[App_rpt-users] RTCM [RX Packet Out of Bounds] ***Updated***
Chuck Henderson
rpt2 at chuck.midlandsnetworking.com
Tue Jun 12 08:34:45 UTC 2018
Kevin,
Which one is the master? From the looks of it I would say that "lab"
should be the master as it appears to be the first one to arrive at the
server so must have the lowest network delay or they are inaccurate.
Inaccuracy could be caused by having the PPS polarity wrong in the RTCM and
are setting time based on the trailing edge of the pulse rather than the
leading edge.
I am also using a Raspberry Pi 3B (not plus)
The master should be the first one to get a time packet to the server, or
they should all be tied exactly.
Chuck
On Mon, Jun 11, 2018 at 8:46 PM Kevin Babich <kevin.babich at gmail.com> wrote:
> Chuck,
>
>
>
> A couple facts:
>
>
>
> The network has very low latency (sub ms) across all nodes on the VLAN.
>
> The site labeled LAB has a lab quality GPSDO, by NOVUS Power.
>
> The other sites utilize the GPSDO, by BG7TBL, as available on eBay, all
> are the 2016 vintage.
>
>
>
> Question:
>
>
>
> Is the reported system time exactly as reported by the timebase? If so,
> it would appear I have an issue with the accuracy of the GPSDO NMEA output.
>
>
>
> Here is an example of the output from my implementation:
>
>
>
> GPSTime (Lab): 06/11/18 20:16:57.000000000
>
> SysTime: 06/11/18 20:16:57.220000
>
> DrainTime: 06/11/18 20:16:57.180
>
> Got GPS (Lab): Lat: 4126.20N, Lon: 08654.13W, Elev: 233.71
>
> GPSTime (Valparaiso): 06/11/18 20:16:57.000000000
>
> SysTime: 06/11/18 20:16:57.280000
>
> DrainTime: 06/11/18 20:16:57.220
>
> Got GPS (Valparaiso): Lat: 4131.82N, Lon: 08702.06W, Elev: 299.5
>
> GPSTime (Crown_Point): 06/11/18 20:16:57.000000000
>
> SysTime: 06/11/18 20:16:57.280000
>
> DrainTime: 06/11/18 20:16:57.220
>
> Got GPS (Crown_Point): Lat: 4121.15N, Lon: 08724.18W, Elev: 218.6
>
> GPSTime (LaPorte): 06/11/18 20:16:57.000000000
>
> SysTime: 06/11/18 20:16:57.280000
>
> DrainTime: 06/11/18 20:16:57.220
>
> Got GPS (LaPorte): Lat: 4139.38N, Lon: 08645.96W, Elev: 324.6
>
>
>
> GPSTime (Lab): 06/11/18 20:17:19.000000000
>
> SysTime: 06/11/18 20:17:19.220000
>
> DrainTime: 06/11/18 20:17:19.180
>
> Got GPS (Lab): Lat: 4126.20N, Lon: 08654.13W, Elev: 233.38
>
> GPSTime (Valparaiso): 06/11/18 20:17:19.000000000
>
> SysTime: 06/11/18 20:17:19.260000
>
> DrainTime: 06/11/18 20:17:19.220
>
> Got GPS (Valparaiso): Lat: 4131.82N, Lon: 08702.05W, Elev: 293.7
>
> GPSTime (Crown_Point): 06/11/18 20:17:19.000000000
>
> SysTime: 06/11/18 20:17:19.280000
>
> DrainTime: 06/11/18 20:17:19.240
>
> Got GPS (Crown_Point): Lat: 4121.15N, Lon: 08724.18W, Elev: 217.5
>
> GPSTime (LaPorte): 06/11/18 20:17:19.000000000
>
> SysTime: 06/11/18 20:17:19.280000
>
> DrainTime: 06/11/18 20:17:19.240
>
> Got GPS (LaPorte): Lat: 4139.38N, Lon: 08645.96W, Elev: 324.1
>
>
>
> Results AFTER resetting the MASTER:
>
>
>
> GPSTime (Lab): 06/11/18 20:31:23.000000000
>
> SysTime: 06/11/18 20:31:23.220000
>
> DrainTime: 06/11/18 20:31:23.180
>
> Got GPS (Lab): Lat: 4126.20N, Lon: 08654.13W, Elev: 231.86
>
> GPSTime (Valparaiso): 06/11/18 20:31:23.000000000
>
> SysTime: 06/11/18 20:31:23.280000
>
> DrainTime: 06/11/18 20:31:23.240
>
> Got GPS (Valparaiso): Lat: 4131.81N, Lon: 08702.05W, Elev: 301.8
>
> GPSTime (LaPorte): 06/11/18 20:31:23.000000000
>
> SysTime: 06/11/18 20:31:23.280000
>
> DrainTime: 06/11/18 20:31:23.240
>
> Got GPS (LaPorte): Lat: 4139.38N, Lon: 08645.96W, Elev: 327.7
>
> GPSTime (Crown_Point): 06/11/18 20:31:23.000000000
>
> SysTime: 06/11/18 20:31:23.280000
>
> DrainTime: 06/11/18 20:31:23.240
>
> Got GPS (Crown_Point): Lat: 4121.15N, Lon: 08724.18W, Elev: 218.5
>
>
>
> Thoughts?
