# Presentation: 339592

## CZEPOS – a Multipurpose Positioning System for the Czech Republic

*Oldřich Pašek* – Czech Office for Surveying, Mapping and Cadastre
*Jan Řezníček* – Land Survey Office
*Jakub Kostelecký* – Research Institute of Geodesy, Topography and Cartography

- Czech Office for Surveying, Mapping and Cadastre

## CZEPOS

- CZEPOS - an active network of permanent GNSS stations in the Czech Republic
- built up by the Czech Office for Surveying, Mapping and Cadastre and its organizations
- Land Survey Office
- Research Institute of Geodesy, Topography and Cartography

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005

## Objectives 

- to foster the implementation of GNSS techniques in the Czech Republic
- to support a broad spectrum of GNSS based applications in positioning and navigation
- to economize precise geodetic surveying and to bring better comfort to surveyors
- to harmonize the national geodetic infrastructure with the EU countries and to facilitate the implementation of ETRS

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005

## Benefits for Users 

**Navigation community****:** CZEPOS enables the user with a simple receiver to make a real time positioning with an accuracy of some decimeters
**Surveying and geodetic community****:** CZEPOS enables to speed-up and to economize precise geodetic measurements (one geodetic receiver is sufficient)

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005

## Services and Products 

**Real-time services****:**
- additional information from the reference station for DGNSS (differential GNSS)
- RTK (Real-Time Kinematic) using *VRS (Virtual Reference Station)* - a combined solution based on the data from several reference stations when the user is provided with a *software generated *additional information from a near-by *virtual* reference station
- RTK using *FKP (Flächenkorrekturparameter - Areal Correction Parameters)* - a *software generated *additional information from a reference station is extended by correction parameters that enable to use it even at longer distances from the reference station
**Post-processing products:**
- data files for further processing

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005

## Products for Navigation 

- Navigation community is mainly interested in a real-time DGPS service
- DGPS service (like other real-time services) will be provided
- through a phone link via ISDN Router – supposing that the user has an access to a GSM operator
- through the *internet *- supposing availability of a mobile phone GPRS option; the user can connect via *internet *to the access server and get necessary data in the Ntrip format

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005

## Network Structure 

- 26 stations communicating with three mutually linked to 3 central servers
- servers are located at the Land Survey Office
- 22 stations are located at cadastral offices
- 4 external stations are operated by academic institutions through the VESOG network

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005

## Distribution of Stations 

- red - operated by cadastral offices, green - operated by academic institutions

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005

## Hardware and Software

- Czech Office for Surveying, Mapping and Cadastre put out a public tender in May 2004  receivers Leica GRX 1200 Pro, antennas Leica AT504 Choke Ring
- External stations  receivers Ashtech, Topcon
- absolute antenna calibration
- station control + data for post-processing  Leica Software Spider
- real-time services  software GNSMART of Geo++ Company

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005

## Implementation Plan I

- 6 stations have been operational since December 2004 (Pardubice, Svitavy, Jihlava, Dačice, Tábor, Příbram).

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005

## Implementation Plan II

- software GNSMART currently being installed  launch of real-time services and post-processing products from the first six stations
- further 11 stations will be set into operation in 2005
- complete network will be finished in 2006

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005

## CZEPOS and EUPOS 

- Organizations of the Czech Office for Surveying, Mapping and Cadastre participate in the EUPOS (European Positioning System) project directed towards establishment GNSS permanent networks in the Central- and East European countries - see a special presentation on this topic
- Incorporation of CZEPOS into EUPOS will be possible by necessary SW and HW extension and upgrade following from the introduction of the new European GNSS system GALILEO

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005

## Conclusions

- CZEPOS is a part of a new geodetic infrastructure for referencing spatial geoinformation
- more information:
-     http://czepos.cuzk.cz/ (in Czech)

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005

## Thank you for your attention 

- European Meeting of the International Information Sub-Committee of the Civil GPS Service Interface Committee. Czech Technical University, Prague, March 14-15, 2005