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3 INTERFACE CHARACTERISTICS
50 Copernicus GPS Receiver
A-GPS
The Copernicus GPS Receiver is equipped with assisted GPS (A-GPS), which
enables the receiver to obtain a position fix within seconds using almanac, ephemeris,
time, and position data. This position data can be uploaded to the device via TSIP
packets or the Trimble GPS Monitor (TGM) application. When A-GPS is enabled, the
Copernicus GPS Receiver can achieve fast start-up times characteristic of a hot start.
Follow the procedures below to download current almanac, ephemeris, time, and
position information, and then upload this data to the starter kit module via TGM or
TSIP (to upload position data within the customer application).
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Warning – To ensure proper format of the ephemeris file and almanac file, a Trimble receiver must
be used to gather this data. Almanac files from non-Trimble receivers may not be in proper format
and thus may not work, (i.e. almanac files downloaded from the Internet).
Enabling A-GPS with the Trimble GPS Monitor Application (TGM)
1. Attach the Copernicus GPS interface unit to your PC.
2. Place the GPS antenna where there is a clear view of sky.
3. Allow the starter kit to run and calculate fixes.
4. On the main screen, wait for the almanac indicator to turn green confirming
that the receiver has collected a current almanac.
Note – It takes 12,5 minutes of uninterrupted Copernicus operation to collect
almanac from the satellites.
5. Click on the initialized pull-down menu and use the download features on the
bottom of the pull-down to download the almanac, position, time and
ephemeris files on your PC.
6. Now that you have collected these files, you can upload them using the upload
features on the initialize pull-down window in TGM.
Note – The collected ephemeris is only good for approximately 2 hours.