Re: [time-nuts] LEA-M8T

> The runs I did used a number of modules, not just uBlox products. Some modules > did worse than others on position. I dropped them out of the group before I > moved > on to timing. Hi Bob, I had access to a pre-release ublox combined GNSS receiver a few years ago and found the same thing.

Re: [time-nuts] LEA-M8T

Hi In my case, the antennas were nice brand new NovaTel L/L2/L5 Glonass rated survey antennas. The were up far enough to have a 360 degree view of the sky down to 10 degrees of the horizon. The runs I did used a number of modules, not just uBlox products. Some modules did worse than others on

Re: [time-nuts] LEA-M8T

On Fri, Apr 8, 2016 at 12:06 AM, Tom Van Baak wrote: > Meanwhile it would not surprise me if each GNSS system gives a slightly > different position and a slightly different time than GPS does. One could easily imagine a system that when signals from both constellations were

Re: [time-nuts] LEA-M8T

Hi Been there / done that: The answers on position are off by 3 to 5 meters after multi day self survey. The answers on time are off by even more than that would predict. (> 20 ns but < 100 ns). Bob > On Apr 7, 2016, at 9:14 PM, Hal Murray wrote: > > >

Re: [time-nuts] LEA-M8T

rs, Magnus /tvb - Original Message - From: "Björn" <b...@lysator.liu.se> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Thursday, April 07, 2016 7:43 AM Subject: Re: [time-nuts] LEA-M8T For navigation more measuremen

Re: [time-nuts] LEA-M8T

So... Back to Bob's original observation. He stated that he DID shut off all sats except GPS. So, is the LEA-8MT better or worse than the LEA-6T (or LEA-7T, if available) when only GPS is used? I wouldn't think that it would be worse, but it wouldn't be the first product that an "enhancement"

Re: [time-nuts] LEA-M8T

kb...@n1k.org said: > I agree that should be correct in principle. My observation of the modules > on the market today is that each constellation tends to create it’s own > antenna location. It would be interesting to run two units from the same antenna but using different systems and see how

Re: [time-nuts] LEA-M8T

hol...@hotmail.com said: > I've seen reports that GPS and GLONASS fixes can be off well over 50 meters > when referenced to the same map model. Was that difference stable, or does it wander over time? Was that with a good antenna, or down in the trees or an urban canyon? -- These are my

[time-nuts] LEA-M8T

Yes, they do. They seem to use different orbital, gravity, geoid, TAI, etc models. Trying to merge fixes from different systems leads to all sorts of problem, particularly at nuttery levels. I've seen reports that GPS and GLONASS fixes can be off well over 50 meters when referenced to the

Re: [time-nuts] LEA-M8T

From: "Björn" <b...@lysator.liu.se> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Thursday, April 07, 2016 7:43 AM Subject: Re: [time-nuts] LEA-M8T For navigation more measurements have always been prefered - that is use as

Re: [time-nuts] LEA-M8T

own time” problem. Bob > > -- >Björn > > Originalmeddelande Från: Bob Camp > <kb...@n1k.org> Datum:2016-04-07 18:41 (GMT+07:00) > Till: Bob Stewart <b...@evoria.net>, Discussion of precise time > and frequency measurement &

Re: [time-nuts] LEA-M8T

ll: Bob Stewart <b...@evoria.net>, Discussion of precise time > and frequency measurement <time-nuts@febo.com> Rubrik: Re: > [time-nuts] LEA-M8T > Hi > > Indeed, if you have not turned off the other systems for timing, you will > have issues. Even for > precis

Re: [time-nuts] LEA-M8T

+07:00) Till: Bob Stewart <b...@evoria.net>, Discussion of precise time and frequency measurement <time-nuts@febo.com> Rubrik: Re: [time-nuts] LEA-M8T Hi Indeed, if you have not turned off the other systems for timing, you will have issues. Even for precision navigation, you nee

Re: [time-nuts] LEA-M8T

e to > discover that I've set something wrong in all the many, many data structures. > > Bob > > > > On Wed, 4/6/16, Logan Cummings <logan.cummi...@gmail.com> wrote: > > Subject: Re: [time-nuts] LEA-M8T > To: "Bob S

Re: [time-nuts] LEA-M8T

Hi Bob, Can't speak to jitter accuracy but the M8 series is definitely not the same receiver in the 6 series. As you probably know, M8 introduced multi-GNSS support so in addition to GPS you have Beidou and Glonass satellites. At work we've had some gnashing of teeth about the wider

Re: [time-nuts] LEA-M8T

, many data structures. Bob On Wed, 4/6/16, Logan Cummings <logan.cummi...@gmail.com> wrote: Subject: Re: [time-nuts] LEA-M8T To: "Bob Stewart" <b...@evoria.net>, "Discussion of precise time and frequency measurement&

[time-nuts] LEA-M8T

I recently bought a number of LEA-M8T receivers and I have to say that I am unimpressed, so far. They don't survey to the same reported accuracy as the LEA-6T in the same amount of time. They certainly aren't better in the jitter after sawtooth correction. So, have I managed to overlook some