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6 months for WAAS scenarios. Moreover, the start time shall not be too close to the cur-
rent time. For EGNOS, there can be a one day delay before the SBAS messages are pub-
lished on the FTP site. For WAAS the delay can possibly be longer (up to 3 or 4 days).
The Internet connection is not always needed. All downloaded ephemeris data and SBAS
data will be locally stored on the unit once they are downloaded. So, the next time the
same scenario runs, the ephemeris data and SBAS messages are read from the local stor-
age and no Internet connection is needed. The unit performs automatic clean-up of down-
loaded files. Such clean-up will occur when free disc space is less than 20% of the total disc
space.
Note: Currently SBAS corrections are not ‘applied backwards’ to the out-
putted GPS signals, even though the corrections will be transmitted in the
SBAS signal.
4.9.14 Record and Playback
Note: This is an optional feature for which the Record and Playback option
(OPT-RP) is required.
The Record and Playback software converts recorded NMEA messages into scenario, tra-
jectory, and event files. You can then upload these files to your GSG unit where they can
be played back in order to recreate the original scenario.
4.9.14.1 Standard Workflow
1.
While traveling in a car along the planned test route, record NMEA data by using a
GNSS receiver and antenna (included in the OPT-RP kit), connected to a laptop
computer with StudioView installed on it. StudioView will record the data generated.
4.9 Studioview Tasks
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