Discussion:
Ublox M8T question
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Mark Sims
2018-05-24 00:17:46 UTC
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I recently got in a Ublox M8T board in from CSGSHOP. The M8T supposedly outputs raw measurements (carrier phase, pseudorange, doppler) for all the sat systems it supports, but I am only getting raw measurements for GPS and SBAS... no Glonass or Galaileo. Any ideas why? Has anybody gotten raw data for GLONASS or Galileo out of a M8T:

This is the receiver id info from the M8T:
# Device: Ublox timing receiver
# Unit type: Ublox GPS receiver
# SW: EXT CORE 3.01 (111141
# HW: 00080000
# ROM 1: ROM BASE 2.01 (75331)
# ROM 2: FWVER=TIM 1.10
# ROM 3: PROTVER=22.00
# ROM 4: MOD=NEO-M8T-0
# ROM 5: FIS=0xEF4015 (100111)
# ROM 6: GPS;GLO;GAL;BDS
# ROM 7: SBAS;IMES;QZSS
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Tim Lister
2018-05-24 01:32:27 UTC
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Mark, I think you need to look at the CFG-GNSS message to enable the
constellations that you want. RTKLIB has a
data/ubx_m8t_glo_raw_1hz.cmd command file for enabling GLONASS so this
could give some pointers. (I've not tested this since my LEA-6T only
supports GPS+SBAS)

Tim
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Mark Sims
2018-05-24 02:12:51 UTC
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I have it working now. The problem was the way I was interpreting the satellite system gnssid:svid values in the RAWX message. Basically the data for all the sat systems were being mapped to GPS prns.

Heather has a command for configuring which GNSS constellations that you want to use. Ublox devices have some limits on which constellations that you can enable at the same time.

Heather's RINEX writer now supports RINEX v2.11 and v3.03 (needs a couple of tweaks). But none of the processing services support v3.xx so no way to test it. I'm currently writing a 2.11 file with GPS/SBAS/GLONASS/GALILEO data... hopefully that will work. I've done GPS/GLONASS/SBAS files from a NVS-08C.

-----------------------

I think you need to look at the CFG-GNSS message to enable the
constellations that you want.
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