1. Jan Douša and Galina Dick COST GNSS4SWEC Workshop and MC Meeting
COST WG1 activities
Jan Douša and Galina Dick
COST GNSS4SWEC Workshop and MC Meeting
March 8-10, 2016
Reykjavik, Iceland
COLAGE invited talk: When: April 2 (Friday) at Conference (Atibaia city): Subject:
General information of CHAMP mission,
Application of GPS occultation data to retrieve TEC, Temperature profile and water vapor, and
CHAMP data bank.
Audience: South America's Space geophysics community and Graduate students.

2. WG1 main objectives The main WG1 goals are defined in four domains:
Coordinating of development advanced tropospheric products in support of weather forecasting (ultra-fast products, asymmetry monitoring, tomography, multi-GNSS processing)
Exploiting numerical weather data in precise GNSS positioning (mapping functions, a priori ZHD modeling, tropospheric gradients, tropospheric models for real-time positioning, parameter conversions)
GNSS data re-processing and assessment of involved models (to provide consistent tropospheric products for climatology)
Stimulating transfer of knowledge, tools and data exchange in support of new analysis centres and new networks setup
Sub-WG1: 10 specific activities and leaders appointed.
WG1 members: 73 members / 25 countries / 4 non-EU partners.

3. New ACs/networks New ACs Support by: New data/networks for E-GVAP
Goal: Support transfer of knowledge, data exchange for improving coverage of tropospheric products in Europe
Goal: Support transfer of knowledge, data exchange for improving coverage of tropospheric products in Europe
New ACs
SGO – Satellite Geodetic Observatory, Penc, Hungary (Bernese)
KTU – Karadeniz Technical University in Trabzon, Turkey (TropNET)
AUT – Aristotle University in Thessaloniki, Greece (TropNET)
BEU – Bulent Ecevit University in Zonguldak, Turkey (TropNET)
IMO – Icelandic Meteorological Office (TropNET)
MUT – Military university of Technology, Warsaw, Poland (TropNET)
SUG – Sophia University, Bulgaria (Uni Luxembourg?)
Support by:
GOP - TropNET processing package for Bernese sw
… including NRT monitoring & offline evaluations in GOP-TropDB
Uni Luxembourg – support in Bulgaria (post-processing campaign)
New data/networks for E-GVAP
Italy(+), Hungary, Greece, Lithuania, Latvia, Slovakia, Turkey, Iceland
+ others expected: Turkey(+), Greece(+), Austria, Denmark, …
+ re-vitalised: Norway, Sweden, Finland, Poland
TropNET info: ( Trop-NET )

4. REPRO: GNSS Troposphere Reprocessed Products
EUREF Repro2:
3 ACs process full EUREF Permanent Network (EPN)
ASI /E-GEOS (Gipsy/Oasis)
GOP – Geodetic Observatory Pecny (Bernese V52)
MUT – Military University of Technology (GAMIT)
2 ACs contributes with EPN subnetworks
LPT – Swisstopo (Bernese V52)
IGN – Instituto Geografico National (Bernese V52)
EUREF combined solution (even more variants possible)
ASI/E-GEOS – EUREF Tropospheric Product Coordinator
Others:
IGS Repro2: waiting for IGS final PPP, available troposphere from CODE, GFZ (TIGA)
GRUAN: focus on few stations – instrument collocation – activities in GFZ & ASI
Goal: Prepare state-of-the-art homogeneous tropospheric product(s) for climate – support for WG3
GNSS Reprocessing products
Courtesy of J. Douša

5. Preparation phase: design & data collection
Benchmark Campaign
Goal: Design a common data set for advanced GNSS products and strategy developments, their evaluation and inter-comparisons
Preparation phase: design & data collection
May-June floods of Danube/Moldau/Elbe rivers
GNSS: ~500 stations (AT, CZ, DE, PL)
SYNOP: ~200 stations (AT, CZ, DE, PL)
NWM: regional (Aladin-CZ), global (ERA-Interim, NCEP GFS)
RS OBS: E-GVAP + two high-resolution (CZ)
WVR: Potsdam, Lindenberg (DE)
RADAR images: Brdy, Skalka (CZ)
Reference products
GNSS: Bernese (GOP), EPOS (GFZ)
NWM: G-Nut/Shu (GOP), DNS (GFZ)
User phase
contributions, evaluations
feedbacks, interpretations
Courtesy of M. Kačmařik
Douša J, Dick G, Kačmařík M, Brožková R, Zus F, Brenot H, Stoycheva A, Möller G, Kaplon: Benchmark campaign and case study episode in Central Europe for development and assessment of advanced GNSS tropospheric models and products, Atmosph Meas Tech, Online Discussion, 2016

