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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
30
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 NMI.
Ephemeris collection time in general this
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:
Off period = (On Period*(1-Duty Cycle) /
Duty Cycle)
Off Period is limited to 30 minutes. The
duty cycle will not be less than
approximately On Period/1800, or about
1%. Push-to-Fix keeps the ephemeris for
all visible satellites up to date so
position/velocity fixes can generally be
computed within SnapStart times (when
requested by the user) on the order of 3
seconds.
Poll Navigation Parameters -
Message I.D. 152
Table C-20 contains the input values for
the following example:
Example: Poll receiver for current
navigation parameters.
A0A20002—Start Sequence and Payload
Length
9800—Payload
0098B0B3—Message Checksum and End
Sequence
Table C-20 Poll Receiver for Navigation Parameters
Binary(Hex)
Name
Bytes
Scale Example
Units
Description
Message ID 1 98 ASCII 152
Reserved 1 00
Payload length: 2 bytes
Set UART Configuration - Message
I.D. 165
Table B-28 contains the input values for the
following example:
Example: Set port 0 to NMEA with 9600 baud,
8 data bits, 1 stop bit, no parity. Set
port 1 to SiRF binary with 57600 baud, 8
data bits, 1 stop bit, no parity. Do not
configure ports 2 and 3.
Example:
A0A20031—Start Sequence and Payload
Length
A5000101000025800801000000010000000
0E1000801000000FF050500000000000
0000000FF0505000000000000000000—Pa
yload
0452B0B3—Message Checksum and End
Sequence