Lantronix PNT Series PNT-SG3FS GNSS Module Software User Guide - Page 55

Periodic Mode

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10. Low Power Modes State LOW_POWER EPHEMERIS_ REFRESH Description Next State o Only one GNSS constellation is enabled FULL_CONST only if EHPE average is available (Adaptive constellation greater than EHPE threshold (bad sky ON/OFF) condition) o Only the first N GPS/GLONASS satellites (with higher elevation) are used for the position calculation (Adaptive tracked satellites) EPHEMERIS_REFRESH only if the ephemeris-refresh timeout fires (30 o Duty cycle for every channels enabled minutes timeout) and Base-Band enabled (if configured) o Turn-on the ephemeris-refresh timer o Turn on all constellation to download the LOW_POWER_STATE only when the updated ephemeris-data ephemeris are downloaded The Adaptive low power management can operate even in the case in which the constellation enabled is GPS only and GLONASS only. In this case, the low power state only consists in reducing the GPS/GLONASS used satellites. Table 16. Adaptive Low Power Mode Low power mode 1 Dynamic Constellation ON/OFF 2 Dynamic Constellation ON/OFF (standard mode) 3 Only Duty Cycle mode 4 Duty Cycle mode with reduced satellites (better elevation) Features Constellation switch (GPS only enabled) based on estimated EHPE / Duty Cycle enable / ephemeris refresh / ability to reduce the tracked satellites (better elevation) / ability to disable the duty cycle based on estimated EHPE Constellation switch (GPS only enabled) based on estimated EHPE / ephemeris refresh / ability to reduce the tracked satellites (better elevation) Duty Cycle enable / ephemeris refresh / ability to disable the duty cycle based on estimated EHPE Duty Cycle enable / ephemeris refresh / ability to disable the duty cycle based on estimated EHPE / ability to reduce the tracked satellites Periodic Mode The periodic mode has different settings to control the FIX reporting, and other settings to control the low power hardware state. The periodic mode can have two different hardware states between FIX activities: ♦ Wait For Interrupt state used in Active Periodic mode, where the system clock is set to the RING oscillator (a low-power oscillator) ♦ Standby state used in Standby Periodic mode, where only Always ON domain is alive Although the Wait For Interrupt hardware state ensure continuity of software execution and maintain data, the Standby hardware state is a reset and ARM Core state and on-board memories except backup RAM are lost. PNT-SG3FS GNSS Module Software User Guide 55

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10. Low Power Modes
PNT-SG3FS GNSS Module Software User Guide
55
State
Description
Next State
LOW_POWER
o
Only one GNSS constellation is enabled
available (Adaptive constellation
ON/OFF)
o
Only the first N GPS/GLONASS
satellites (with higher elevation) are used
for the position calculation (Adaptive
tracked satellites)
o
Duty cycle for every channels enabled
and Base-Band enabled (if configured)
o
Turn-on the ephemeris-refresh timer
FULL_CONST only if EHPE average is
greater than EHPE threshold (bad sky
condition)
EPHEMERIS_REFRESH only if the
ephemeris-refresh timeout fires (30
minutes timeout)
EPHEMERIS_
REFRESH
o
Turn on all constellation to download the
updated ephemeris-data
LOW_POWER_STATE only when the
ephemeris are downloaded
The Adaptive low power management can operate even in the case in which the constellation
enabled is GPS only and GLONASS only. In this case, the low power state only consists in
reducing the GPS/GLONASS used satellites.
Table 16. Adaptive Low Power Mode
Low power mode
Features
1
Dynamic Constellation
ON/OFF
Constellation switch (GPS only enabled) based on estimated EHPE / Duty
Cycle enable / ephemeris refresh / ability to reduce the tracked satellites
(better elevation) / ability to disable the duty cycle based on estimated
EHPE
2
Dynamic Constellation
ON/OFF
(standard mode)
Constellation switch (GPS only enabled) based on estimated EHPE /
ephemeris refresh / ability to reduce the tracked satellites (better elevation)
3
Only Duty Cycle mode
Duty Cycle enable / ephemeris refresh / ability to disable the duty cycle
based on estimated EHPE
4
Duty Cycle mode with
reduced satellites (better
elevation)
Duty Cycle enable / ephemeris refresh / ability to disable the duty cycle
based on estimated EHPE / ability to reduce the tracked satellites
Periodic Mode
The periodic mode has different settings to control the FIX reporting, and other settings to control
the low power hardware state.
The periodic mode can have two different hardware states between FIX activities:
♦
Wait For Interrupt state used in Active Periodic mode, where the system clock is set to
the RING oscillator (a low-power oscillator)
♦
Standby state used in Standby Periodic mode, where only Always ON domain is alive
Although the Wait For Interrupt hardware state ensure continuity of software execution and
maintain data, the Standby hardware state is a reset and ARM Core state and on-board memories
except backup RAM are lost.