[App_rpt-users] RTCM Going Off Line - Trimble Loosing Lock

Tim Sawyer tisawyer at gmail.com
Sun Jul 16 15:14:58 EDT 2017


Thank you, Lee.

You did some digging there and spent some time at it. That's really great
of you. Much appreciated!

On Sun, Jul 16, 2017 at 11:00 AM, Lee Woldanski <ve7fet at tparc.org> wrote:

> Hi Tim,
>
> I dug in to the source to help figure this out... someone should put this
> in a wiki somewhere...
>
> The VOTER/RTCM when in TSIP mode (Trimble), assumes it is a Trimble
> Thunderbolt and is looking for two packets:
>
> 0x8F-AB - Primary Timing Packet
> 0x8F-AC - Supplemental Timing Packet
>
> Grab a copy of the Thunderbolt User Guide: http://leapsecond.com/
> pages/tbolt/Thunderbolt-2012-02.pdf
>
> Pages 78-83 are the important ones.
>
> Packet 0x8F-AB is what grabs the timing information, and packet 0x8F-AC is
> what it looks at for everything else (including debug).
>
> The debug string that the VOTER/RTCM reports:
>
> printf("GPS-DEBUG: TSIP: ok %d, 9 - 14: %02x %02x %02x %02x %02x %02x\n",
> happy,gps_buf[9],gps_buf[10],gps_buf[11],gps_buf[12],gps_
> buf[13],gps_buf[14]);
>
> So, the 1 after ok is the "happy.gps" flag. The other 5 bytes are supposed
> to be bytes 9-14 from the packet... sort of. They are bytes 9-14 of the
> buffer, but they are actually bytes 8-13 of the message.
>
> Looking at the message structure, bytes 8-13 are:
>
> 8-9 Critical Alarms
> 10-11 Minor Alarms
> 12 GPS Decoding Status
> 13 Disciplining Activity
>
> Therefore, the messages you are seeing break down as follows:
>
> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00 - everything is good in
> the 'hood, Doing Fixes, Phase Locking
>
> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 18 08 06 - not happy, Not Tracking
> Satellites, Not Disciplining Oscillator (0x18 --> 0b000000011000), No
> Usable Sats, Inactive
>
> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 08 08 05 - not happy, Not Tracking
> Satellites, No Useable Sats, Compensating OXCO (holdover)
>
> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 00 00 05 - not happy, Compensating
> OXCO (holdover)
>
> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08 - happy, Recovery Mode
>
> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 00 00 04 - not happy, Initializing
> Loop Filter
>
>
> Why you are losing lock... can't help you there. Perhaps you have an
> antenna going bad, wet feedline, LNA in the antenna not receiving voltage,
> sky obstruction, or interference.
>
>
> Cheers!
>
>
> Lee
>
>
> On Mon, Jul 10, 2017 at 1:49 PM, Tim Sawyer <tisawyer at gmail.com> wrote:
>
>> There is a pattern to the debug out put which looks like below. Sure
>> would like to decode this:
>>
>> It's happy when there are all zeros. Then it does 18 08 06
>>
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 18 08 06
>> 07/10/2017 20:35:42.100  GPS signal lost entirely. Starting again...
>> 07/10/2017 20:35:42.100  Host Connection Lost (Pri) (192.168.1.6)
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 08 08 05
>> GPS Receiver Active, waiting for aquisition
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 08 08 05
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 08 08 05
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 08 08 05
>>
>> Repeats, trimmed for brevity.
>>
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 08 08 05
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 08 08 05
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 00 00 05
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 00 00 05
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 00 00 05
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 00 00 05
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 00 00 05
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>> GPS signal acquired
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>> 07/10/2017 20:36:03.100  Time now syncronized to GPS
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>> 07/10/2017 20:36:03.500  Host Connection established (Pri) (192.168.1.6)
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>>
>> Repeats, trimmed for brevity.
>>
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 00 00 04
>> 07/10/2017 20:36:52.200  GPS signal lost entirely. Starting again...
>> 07/10/2017 20:36:52.220  Host Connection Lost (Pri) (192.168.1.6)
>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 00 00 04
>> GPS Receiver Active, waiting for aquisition
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>> GPS signal acquired
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>> 07/10/2017 20:36:56.220  Time now syncronized to GPS
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>> 07/10/2017 20:36:56.500  Host Connection established (Pri) (192.168.1.6)
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>>
>> Now it will have all zeros until the next loss, which could be minutes or
>> hours.
>>
>> On Mon, Jul 10, 2017 at 1:29 PM, Jesse Lloyd <ve7lyd at gmail.com> wrote:
>>
>>> I've had problems with the VHF transmitter antennas being too close to
>>> the GPS antenna and RF swamping it. If you go to site and use the Trimble
>>> software to see satellite signal data then key the transmitter, mine would
>>> show a loss of almost all the satellites.
>>>
>>> Cheers,
>>> Jesse
>>>
>>> On Jul 10, 2017, at 1:17 PM, Tim Sawyer <tisawyer at gmail.com> wrote:
>>>
>>> My RTCM, two of then actually on the same Trimble, are loosing lock of
>>> late. The output from the RTCM Debug mode 40 is shown below. I read that
>>> all zeros was good but I'm wondering 08 and 04 in the last byte mean. Does
>>> any know how to decode this?
>>>
>>>
>>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>>>
>>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>>>
>>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>>>
>>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>>>
>>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>>>
>>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 08
>>>
>>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 00 00 04
>>>
>>> 07/10/2017 20:08:22.160  GPS signal lost entirely. Starting again...
>>>
>>> 07/10/2017 20:08:22.160  Host Connection Lost (Pri) (192.168.1.6)
>>>
>>> GPS-DEBUG: TSIP: ok 0, 9 - 14: 00 00 00 00 00 04
>>>
>>> GPS Receiver Active, waiting for aquisition
>>>
>>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>>>
>>> GPS signal acquired
>>>
>>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>>>
>>> 07/10/2017 20:08:26.160  Time now syncronized to GPS
>>>
>>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>>>
>>> 07/10/2017 20:08:26.500  Host Connection established (Pri) (192.168.1.6)
>>>
>>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>>>
>>> GPS-DEBUG: TSIP: ok 1, 9 - 14: 00 00 00 00 00 00
>>>
>>>
>>> --
>>> --
>>> Tim
>>>
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>>
>>
>>
>> --
>> --
>> Tim
>>
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>
>
>
> --
> Lee Woldanski, AScT
> VE7FET
>
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-- 
--
Tim
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