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Gemini G3 - User Manual
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Appendix 2 - "GPS Data Collection" Instructions
The extract in this appendix is taken from Technical Instruction Sheet 043 (TIS043), dated May 03, 2006.
Overview
The instructions in TIS043 are intended for application programmers and provide details on how to col-
lect GPS data in VIS networks using GPS-equipped GeminiG3 radiomodems and Paragon3 base stations.
Data Flow
GPS “strings” are collected from the embedded GPS receiver in the GeminiG3 mobile radiomodems. The
strings are converted into DCF 2.0 (“Dataradio Compressed Format, version 2.0”) reports and provided to
both local delivery and remote delivery services. The remote delivery service of the GeminiG3 sends re-
ports Out of Band (OOB) in any unused portion of control & data packets, where they are passed to the
Paragon3 local delivery service.
For diagnostic purposes, GPS data can be displayed on both the GeminiG3 and Paragon3 web pages:
•
Using a browser, basic information can be read on the GeminiG3 “GPS Status” web page.
•
Using a browser, data from the last GPS report received from each mobile can be read on the
Paragon3 “Remote Table” web page.
GPS data is also available to external applications via TCP or UDP.
Application Programmers
For further information, please contact Dataradio system engineering.