USGlobalsat EM-506 User Manual
Page 17
EM-506
High Performance GPS Module
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＄PSRF103,05,00,01,01*20
Example 3: Disable VTG message
＄PSRF103,05,00,00,01*21
E). LLA Navigation lnitialization ID: 104 Parameters required to start using Lat/Lon/Alt
This command is used to initialize the module for a warm start, by providing current position (in
Latitude, Longitude, Altitude coordinates), clock offset, and time. This enables the receiver to
search for the correct satellite signals at the correct signal parameters. Correct initialization
parameters will enable the receiver to acquire signals more quickly, and thus, will produce a faster
navigational soution.
When a valid LLA Navigation Initialization command is received, the receiver will restart using the
input parameters as a basis for satellite selection and acquisition.
Format:
＄PSRF104,
Latitude position, assumed positive north of equator and negative south of
equator float, possibly signed
Longitude position, it is assumed positive east of Greenwich and negative
west of Greenwich Float, possibly signed
Altitude position float, possibly signed
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 GSP1/LX
will be used.
INT32
GPS Time Of Week
UINT32
GPS Week Number
UINT16
bit mask
0×01=Data Valid warm/hot starts=1
0×02=clear ephemeris warm start=1
0×04=clear memory. Cold start=1
UBYTE
Example: Start using known position and time.
＄PSRF104,37.3875111,-121.97232,0,96000,237759,922,12,3*37
F). Development Data On/Off ID: 105 Switch Development Data Messages On/Off