GNSS Data Integrity Monitor System (GDIMS)

Hanssen, R. I., Halvorsen, T., Vang, P.

Norwegian Mapping Authority, Honefoss, Norway


The GDIMS is a GNSS Data Integrity Monitor System is an equipment for data
collection, quality control and monitoring of GNSS data from multiple GNSS
receivers. It is a based upon Hewlett Packard's A-Class Enterprise Server
which is a High-performance, PA-RISC/UNIX server in the low-price range
and mounted in a standard 19" rack

The GDIMS software  is based on an Open Interface Architecture which
makes it easy to integrate other (self developed) software and  is
controlled via a WEB-interface.

The GDIMS is able to download data from several GNSS receivers of
different types and can be used as a stand-alone unit using FTP for
data download  and/or used in real-time applications, communicating
with data centres using TCP/IP sockets.

The GDIMS is using SATREF Receiver Independent Binary Exchange
Format, SATREF RIBEX,  which makes it easy to use the data in different
applications (or logical networks) combining data from different receivers.
In addition, the GDIMS is able to store data locally in receiver specific
format.

The SATREF RIBEX Format is a message based format used in NMA since
1992. It contains one complete time-sample per message. GPS-, GLONASS-
and GEO-data are defined through different message classes.

The last version contains information that connects each message (or sample)
to the current site log, making it easier to handle changes and carry out
quality assurance of old data. An earlier version of the format is also
being used in the EGNOS Test Bed.