Abstract's details
Next-generation radiometer instruments, algorithms, and uncertainties due to 24 GHz 5G interference
CoAuthors
Event: 2019 Ocean Surface Topography Science Team Meeting
Session: Instrument Processing: Propagation, Wind Speed and Sea State Bias
Presentation type: Type Oral
Contribution: PDF file
Abstract:
This presentation summarizes the recent advancements in radiometer instruments and algorithms development at the NASA’s Jet Propulsion Laboratory for the next-generation path delay correction in the Sentinel-6/SWOT-era. Particularly, the Sentinel-6 mission will provide continuity to ocean surface topography measurements started by the Topex/Poseidon mission launched in 1992, followed by Jason-1 in 2001 and Jason-2 in 2008. The Advanced Microwave Radiometer (AMR) is one of the primary instruments on-board the current altimetry missions (Jason-2/Jason-3) that determines radar travel time delay, also known as path delay (PD), caused by atmospheric water vapor and liquid water content in the atmosphere using three frequency channels (23.8, 18.7 and 34.0 GHz). The AMR-C (Climate Quality) receiver for the Sentinel-6 is an improvement from the previous AMR, designed and developed to meet the level 3 payload requirement of long-term radiometric stability through Supplemental Calibration System (SCS). In this presentation, we will report preliminary pre-launch radiometric performances from the Sentinel-6 AMR-C instrument.
Besides, a next-generation Combined Active Passive Retrieval System (CAPRS) is developed at JPL that uses all information available in both active/passive radar and radiometer instruments. The next-generation CAPRS system is based on variational inversion technique, where, path delay and other atmospheric parameters, including wind speed and cloud liquid water are derived simultaneously using both the information available from the radiometer brightness temperature and altimeter backscatter measurements. The status and results from the CAPRS system will be presented. Our final part of the presentation will cover the simulation studies performed at JPL to understand the impact of 24 GHz 5G interferences on AMR radiometers. The uncertainties on path delay measurements due to the interferences, and possible mitigations will be discussed.
Besides, a next-generation Combined Active Passive Retrieval System (CAPRS) is developed at JPL that uses all information available in both active/passive radar and radiometer instruments. The next-generation CAPRS system is based on variational inversion technique, where, path delay and other atmospheric parameters, including wind speed and cloud liquid water are derived simultaneously using both the information available from the radiometer brightness temperature and altimeter backscatter measurements. The status and results from the CAPRS system will be presented. Our final part of the presentation will cover the simulation studies performed at JPL to understand the impact of 24 GHz 5G interferences on AMR radiometers. The uncertainties on path delay measurements due to the interferences, and possible mitigations will be discussed.