Xtra Positioning - Huawei MU609 Application Manual

HUAWEI MU609 HSPA LGA Module
Application Guide
Note:

12.4 XTRA Positioning

Command
AT^WPDOM=6
OK
AT^XTRASTA
OK
^XDSTATUS: 0,0,0,0
AT^XTRATIME......
OK
^TIMESETRULT: 0
AT^XTRADATA......
Issue 02 (2013-09-18)
The MSB method requires the module to register with a network, and will incur data traffic
during positioning. When the MSB positioning fails, the module will automatically switch to the
Standalone positioning if NV3756 = 1, but will not switch to the Standalone positioning if
NV3756 = 0.
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Description
Set the positioning method to gpsOneXTRA.
Query the status of XTRA data. If the date of the
obtained XTRA data is more than seven days
earlier than the current date, the XTRA data is
invalid, and the module needs to download new
XTRA data. (The XTRA data's ability to assist
positioning declines as time goes by. Therefore, it
would be appropriate to set the XTRA data's valid
period to three days. You can also download the
latest XTRA data without querying the existing
XTRA data information.)
Notify XTRA Data Query Result
Upper layer applications use this command to
access the SNTP server to obtain the current time
information, and injects the information into the
module.
Notify XTRA Time Injected Result
Upper layer applications use this command to
access the XTRA server to download XTRA data,
packetize the data, and inject the data into the
module. (You can also inject the XTRA data from
the host into the module.)
There are two types of XTRA files stored on the
XTRA server:
xtra.bin file: contains predicted two-line orbital

elements for GPS satellites, about 45 KB.
Xtra2.bin file: contains predicted two-line orbital

elements for GPS and GLONASS satellites,
about 80 KB.
GPS Application Scenarios
97