Since many receivers can use appropriate software to enable users to
present information such as longitude and latitude, it is necessary to conduct
automatic measurement in a more standardized way. Fortunately, there are many
receivers that can send signals to the PXI controller through the well-known
NMEA-183 protocol. In this way, the receiver will be able to continuously
transmit relevant instructions through the serial or USB connection line. In NI
LabVIEW, all instructions can convert syntax to return satellite and positioning
information. The NMEA-183 protocol can support six basic instructions, and each
represents its own proprietary information
In terms of actual test needs, GGA, GSA, and GSV instructions should be the
most practical. It is worth mentioning that the information of GSA instruction
can be used to know whether the receiver can meet the requirements of
positioning operation, or can be used to measure the time to first fix (TTFF).
When carrying out highly sensitive measurements, we can actually use the GSV
command to return the C/N (Carrier to noise) ratio for the tracked
satellite.
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