GLOBALSAT ET-314 GPS Engine Board - Manual (Page 15)

ET-314AC
High Performance GPS Engine Board
2010/4/1
- 15 -
B). Navigation lnitialization ID：101 Parameters required for start
This command is used to cause a restart of the receiver, and to specify the type of restart.
Optionally, it may also initialize position (in X, Y, Z ECEF coordinates), clock drift, GPS Time Of
Week and GPS Week Number. This enables the receiver to search for the correct satellite signals
at the correct signal parameters. Correct initialization parameters enable the receiver to quickly
acquire signals.
For software that does not support initializing data (GSW3, GSWLT3, SiRFXTrac), attempting to
include initializing data may cause unpredictable results. Do not set the initialize-data bit in the
ResetCfg word.
Table B-2 contains the input values for the following example:
Start using known position and time.
$PSRF101,-2686700,-4304200,3851624,96000,497260,921,12,3*1C
Name Example Units Description
Message ID PSRF101 PSRF101 protocol header
ECEF X -2686700 Meters X coordinate position
ECEF Y -4304200 Meters Y coordinate position
ECEF Z 3851624 Meters Z coordinate position
clkDrift 96000 Hz Clock offset of the receiver in Hz☆
TimeOfWeek 497260 Sec GPS Time Of Week
WeekNo 921 GPS Week Number
（
Week No and Time Of Week calculation from
UTC time）
ChannelCount 12 Number of channels to use.1-12. If your CPU
throughput is not high enough, you could decrease
needed throughput by reducing the number of active
channels
ResetCfg 3 See Table B-3 & B-4
Checksum *1C
End of message termination
☆ Use 0 for last saved value if available. If this is unavailable, a default value of 75000 for GSP1,
95000 for GSP 1/LX will be used.