USGlobalsat EM-318-02 - Manual (Page 13)

EM-318-02
Specifications are subject to be changed without notice.
Page 13 of 16
Version 1.2.1
$PSRF100,4,38400,8,1,0*38
**Checksum Field: The absolute value calculated by exclusive-OR the 8 data bits of each character
in the Sentence, between, but, excluding “$” and “*”. The hexadecimal value of the most significant
and least significant 4 bits of the result are converted to two ASCII characters (0-9,A-F) for
transmission. First, the most significant character is transmitted.
** : Hex 0D 0A
B.) Navigation initialization ID:101 Parameters required for start
This command is used to initialize the GPS module for a “Warm” start, by providing real-time position
（
in X, Y, Z coordinates), clock offset, and time. This action enables the GPS receiver to search for the
necessary satellite signals at the correct signal parameters. The newly acquired and stored satellite
data will enable the receiver to acquire signals more quickly, and thus, generate a rapid navigational
solution.
When a valid Navigation Initialization command is receive, the receiver will restart using the input
parameters as a basis for satellite selection and acquisition.
Format
$PSRF101,,,,,,,,
*CKSUM
X coordinate position
INT32
Y coordinate position
INT32
Z coordinate position
INT32
Clock offset of the receiver in Hz, Use 0 for last saved value if available.
If this is unavailable, a default value of 75000 for GSP1, 95000 for GSP 1/LX
is used.
INT32
GPS Time Of Week
UINT32
GPS Week Number
UINT16
Week No and Time Of Week calculation from UTC time
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
UBYTE
bit mask
0×01=Data Valid warm/hotstarts=1
0×02=clear ephemeris warm start=1
0×04=clear memory. Cold start=1
UBYTE