Normal Mode; Low Power Tracking - Sierra Wireless AirPrime XS1110 Command Reference Manual

AirPrime XS1110 AT Command Reference
Rev 3.1 Jul.20

Normal Mode

In Normal mode, the XS1110 module keeps on operating normally and updates the
latest navigation message anytime to get an accurate positional information.
Figure 2-1: Power Consumption in Normal Mode

Low Power Tracking

Figure 2-2: Power Consumption in Low Power Tracking
When low power tracking of XS1110 is enabled, in the beginning, it keeps receiving a
GNSS navigation message. This GNSS navigation message is continually received
for about 12 minutes and 30 seconds and includes the ephemeris, almanac, and
satellite health in open sky.
After that, the module runs to cycle between Sleep (15 secs) and Exec (30 secs) as
shown in Figure 2-2.
Before the XS1110 module enters into a sleep state, it outputs
"GNSSLOWP,ENTRY,OK" messages in NMEA sentences to indicate that sleep mode
will be executed. Once the XS1110 wakes up, it outputs "GNSSLOWP, WAKEUP,
OK" to indicate that the module has woken up and will start updating the navigation
message.
The module executes hot start internally after waking up every time, then it acquires
satellite information for about 30 seconds to update the TOW (time of the week).The
module will check all of the satellite ephemeris status and ensure that all updated
data is the latest. Once update is complete, the modules enters into the sleep cycle. If
it doesn't, it will keep acquiring satellites in an exec status until all the navigation
messages are completely updated as this is helpful for ensuring positional accuracy.
The module will hot start after waking up from an intermittent behavior and, within 30
seconds, track satellites to update the TOW (time of the week). Then the module will
check all of the satellite ephemeris to ensure data update is complete. If there are no
issues, the module gets into the next sleep cycle. Otherwise, the module will switch
into continuous operation and keep tracking until data update is complete.
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