EGNOS Ionosphere Related Activities

S. Schlüter, R. Prieto-Cerdeira

SBAS IWG New Delhi 05-07/02/2014 ESA UNCLASSIFIED – For Official Use

Topics

1. EGNOS V2.x.x Ionosphere Related Activities 2. EGEP Ionosphere Related Activities: 1. EGNOS V3 2. EGEP Activities for the Characterization of the Ionosphere 3. Activities with African Countries and External Partners 3. Status/Way forward ESA Presentation | 23/01/2013 | Slide 2 ESA UNCLASSIFIED – For Official Use

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 activit y ...

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 3 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 4 ESA UNCLASSIFIED – For Official Use

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 5 ESA UNCLASSIFIED – For Official Use

Definition of an Indicator of Ionospheric Activity

Along-Arc TEC Rate (AATR) indicator

the hourly Root Mean Square (RMS) of “weighted” Along-Arc Vertical TEC Rate .

as Where D t can be 30 or 60 seconds

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.

ESA Presentation | 23/01/2013 | Slide 6 ESA UNCLASSIFIED – For Official Use 28 April, 2020

AATR

The European GNSS Programmes  

M

D

STEC

 2

onsa

D

t

Stations used for AATR RMS computation 6

Generation of Ionospheric Reference Scenarios

Requirement CDF of AATR RMS (Different for 3 Geomagnetic Regions) 3D Iono Model AART RMS ESA Presentation | 23/01/2013 | Slide 7 ESA UNCLASSIFIED – For Official Use Selection of periods and data Reference Scenarios

RDG

Developed Scenarios

ESA Presentation | 23/01/2013 | Slide 8 ESA UNCLASSIFIED – For Official Use

Scintillation Performance Analysis

Separate Receiver effects from System effects ESA Presentation | 23/01/2013 | Slide 9 ESA UNCLASSIFIED – For Official Use

Scintillation Specifications (preliminary)

ESA Presentation | 23/01/2013 | Slide 10 ESA UNCLASSIFIED – For Official Use

EGEP ID 66: MONITOR II Contributing Receivers & Product Data

Core for future EGNOS Iono related activities Launch of activity: March 2014 ASECNA Project

Users

EGNOS V2 & V3 Projects Laboratories CNES DLR MONITOR II IONO Repository & Products Processing Testbeds GALILEO Project CNES Others..

ICASES I & II Others… ESA Presentation | 23/01/2013 | Slide 11 ESA UNCLASSIFIED – For Official Use

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 12 ESA UNCLASSIFIED – For Official Use

MONITOR: Ionospheric Experimental Station Network

ESA Presentation | 23/01/2013 | Slide 13 ESA UNCLASSIFIED – For Official Use Central Archiving and Processing Facility

Activities with African Countries and External Partners



ESA/CNES Activities with ASECNA SAGAIE network

 

Collaboration with SANSA Collaboration with additional partners TBD at next IONO SBAS meeting

ESA Presentation | 23/01/2013 | Slide 14 ESA UNCLASSIFIED – For Official Use

Air Traffic Control Agency ASECNA (Agency for Aerial Navigation Safety in Africa and Madagascar)

SAGAIE: Two Stations Architectures

Architecture 1: Dakar, Lomé FLEXPAK6 Novatel Rx, GPS GLO GAL data Collection splitter NovAtel FlexPak6 Rx PolarXS Septentrio Receiver, GPS, GLO, GAL data collection and scintillations parameters INTERNET Septentrio PolarXs Rx GEA e-survey Centre de contrôle (e-survey) Archive all raw data measurements, Rinex it, and send it to Toulouse Bitgrabber RF GEMS Bitgraber : 2XUSRPN200 for RF signal recording Architecture 2: Douala, Ouagadougou, Ndjamena splitter NovAtel Rx FlexPak6 ESA Presentation | 23/01/2013 | Slide 15 ESA UNCLASSIFIED – For Official Use e-survey INTERNET Centre de contrôle (e-survey)

Data Flow between ASECNA/SAGAIE Network and MONITOR CPF

ASECNA

External data flow

ESA/MONITOR CNES

CNES SAGAIE Stations Stations raw Data FTP Server Data archiving Rinex 3 + ISMR data Monitor CPF High level iono Products ESA MONITOR Stations High Quality Multi-GNSS Receiver Network ESA Presentation | 23/01/2013 | Slide 16 ESA UNCLASSIFIED – For Official Use

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 the Crest (profile, HmF2 and FoF2) ESA Presentation | 23/01/2013 | Slide 17 ESA UNCLASSIFIED – For Official Use

Status

On-going & Future Activities:

 On-going activities to further improve and optimize GIVD/GIVE algorithms in EGNOS V2 releases related  Preparation of EGNOS V3 Phase C/D tools and specifications) (Refinement and consolidation of  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 18 ESA UNCLASSIFIED – For Official Use

Many Thanks for Your Attention!

ESA Presentation | 23/01/2013 | Slide 19 ESA UNCLASSIFIED – For Official Use

SAGAIE MAIN FEATURES

1.

SAGAIE

=

S

TATIONS

A

SECNA

G

NSS for

A

NALYSE of the

I

ONOSPHERE

E

QUATORIALE 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 20 ESA UNCLASSIFIED – For Official Use

Step 1 service area – for analysis during Phase B

ESA Presentation | 23/01/2013 | Slide 21 ESA UNCLASSIFIED – For Official Use

Station at Ouagadougou Airport

Novatel Rx Switch Fuse Choke Ring antenna Control Tower

ESA UNCLASSIFIED – For Official Use

Correlation coefficient indices Flux (SF).

between the RMS of the post-fit residuals of a ionospheric model and other : Local Time (LT), AATR, DST, Ap and Solar onsa RECEIVER REYK LAT (Deg)

64

ONSA POTS

57 55

CAGL MAS1 NKLG

37 27 0

LT

18 10 11 26 47 52

Correlation (x 100) AATR DST Ap 70

-25 30

78 83 74 72 69

-33 -29 -13 -7 -24 35 30 13 7 27

SF

27 13 20 11 9 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) .

23

GEO Roadmap – Satellite view

2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021

V2 OP TBD

EoL INM-3F2

EGEP (TBD)

ARTEMIS

V2 OP V2 TEST

EoL

V2 OP V2 TEST / EGEP V3 TEST

INM-4F2 ASTRA-4B

V2 TEST

ASTRA-5B

V2 TEST V2 TEST V2 OP V2 OP V3 OP V3 OP

INM-3F5 EoL NIGCOMSAT-1R V3 GEO

ESA UNCLASSIFIED – For Official Use Africa Test Bed / OP (TBD) V3 TEST Africa OP

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?) ESA Presentation | 23/01/2013 | Slide 25 ESA UNCLASSIFIED – For Official Use