[teqc] GLONAS SV ID 255 filter?

Lou Estey lou at unavco.org
Fri Jan 12 07:27:03 MST 2018


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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