ESA UNCLASSIFIED – For Official Use
EGNOS Ionosphere Related ActivitiesS. Schlüter, R. Prieto-Cerdeira
SBAS IWG New Delhi 05-07/02/2014
ESA Presentation | 23/01/2013 | Slide 2
ESA UNCLASSIFIED – For Official Use
Topics
1. EGNOS V2.x.x Ionosphere Related Activities
2. EGEP Ionosphere Related Activities:1. EGNOS V32. EGEP Activities for the Characterization of the Ionosphere3. Activities with African Countries and External Partners
3. Status/Way forward
ESA Presentation | 23/01/2013 | Slide 3
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EGNOS V2 Release Road Map
V2.2ext
•Qualified :June 2008•Certifiable release
V2.3.1p
•Qualified: December 2011•Features: New RIMS (Alexandria, Athens, La Palma), NLES adaption to Inmarsat-4, Block IIF inclusion, Service coverage extension, migration to MPLS network technology, MT9/MT17 Coherency …
V2.3.1i•Qualified: July 2012•Features: Improved robustness to severe Iono activity ...
2.3.2
•Qualified: August 2013•Features: New RIMS (Agadir, Abu Simbel), Optimisation of iono algorithms, Robustness against PRN 25 clock drift feared event (Bergen), Leap second anomaly correction (deployed in 2012) …
V2.4.1M
•Qualified: ~July 2014•Features: Obsolescence resolution (CCF, NLES and EWAN), Qualification of ASTRA Sirius 5, New Missions (LPV-200, MOPS-D), Tuning of Iono processing …
V.2.4.1P•Qualified: ~ Mid 2015 (Procurement On-going)•Features: Introduction of new ASTRA, 1 Step of Iono working activities, …
V2.4.2
•KO march 2014•Features: CPF obsolescence, RIMS A,B,C obsolescence, RIMS L2C capability, GEO ranging, 2 Step of Iono working activities
ESA Presentation | 23/01/2013 | Slide 4
ESA UNCLASSIFIED – For Official Use
EGNOS V2 IONO Objectives
Objectives of V2 Ionospheric Work Packages:
General focus of all activities is to improve availability in front of severe solar max ionospheric conditions
Minor changes/tuning related to some workarounds implemented in the past
V2.4.2 considers also major algorithmic changes in the CPF
ESA Presentation | 23/01/2013 | Slide 5
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EGEP/EGNOS V3 Ionosphere Related Activities
Main Objectives of EGEP/EGNOS V3 IONO Activities:
1. Improving of Means/Tools to support development EGNOS V3 (and V2 releases)
2. Improving/Consolidation of Means/Tools for the future qualification of EGNOS V3
3. Improving of Means/Tools to support other SBAS activities, e.g. Africa
Means/Tools are:
• Characterization of the ionosphere (Indicators of Ionosphere Activity, Specifications, …)
• Reference Models for performance assessment and qualification
• Data (particular focus on: Africa, scintillations)
ESA Presentation | 23/01/2013 | Slide 6
ESA UNCLASSIFIED – For Official Use
24 April 2023 The European GNSS Programmes 6
Definition of an Indicator of Ionospheric Activity
Comments:
• The RMS of all the AATRs (all the satellites) during 1 hour is computed for a given receiver, in order to mitigate spurious values of AATR.
• With the squared mapping, we mitigate the effect worst VTEC computed at low elevation.
Along-Arc TEC Rate (AATR) indicator as the hourly Root Mean Square (RMS) of “weighted” Along-Arc Vertical TEC Rate.
Where Dt can be 30 or 60 seconds
2( )STECAATR
M tD
D
onsa
Stations used for AATR RMS computation
ESA Presentation | 23/01/2013 | Slide 7
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Generation of Ionospheric Reference Scenarios
Requirement
AART RMS Selection of periods and data Reference
Scenarios
3D Iono Model
CDF of AATR RMS (Different for 3 Geomagnetic Regions)
RDG
ESA Presentation | 23/01/2013 | Slide 8
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Developed Scenarios
ESA Presentation | 23/01/2013 | Slide 9
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Scintillation Performance Analysis
Separate
Receiver effects
from
System effects
ESA Presentation | 23/01/2013 | Slide 10
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Scintillation Specifications (preliminary)
ESA Presentation | 23/01/2013 | Slide 11
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EGEP ID 66: MONITOR II
MONITOR IIIONO Repository &
ProductsProcessing
ContributingReceivers &
Product DataASECNA Project
Laboratories
CNES
DLR
ICASES I & II
Others…
EGNOS V2 & V3 Projects
Testbeds
GALILEO Project
CNES
Others..
