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

Lee Woldanski ve7fet at tparc.org
Sun Jul 16 14:48:29 EDT 2017


Go for it, in addition...

The GPS is flagged as NOT HAPPY in TSIP mode if ANY of the following are
TRUE:

If GPS Decoding Status is anything other than "Doing Fixes".

If Disciplining Activity is not Phase Locking or Recovery Mode.

Any Critical Alarms.

Any Minor Alarms.


Lee



On Sun, Jul 16, 2017 at 11:28 AM, Joe Moskalski <kc2irv at gmail.com> wrote:

> I will stick this info in my wiki if you don't mind.
>
> On Jul 16, 2017 2:01 PM, "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/p
>> ages/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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>
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-- 
Lee Woldanski, AScT
VE7FET
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