[IGSSTATION-5436] Re: some receivers misreporting satellite health bits (with firmware version)

Jake Griffiths - NOAA Federal jake.griffiths at noaa.gov
Fri Jun 7 04:18:48 PDT 2013


Dear Colleagues,

I was hoping that recent changes to PRNs 27 & 30 would improve the situation
with the health bits being reported across the IGS network. Unfortunately,
things have not gotten better; they may have gotten worse. For example, see
the table below summarizing the health bits from a global brdc file over
the past 3 days:

Summary for the Health Bits for all PRNs ('.'=healthy; '1'=unhealthy)
-------------------------------------------------------------------------
wwwwd hh  0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3
           1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2
-------------------------------------------------------------------------
17432 00  x . . . x . x x . x . . . x . . . . . x . . . . . . 1 . x 1 . .
17432 02  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17432 04  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . .
17432 06  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17432 08  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17432 10  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . .
17432 12  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . .
17432 14  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17432 16  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17432 18  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17432 20  . . . . . . . . . . . . . . . . . . . . . . . . . . x . . 1 . .
17432 22  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
-------------------------------------------------------------------------
17433 00  x . . . . . . . x x . . . . . . . x . x . . . . . . x . . . . .
17433 02  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17433 04  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . .
17433 06  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17433 08  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17433 10  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . .
17433 12  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . .
17433 14  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17433 16  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17433 18  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17433 20  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17433 22  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
-------------------------------------------------------------------------
17434 00  . . . . . . . . . . . . . x . . . . . x . . . . . . 1 . x . . .
17434 02  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17434 04  . . . . . . . . . . . . . . . . . . . . . . . . . . x . . . . .
17434 06  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17434 08  . . . . . . . . . . . . . . . . . . . . . . . . . . x . . . . .
17434 10  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . .
17434 12  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . .
17434 14  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17434 16  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17434 18  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17434 20  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
17434 22  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
-------------------------------------------------------------------------
wwwwd hh  0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3
           1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2
-------------------------------------------------------------------------

