[teqc] Some Glonass sats L1 only ?

Mathieu Peyréga mathieu.peyrega at gmail.com
Thu Jul 5 02:46:31 MDT 2018


Hello,

this is not really a teqc question, i'm rather hopping to take advantage 
of the large GNSS specialist audience here to try get an answer.

It seems that recentrly some receivers have had issues tracking L2 on 
some glonass sats (e.g. R12, R6)

e.g. :


http://rgp.ign.fr/STATIONS/#SMNE
http://rgp.ign.fr/STATIONS/#AXPV


use Trimble receivers and have some sats in L1 only

http://rgp.ign.fr/STATIONS/#TLSG
http://rgp.ign.fr/STATIONS/#BRST

use Septentrio and also got some sats in L1 only

http://rgp.ign.fr/STATIONS/#MLVL
http://rgp.ign.fr/STATIONS/#EGLT

use Leica and have the "issue"

Other stations use Laice :

http://rgp.ign.fr/STATIONS/#PANA

or Trimble :

http://rgp.ign.fr/STATIONS/#CLFE

and do not suffer this apparently.

I've hooked an AsterX4 card on the splitter of my station (main board is 
Trimble) and both are reporting no L2 for R12 and R6

The spectrum view from AsterX4 shows no special spikes around L2 glonass 
freq

Glonass constellation status page does not report special stuff for R12 
and R6.

Does someone have an idea what is going on ?

Best regards,

Mathieu Peyréga


-- 
tel : +33 (0)6 87 30 83 59

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