NOAA’s Commercial Data Program Announces Radio Occultation Objectives Based on Analysis of Alternatives
In January 2025, NOAA/NESDIS completed a Phase 1 of the Radio Occultation (RO) Analysis of Alternatives (AoA) to assess constellation concepts for Global Navigation Satellite System (GNSS) RO capabilities, as the set of six COSMIC-2 satellites reach the end of their operational life.
The findings highlight the need for a sufficient number of well-distributed GNSS-RO observations, along with enhancement in data refresh rates and reduced latency.
To effectively address these needs, NOAA plans to procure commercial RO data-as-a-service from diverse and coordinated orbits. Observations within the equatorial regions are especially important for improving latency and data refresh into weather prediction models.
NOAA will seek to increase RO commercial data acquisitions in the equatorial regions as COSMIC-2 degrades in addition to increasing RO commercial data purchases in the polar and mid-latitude regions.
Focusing on diverse orbits with appropriate data latency will ensure continuous global geographic coverage and consistent local observation times, supporting NOAA’s weather modeling and space weather applications.
NOAA plans to align with the Radio Occultation Modeling Experiment (ROMEX) study, which analyzes the impact of radio occultation data on forecasting and recommends a minimum of 20K RO profiles/day.