FALCOM JP7-T Series Hardware Description page 18

GPS-RECEIVER JP7-T VERSION 1.02
Push-To-Fix
In this mode the receiver will turn on every 30 minutes to perform a system
update consisting of a RTC calibration and satellite ephemeris data
collection if required (i.e., a new satellite has become visible) as well as all
software tasks to support SnapStart in the event of an NMEA. Ephemeris
collection time in general takes 18 to 30 seconds If ephemeris data is not
required then the system will re-calibrate and shut down. In either case, the
amount of time the receiver remains off will be in proportion to how long it
stayed on:
On Period * (1-Duty Cycle)
Off period = ---------------------------------------------
Duty Cycle
The off period has a possible range between 10 and 7200 seconds. The
default is 1800 seconds.
Comparison
A comparison of the Trickle Power and Push-to-Fix modes is shown in
Figure below. This diagram shows that for position update intervals less
than approximately 600 seconds (i.e. rates faster than one fix per 10
minutes), the Trickle Power mode at an update interval of 10 seconds offers
a lower power solution. The user would then be required to filter the output
position data to use only the data points corresponding to the desired update
interval. For example, if the desired position output is at 60 second intervals,
then the user would only need one out of every six position outputs at a 10
second Trickle Power update interval. Alternatively, the user could perform
smoothing or averaging of the position data and provide an output at the
desired rate.
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