6. Troposphere products for asymmetry monitoring
Goal: develop and assess advance products for tropospheric asymmetry monitoring
Courtesy of J.Douša
GOP’s GNSS-based gradients
GFZ’s GNSS-based gradients
GOP’s GNSS-based gradients
ECMFW’s ERA-Interim gradients
NCEP’s GFS real-time gradients
Figure: May 31, 2013 (Benchmark) – estimates of tropospheric gradients from GNSS & NWM
Advanced tropo-products: horizontal tropospheric gradients & slant delays
Development of NRT/RT high-resolution gradients
Development of NRT/RT slant delay retrievals including definition for new Tro-SINEX format standards
Derivation of 1st and 2nd order troposphere gradients from NWM
Inter-comparison of gradients and slant delays from GNSS, NWM and WVR

7. NWM-based advanced positioning
NWM-derived tropospheric parameters
to strengthen & accelerate GNSS real-time processing
to improve re-analysis solutions
to assess quality of NWM
to compare GNSS-troposphere with independent data
Goal: Exploitation of NWM data in GNSS data analysis
Courtesy of F. Zus

8. Real-Time products - Demonstration Campaign
Goal: Develop and assess ultra-fast and real-time tropospheric products for NWP nowcasting
Use of IGS Real-Time Service global products for PPP (GNSS satellite orbits & clocks)
Developing and assessing new software and strategies
RT Demo campaign
Scope: Europe (15) + Globe (17)
Start: April 1, 2015
Status: 2 March, 2016
Software: 6+1 types
Contributions: 7+1 ACs
Courtesy of J. Douša
Monitoring at: AC
Software
Start
Update
Solutions
GOP
G-Nut/Tefnut
real-time
GPS, GLO, gradients
TUW
TUW software
GPS
ROB
ASI
Gipsy-Oasis
hourly
GPS, gradients UL
(PPP-wizard)
ICS
G-Nut/Shu
forecast
WRF model (EU, CZ)
TUO
RTKLib
BKG
BNC
GPS, GLO

9. Towards multi-GNSS tropospheric products
Goal: Adapt software of multi-constellation processing and assess its impact on tropospheric products
Several software developed/adapted for multi-GNSS data processing
GLONASS partly integrated in various NRT & RT-Demo solutions, GLONASS used within Benchmark campaign
Since November 2015 GFZ provides ultra-rapid multi-GNSS orbit and clock product (GBU) for every 3 hour
Includes GPS, GLO, GAL, BDS and QZSS satellites
Latency is less than 2 hours since the last observation
Multi-GNSS tropospheric horizontal linear gradients compared to those derived from NWM refractivity field (ECMWF analysis)
Courtesy of X. Li (GFZ)
Courtesy of Z. Deng (GFZ)

10. Achievements
Four new analyses centres operational, several national networks included ( EGVAP)
EUREF 2nd re-processing – contributions completed, combination in progress ( WG3)
Real-Time Demonstration campaign: designed, running, monitored & evaluated ( WG2)
Benchmark
design, data collected, reference product prepared/assessed, documented & published( WG2)
Activities: slant delays & gradients, RT simulation, impact of hydrometeors, NWM tropo corrections
Troposphere asymmetry study ( WG2)
gradients estimated, studied & compared (NWM, GNSS, VLBI)
slant delays retrieved & compared (NWM, GNSS, WVR), TroSINEX format defined & prototyped
Developed tools for supporting use of NWM data in positioning
several augmentation tropo correction models developed & assessed
development and assessments of improved tropo modeling (enhanced MF, 2nd order gradients, …)
Multi-GNSS - GLONASS, BeiDou, Galileo, QZSS: software adapted, products/models, repro