Dipl.-Ing. Dirk Stöcker EuroNav Service GmbH CGSIC/IISC 14-15.03.2005

Dipl.-Ing. Dirk Stöcker EuroNav Service GmbH CGSIC/IISC 14-15.03.2005

Networked

DGPS

via Internet


Do we need networked DGPS?Do we need networked DGPS?

EuroNav DGPS network software

Internet and geodetic data

Conclusions


• S/A ~ 50-100m 5 – 15m

• WADPS 1 – 2 m

- EGNOS (summer 2005)

- ESTB/WAAS (working)

- SISNeT (higher availability)

• single base station DGPS 0.5 – 2m

- inhomogeneous or local only coverage

http://www.ga.gov.au/nmd/geodesy/argn/saplots/darw_hat.gif


User requirements for broadcast services

• ~ 5 m current car navigation, ...

• ~ 1 m lane accuracy in car navigation, ...

• ~ 0.5 m forestry, farming, aviation, ...

• ~ 0.01 m geodetic users, science, ...

> 5 m absolute GPS

5 m – 1 m DGPS

~ 0.50 m networked DGPS

< 0.50 m RTK


• DGPS users not interested in raw position

• integration in business processes solutions

• acceptance depends on pricing and savings

• market requires reasonable price and easy access few reference stations cheap communication (provider and user)

possibly densification with RTK when required


Do we need networked DGPS?

EuroNav DGPS network softwareEuroNav DGPS network software


Conclusions


EuroNet GNSS Software

• full featured single station GNSS processing software

• module for generating network based DGPS

• internet support for data acquisition and data export (NTRIP)

• raw data management and distribution (together with EuroRef)

• source code available, cooperations possible

• soon: higher accuracy (networked RTK)


Hungary – Kaposvar


Hungary – Kaposvar


Hungarian test

• 5 reference stations enough for whole country

• homogeneous coverage

• availability depends on redundance (no single point of failure)

„With the help of this sofware reference station networks can be densified with lower budget and single-station failures can be handled without significant performance degradation.“ Tamás Horváth (FÖMI-SGO)


WWW based monitoring

• display of software states (e.g. data availability)

• monitoring positioning

• display ionospheric influence (RTCA based)

• history for comparisons

• monitoring satellite visibility (station shadowing)

• remote access

• . . .







Internet and geodetic dataInternet and geodetic data

Conclusions


Internet based (NTRIP) raw data delays are ~ 1-2 seconds


Why using the Internet for data transfer?

• available nearly everywhere

• standardized protocols (TCP/IP, RTCM-NTRIP)

• cheaper than most other solutions

• better availability using redundancy

• remote administration

• easy monitoring

Why not?

• Hacking, viruses security concept required


Reference station: NtripS 05

• GNSS receiver drivers

• generating RINEX

• direct NTRIP upload

• WWW administration

• special hardware for long maintenance freedom

• security enhanced software

• automatic updates

• developed in cooperation with Internet Media Solutions


EuroRef Software

• flexible UNIX based reference station software

• supports lots of receiver types, data types and settings

• support for internet based real time data access

• minimum hardware requirements (100MHz systems work fine)

• export to standard formats (e.g. RINEX)

• sold seperately from NtripS 05 as well





ConclusionsConclusions


Networked DGPS via Internet:

• easy, cheap, reliable, homogeneous

• cooperations between data sources and service providers

• DGPS networking increases accuracy and reliability

• many advantages for controling and monitoring

• EuroNav provides

EuroRef reference station software

EuroNet DGPS network software

NtripS 05 reference station hardware


Thanks for your

attention and

feel free to ask.

http://www. .de/

[email protected]

Documents

Dipl.-Ing. Dirk Stöcker EuroNav Service GmbH CGSIC/IISC 14-15.03.2005