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Acutime 2000 Synchronization Kit User Guide A-81
A Trimble Standard Interface Protocol
PDOP Mask and Switch
The PDOP mask is the maximum PDOP limit for which any 2-D or
3-D position solution will be made. The PDOP switch is the level at
which the receiver stops attempting a 3-D solution, and tries for a 2-D
solution when in automatic 2-D, 3-D mode. The switch level has no
effect on either manual mode. Raising the PDOP mask generally
increases the fix density during obscuration, but the fixes with the
higher PDOP are less accurate (especially with Selective Availability
present). Lowering the mask improves the average accuracy at the
risk of lowering the fix density.
!
Note – The receiver may require an initial position fix before switching
to some modes.
Table A-69 Command Packet BB
Byte # Item Type Value Meaning Default
0 Subcode BYTE 0 Primary receiver
configuration block
1 Operating
Dimension
BYTE 0
1
3
4
5
6
7
Automatic
Time only (1-SV)
Horizontal (2D)
Full position (3D)
DGPS reference
2D clock hold
Overdetermined
clock
Full Position
2DGPS ModeBYTE0
1
3
DGPS off
DGPS only
DGPS auto
DGPS Auto
3 Dynamics
Code
BYTE 1
2
3
4
Land, <120 knots
Sea, <50 knots
Air, <800 knots
Static
Land