Parameters
- EnableLowPowerDriving="true" - Enables the power management mode in Stationary/Driving/Highway mode. More optimized for power saving.
- EnableLowPowerPmm="true" - Enables the power management mode in Stationary/Driving mode. More optimized for positioning performance.
Example configuration
<gll_features
EnableLowPowerPmm="true"
/>
Overview of PMM Mode
PMM (Power Management Mode) reduces the power consumption of the GNSS ASIC by employing one or more of the below schemes:
1) Reduces the number of acquisition and tracking channels
- Automatic, No configuration required to be set in the configuration file.
- The transition between Acquisition and Track is gradual as satellites are acquired.
- Once we track enough satellites, we only keep the tracking channels running and turn off the search engine, which is the main power burner in the baseband section.
2) Does Duty cycling of the main ASIC functions
- Requires, EnableLowPowerDriving="true"/EnableLowPowerPmm="true", to be set in the configuration file.
- Entry and exit out of low power tracking is automatic based on signal conditions (e.g. fewer visible satellites, multipath conditions,...) and user environment (e.g. change in vehicle dynamics, Urban environment, tunnels,...).
- Duty cycle mode (50%) turns off RF section, external LNA and most of the baseband section.
- PMM is exited regularly to update ephemeris and almanac data.