DGPS navigation service based on VRS with local EGNOS back-up

Transcription

1 DGPS navigation service based on VRS with local EGNOS back-up EGNOS SERVICE PROVISION WORKSHOP, Warsaw, September 2016 Michael Hoppe German Federal Waterways and Shipping Administration

2 Overview Status of German DGPS radio beacon network Motivation for recapitalization VRS features and concept EGNOS as local backup solution Conclusion S5

3 German Radiobeacon Network Helgoland Zeven Groß Mohrdorf Mauken Koblenz Iffezheim Bad Abbach

4 German Radiobeacon Network System components (Classic Approach) Far-field Monitor (AM1) Far-field Monitor (AM 2) DGPS Reference Station Classic Approach IM RS TX1 LAN RS TX2 Local Analyzer MF-Transmitter and MF-Transmitting Antenna NtS Service S7

5 Reasons to recapitalize the DGPS-Network The coastal radiobeacon network was build up between 1994 and 1995 The Inland radiobeacon network was build up in 2003 Hard- and Software reaches life time end System becomes difficult to maintain S8

6 Reasons to recapitalize the DGPS-Network Remote Control Software is based on Windows NT Only a few spareparts exists for reference- and monitorreceivers Current system doesn t fulfill the requirements to separate services No possibility to transmit AIS message #17 S9

7 Recapitalization based on IALA R-121 (Network Approach using VRS concept) The VRS concept is based on GNSS corrections and integrity messages generated at a central VRS-Server The VRS concept supports the idea of separating the DGNSS functionality into different shore-based services: - DGN (DGNSS correction data service) - MF (medium wave service) - AIS service. The generated corrections will be transmitted from: - MF-Beacons (Conform to IALA R-121), - AIS-Shore stations (Conform to IALA A.124) and - future VDES for enhanced position accuracy. S10

8 VRS Server Functionality VRS-Server Handle Input data and Plausibility Check Correction generation Pre-Broadcast Monitoring Data formatting and distribution Data logging GNSS Status Configuration S11

9 VRS Server with In- and Outputs Ntrip: Network Transport of RTCM via IP COTS-GNSS-RX (far field monitor) Ntrip (RTCM 3.0) TCP/IP Ntrip (RTCM 2.3) TCP/IP DGNSS beacon site GREF-Network (BKG) via Ntrip-Caster Ntrip (RTCM 3.0 TCP/IP VRS-Server Hardware Client/Server (AIVDM) TCP/IP AIS-Server SAPOS-Network (ZSS) via Ntrip-Caster Ntrip (RTCM 3.0) TCP/IP Ntrip (RTCM 3.0) TCP/IP Phase corrections for high accuracy applications S12

10 VRS Server Functionality (schematic) n GNSS raw data sources (RS) Plausibility check Generation of Corrections for n VRS Configuration for Schedule and msg. # 16 and #27 PRCn,RRCn RTCM Message Generator m GNSS raw data sources (MS) Plausibility check Pre-Broadcast-Monitoring Generate msg: # 1 or 9-3 (#6) # 3 # 16 # 27 S13

11 VRS Feautures Advantages: The GNSS-receivers (used for data input) could be off-the-shelf Future GNSS-Signals (GLONASS and Galileo) integration is easy The software is based on well-known principles The concept can be realized with moderate investment costs Performance enhancements can be expected Several radio communication links can be served Disadvantages: Availability of the service dependent on communication links

12 Planned Recapitalization of IALA radiobeacon inland service based on the network approach (IALA R- 121) with local EGNOS backup S15

13 Requirements for IWW Applications Application Inland ECDIS (IES) Navigation Accuracy [m] Integrity < 5 IMO A.915(22) Inland AIS (VTT) - Medium-term ahead - Short-term ahead - Lock/Bridge operation IMO A.915(22) IMO A.915(22) Future Applications (IRIS-EU-II SuAc 2.2) - Ship Guidance Systems - Bridge waring system - Autopilot 0,1 0,1 (3D) 0,5 TBD TBD TBD

14 Planned new system components - general system architecture VRS-Server DGPS-Referenzstation Bad Abbach DGPS-Referenzstation Iffezheim Sekundär Server Primär Server RTCM(MW DGPS) Ntrip GNSS Backup Steuerung Modulation Ntrip GNSS Backup Steuerung Modulation GNSS- Rohdatenquellen - WSV Stationen - GREF ( BKG) - SAPOS (ZSS) RTCM 3.x RTCM 3.x Qualitätsprüfung Korrekturdatenberechnung PBM Datenverteilung AIVDM (AIS #17) RTCM(MW DGPS) AIVDM (AIS #17) BVBS WAN-Netz DGPS-Referenzstation Mauken BMBS WAN-Netz DGPS-Referenzstation Koblenz Ntrip GNSS Backup Steuerung Modulation Ntrip GNSS Backup Steuerung Modulation AIS Landstationen AIS Landstationen AIS Landstationen AIS Landstationen BMBS WAN-Netz S17

15 Planned new system components - local radio beacon site VRS-Server DGNSS-Referenzstation MW-Sender/Antene PCI Chassis RTCM 3.x GNSS- Rohdaten quellen RTCM 3.x Sekundär Server Primär Server Ethernet PC MSK(1) MSK(2) Lokales GNSS Backup D/A-IO Ethernet BVBS WAN-Netz Reception of GNSS-Corrections from central VRS-Servers New Hard- and Software for modulation and remote control Local Backup to mitigate network interruptions S18

16 Local Backup functionality - Based on a local GNSS receiver and EGNOS Local GNSS receiver provides raw data EGNOS provides GPS corrections in RTCA format from SIS Transform RTCA into RTCM Perform PBM with EGNOS corrections using the local GNSS raw data Generate RTCM standard messages for output S19

17 GNSS correction selection hierarchies Correction selection process at transmission site GNSS (GPS+ GLONASS) corrections from Primary VRS Server GNSS (GPS+ GLONASS) corrections from Secondary VRS Server Local EGNOS based GPS corrections S20

18 Conclusions The existing German radio beacon network is currently based on the classic approach (old IALA R-121) Recapitalization is required and will be performed using the network approach based on VRS concept (new IALA R-121) To mitigate network limitations a local backup based on EGNOS SIS data will be used The WSV is currently implementing this solution for the IWW network S21

19 Thank you for your attention Michael Hoppe German Federal Waterways and Shipping Administration Traffic Technologies Centre Am Berg 3 D Koblenz Germany Michael.Hoppe@wsv.bund.de Questions? S22