ashtech HDS800, Reference Manual

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Set Command Library
SOM: Masking Signal Observations
Function
The SOM command is used to apply masks on the following
data:
• Cumulative tracking time (CTT), in seconds
• Navigation data (NAV)
• Signal-to-Noise Ratio (SNR), in dBHz
• Channel warnings (WRN)
As a result of the presence of these masks, only the signal
observations meeting the required level of quality will be
made available by the receiver through the relevant output
messages.
Command Format
Syntax
$PASHS,SOM,d[*cc]
Parameters
Comments
“Masking” signal observations therefore means definitively
rejecting those observations not meeting the level of quality
requested by the different masks set through the SOM
command.
”SOM” stands for “Signal Observations Masks”.
Example
Setting masks for a reference station:
$PASHS,SOM,1*39
Parameter Description Range Default
d Observation mask index See table below. 4
*cc Optional checksum *00-*FF
Observation mask Index
d Description
0 No masking
1 Reference station
2 Static base
3 Moving base
4 Rover (default)
9 User-defined