Cross-Border EUPOS Data Exchange First Experience

Transcription

1 Cross-Border EUPOS Data Exchange First Experience Eimuntas Paršeliūnas, Marius Petniūnas, Domantas Bručas (Institute of Geodesy of Vilnius Gediminas Technical University, Lithuania) Wieslaw Graszka (Head Office of Geodesy and Cartography, Poland) Janis Zvirgzds (Latvian Geospatial Information Agency, Latvia)

2 Outline EUPOS policy on cross-border data exchange Overview of EUPOS clusters Hardware issues Software issues Geodetic Coordinates issues Geodetic Heights issues Future plans Conclusions

3 EUPOS policy on cross-border data exchange (1) Guidelines For Cross-Border Data Exchange, Version 1.0, 21 September 2006 : EUPOS services are designed so that homogeneous DGNSS and Network RTK positioning performance can be guaranteed throughout the whole EUPOS coverage area. The exchange of raw GNSS measurements of reference stations located close to the borders can help each other s EUPOS National Service Centres (NSC) to extend the homogeneous service coverage areas to the borders. It is important therefore to provide real-time GNSS exchange data in the formats that are supported by all national EUPOS network operators. Raw GNSS data exchange between neighbouring EUPOS member countries must be based on bilateral agreements.

4 EUPOS policy on cross-border data exchange (2) Guidelines For Cross-Border Data Exchange, Version 1.0, 21 September 2006 : It is recommended therefore that the EUPOS member countries also use the RTCM standards for cross-border data exchange. It is recommended that EUPOS networking centres exchange data format is RTCM 3.x. Proprietary raw data formats are not recommended for EUPOS crossborder data exchange and are only accepted temporarily if RTCM standard data formats are not supported by a networking centre due to software limitations. For post-processing purposes it is recommended to exchange data in the standard format independent from the receiver RINEX 2.11 or 3.0.

5 EUPOS policy on cross-border data exchange (3) Exchange data contents: raw carrier phase and code observations on both GPS frequencies (L1 and L2), ephemeris information, time information, signal strength information (carrier-to-noise = CNR), ETRS 89 coordinates of the Antenna Reference Point (ARP) with height information, antenna type descriptor and antenna serial number.

6 EUPOS policy on cross-border data exchange (4) Recommended data format and Message Types: Recommended data format is RTCM version 3.1. Recommended messages are 1004 (1003), 1006 (1005), 1008 (1007), 1012 (1011), 1019.

7 EUPOS policy on cross-border data exchange (5) RTCM 3.1 Recommended Message Types

8 EUPOS policy on cross-border data exchange (6) Transmission method, transport protocol Networking centre to Networking centre data transmission is preferred. For the dissemination of the real-time exchange data streams the NTRIP (Networked Transport of RTCM via Internet Protocol) transport protocol is recommended. It is also accepted to transmit raw data streams via direct TCP/IP or UDP (if supported by the networking software) connections. It is recommended to use secure Virtual Private Network (VPN) tunnels for direct TCP/IP or UDP server-client communication.

9 Overview of EUPOS clusters (1)

10 Overview of EUPOS clusters (2) LATVIA GPS Base Station Network LatPos 19 stations + 3 LitPOS

11 Overview of EUPOS clusters (3) GPS Base Station Network LatPos: architecture 4 server computers Software: SpiderNet

12 Overview of EUPOS clusters (4) LITHUANIA GPS Base Station Network LitPOS: scheme

13 Overview of EUPOS clusters (5) GPS Base Station Network LitPOS: instrumentation Instrumentation of 15 stations: Instrumentation of 10 stations: Trimble NetRS receivers with Chock Trimble 5700 receiver with Zephyr ring antennas, geodetic antennas, TRIMMARK 3 RADIO MODEMS, Com server, PTU200 Combined pressure, humidity DSL modem, and temperature transmitters, AC adapter 12V, DSL modem, e-power Switch, AC adapter 12V, UPS, e-power Switch, electric power gauge. UPS, electric power gauge.

