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Acutime 2000 Synchronization Kit User Guide A-37
A Trimble Standard Interface Protocol
0x39 Command Packet 39
Satellite Attribute Database Command
Normally the GPS receiver selects only healthy satellites (based on
transmitted values in the ephemeris and almanac) that satisfy all mask
values for use in the position solution. This packet allows you to
override the internal logic and force the receiver to either
unconditionally disable a particular satellite or to ignore a bad health
flag. The GPS receiver returns packet 59 for operation modes 3 and 6
only.
At power-on and after a reset the default values are set for all
satellites.
"
Caution – Ignoring health can cause the GPS receiver software to
fail, as an unhealthy satellite may contain defective data. Use
extreme caution in ignoring satellite health.
Table A-24 Command Packet 39
Byte Item Type Value Meaning
0 Operation Byte 1
2
3
4
5
6
Enable for selection (default)
Disable for selection
Request enable or disable
status of all 32 satellites
Heed health on satellite (default)
Ignore health on satellite
Request heed or ignore health on
all 32 satellites
1 Satellite # Byte 0
1-32
All 32 satellites
Any one satellite PRN number