Using GSM/GPRS Technology For Generation Of Precise Digital Terrain Model (DTM) Adam Ciećko, Bartłomiej Oszczak, Stanisław Oszczak www.kgsin.pl Chair of Satellite Geodesy and Navigation, University of Warmia and Mazury in Olsztyn, Poland 8th Bilateral Geodetic Meeting Poland-Italy Italy; Wrocław aw,, Poland, 22-24 24 June 2006
Outline GSM/GPRS system for data teletransmission Static tests of designed system Dynamic DTM creation and dynamic tests of the system with centimeter level of accuracy Statistical analyses of various GPS techniques Precise DTM generation Conclusions
GSM/GPRS system for data teletransmission The project is run and coordinated by the Chair of Satellite Geodesy and Navigation, Warmia and Mazury University in Olsztyn, Poland in cooperation with: Biatel S.A. in Bialystok, Polkomtel S.A. in Warsaw, Maritime Office in Gdynia, Naval Academy in Gdynia.
GSM/GPRS system for data teletransmission Growing need of GPS real-time, precise and reliable applications, where stable and not expensive wireless connection is essential Precise navigation Land surveying Vehicle (fleet) monitoring Limitations of classical UHF radio-modems
GSM / GPRS General Packet Radio Service Advantages No costs of building a network Easy to define costs of using Low rates of data teletransmission Fast enough speed of transmission Rare breakdowns and redundancy (3 operators in Poland) Good coverage Low cost of the user equipment
GSM/GPRS system for data teletransmission Direct Transmission Phase 1 (P2P connection) Reference Station GPRS Modem GPRS NETWORK GPRS Modem GPS Receiver Sending DGPS/RTK corrections via direct transmission» connection is limited to only two modems
GSM/GPRS system for data teletransmission GPRS modem special, dedicated to our purposes GPRS modem compact in size not heavy operated by just one switch possibility of upgrading the modem s software GPRS Modem 10 cm (4 in.)
GSM/GPRS system for data teletransmission Phase 2 (server of corrections) Sending DGPS/RTK Corrections via Server of Corrections Reference Station GPRS Modem Server of Corrections GPRS Modem GPS Receiver Reference Station GPRS Modem GPRS NETWORK GPRS Modem GPS Receiver Reference Station GPRS Modem» unlimited number of users» delays in transmission
GSM/GPRS system for data teletransmission Phase 3 (IPSEC tunnels ) - Initial Operational Capability status INTERNET TERMINAL GPRS REFERENCE STATION 1 USER RECEIVER 1 INTERNET REFERENCE STATION 2 INTERNET REPLICATOR DGPS/RTK SERVER TERMINAL GPRS N - UP TO 65K USERS N-USER RECEIVER N-REFERENCE STATION» Fixed IP user number
Utilization of the GSM/GPRS system Monitoring of rally cars 62 Rally of Poland 2005 B. Oszczak GPS antenna
Utilization of the GSM/GPRS system Monitoring of rally cars 62 Rally of Poland 2005 B. Oszczak GPS antenna
Utilization of the GSM/GPRS system System of recording road accidents with DGPS/GPRS technique S. Oszczak, T. Templin REFERENCE STATION GPS SATELLITE SIGNAL DGPS/RTK CORRECTIONS
Utilization of the GSM/GPRS system IACS (Integrated Administration Control System) subsidies for farmers
Utilization of the GSM/GPRS system Navigation for bathymetric survey D. Popielarczyk
Utilization of the GSM/GPRS system DTM creation of Sniardwy Lake D. Popielarczyk
Static tests of RTK/GSM/GPRS teletransmission the system
Static tests of RTK/GSM/GPRS teletransmission the system
Dynamic DTM creation Design of the profiles
Dynamic DTM creation Measurement of the profiles
Dynamic DTM creation Vehicle taking part in the measurements
Dynamic DTM creation Equipment taking part in the measurements
Dynamic DTM creation Real time navigation along measurement profiles
Dynamic DTM creation Designed profiles and actual track of the vehicle
Dynamic DTM creation Measurement of the profiles
Statistical analyses of various GPS techniques 2.0 Reference positioning accuracy 1.5 [m] 1.0 dx dy dh 0.5 0.0 11:10:01 11:28:21 11:45:18 12:02:22 12:21:08 12:38:34 time
Statistical analyses of various GPS techniques 0.06 Reference positioning accuracy 0.05 [m] 0.04 0.03 0.02 dx dy dh 0.01 0.00 11:10:01 11:21:18 11:31:01 11:40:58 11:50:38 time
Statistical analyses of various GPS techniques 4 RTK positioning accuracy 3 [m] 2 1 0 dx dy dh -1-2 11:10:01 11:20:58 11:30:21 11:40:10 11:49:30 time
Statistical analyses of various GPS techniques 0.20 RTK positioning accuracy [m] 0.15 0.10 0.05 0.00-0.05-0.10-0.15-0.20 11:10:01 11:20:58 11:30:21 11:40:10 11:49:30 time dx dy dh
Statistical analyses of various GPS techniques 10 EGNOS positioning accuracy 5 [m] 0-5 dx dy dh -10-15 13:11:00 13:22:57 13:35:06 13:49:51 time
Statistical analyses of various GPS techniques 4 DGPS positioning accuracy 2 [m] 0 dx dy dh -2-4 13:11:00 13:22:57 13:35:06 13:49:51 time
Generation of DTM
Generation of DTM 178 177 176 175 174 173 172 171 170 169 168 167 166 165 0 100 200 300 400 Lake _ 3 Lake _ 3 REF_1 Lake _ 2 0 100 200 300 400
Conclusions Possibility of receiving of DGPS/RTK data by n-users from freely chosen reference station. Corrections can be received at any place of Polish territory with the GSM coverage. Distribution of corrections is possible using freely chosen any GSM operator in Poland. The system is open to any further updates, improvements and modifications.
Conclusions The cost of using GSM/GPRS system is quite reasonable: 1 hour of DGPS corrections receiving (with 2 sec. interval) is around 0.06 1 hour of RTK corrections receiving (with 2 sec. interval) is around 0.30
Conclusions Very efficient and cost-effective generation of DTM (5 ha = 90 min) with centimeter level of accuracy. Using ATV allows driving in any kind of terrain quickly and effectively. The whole process concerning preparation phase and actual measurement phase can be done by just one person.
Thank you for your attention www.kgsin.pl e-mail: adam.ciecko@uwm.edu.pl