[teqc] inexplicable value on Galileo Navigation Message

Operation Regina regina.operation at cnes.fr
Wed Jan 30 06:55:59 MST 2019


Dear Lou,

Thank you for your return. 

Yes we track IRNSS SV also

You saying "it's due to limited information", does it mean that the problem coming from receiver ?


Best Regards/ Meilleures Salutations



Grégory Bonnes 
Regina Project
TELESPAZIO France support for CNES's operations
CST 18 av. Edouard Belin, 31401 Toulouse Cedex 9 France
 +33 (0)5 61 27 31 31 (office 7.56.10)
 gregory.bonnes at cnes.fr / regina.operation at cnes.fr
 cnes.fr 

    





-----Message d'origine-----
De : teqc <teqc-bounces at postal.unavco.org> De la part de Lou Estey
Envoyé : mardi 29 janvier 2019 18:34
À : Bonnes Gregory (TELESPAZIO FRANCE) <gregory.bonnes at cnes.fr>
Cc : teqc support discussion list <teqc at postal.unavco.org>
Objet : Re: [teqc] inexplicable value on Galileo Navigation Message

Gregory,

Back to the Galileo "data sources" value:

I'm retracting the bug guess, and now saying it's due to limited information.
In the RINEX spec for defining the Galileo data sources value:

bit 0 set: I/NAV E1-B
bit 1 set: F/NAV E5a-I
bit 2 set: I/NAV E5b-I

... and then a note that both bits 0 and 2 can be set if the navigation messages are merged.
Then:

bit 3 reserved for Galileo internal use
bit 4 reserved for Galileo internal use
bit 8 set: af0-af2, ToC, SISA are for E5a,E1 bit 9 set: af0-af2, ToC, SISA are for E5b,E1 bits 8-9; exclusive (only one bit can be set)

However, in the Trimble .tgd record 28 (one record 28 for each decoded Galileo navigation message), all that I know for sure is that the sources is one of the following:

I/NAV E1-B
F/NAV E5a-I
I/NAV E5b-I

The last two cases can unambiguously have bit 8 or 9 set.  However, if the source is designated I/NAV E1-B, all that can set unambiguously is bit 0 -- which yields the value of 1 that you are reporting.

--lou

On 29-Jan-19 09:59 AM, Lou Estey wrote:
> Gregory,
> 
> It looks like you're into a whole bunch of bleeding edge pieces with this Alloy:
> 
> [744] teqc +all -O.sum . allo______201901192300A.tgd ? Error ? 
> translation of 'allo______201901192300A.tgd' may have started with GPS 
> week 2038 rather than 2036
>          (try using '-week 2036' option) ! Notice ! unknown Trimble 
> antenna type (Trimble .dat record 16)= '0S' in 'allo______201901192300A.tgd'
> ! Warning ! constellation ID 9 detected in 'allo______201901192300A.tgd'
> .dat 27/0x57-6: unknown SV type= 9
> ! Notice ! 'allo______201901192300A.tgd' contains Beidou data w/ 
> 'block type'= 2 'track type'= 8 of unknown type ... skipping ...
> 
> There's been testing on an Trimble Alloy here at UNAVCO, but I haven't 
> seen any of this on the data files from ours -- and we have been tracking Beidou SVs.
> 
> Is this by any chance tracking one or more IRNSS SVs?
> 
> --lou
> 
> On 29-Jan-19 09:36 AM, Bonnes Gregory (TELESPAZIO FRANCE) wrote:
>> Yes !
>>
>>
>> -----Message d'origine-----
>> De : Lou Estey <lou at unavco.org>
>> Envoyé : mardi 29 janvier 2019 17:32
>> À : Bonnes Gregory (TELESPAZIO FRANCE) <gregory.bonnes at cnes.fr> Cc : 
>> teqc support discussion list <teqc at postal.unavco.org> Objet : Re: 
>> [teqc] inexplicable value on Galileo Navigation Message
>>
>> On 29-Jan-19 09:29 AM, Bonnes Gregory (TELESPAZIO FRANCE) wrote:
>>> Dear all,
>>>
>>> I do some test with the last version of teqc and with data coming 
>>> from the receiver Alloy (Trimble) in version 5.37
>>>
>>> I don't understand the meaning of the value " 1.000000000000D+00 "
>>> (broadcast orbit number 5, Data sources) in the E21 first block. The 
>>> data sources should be 258, 516 or 513  for INAV et FNAV. Is there a reason for this value ?
>> Gregory,
>>
>> Obviously a bug!  Can you provide the input data file?
>>
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> Louis H. Estey, Ph.D.              office:  [+001] 303-381-7456 
>> UNAVCO, 6350 Nautilus Drive           FAX:  [+001] 303-381-7451 
>> Boulder, CO  80301-5554            e-mail:  lou  unavco.org
>>
>> "If the universe is the answer, what is the question?"
>>                                                -- Leon Lederman > 
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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