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L-Band Positioning
4.1.2
Chapter 4
Canada/America-Wide CDGPS
The CDGPS service utilizes the MSAT-1 and MSAT-2 communications satellites.
In order to enable CDGPS positioning, you must enable L-band tracking to the CDGPS signal. The
CDGPS signal is broadcast on 4 different spot beams on the MSAT-1 satellite. Depending on your
geographic location, there will be a different frequency for the CDGPS signal as shown in Figure 6.
Figure 6: CDGPS Frequency Beams
The following are the spot beam names and their frequencies:
East
East-Central
West-Central
West
1,547,646 Hz
1,557,897 Hz
1,557,571 Hz
1,547,547 Hz
The data signal is structured to perform well in difficult, or foliated conditions, so the service is
available more consistently and has a high degree of service reliability.
CDGPS features wide area technology, possible spatial integrity with all Government of Canada maps
and surveys 1, 24-hour/7 days-a-week built-in network redundancies and an openly published
broadcast protocol.
Figure 7, CDGPS Percentage Coverage Map on Page 16 is a conservative map of the coverage areas
that CDGPS guarantee. The coverage may be better in your area.
1.
If the coordinates are output using the CSRS datum. Refer to the DATUM command in
Volume 2 of the OEM4 Manual set.
GPS+ Reference Manual
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