[IGS-DCWG-197] Re: exclude SVTL from merging navigation files

[Markus Bradke]

Hi Nacho and colleagues,

Some points from my side:

1. Blaming single station providers for distributing corrupt data is not 
a step we should take. Everyone relies on the manufacturers and their 
software. Therefore we should find a way to check such files before 
splicing them. There are already solutions out there, e.g. gfzrnx. 
Manually removing stations (for whatever period) is not sustainable if 
you manage more than 400 stations. Those files should have never been 
put on the FTP or not considered for merging.

2. There are more stations in the network, that produce corrupt 
navigation files for Galileo. This affects all Javad's with JPS2RIN 
before version 2.0.168. So we should advice those operators to update 
their JPS2RIN version.

All the best,

Markus




Am 10/04/2019 um 11:43 schrieb Nacho Romero:
>
> Dear Data Centers,
>
> From some hour ago station SVTL is corrupting the merged navigation 
> files across the IGS due to lingering rollover effects, this affectes 
> several automatic systems around the world. The station SVTL is 
> producing very incorrect navigation files with the catastrophic effect 
> of setting more than half of the GPS satellites as unhealthy which is 
> VERY wrong!
>
> Please exclude all SVTL data files from the navigation file merging 
> process (all  brdc/ hour files) until further notice and re-generate 
> the recent merged navigation files . Thanks.
>
> This is what the svtl files contain ... a mess!! I have already 
> written to the station to stop sending incorrect files and to take 
> measures to correct the problem.
>
>  167: nacho at mac03> more svtl100b.19n
>      2.10           N:  GPS NAV DATA RINEX VERSION / TYPE
> JPS2RIN V1.2.25     JAVAD GNSS          10-Apr-2019 01:59   PGM / RUN 
> BY / DATE
>      .1118D-07   .1490D-07  -.5960D-07  -.5960D-07          ION ALPHA
>      .8806D+05   .1638D+05  -.1966D+06  -.1311D+06          ION BETA
>     -.372529029846D-08 -.621724893790D-14   503808        0 DELTA-UTC: 
> A0,A1,T,W
>     18                                                      LEAP SECONDS
>                                                             END OF HEADER
>  1 99  8 25  2  0  0.0 -.198496971279D-03 -.807176547823D-11 
> .000000000000D+00
>      .690000000000D+02 -.310312500000D+02  .407695553585D-08 
> .264307016689D+01
>     -.169686973095D-05  .863176246639D-02  .101216137409D-04 
> .515366104698D+04
>      .266400000000D+06 -.577419996262D-07 -.210293822457D+01 
> -.143423676491D-06
>      .974915508161D+00  .191937500000D+03  .686769954200D+00 
> -.760960268478D-08
>      .316798910232D-09  .100000000000D+01  .102400000000D+04 
> .000000000000D+00
>      .200000000000D+01  .000000000000D+00  .558793544769D-08 
> .690000000000D+02
>      .266400000000D+06
>  1 19  4 10  1 30  0.0 -.198482477572D-03 -.807531819191D-11 
> .000000000000D+00
>      .114000000000D+03 -.256015625000D+02  .409838499990D-08 
> .238064968064D+01
>     -.134389847517D-05  .863080541603D-02  .100927427411D-04 
> .515366096307D+04
>      .264600000000D+06 -.110827386379D-06 -.210292451118D+01 
> -.138767063618D-06
>      .974914759879D+00  .192453125000D+03  .686646588512D+00 
> -.764901211094D-08
>      .315727437029D-09  .100000000000D+01  .204800000000D+04 
> .000000000000D+00
>      .230400000000D+04  .100000000000D+01  .558793544769D-08 
> .114000000000D+03
>      .264600000000D+06
>
>
> -- 
> Best regards,
> Nacho
> _______________________________________________________________
>
> Ignacio (Nacho) Romero
> Aerospace Engineer, PhD
> CSC Ltd @ ESA/ESOC/OPS-GN
> Satellite Navigation Engineer @ ESOC Navigation Support Office
> IGS Infrastructure Committee Chair
> www.navigation-office.esa.int
> www.canaryspaceconsulting.co.uk
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