EDAS differential GPS corrections for Smartphones · Precision vs solution type 26/06/2019 GRMTF...
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EDAS differential GPS corrections for Smartphones
GRMTF 2019
J. Morán - ESSP SAS
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TABLE OF CONTENTS
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EDAS Overview
EDAS Use Cases
EDAS DGPS For Smartphones
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EDAS Overview
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Dedicated Infrastructure
Transmission Channel - Internet
Wide range of products, formats and protocols
Robust to GNSS vulnerabilities (jamming, spoofing, masking...)
Network vulnerabilities (hacking threats, coverage, etc.)EGNOS SOL
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EDAS Services
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EDAS Service
Type of Data Service Description
OBS & NAV
EGNOSMSG
RTKMSG
DGNSS COR
FORMAT PROTOCOL
Real Time
Service Level 0
Data Filtering SL0
ASN.1 EDAS
Service Level 2
Data FilteringSL2
RTCM3.1 EDAS
SISNET RTCA SISNeT
NtripRTCM 2.xRTCM 3.1
Ntrip(v1, v2)
Archive FTP RINEX, EMS,IONEX…
FTP
Other position techniques enabled by
EDAS DGNSS, RTK
EDAS Proprietary protocol based on
SSL Enhanced Security
EGNOS Message consolidated from all
RIMS Robustness
Ephemeris and EGNOS Messages
request TTFF (A-GNSS)
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TABLE OF CONTENTS
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EDAS Overview
EDAS Use Cases
EDAS DGPS For Smartphones
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Rail
Road
GNSS Algorithms & Test-Beds
Aviation
Maritime
GNSS performance monitoring
Location Based Services (LBS)
Surveying/mapping/agriculture
Some commercial EDAS use cases…
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GNSS Performance Monitoring
• Commercial tools powered by EDAS.
• Real-time and post-processing options.
Tracking of assets/fleet management
• Continuous monitoring of commercial fleets
• Homogeneous augmented solution (Rx independent)
Delivery of navigation services
• EDAS based DGPS service for maritime users
• High accuracy correction services
Access to High quality GNSS data
• Assisted GNSS applications
• Additional stations for correction services
*EDAS Commercial / Professional Active Users Per Segment
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Multiple correction streams:Improved accuracy for mobile apps
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DGNSS CorrectionsHorizontal Accuracy : 0.5 - 1m (95%)Coverage: ~ up to 260 km from EGNOS station
RTK MessagesHorizontal Accuracy : < 0.1m (95%)Coverage: ~ up to 50 km from EGNOS station
Consolidated SBAS messageHorizontal Accuracy: 1m (95%)Coverage: ~ Europe (EGNOS OS)
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TABLE OF CONTENTS
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EDAS Overview
EDAS Use Cases
EDAS DGPS For Smartphones
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Preliminary Results:The importance of measurements smoothing
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No
isy
Co
de
Mea
sure
men
ts
Smo
oth
ing
filt
erre
qu
ired
PVT Solution
Raw
Smoothed (GPS Only)
Raw
Smoothed (GPS Only)
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Raw
Smoothed (GPS Only)
Smoothed (EDAS DGPS)
Smoothed (EGNOS)
Preliminary Results:Precision vs solution type
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Solution Type AvailabilityHorizontal Level Vertical Level
Average Standard Deviation 95 Percentile Average Standard Deviation 95 Percentile
Raw 56% 3.13 1.75 6.50 5.08 4.84 14.69
Smoothed (GPS only) 100% 0.58 0.24 0.92 0.94 0.77 2.62
Smoothed (EDAS DGPS) 100% 0.31 0.17 0.59 0.56 0.41 1.40
Smoothed (EGNOS) 100% 0.33 0.16 0.60 0.57 0.43 1.39
Horizontal Precision Analysis (95%)
Smoothed vs Raw: 85% ImprovementEDAS DGPS vs GPS (smoothed): 36 % ImprovementEDAS DGPS vs EGNOS: Similar Performance
* No reference position available for this test numbers included in this table should be only considered for precission assessment
(i.e. no accuracy information provided)
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www.essp-sas.eu
+34 911 236 555 (H24/7)
http://egnos-user-support.essp-sas.eu
Corporate Video
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