>
>
>
> Kindest Regards,
>
>
>
> Kevin Babich | N9IAA
>
> Valparaiso, IN 46383
>
>
>
> *From:* App_rpt-users <app_rpt-users-bounces at lists.allstarlink.org> *On
> Behalf Of *Chuck Henderson
> *Sent:* Monday, June 4, 2018 4:51 AM
> *To:* Users of Asterisk app_rpt <app_rpt-users at lists.allstarlink.org>
> *Subject:* Re: [App_rpt-users] RTCM [RX Packet Out of Bounds]
> ***Updated***
>
>
>
> Kevin,
>
> I just checked 3 of my RTCM's and got the following results.
> RTCM1:
> Current Time: Mon Jun 04, 2018 08:55:43.640
> Last Rx Pkt System time: 06/04/2018 02:55:56.040, diff: 21587600 msec
> Last Rx Pkt Timestamp time: 06/04/2018 02:55:56.040, diff: 0 msec
> Last Rx Pkt index: 1080, inbounds: 1
>
> RTCM2:
> Current Time: Mon Jun 04, 2018 08:58:20.300
> Last Rx Pkt System time: <System Time Not Set>, diff: -905657056 msec
> Last Rx Pkt Timestamp time: <System Time Not Set>, diff: 0 msec
> Last Rx Pkt index: 0, inbounds: 0
>
> RTCM3:
> Current Time: Mon Jun 04, 2018 08:58:48.060
> Last Rx Pkt System time: <System Time Not Set>, diff: -905629296 msec
> Last Rx Pkt Timestamp time: <System Time Not Set>, diff: 0 msec
> Last Rx Pkt index: 0, inbounds: 0
>
> I would not be concerned about the times. They are not important.
>
> A better thing to look at is in the Asterisk CLI issue the command
> voter debug level 3
>
> Then expect output like the following:
>
> GPSTime (South): 06/04/18 04:07:16.000000000
>
> SysTime: 06/04/18 04:07:16.000000
>
> DrainTime: 06/04/18 04:07:15.960
>
> Got GPS (South): Lat: 4020.80N, Lon: 08856.35W, Elev: 225.7
>
> GPSTime (North): 06/04/18 04:07:16.000000000
>
> SysTime: 06/04/18 04:07:16.000000
>
> DrainTime: 06/04/18 04:07:15.960
>
> Got GPS (North): Lat: 4030.79N, Lon: 08857.99W, Elev: 245.4
>
> GPSTime (East): 06/04/18 04:07:16.000000000
>
> SysTime: 06/04/18 04:07:16.000000
>
> DrainTime: 06/04/18 04:07:15.980
>
> Got GPS (East): Lat: 4030.02N, Lon: 08855.92W, Elev: 250.2
>
> sending KEEPALIVE (GPS) packet to client East digest 99479120
>
> sending KEEPALIVE (GPS) packet to client North digest dd455bb0
>
> sending KEEPALIVE (GPS) packet to client South digest 4a396b22
>
> GPSTime (East): 06/04/18 04:07:17.000000000
>
> SysTime: 06/04/18 04:07:17.000000
>
> DrainTime: 06/04/18 04:07:16.980
>
> Got GPS (East): Lat: 4030.02N, Lon: 08855.92W, Elev: 250.2
>
> GPSTime (South): 06/04/18 04:07:17.000000000
>
> SysTime: 06/04/18 04:07:17.000000
>
> DrainTime: 06/04/18 04:07:16.980
>
> Got GPS (South): Lat: 4020.80N, Lon: 08856.35W, Elev: 225.7
>
> GPSTime (North): 06/04/18 04:07:17.000000000
>
> SysTime: 06/04/18 04:07:17.000000
>
> DrainTime: 06/04/18 04:07:16.980
>
> Got GPS (North): Lat: 4030.79N, Lon: 08857.99W, Elev: 245.4
>
> sending KEEPALIVE (GPS) packet to client East digest 99479120
>
> sending KEEPALIVE (GPS) packet to client North digest dd455bb0
>
