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SWEPOS™ – a Multi-purpose National Network of Reference Stations

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1 SWEPOS™ – a Multi-purpose National Network of Reference Stations
Lantmäteriet National Land Survey of Sweden Christina Kempe, Bo Jonsson, Gunnar Hedling and Peter Wiklund

2 How it started 1991: SWEPOS was established as a collaboration project
1992: Establishment of some experi-mental permanent reference stations 1994: A network of 21 stations in test operation : SWEPOS was designed and financed by a number of governmental agencies 2000-: Lantmäteriet is responsible for operation and development of SWEPOS

3 The Purpose of SWEPOS The purposes of SWEPOS are
Provide L1 and L2 raw data for post-processing Provide DGPS and RTK corrections Act as high-precision control points Scientific studies of crustal motion Monitor the integrity of the GPS system

4 The SWEPOS™ Network 21 complete stations 40 simplified stations
5 IGS stations: Kiruna, Mårtsbo, Borås, Onsala, Visby 7 EPN stations: Kiruna, Mårtsbo, Borås, Onsala, Visby, Skellefteå, Vilhelmina

5 Complete SWEPOS Station
Mounted on bedrock Power backup for 48 hours 64 kb leased lines for data communication and 19.2 kb lines for back-up Redundant GPS receivers, back-up computers and communication equipment Temperature and power monitoring Burglar alarm

6 Simplified SWEPOS Station
Antenna mounted on building Battery back-up for 30 minutes 64 kb data connection, no back-up line One GPS receiver, no back-up computer or communi-cation equipment Monitored by the 21 complete SWEPOS stations (daily)

7 Monitoring of SWEPOS Data In-door temperature Power supply
Data connections Visitors SWEPOS Control Centre

8 SWEPOS Data Post-processing data
Single-frequency RINEX – metre accuracy Dual-frequency RINEX – centimetre accuracy Real-time data L1/L2 data in receiver format DGPS data RTCM ver. 2.2 – metre accuracy Network RTK data (regionally) – centimetre accuracy

9 SWEPOS Real-time Services
EPOS™ (metre accuracy) DGPS service operated by Cartesia RDS channel on the FM radio band Omnistar (metre accuracy) WADGPS service operated by Fugro Satellite distribution Network RTK service (centimetre accuracy) Cellular phone (VRS mode)

10 Post-processing Service
Observation data (RINEX file) Computed position Quality parameters Post-processing Service

11 Network RTK in Sweden Network RTK for navigation and positioning with centimetre accuracy Pre-study projects Prototype Production Projects, National Positioning Service + Establishment Projects, 1 Jan 2004 Design Densification of the existing SWEPOS infrastructure Collaboration projects between Lantmäteriet and GPS users

12 Prototype Production Networks (2002-2003)
Pos. Stockholm- Mälaren 2 Väst-RTK SKAN-RTK 2 Experiences from the users Network RTK is efficient and easy to use The “GPS maturity” of the users is varying A high availability of the Network RTK service is required The coverage of suitable distribution channels is a bottleneck in some areas Standards for data format and GPS receivers are welcome

13 1 January 2004 Network RTK service 180 subscribers 1 Feb 2004
User fees for operation costs Starting fee: € 550/connection Unlimited data amount: € 1600 /year and connection Down-loaded data: € 550 /year and connection + € 0.5 /min 180 subscribers 1 Feb 2004 The cost for distribution of data via GSM is not included.

14 The Future Proposal on a National Network RTK service of 112 stations
2005 2006 2004 Proposal on a National Network RTK service of 112 stations Estimated investment cost of 4 million € and a yearly operation cost of 2.5 million € The investment is covered by governmental funds and the operation costs mainly by user fees The proposal is approved by the Director General

15 Applications today and in the future
2005 2006 2004

16 Conclusions A multi-purpose network of permanent stations is bene-ficial both for users and for the providers of national infra-structure for positioning and non-safety-of-life navigation. Further developments in standardisation, reliability and precision are desirable

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