[time-nuts] nuts about position
Heather now requests the RAW and RAWX messages... those output carrier phase, doppler, and pseudo ranges.The M8N does not support either, but the M8T supports RAWX. Heather now requests the SFRB and SFRBX messages... those output the satellite navigation messages. All the M8's output SFRBX. I cranked up the M8N baud rate to 115200 and the receiver can handle all the various raw messages But the bugaboo is requesting the TRK-MEAS and TRK-SFRBX messages. The messages are not officially supported, Ublox forbids talking about them on their forums... they might even dispatch Ninja assassins if you talk about them. If you request those messages on the M8N very bad things seem to happen... you start receiving messages 0x27-0x00 with a length of either 68 bytes or around 1300-1400 bytes. Whatever 0x27-0x00 is, nobody's talking... The 0x27 message group is for security features like chip serial numbers. I have an M8T on the way from Germany... -- > I think heather is parsing the UBX_RAW_RATE messages for the raw GPS meansurements. The LEA-6T allows UBX_RAW_RATE, but the NEO-M8N does not. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] nuts about position
Yo Mark! On Tue, 1 May 2018 02:48:17 + Mark Sims wrote: > A LEA-6T seems to be able to cope with the data stream at it's > default 9600 baud. I just tried a NEO-8N and it drops packets, I think heather is parsing the UBX_RAW_RATE messages for the raw GPS meansurements. The LEA-6T allows UBX_RAW_RATE, but the NEO-M8N does not. RGDS GARY --- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 g...@rellim.com Tel:+1 541 382 8588 Veritas liberabit vos. -- Quid est veritas? "If you can’t measure it, you can’t improve it." - Lord Kelvin pgpX8JFrYGSwt.pgp Description: OpenPGP digital signature ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] nuts about position
I once spent way too much time trying to get Heather to spit out a RINEX file from a Thunderbolt. I could never get any of the post-processors to accept it. The Thunderbolt's raw data needs to somehow be tweaked to be compatible and I didn't really know what I was doing. A LEA-6T seems to be able to cope with the data stream at it's default 9600 baud. I just tried a NEO-8N and it drops packets, etc. Even weirder, it does not output any of the requested packets that might be flooding the port, but still drops packets. --- > You mean that LH does not translate the data to the correct format *and* > submit it for post processing ? There *is* a lot of data when you turn all this stuff on. If you can get above 115K baud, it’s well worth it. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] IEEE Fellows UFFC-Society
Thanks Ulrich for bringing this to my attention. So, the new entry from the T&F side is David Howe, NIST. It's not a bad achievement, behind this. Just go to the NIST T&F library and read his articles, and then consider heading the phase-noise group at NIST. Dave is now semi-retired from NIST, only doing a few things. Congratulations Dave! Cheers, Magnus On 04/30/2018 11:50 PM, Ulrich Rohde via time-nuts wrote: > https://ieee-uffc.org/membership/fellows/ieee-fellows-of-the-uffc-society/ > > Updated list 73 de Ulrich > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] nuts about position
Hi You mean that LH does not translate the data to the correct format *and* submit it for post processing ? There *is* a lot of data when you turn all this stuff on. If you can get above 115K baud, it’s well worth it. = One important qualifier to re-state. L1 post processing is very dependent on the distance to an “open” source of correction data. The spacing of those sites over the US is highly variable. If you get outside the US it is very much a “that depends” sort of thing. Some countries apparently don’t have the same sort of open site network that we have in the US. Bob > On Apr 30, 2018, at 4:36 PM, Mark Sims wrote: > > Coincidentally, yesterday I tweaked up Lady Heather's Ublox code to enable > all of the necessary raw data messages. Heather also enables the raw > messages from Trimble TSIP speaking receivers, the NVS CSM24 receiver, and > the Furuno GT87 receiver (if baud rate is >=115200). > > Heather can write a raw data capture file (/dr=filename on the command line > or WY from the keyboard). You should be able to convert those raw capture > files to RINEX and then post-process those. > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] IEEE Fellows UFFC-Society
https://ieee-uffc.org/membership/fellows/ieee-fellows-of-the-uffc-society/ Updated list 73 de Ulrich ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] nuts about position
Coincidentally, yesterday I tweaked up Lady Heather's Ublox code to enable all of the necessary raw data messages. Heather also enables the raw messages from Trimble TSIP speaking receivers, the NVS CSM24 receiver, and the Furuno GT87 receiver (if baud rate is >=115200). Heather can write a raw data capture file (/dr=filename on the command line or WY from the keyboard). You should be able to convert those raw capture files to RINEX and then post-process those. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] nuts about position
Hi If you are looking at doing a self survey on a timing module, there is a lot of information in the archives. It turns out that (like it or not) there is very likely to be a ~24 hour periodicity in your self survey data. Therefor something like a two, three, or four day survey will enhance your position estimate. Again - for all get gory details dig into the archives. Since the timing is done against the module’s “best estimate” of it’s position, there isn’t a lot of benefit in having a surveyed correct position instead. More or less, the same errors that goofed the position also goof the timing in the same direction. Again, info in the archives. Bob > On Apr 30, 2018, at 2:41 PM, Achim Gratz wrote: > > Tim Lister writes: >> It has taken me quite a bit longer that I had hoped but I have finally >> published a writeup and howto of collecting raw ublox data, converting >> it to RINEX and how to do (or get the NRC experts to do) the >> post-processing. It's at a new website I have setup: >> https://adventuresinprecision.space/howtos/precise-gps-positions/ >> Please let me know any comments or suggestions you have to improve it >> or make it more comprehensible and comprehensive. > > Thanks for taking the time to write that up. Out of curiosity, how far > away from the RINEX coordinates is an RMS or median of the original > coordinates as recorded by the GPS and how does the convergence curve > look like? I'm trying to gauge how long I need to run my timing module > in survey mode… > > > Regards, > Achim. > -- > +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+ > > Wavetables for the Waldorf Blofeld: > http://Synth.Stromeko.net/Downloads.html#BlofeldUserWavetables > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] nuts about position
Tim Lister writes: > It has taken me quite a bit longer that I had hoped but I have finally > published a writeup and howto of collecting raw ublox data, converting > it to RINEX and how to do (or get the NRC experts to do) the > post-processing. It's at a new website I have setup: > https://adventuresinprecision.space/howtos/precise-gps-positions/ > Please let me know any comments or suggestions you have to improve it > or make it more comprehensible and comprehensive. Thanks for taking the time to write that up. Out of curiosity, how far away from the RINEX coordinates is an RMS or median of the original coordinates as recorded by the GPS and how does the convergence curve look like? I'm trying to gauge how long I need to run my timing module in survey mode… Regards, Achim. -- +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+ Wavetables for the Waldorf Blofeld: http://Synth.Stromeko.net/Downloads.html#BlofeldUserWavetables ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
