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

Sun Jul 16 18:00:55 UTC 2017

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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