NMEA utilities

Python-based NMEA (ascii) reader, and a SCPI reader for Jackson Labs GPS

• nmealog.py: multithreaded NMEA serial port reader with selectable polling cadence.
• SCPIlogger.py: for Jackson Labs GPS receivers that use SCPI. It's not a raw NMEA output, but query based. |

Installation

pip install -e .

Examples

For a Garmin GPS or other GPS with NMEA output:

python nmealog.py -l out.txt -p /dev/ttyUSB0 -T 1

For a Jackson Labs SCPI-based GPS:

python SCPIlogger.py -l out.txt -p /dev/ttyUSB0 -T 1

Jackson Labs GPS SCPI commands

Here are but a few of the powerful SCPI commands you can send to a Jackson Labs GPS receiver. Note the default baudrate is 115200, NO hardware / software flow control, 8-N-1.

SCPI	result
\*IDN?	identify receiver (model #, firmware revision
GPS:SAT:VIS:COUN?	How many GPS satellites are visible per the almanac, above the 0 degree horizon
GPS:SAT:TRA:COUN?	How many GPS satellites are actually being received
SYNC:HOLD:DUR?	Holdover duration
GPS:JAM?	Estimated jamming level
PTIME:TINT?	Time offset

Reference

Another project to consider: pynmea2