Changing update rate on GPS

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  • #18131
    Alex Babij

    Hi, how can I change the gps update rate from 1Hz to something faster i.e. 10Hz on the SARA-R5M8? I tried sending a ubx string to ttyGSM1 and ttyGSM2 with: ‘echo -e -n “\xB5\x62\x06\x08\x06\x00\x64\x00\x01\x00\x01\x00\x7A\x12″ > /dev/ttyGSM1’ , but couldn’t get the changes to show up in the nmea output in ttyGSM3 or in gpsd. I tried changing the update rate through gpsd with ‘gpsctl -c 0.1’ (and I tried 5Hz, 2Hz as well), but that didn’t seem to change it either. Is there a correct way to send ublox strings to the gps? I would prefer to do it through ubxtool, but gpsd is pointed to ttyGSM3 which isn’t a control channel. Not sure if its possible to point gpsd to multiple channels maybe? I tried pointing ubxtools to a channel where it can send commands, but that didn’t seem to work, maybe I need to somehow make it send with an AT command (AT+UGUBX=””), but Im still not sure how to change the setting on the gpsd end. Maybe there’s some way to make ubxtools add AT+UGUBX=” to the string it sends?

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