite and a radiometer to measure wet tropospheric path delay. The AMR-C radiometer on Sentinel-6 includes two new innovations compared to the prior Jason-series missions. The first innovation is the inclusion of a secondary calibration system external to the radiometer that is used to stabilize the wet path delay measurement to 0.7mm/yr over 5+ years. The second is a high-frequency radiometer (termed HRMR) with <5km spatial resolution that improves the measurement near land and sea ice boundaries. We will present the performance of the AMR-C and HRMR radiometer systems over the first 1.5 years of in-flight operation. We show that the secondary calibration system provides an unprecedented level of stability and is a new standard for calibration stability for altimeter missions. We also show that the HRMR is providing path delay with < 1cm uncertainty to within 5km from land, a dramatic improvement from prior altimeter missions.