SE873 Family Product User Guide
Product Features
1VV0301216
Rev.4
Page 23 of 69
2018-08-24
4.14.2.1.
SmartGNSS I
SmartGNSS I autonomously manages GNSS system usage to save power based on signal
conditions.
The adaptive mechanism uses fewer system resources during strong signal conditions and uses
more resources during weak signal conditions in order to maintain navigation performance. Full
constellation tracking is maintained while in this mode. 1PPS is available.
4.14.2.2.
SmartGNSS II
SmartGNSS II includes the benefits of SmartGNSS I and achieves further power reduction by
minimizing the usage of the secondary GNSS constellation. The adaptive mechanism adjusts
constellation usage based on signal conditions to maintain performance while minimizing power
consumption. 1PPS is available.
Trickle Power
This mode cycles between FULL POWER and STANDBY states. It provides GPS-only navigation
updates at a fixed rate of 1 to 10 seconds, and retains good accuracy and dynamic motion
response, but at a lower average power consumption than Full Power. The receiver will go to
FULL POWER if signals are weak or the fix is lost. 1PPS is not available. TricklePower mode
yields significant power savings in strong signal conditions.
Push-to-Fix
This mode cycles between FULL POWER and HIBERNATE states. It provides for even lower
power consumption than TricklePower and is intended for applications that require relatively
infrequent position reports. The position is reported periodically (once every 6, 12, 18, 24 seconds
or 30 to 86400 seconds in 30 s increments) and also when requested by toggling the On-Off pin.
Push-to-FixII allows vehicle velocity to be taken into account for PTF period, and QoS checks to
be enabled or disabled.
SiRFaware
This mode switches between FULL POWER and HIBERNATE states. It is a power-saving mode
that maintains GPS data by waking up at intervals (e.g. every 30 minutes) to collect signals. Time
and position estimates are updated (e.g. every 10 minutes). Extended Ephemeris will be used if
available.
Hibernate
The receiver can be commanded into the HIBERNATE state, which is the lowest power mode
available. Only the RTC and BBRAM domains are powered up. Use the NMEA
$PSRF117,16
or
OSP
MID 205
command to transition to this state. The module will also transition to HIBERNATE
when the ON-OFF pin is brought low.
Summary of Contents for SE873 Series
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