[teqc] GLONAS SV ID 255 filter?

Isaac Hoyas Ester isaac.hoyas.ester at rokubun.cat
Thu Jan 11 09:04:26 MST 2018


 

Hello, 

I have been trying to find instructions on how to use TEQC to filter out
GLONASS observations with slot ID 255, this may happen because the Ublox
receiver that I'm trying to convert raw data from may be able to decode
data from a GLONASS SV before it can identify the SV. When this occurs
UBX-RXM-SFRBX messages will be issued with an svId of 255 to indicate
"unknown". 

Here you have a RINEX observation epoch example showing a GLONASS SV
with slot ID 255: 

17 12 22 22 9 6.9940000 0 17G24G29G25G31G12G32R08R09G04G02R255R10
 R19R20G14R18R16
 117546916.037 6 22368465.110 40.000 -3572.229
 96793892.692 8 18419251.051 49.000 865.332
 98761291.535 8 18793667.599 48.000 -530.120
 108401382.976 7 20628091.097 44.000 2600.400
 106915274.094 7 20345288.104 46.000 -2394.498
 110635793.326 6 21053314.460 40.000 -2140.314
 117523692.247 5 21946725.423 34.000 -1896.710
 94773244.591 7 17748010.382 46.000 1014.036
 114537730.343 5 21795793.846 34.000 2758.222
 113756995.669 7 21647232.534 42.000 -1099.824
 108373678.553 7 20316337.163 43.000 4082.983
 111241066.317 6 20868543.848 36.000 3423.625
 93974283.751 7 17567507.189 45.000 580.784
 108749564.993 6 20336700.814 37.000 4121.685
 108824714.448 6 20708650.009 40.000 -573.414
 104444377.513 6 19565957.947 40.000 -3400.356
 102423064.459 6 19173840.114 40.000 -2393.646 

Many thanks for your support. 

Best Regards 

Isaac 
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