fyi,
jake


On 4/24/2013 1:31 PM, Jake Griffiths - NOAA Federal wrote:
> Dear Colleagues,
>
> Sorry that this comes in spurts, but this should be the last message from me
> on this thread.
>
> I am unsure whether it is diagnostic, but I have managed to collate the
> firmware information from the site logs:
>
> LEICA GRX1200+GNSS        7.80
> LEICA GRX1200+GNSS        8.20
> LEICA GRX1200+GNSS        8.20/4.007
> LEICA GRX1200+GNSS        8.50/6.110
> LEICA GRX1200+GNSS        8.51/6.110
> LEICA GRX1200+GNSS        8.51/6.111
> LEICA GRX1200GGPRO        7.80/3.019
> LEICA GRX1200GGPRO        8.01/3.019
> LEICA GRX1200GGPRO        8.10/3.019
> LEICA GRX1200GGPRO        8.10/IME3.019
> LEICA GRX1200GGPRO        8.20/3.019
> LEICA GRX1200GGPRO        8.20/IME3.019
> LEICA GRX1200GGPRO        8.50/3.019
> LEICA GRX1200GGPRO        8.51/3.019
> LEICA GRX1200GGPRO        GSW
> LEICA GRX1200PRO          7.80/1.25
> LEICA GRX1200PRO          7.80/2.125
> LEICA GRX1200PRO          8.20/IME2.127
> TRIMBLE 4000SSI           7.29
> TRIMBLE 4700              Nav 1.20 Sig 0.0
> TRIMBLE NETR8             4.19
> TRIMBLE NETR8             4.42
> TRIMBLE NETR8             4.43
> TRIMBLE NETR8             4.48
> TRIMBLE NETR9             4.43
> TRIMBLE NETR9             4.62
> TRIMBLE NETR9             4.70
> TRIMBLE NETRS             1.1-5
> TRIMBLE NETRS             1.2-5
> TRIMBLE NETRS             1.3-1
>
> fyi,
> jake
>
> On 4/24/2013 11:19 AM, Jake Griffiths - NOAA Federal wrote:
>> Dear Colleagues,
>>
>> Apologies. My little routine for finding the receiver information
>> had it's own bug. Thanks to Michael Schmidt (NRCan) for detecting it!
>> I think I have corrected the problem. The definitive list of receiver
>> names should be:
>>
>> LEICA GRX1200+GNSS
>> LEICA GRX1200GGPRO
>> LEICA GRX1200PRO
>> TRIMBLE 4000SSI
>> TRIMBLE 4700
>> TRIMBLE NETR8
>> TRIMBLE NETR9
>> TRIMBLE NETRS
>>
>> Thanks for your patience.
>>
>> I will follow up with the firmware versions later. It will take me
>> some time to gather that info.
>>
>> Best,
>> jake
>>
>> On 4/24/2013 10:09 AM, Jake Griffiths - NOAA Federal wrote:
>>> Author: Analysis Center Coordinator
>>>
>>> Dear Colleagues,
>>>
>>> A scan of the GPS navigation RINEX files at NASA/CDDIS for April 23, 2013
>>> (yyyy=2013 doy=113) highlights an ongoing issue with several receiver types
>>> reporting incorrect health bits for PRN30/SVN35. According to NANU 2013022
>>> (e.g., http://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2013022), this satellite
>>> was set unusable until further notice (UNUSUFN) on March 28, 2013.
>>>
>>> The following receiver types:
>>>
>>>    AOA BENCHMARK ACT
>>>    ASHTECH UZ-12
>>>    LEICA CRS1000
>>>    LEICA GRX1200
>>>    LEICA GRX1200GGPRO
>>>    LEICA GRX1200PRO
>>>    TPS E_GGD
>>>    TRIMBLE 4000SSE
>>>    TRIMBLE 4700
>>>    TRIMBLE 5700
>>>    TRIMBLE NETR5
>>>    TRIMBLE NETRS
>>>
>>> at the following IGS stations:
>>>
>>> alic barh brft brmu bzrg cagl cas1 cedu chum coco conz darw dav1 drao hert hnpt
>>> hob2 holb joz2 joze karr lck2 lcki mate maw1 mobs morp nano nico ohi3 pbr2 pbri
>>> pdel pert pgc5 rcmn sfer str1 str2 tid1 tow2 wes2 wtzr xmis yar3 yebe
>>>
>>> however continue to report PRN30/SVN35 as "healthy".
>>>
>>> The main reason to report this is that the navigation files from IGS stations
>>> are assembled to form the global broadcast file (brdc${ddd}0.${yy}n) at the
>>> Data Centers. Having some stations misreport the health status causes confusion
>>> when a user attempts to examine the health bits for the entire constellation
>>> over an extended period of time. The following table is a nice example:
>>>
>>> Summary for the Health Bits for all PRNs ('.'=healthy; '1'=unhealthy)
>>> -------------------------------------------------------------------------
>>> wwwwd hh  0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3
>>>            1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2
>>> -------------------------------------------------------------------------
>>> 17372 00  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
>>> 17372 02  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
>>> 17372 04  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
>>> 17372 06  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . .
>>> 17372 08  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . .
>>> 17372 10  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . .
>>> 17372 12  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . .
>>> 17372 14  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . .
>>> 17372 16  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . .
>>> 17372 18  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
>>> 17372 20  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
>>> 17372 22  . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . 1 . .
>>> -------------------------------------------------------------------------
>>> wwwwd hh  0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3
>>>            1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2
>>> -------------------------------------------------------------------------
>>>
>>> Incorrect health bits can also cause issues for software that resamples and
>>> transforms the broadcast ephemerides into ECEF coordinates.
>>>
>>> I suspect the issue arises from a firmware bug or that the receivers need their
>>> memory flushed. Though, of course, any mitigating action should be taken so as
>>> to minimize the impacts to users.
>>>
>>> FYI,
>>> jake
>>>



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