mitigation of space weather threats to gnss services...new advanced gnss and 3d spatial technologies...
TRANSCRIPT
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Mitigation of space weather
threats to GNSS services
http://misw.info/
Recent developments towards the
estension of EGNOS into Africa
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Beneficiaries
1. UNIVERSITY OF BATH (UK)
2. THALES ALENIA SPACE ITALIA SPA
3. THALES ALENIA SPACE FRANCE
4. THE UNIVERSITY OF NOTTINGHAM (UK)
5. POLITECNICO DI TORINO POLITO (Italy)
6. ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA (Italy)
7. EISCAT SCIENTIFIC ASSOCIATION (Sweden)
8. JRC JOINT RESEARCH CENTRE - EUROPEAN COMMISSION (Belgium)
9. DANISH TECHNOLOGICAL UNIVERISTY (Denmark)
10. CENTRUM BADAN KOSMICZNYCH POLSKIEJ AKADEMII NAUK (Poland)
11. SVEUCILISTE U ZAGREBU FAKULTET ELEKTROTEHNIKE RACUNARSTVA UNIZG-FER(Croatia)
12. MET OFFICE (UK)
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
The concept of SBAS
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
WAAS CONUS
Credit: FAA
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
SBAS coverage
Credit: ESA
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
The limitations to the extension of SBAS into low latitudes
1. Mapping techniques do not accommodate strong gradients
2. The ground network of reference receivers are not robustin tracking through scintillation events,
3. Accurate fore-warning of significant space weather eventsis not available
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Objectives
1. To monitor and characterise ionospheric gradients and scintillation atlow, high and middle latitudes
2. To quantify the impact of ionospheric gradients and scintillation onsatellite navigation signals, receivers, and overall satellite navigationsystems.
3. To develop innovative algorithms to mitigate against space weathervulnerabilities (i.e. scintillation) at receiver level (including Galileosignals).
4. To develop innovative algorithms to mitigate against space weathervulnerabilities (i.e. ionisation gradients and scintillation) at servicelevel, e.g. SBAS.
5. To devise recommendations on best practices for GNSS futureservices with reference to space weather.
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
The problem of ionisation gradients
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
How to calculate corrections to ionopheric delays
Credit: RTCA
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
How to calculate corrections to ionopheric delays
Credit: RTCA
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Example of ionispheric grid points
Credit: RTCA
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
EGNOS monitoring stations – courtesy ESSP
Credit: ESSP
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Storm: peak Storm: off-peak
Examples of ionisation structures over Europe
Credit: MIDAS
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Examples of ionisation structures over European high latitudes
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
23 June 2015Trondheim (63.42 N, 10.41 E)
23 June 2015Ny Alesund (78.93 N, 11.06 E)
Rate of Change of TEC and Scintillation
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Examples of ionisation structures over African low latitudes
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Examples of ionisation structures over Africa
Example TEC maps over Africa
Credit: MIDAS
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
An additional problem at low latitudes:scintillation
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
An additional problem: scintillation
10 March 2012 PRN31
L1
L2
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
An additional problem: scintillation
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
L1 L2
An additional problem: scintillation
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Scintillation: a night-time phenomenon
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Up to 4
consecutive
minutes
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Modelling ionisation structures over Africa
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Simulated
Reconstructed
1. Complexity
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
2. Data coverage
2009Low data coverage
2015 +simulated
receiversHigh data coverage
95% confidence
Sahara desert
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Modelling EGNOS performance over Africa
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Data from SAGAIE network – courtesy of CNES
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
TECU/sec
TECU
Temporal TEC gradient from all the stations in the chosen area
Spatial TEC gradient between two close IPPs
Ionisation gradients – October 2015
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
0 5 10 15 20 250
10
20
30
40
50
60
70
Cumulated LoL duration per hour
Niamtougou - 11/10/2015 - Septentrio
Hour of day [h]
Cum
ula
ted L
oL d
ura
tion [s]
L1
L2
Data gaps introduced by ionospheric scintillation – October 2015
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
08 – 12 LT 12 – 16 LT
EGNOS availability over the chosen area
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
EGNOS availability over the chosen area
16 – 20 LT 20 – 24 LT
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
San-Pedro
Brazzaville
New sites for the two GISMO units
Sites proposed for MISW stations
Sagaie stations
Additional ESA stations in the region (awaiting REA confirmation)
Potential use of stations in the Eastern African region (through SANSA, awaiting SCINDA - BC confirmation)
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Improving the performance of monitoring stations in Africa
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Modelling on GISMO receiver
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Trieste, 18-20 February 2016New Advanced GNSS and 3D Spatial Technologies – “G. Manzoni” Workshop
Thank you for the attention