Re: [time-nuts] tracking position & orientation

Sorry, I read it as "NRCAN wil *only* do L1" -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

Re: [time-nuts] tracking position & orientation

No... NRCAN is one of the few that do not require both L1 and L2 observables. It also accepts only L1. /Björn Sent from my iPhone > On 23 Nov 2019, at 08:22, Poul-Henning Kamp wrote: > > > In message > , > Mark Sims writes: > >> NRCAN / csrs-ppp will do L1 only data. Typical

Re: [time-nuts] tracking position & orientation

In message , Mark Sims writes: >NRCAN / csrs-ppp will do L1 only data. Typical results have errror ellipses >in the 300-500 mm range. Then your RINEX files must have some flaw in them. NRCAN process both L1 and L2: OBS G L1C L2C C1C C2C I get horizongal uncertainties of

Re: [time-nuts] tracking position & orientation

Hi If NIST puts their real time data on any of the networks, you may be able to shortcut the process. Goddard puts up data so indeed NIST may also do so. The trick is to stream the data real time into the F9P or into a PC. You effectively solve for the distance and bearing to the “reference”

[time-nuts] tracking position & orientation

NRCAN / csrs-ppp will do L1 only data. Typical results have errror ellipses in the 300-500 mm range. It also seems to be the only free site that handles RINEX V3.xx data. They only use GPS and GLONASS measurements, -- >I do not know of any free sites that will post process “L1

Re: [time-nuts] tracking position & orientation

I lived near Lyons, CO for about 20 years. ISTR that there is a fault line in CO, I think on the western slope. DaveD Sent from a small flat thingy > On Nov 22, 2019, at 02:36, Hal Murray wrote: > > > e...@scace.org said: >> I moved to Boulder CO a few months ago. The “curiosity” is to

Re: [time-nuts] tracking position & orientation

On 11/22/19 10:17 AM, Eric Scace wrote: Thank you, everyone, for your enthusiastic guidance and observations to my quirky question. Quite a few mentioned the difficulties in measuring rotation over a short baseline. In response to the question of “is there another measurement point 10

Re: [time-nuts] tracking position & orientation

>For millimeter-scale position determination, this sounds like a >more difficult situation. The house is generally wood framing with >some structural steel elements (not in useful locations). Position >measurements would contain noise from the diurnal/seasonal changes >of the house framing. Maybe

Re: [time-nuts] tracking position & orientation

Thank you, everyone, for your enthusiastic guidance and observations to my quirky question. Quite a few mentioned the difficulties in measuring rotation over a short baseline. In response to the question of “is there another measurement point 10 miles away”, the quick answer is yes: NIST

Re: [time-nuts] tracking position & orientation

On 11/22/19 12:21 PM, Tim Lister wrote: > You probably don't need to wait that many days for the Final GPS > satellite orbits; the IGS products page > (https://www.igs.org/products)shows that even the real-time > ultra-rapid products are a factor of 20x better in the orbit (but > interestingly

Re: [time-nuts] tracking position & orientation

On Fri, Nov 22, 2019 at 9:01 AM Bob kb8tq wrote: > > Hi > > At least right now, it is the “king of the hill” in terms of low cost modules > that > will do L1 / L2. > > If the target application is precision survey work, you do want (at least) > dual > band reception. All of the post processing

Re: [time-nuts] tracking position & orientation

On 11/22/19 5:04 AM, Bob kb8tq wrote: Hi Indeed, I do a better job of detecting the impact of humidity ( = rainy season ) on my deck then I do detecting anything else on a fairly short baseline. I *do* get correct distances and angles between the antennas (as verified with a tape measure).

Re: [time-nuts] tracking position & orientation

Hi At least right now, it is the “king of the hill” in terms of low cost modules that will do L1 / L2. If the target application is precision survey work, you do want (at least) dual band reception. All of the post processing outfits are looking for that sort of data. I do not know of any

Re: [time-nuts] tracking position & orientation

Hi Indeed, I do a better job of detecting the impact of humidity ( = rainy season ) on my deck then I do detecting anything else on a fairly short baseline. I *do* get correct distances and angles between the antennas (as verified with a tape measure). One thing you can do (with some effort)

Re: [time-nuts] tracking position & orientation

> The “cheap” approach these days is to use a uBlox ZED-F9P There are a zillion GPS modules available these days. Is there something special about that one? How many others provide whatever is needed to make RINEX files? -- These are my opinions. I hate spam.

Re: [time-nuts] tracking position & orientation

Eric, Good idea to experiment with an antenna on each end of the house. You'll get all sorts of data and your eyes will be eager to read house movement into the plots. The problem is you won't know for sure if the results are real or not; there are many factors, especially for a house made of

Re: [time-nuts] tracking position & orientation

> What hardware/software would be suitable for a TimeNuts (PositionNuts?) > project like this? You want 'gpsd' which can collect RINEX files for you, and then run them through https://webapp.geod.nrcan.gc.ca/geod/tools-outils/ppp.php Where you remember to pick "ITRF"

Re: [time-nuts] tracking position & orientation

Hi, You would probably want to have three antennas and receivers, and we talk about choke-ring antennas and two-frequency receivers. You should have your receivers hooked up to a common clock, such as a rubidium clock. The continental drift is measureable by GPS, and is in the range of mm/year.

Re: [time-nuts] tracking position & orientation

e...@scace.org said: >I moved to Boulder CO a few months ago. The “curiosity” is to determine > the position of two antennas at either end of my house and monitor it over > time, with the idea that one could see plate movement in 3 dimensions plus > rotation around the axes. How much

Re: [time-nuts] tracking position & orientation

Hi The “cheap” approach these days is to use a uBlox ZED-F9P https://www.digikey.com/products/en/rf-if-and-rfid/rf-evaluation-and-development-kits-boards/859?k=F9P along with one (or

[time-nuts] tracking position & orientation

I need another project like a hole in the head — but curiosity continues to nag me. I moved to Boulder CO a few months ago. The “curiosity” is to determine the position of two antennas at either end of my house and monitor it over time, with the idea that one could see plate movement in