> sending KEEPALIVE (GPS) packet to client South digest 4a396b22
>
> GPSTime (South): 06/04/18 04:07:18.000000000
>
> SysTime: 06/04/18 04:07:18.000000
>
> DrainTime: 06/04/18 04:07:17.960
>
> Got GPS (South): Lat: 4020.80N, Lon: 08856.35W, Elev: 225.7
>
> GPSTime (North): 06/04/18 04:07:18.000000000
>
> SysTime: 06/04/18 04:07:18.000000
>
> DrainTime: 06/04/18 04:07:17.980
>
> Got GPS (North): Lat: 4030.79N, Lon: 08857.99W, Elev: 245.4
>
> GPSTime (East): 06/04/18 04:07:18.000000000
>
> SysTime: 06/04/18 04:07:18.000000
>
> DrainTime: 06/04/18 04:07:17.980
>
> Got GPS (East): Lat: 4030.02N, Lon: 08855.92W, Elev: 250.2
>
> GPSTime (South): 06/04/18 04:07:19.000000000
>
> SysTime: 06/04/18 04:07:19.000000
>
> DrainTime: 06/04/18 04:07:18.960
>
> Got GPS (South): Lat: 4020.80N, Lon: 08856.35W, Elev: 225.7
>
> GPSTime (North): 06/04/18 04:07:19.000000000
>
> SysTime: 06/04/18 04:07:19.000000
>
> DrainTime: 06/04/18 04:07:18.960
>
> Got GPS (North): Lat: 4030.79N, Lon: 08857.99W, Elev: 245.4
>
> sending KEEPALIVE (GPS) packet to client East digest 99479120
>
> GPSTime (East): 06/04/18 04:07:19.000000000
>
> sending KEEPALIVE (GPS) packet to client North digest dd455bb0
>
> SysTime: 06/04/18 04:07:19.000000
>
> sending KEEPALIVE (GPS) packet to client South digest 4a396b22
>
> DrainTime: 06/04/18 04:07:18.980
>
> Got GPS (East): Lat: 4030.02N, Lon: 08855.92W, Elev: 250.2
>
> GPSTime (North): 06/04/18 04:07:20.000000000
>
> SysTime: 06/04/18 04:07:20.000000
>
> DrainTime: 06/04/18 04:07:19.960
>
> Got GPS (North): Lat: 4030.79N, Lon: 08857.99W, Elev: 245.4
>
> GPSTime (East): 06/04/18 04:07:20.000000000
>
> SysTime: 06/04/18 04:07:20.000000
>
> DrainTime: 06/04/18 04:07:19.980
>
> Got GPS (East): Lat: 4030.02N, Lon: 08855.92W, Elev: 250.2
>
> GPSTime (South): 06/04/18 04:07:20.000000000
>
> SysTime: 06/04/18 04:07:20.000000
>
> DrainTime: 06/04/18 04:07:19.980
>
> Got GPS (South): Lat: 4020.80N, Lon: 08856.35W, Elev: 225.7
>
>
>
> Ignore the lines I marked in green and only be concerned with the lines
> that have "Time" in them.
>
> Notice that each RTCM has 3 timestamp lines that are mostly together and
> they should be within about 40 ms of each other and should also be within
> about 40ms of the other RTCMs set of lines for that second. (this is with
> no signals present and with a very low network latency between RTCMs and
> the server).
>
>
>
> If you find that one RTCM is many ms out of line with the others, I
> recommend rebooting that one and/or the master one.
>
>
>
> I also recommend not being logged into the RTCMs via telnet except to make
> setting changes. Having an active telnet session to the RTCM can have a
> negative impact on it's ability to maintain time sync lock. Having active
> output on that telnet session will have a negative impact on it's ability
> to maintain time sync lock.