UsersLaunch of activity: March 2014Core for future EGNOS Iono related activities
ESA Presentation | 23/01/2013 | Slide 12
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MONITOR II Products
Examples:
• Bitgrabber data to replay selected scintillation events
• GNSS observations (Ranges and Scintillation)
• TEC maps
• Scintillation Occurrence maps
• AATR RMS
• Ad hoc generation of ionospheric reference scenarios
• Upgrades of Iono Modelling (GISM, NeQuick)
ESA Presentation | 23/01/2013 | Slide 13
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MONITOR: Ionospheric Experimental Station Network
Central Archiving and Processing Facility
ESA Presentation | 23/01/2013 | Slide 14
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Activities with African Countries and External Partners
Air Traffic Control Agency ASECNA (Agency for Aerial Navigation Safety in Africa and Madagascar)
ESA/CNES Activities with ASECNA
Collaboration with SANSA Collaboration with additional partners
TBD at next IONO SBAS meeting
SAGAIE network
ESA Presentation | 23/01/2013 | Slide 15
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SAGAIE: Two Stations Architectures
NovAtel RxFlexPak6
splitter
INTERNET
Centre de contrôle(e-survey)
e-survey
Architecture 1: Dakar, Lomé
NovAtel FlexPak6 Rx
Septentrio PolarXs Rx
Bitgrabber RF GEMS
splitter
INTERNET
Centre de contrôle(e-survey)
GEAe-survey
Architecture 2: Douala, Ouagadougou, Ndjamena
Bitgraber : 2XUSRPN200 for RF signal recording
PolarXS Septentrio Receiver, GPS, GLO, GAL data collectionand scintillations parameters
Archive all raw data measurements,Rinex it, and send it to Toulouse
FLEXPAK6 Novatel Rx, GPS GLO GAL data Collection
ESA Presentation | 23/01/2013 | Slide 16
ESA UNCLASSIFIED – For Official Use
Data Flow between ASECNA/SAGAIE Network and MONITOR CPF
Monitor CPFCNES SAGAIE
Stations
ESA MONITORStations
ASECNA
High Quality Multi-GNSSReceiver Network
Stations raw Data
FTPServer
Data archiving
CNES
External data flow
Rinex 3+ ISMR
data
High level iono Products
ESA/MONITOR
ESA Presentation | 23/01/2013 | Slide 17
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DAIS
Data Assimilation Techniques for Ionospheric Reference Scenarios (DAIS)
Aiming to generate improved EGNOS Ionospheric Reference Scenarios by combining spaceborne and ground-based GNSS observations.
• Development of a method for combined reconstruction of the ionosphere (Ground & Space GNSS & Model)
• Filling of data gaps, in particular in African low latitudes and over oceans.
• Improved modelling of theCrest (profile, HmF2 and FoF2)
ESA Presentation | 23/01/2013 | Slide 18
ESA UNCLASSIFIED – For Official Use
Status
On-going & Future Activities:
On-going activities to further improve and optimize GIVD/GIVE related algorithms in EGNOS V2 releases
Preparation of EGNOS V3 Phase C/D (Refinement and consolidation of tools and specifications)
Further development of Models and Tools with a strong focus on scintillation effects
MoU for Collaboration of ASECNA, ESA and CNES to be signed in February
SANSA agreed to host 2 stations in Namibia (Implementation: Mid 2014)
Increase of cooperation with external partners for data exchange and coordinated actions in support of EGNOS-V3 and SBAS-Iono group.
ESA Presentation | 23/01/2013 | Slide 19
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Many Thanks for Your Attention!
ESA Presentation | 23/01/2013 | Slide 20
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SAGAIE MAIN FEATURES
1. SAGAIE = STATIONS ASECNA GNSS for ANALYSE of the IONOSPHERE EQUATORIALE
CNES and ASECNA have decided in 2012 to deploy a GNSS data collection network in Sub-Saharian area for ionosphere characterization
– Cooperation agreement signed between ASECNA and CNES in 2012
– CNES in charge of: Overall management, engineering, equipment's procurement and sites deployment
– ASECNA in charge of: sites hosting, Telecom network, and stations operations
– CNES has contracted Thales for stations AIV and for sites deployment
Five sites were selected: Dakar, Lomé, Douala, Ouagadougou and N’Djamena– Dakar and Ouagadougou are actually operational (deployed in May/June 2013)– Douala Lome and Ndjamena will be deployed in July 2013
ESA Presentation | 23/01/2013 | Slide 21
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Step 1 service area – for analysis during Phase B
ESA Presentation | 23/01/2013 | Slide 22
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Station at Ouagadougou Airport
Novatel Rx
Switch
Fuse
Server for monitoring and control
Choke Ring antenna
Control Tower
ESA Presentation | 23/01/2013 | Slide 23
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Correlation coefficient between the RMS of the post-fit residuals of a ionospheric model and other indices: Local Time (LT), AATR, DST, Ap and Solar Flux (SF).
23
onsa
RECEIVER LAT (Deg)
Correlation (x 100)LT AATR DST Ap SF
REYK 64 18 70 -25 30 27
ONSA 57 10 78 -33 35 13
POTS 55 11 83 -29 30 20
CAGL 37 26 74 -13 13 11
MAS1 27 47 72 -7 7 9
NKLG 0 52 69 -24 27 26
Associated to Solar terminator
High latitude receivers are more affected by geomagnetic activity
The study includes six different receivers (see map) during some tens of days with high ionospheric activity (all days with DST<-100nT are included).
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GEO Roadmap – Satellite view
INM-3F2 EoL
ARTEMIS EoL
INM-4F2
ASTRA-4B
ASTRA-5B
INM-3F5 EoL
NIGCOMSAT-1R
V3 GEO
V2 TEST V2 OP
V2 TEST
2020
V2 OP
2017 2018 2019
V2 OP
V2 OP
2011 2012 2013 2014
V3 TEST
2016
V2 TEST EGEP (TBD)
V2 TEST / EGEP
V3 TEST
Africa Test Bed / OP (TBD) Africa OP
TBD
20212015
V2 TEST
V2 OP
V3 OP
V3 OP
ESA Presentation | 23/01/2013 | Slide 25
ESA UNCLASSIFIED – For Official Use
Iono Scintillation, Effects on SBAS
In SBAS systems ionospheric scintillations shall be considered for their effects in the following:
System level:• Loss-of-lock (SNR) of GNSS satellites at system (RIMS) level• Increase number of cycle-slips at (RIMS) system level• Increased code-phase and carrier-phase noise at (RIMS) system level
User level:• Loss-of-lock of GEO or MEO• SBAS Data demodulation errors• Cycle-slips• Increased code-phase and carrier-phase noise (integrity to be protected?)
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