[teqc] GLONAS SV ID 255 filter?

lplopresti at enter.net lplopresti at enter.net
Fri Jan 12 08:17:06 MST 2018


Lou,

As we move forward it will be more common to use ranging distances from 
SBAS satellites to improve solutions, I believe the L5 correction signal 
from SBAS is intended to also be used for ranging. In that case would it 
not be prudent to allow the possibility of a 3 digit number to 
accommodate SBAS. In other words since a fix is necessary turn it into 
room for improvement. Thus bogus R255 (etc.) can be removed in normal 
fashion.

Lawrence Paul Lopresti, PE, PLS

On 2018-01-12 09:27, Lou Estey wrote:
> hi Isaac,
> 
> I've confirmed that this occurs with the latest teqc release.  Looking
> into it ...
> 
> Meanwhile, the only way I see to correct this is to manually edit the 
> file,
> globally replacing 'R255' with, say, 'R55'.  Then verify that teqc's
> happy with it:
> 
> teqc -warn +v +R1-55 edited_RINEX_file
> 
> (You should get: "teqc: 'edited_RINEX_file' readable as RINEX V.2.11 
> format")
> 
> Then filter out R55:
> 
> teqc -warn -R55 edited_RINEX_file > filtered_RINEX_file
> 
> ... all of which I tested and should work.
> 
> --lou
> 
> On 12-Jan-18 02:01 AM, Isaac Hoyas Ester wrote:
>> Lou, Evon, appreciated, yes, you are correct, the RINEX file was 
>> generated by TEQC out of ublox raw data, both files (RINEX obs and 
>> ublox
>> UBX) can be downloaded from 
>> https://www.dropbox.com/sh/uchby3qqdqukz76/AAAreomJNy3r8cmoXcSh1K0Xa?dl=0
>> 
>> --- Isaac
>> 
>> A 12.01.2018 12:00 AM, Lou Estey escrigué>> Yes, that's right.  So 
>> 'R255' in an obs file means it breaks the RINEX specification.
>>> 
>>> --lou
>>> 
>>>> Out of curiosity, isn't the SV designation required to be exactly 
>>>> one letter and two numbers?
>>>> 
>>>> Evon
>>>> 
>>>> On Thu, Jan 11, 2018 at 8:08 AM, Lou Estey <lou at unavco.org 
>>>> <mailto:lou at unavco.org>> wrote:
>>>>     Isaac,
>>>> 
>>>>     Did teqc generate the RINEX file with 'R255', as shown below?
>> 
>>>>     On 11-Jan-18 09:04 AM, Isaac Hoyas Ester wrote:
>>>>         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 <tel: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 <tel: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 <tel:19565957.947> 40.000 
>>>> -3400.356
>>>>         102423064.459 6 19173840.114 <tel:19173840.114> 40.000 
>>>> -2393.646
>>>> 
>>>>         Many thanks for your support.
>>>> 
>>>>         Best Regards
>>>> 
>>>>         Isaac
> 
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