>
>
>
> If the above does not solve your problem then try increasing your tx
> buffer setting to 1400 and see if that eliminates your problem. But do not
> evaluate if the problem is solved while you have an active telnet session
> to the RTCM.
>
>
>
> If you still have a problem then send the output of your "voter debug
> level 3" (with no signals present and no active telnet sessions to RTCMs).
>
> Chuck
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> On Thu, May 31, 2018 at 7:30 PM, Kevin Babich <kevin.babich at gmail.com>
> wrote:
>
> Hayden,
>
>
>
> When running DEBUG = 32, I see the following, but, only on occasion, say
> every minute or so:
>
>
>
> 06/01/2018 00:22:12.240 Warning: GPS Data time period elapsed
>
> GPS-DEBUG:
> $GPRMC,002213.00,A,4131.82046,N,08702.05712,W,0.027,,010618,,,D*6D
>
> GPS-DEBUG: mon: 5, gps_time: 1527812533, ctime: Fri Jun 1 00:22:13 2018
>
>
>
> I suspect this has to do with the receiver losing lock. However, it
> doesn’t make sense as the receiver reports a strong signal and doesn’t show
> signs of loss of signal on the front alarm panel. The GPS antenna is
> designed with high RF immunity and is at a site with little activity.
>
>
>
> Kindest Regards,
>
>
>
> Kevin Babich | N9IAA
>
> Valparaiso, IN 46383
>
>
>
> *From:* App_rpt-users <app_rpt-users-bounces at lists.allstarlink.org> *On
> Behalf Of *Hayden Honeywood
> *Sent:* Thursday, May 31, 2018 5:56 PM
>
>
> *To:* app_rpt-users at lists.allstarlink.org
> *Subject:* Re: [App_rpt-users] RTCM [RX Packet Out of Bounds]
> ***Updated***
>
>
>
> Is the time in UTC? How far off is the system time?
>
>
>
> Have you done a full calibration of each board?
>
> What baud rate do you run on your GPS's?
>
>
>
> I tend to use 9600 baud and have had no issues with the GPS's I have used.
>
>
>
> There is various GPS debug tools available in the RTCM. They are
> documented here -
>
> https://wiki.allstarlink.org/wiki/RTCM_Client#GPS
>
>
>
> Can you possibly try injecting a 9.6MHz signal in place of the crystal on
> board? Perhaps you have a variant of James KI0KN's problem where his
> crystals were off frequency.
>
>
>
> I can't comment on that as I built all my boards and they have external
> frequency references.
>
>
>
> Regards
>
> Hayden VK7HH
>
>
>
>
>
>
>
>
> From: App_rpt-users <app_rpt-users-bounces at lists.allstarlink.org> On
> Behalf Of Hayden Honeywood
> Sent: Wednesday, May 30, 2018 5:34 PM
> To: app_rpt-users at lists.allstarlink.org
> Subject: Re: [App_rpt-users] RTCM [RX Packet Out of Bounds] ***Updated***
>
>
>
> What is your values in voter.conf for RX buffer (960) and in the RTCM
> client for TX buffer (480). Are all RTCM TX buffers set to the same value?
> Yes, 480. These values were based upon the math Jim provided, which is a
> function of maximum latencies on the network. We rarely have greater than
> 1ms to any host on the network.
>
>
>
> Are all the GPS's in a location where they cannot be swamped with RF? Yes,
> and they utilize PCTEL antennas with filtering for use in RF dense
> environments.
>
>
>
> Some users have had success with a dedicated RTCM as the master timing
> source (with no radio connected). Has it been suspected that an RTCM
> doesn’t have the horsepower to handle both functions contemporaneously?
>
>
>
> Regards
>
> Hayden VK7HH
>
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> ------------------------------
>
> Message: 3
> Date: Wed, 30 May 2018 19:51:43 -0500
> From: "Kevin Babich" <kevin.babich at gmail.com>
> To: "'Users of Asterisk app_rpt'"
> <app_rpt-users at lists.allstarlink.org>
> Subject: Re: [App_rpt-users] RTCM [RX Packet Out of Bounds]
> ***Updated***
> Message-ID: <010001d3f879$8c2b3710$a481a530$@gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hayden,
>
>
>
> Do you know what exactly “RX Packet Out of Bounds” refers to? I can infer
> its meaning, but, one can’t be certain. Any thoughts why the system time
> is always so far off? It has always been, since I began experimenting with
> the RTCM in 2012. This is consistent across many RTCM’s.
>
>
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