International collaboration on open source scientific software: latest developments in goGPS positioning engine FOSS4G 2013 Osaka 7 November 2013 Eugenio Realini RISH, Kyoto University Daisuke Yoshida GSCC, Osaka City University Hirofumi Hayashi Applied Technology Co.,Ltd Venkatesh Raghavan GSCC, Osaka City University
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International collaboration on open source scientific software: latest developments in goGPS positioning engine
FOSS4G 2013 Osaka7 November 2013
Eugenio Realini RISH, Kyoto UniversityDaisuke Yoshida GSCC, Osaka City UniversityHirofumi Hayashi Applied Technology Co.,LtdVenkatesh Raghavan GSCC, Osaka City University
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GPS “raw data”(observations, orbits, …)
If we have:- satellite positions- satellite-receiver distances- precise time
we can estimate:- receiver position/velocity- atmospheric parameters- …
and we can do research:- positioning accuracy improvement- deformation monitoring- atmospheric water vapor retrieval- …
From GPS to GNSS
GNSS Global Navigation Satellite System
GPS is not the only positioning system available
Other countries apart from US are building global (or regional) satellite systems
Russia China Europe Japan IndiaGLONASS BeiDou Galileo QZSS IRNSS
Global Regional
Standard consumer grade (low-cost) receiver: - GNSS observations are processed within the receiver - User can access only the processing result (e.g. coordinates)
GNSS observations Coordinatesand ancillary data Only visualization!
GNSS “raw data”(observations, orbits, …)
By accessing raw data, we can perform advanced analyses, e.g. - improving the positioning accuracy by relative positioning
- study and monitor the atmosphere - …
Rawdata
GNSS “raw data”(observations, orbits, …)
Receivers providing “raw data”GNSS receivers generally provide raw data formatted according to proprietary binary protocols.
Often these protocols are available to customers (or even public).
Almost all geodetic(survey grade) receivers
(dual-frequency orsingle-frequency)
A few low-cost(consumer grade) receivers
(single-frequency)
~ $3,000 – $30,000
~ $100 – $500
Low-cost raw data logger prototypeLow-cost raw data logger prototypeENVLoggerRPi
- developed at Osaka City University- u-blox LEA-6T module (GPS raw data)- environmental sensors (T, P, RH, CO2)- logging data on microSD card- Raspberry Pi (credit card-sized Linux computer)- Power-over-Ethernet- Configurable (text file on SD card)- open source firmware