Spectra Precision ProMark 800 Reference Manual - Manual (Page 254)

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Set Command Library
SOM,CTT: Cumulative Tracking Time Mask
Function This command is used to mask the signal observations that
do not meet the minimum continuous tracking time you
specify. This means that only the observations meeting this
requirement will be output (all the others will be rejected).
This mask is enabled only after the “User-defined” option (9)
has been selected with the $PASHS,SOM command.
Command Format Syntax
$PASHS,SOM,CTT,d1[,d2][*cc]
Parameters
Comments
• “Continuous” tracking means tracking “without cycle
slips”.
• This command can only mask some particular signal data.
If however at the same time the L1CA data are disabled,
then ALL the satellite observations, and not only the
masked ones, will be rejected.
• This command equally affects all GNSS and their signals.
Examples
Setting CTT masks for differential and raw data to 20 s:
$PASHS,SOM,CTT,20*65
Enabling all signal observations to be output regardless of the
continuous tracking time requirement (no CTT mask):
$PASHS,SOM,CTT,0*57
Parameter Description Range Default
d1
Minimum continuous tracking time for differen-
tial data, in seconds. “0” means no mask.
0-255 10
d2
Minimum continuous tracking time for raw data,
in seconds. If d2 is omitted, then the receiver
will assume d2=d1. “0” means no mask.
0-255 10
*cc Optional checksum *00-*FF
Raw Data Masked by d2 Differential Data Masked by d1
MPC
DPC
ATM,MESATM,RNX,SCN,0
All other messages