NEO-M9N - Integration manual
Config key
Description
OPERATEMODE
Receiver mode of operation
POSUPDATEPERIOD
Time between two position fix attempts in on/off power save mode
ACQPERIOD
Time between two acquisition attempts if the receiver is unable to get a position fix
MINACQTIME
Minimum time the receiver spends in
Acquisition
state
ONTIME
Time the receiver remains in
Tracking
state and produces position fixes
WAITTIMEFIX
Wait for time fix before entering
Tracking
state
DONOTENTEROFF
Receiver does not enter
(Inactive) awaiting next search
state if it cannot get a position fix
but keeps indefinitely attempting a position fix instead
UPDATEEPH
Enables periodic ephemeris update
EXTINTSEL
Selects EXTINT pin used with pin control feature
EXTINTWAKE
Enables force-ON pin control feature
EXTINTBACKUP
Enables force-OFF pin control feature
EXTINTINACTIVE
Enables sleep on inactivity feature
EXTINTINACTIVITY
Specifies allowed inactivity period
GRIDOFFSET
Time offset of update grid with respect to start of week
MAXACQTIME
Maximum time in
Acquisition
state
Table 20: Power save mode configuration options in the CFG-PM group
3.11.2.2.1 Mode of operation (OPERATEMODE)
The mode of operation to use mainly depends on the update period: For short update periods (in the
range of a few seconds), cyclic tracking should be configured. For long update periods (in the range
of minutes or longer), only use on/off operation.
See section
On/off operation - long update period
Cyclic tracking operation - short update period
for more information on the two modes of operation.
3.11.2.2.2 Reference time standard
Where multiple GNSS can operate simultaneously, UTC time standard is used for the operation of
PSM.
3.11.2.2.3 Update period (POSUPDATEPERIOD) and search period (ACQPERIOD)
The update period specifies the time between successive position fixes. If no position fix can be
obtained within the acquisition timeout, the receiver will retry after the time specified by the search
period. Update and search periods are fixed with respect to an absolute time grid based on reference
time standard (i.e., GPS Time or UTC, see
). They do not refer to the time
of the last valid position fix or last position fix attempt.
The update period (POSUPDATEPERIOD) setting is ignored if the receiver is set into cyclic
tracking mode. It only has an impact if the receiver is set to on/off mode.
New settings are ignored if the update period or the search period exceeds the maximum
number of milliseconds in a week. In that case the previously stored values remain effective.
3.11.2.2.4 Minimum acquisition time (MINACQTIME)
The receiver tries to obtain a position fix for at least the time given in
MINACQTIME
. If the receiver
determines that it needs more time for the given starting conditions then it will automatically
prolong this time. If MINACQTIME is set to zero then the minimum acquisition time is exclusively
determined by the receiver. Once the MINACQTIME has expired, the receiver will terminate the
acquisition state if either a fix is achieved or if the receiver estimates that any signals received are
insufficient (too weak or too few) for a fix to be possible.
UBX-19014286 - R07
3 Receiver functionality
Page 47 of 95
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