1 EUMETSAT SAF NETWORK Lothar Schüller, EUMETSAT SAF Network Manager.
EUMETSAT and Radio Occultations
description
Transcript of EUMETSAT and Radio Occultations
EUMETSAT
and Radio Occultations
Christian Marquardt, Axel von Engeln, Christophe Accadia
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Background: Radio Occultation Missions
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SAC/C
COSMIC
GRACE
OCEANSAT-2
Metop-A Metop-B Metop-C
SAC/D
TerraSAR-X
TanDEM-X
COSMIC-II
CHAMP
NOW
Research
Best Effort
KOMPSAT-5
Operational
Megha-TropiquesPlanned
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GRAS as operational RO mission for 15+ years
- State-of-the-art RO instrument
- 650 occultations / day / instrument (sustained)
With launch of Metop B (early 2012)
– 2 GRAS instruments in orbit
– as long as GRAS/Metop-A can be operated (or until Metop-C launch)
GRAS Ground Support Network (service provided by ESA/ESOC)
- high rate fiducial ground network (40 stations, mostly available on IGS as well)
- GPS orbits and clocks in NRT (latency 2 hrs)
- operational availability (≥ 95%), latency (≤ 15 mins obs) and 24/7 support
- navigation bit network under consideration
GSN raw data provided to UCAR and NSPO, used for operational COSMIC processing
EUMETSAT and Radio Occultations - Present
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EUMETSAT and Radio Occultations - Future
Post-EPS: The follow-on system for the Metop sequence of satellites (EPS)
User-driven requirements process
- takes into account NWP, nowcasting, climate, atmospheric chemistry,
oceanography, hydrology and EPS continuation
- defines priority rank of possible missions (process still ongoing)
Phase 0 (mission analysis) completed in 2009
Phase A (feasibility studies) 2009 - 2011
Phase B (preliminary definition) 2011 – 2013
Phase C/D (detailed definition & production) 2014+
Need date 2020
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EUMETSAT and Radio Occultations - Future
Current mission prioritisation (2008, but still valid after 2009 discussions):
Remaining 16 candidate missions are of ‘Medium’ or ‘Low’ rank
Take into account that VII and SCA are also aiming at nowcasting, oceanography and hydrology applications (which RO doesn’t serve that well).
(see http://www.eumetsat.int/groups/pps/documents/document/pdf_peps_pard.pdf for details)
Candidate mission Rank
High-Res Infrared Sounding
IRS Very High
Microwave Sounding MWS Very High
VIS/IR Imaging VII Very High
Scatterometry SCA Very High
Radio Occultation Sounding
RO High
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EUMETSAT and Radio Occultations - Future
Post-EPS mission requirements for Radio Occultation
- GRAS performance as baseline / improvements considered
- GPS, Galileo, possibly GLONASS (TBC) and BEIDOU / COMPASS (TBC)
- Exploiting new civil frequencies
- Raw sampling / open loop
- Space weather monitoring (on opportunistic basis)
- Early stage of definition - Instrument and mission concepts will be further analysed during phase A of the Post-EPS process.