14 Overview of EUPOS clusters (6) GPS Base Station Network LitPOS: architecture Data float scheme of a single station

15 Overview of EUPOS clusters (7) GPS Base Station Network LitPOS: architecture LitPOS hardware at operating centre consists of 3 PC and 2 servers

16 Overview of EUPOS clusters (8) GPS Base Station Network ASG-PL: scheme POLAND

17 Overview of EUPOS clusters (9) GPS Base Station Network ASG-PL: instrumentation 84 GPS stations, 14 GPS/GLONASS stations, about 30 foreign stations. GIZY

18 Overview of EUPOS clusters (10) GPS Base Station Network ASG-PL: architecture

19 Overview of EUPOS clusters (11) GPS Base Station Network ASG-PL: RAW data exchange

20 Hardware issues (1) GPS Base Station Network LitPOS: architecture Before expansion After expansion International Symposium on Global Navigation Satellite Systems, Space-Based and Gr ound-based Augmentation Systems and Applications, Berlin, November 2008

21 Hardware issues (2) GPS Base Station Network LitPos: architecture After expansion

22 Hardware issues (3) LitPOS: latency

23 Hardware issues (4) LatPos: latency LatPos latency average 10 ms From Lithuania: Leica network - from 0 to 25 ms LitPOS network - 68 ms

24 Software issues (1) Adding stations from neighbouring networks Step 1: Module insertion

25 Software issues (2) Adding stations from neighbouring networks Step 2: Naming the module and preparing for configuration

26 Software issues (3) Adding stations from neighbouring networks Step 3: Adding IP and port in NTRIP Client

27 Software issues (4) Adding stations from neighbouring networks Step 4a: Requesting source table and choosing the mountpoint

28 Software issues (5) Adding stations from neighbouring networks Step 4b: Requesting source table and choosing the mountpoint

29 Software issues (6) Adding stations from neighbouring networks Step 5: Adding, choosing name and socket server

30 Software issues (7) Adding stations from neighbouring networks Step 6: Choosing the port to pass data to GPSNet

31 Software issues (8) RAW data transmitting via NTRIP caster split to

32 Software issues (9) RAW data transmitting via NTRIP caster mountpoints

33 Software issues (10) RAW data transmitting via NTRIP caster source table

34 Software issues (11) RAW data transmitting via NTRIP caster mountpoint settings

35 Coordinates issues (1) Coordinate monitor International Symposium on Glo bal Navigation Satellite Systems, Space-Based and Ground-Based Augmentation Systems and Applications, Berlin, November 2008

36 Coordinates issues (2) Stations of the NKG 2003 campaign (repeated in 2008!)

37 Coordinates issues (3) Geodetic coordinates in ETRS 89 epoch (based on ITRF 2000) for a subset of the NKG2003 campaign Station Latitude Longitude Height ARAJ INDR IRBE KANG RI RIGA KLPD L L L L VLNS Estimated accuracy: cm (95%) for the horizontal co-ordinates and 1-2 cm (95%) for the vertical at the epoch of the observation.

38 Coordinates issues (4) Comparison to other ETRS 89 realizations ETRS 89 based on NKG 2003 minus EUREF-BAL 92. Unit: mm. Point N E U ARAJ INDR KANG RI L L L L RMS

39 Coordinates issues (5) Comparison to other ETRS 89 realizations ETRS 89 based on NKG 2003 minus EUREF-POL 92. Unit: mm. Point N E U RI L L JOZE RMS

40 Coordinates issues (6) Comparison to other ETRS 89 realizations ETRS 89 based on NKG 2003 minus EUREF-POL Unit: mm. Point N E U BOR JOZE LAMA WROC RMS

41 Coordinates issues (7) LitPOS

42 Coordinates issues (8)

43 Heights issues (1)

44 Heights issues (2) International Symposi um on Global Navigation Satellite Systems, Space-Based and Ground-Based Augmentation Systems and Applications, Berlin, November 2008

45 Heights issues (3)

46 Heights issues (4) The a-posteriori standard deviations computed by variance component estimation Oesterreich Finnland Belgien Schweden Schweiz Tschechien Deutschland Dänemark Spanien Ungarn Slow.,Kroa.,Bosn/Hz. Polen Frankreich Slowakei Italien Rumänien Niederlande Estland Portugal Lettland Grossbritannien Norwegen1 Norwegen LitauenEp.2000 Bulgarien

47 Heights issues (5)

48 Future plans -LitPOS

49 Future plans - LatPos

50 Future plans -LitPOS Adoption of vertical (height) and gravity systems 2008 Connections to vertical networks of Poland and Latvia ( ) Second order vertical network

51 Conclusions Active GNSS stations networks improve the national reference systems and fulfil requirements of many users for threedimensional positioning. Active GNSS stations networks are compatible with systems in neighbouring countries due to use unified EUPOS standards for cross-border data exchange. Cross-border exchange of GNSS observation data from the reference stations is realised through NSC only. Unification of the coordinate and heights systems should be organised at European level (at least at regional level).

52 eupos.vgtu.lt Web site

53 THANKS FOR YOUR ATTENTION!