[time-nuts] Lady Heather V6.0 and RINEX files...
Yes, the altitude error estimates are generally around twice the lat/lon values. I'm currently playing with taking the same 16 hour/1 sec interval data set (from a Trimble Acutime GG receiver) and decimating it to 5/10/30 second intervals and also to 2/4/8/16 hour lengths and seeing how the results change. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Lady Heather V6.0 and RINEX files...
Actually it is that simple. The relevant RINEX commands are in the new "M" (mesurement) keyboard menu. The MW command is used to write the file. MR is used to set the measurement rate (defaiult 1 second). The other commands mostly provide various info that can be added to the RINEX file (marker name, number, antenna type, number, etc). The Trimble and Furuno GT87xx receivers are not the best ones for precise positioning since they only have pseudorange data to work with. The Ublox, NVS, and Venus RTK receivers also output carrier phase data. The Ashtech Z12 is the best since it is L1/L2 with carrier phase data.. As far as "a few minutes"... you need at least a couple of hours of data. 12-24 hours can improve the results by 50+%. I am getting reported error ellipses in the 150mm range (< 10mm for the Z12) --- >I presume this may not be a simple as setting up my Trimble Thunderbolt and Lady Heather V6.0 in the field and gathering RINEX files for a few minutes?? ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Lady Heather V6.0 and RINEX files...
Hi > On Jul 2, 2018, at 6:49 PM, Michael Baker wrote: > > Time Nutters-- > > Mark Sims said of the latest release of Lady Heather: > >> There are several cosmetic tweaks. > > A major new feature is the ability to write RINEX files for receivers that > can output satellite RAW observation data. RINEX files can be processed to > produce very accurate positions (typically 150-250mm for L1 only receivers, > 10mm for L1/L2 receivers). The recommended online processor is CSRS-PPP > from Natural Resources of Canada (NARCAN)... they seem to be the only service > that supports L1 only data. > > > In layman's terms, what does this mean with regard to being > able to set an *AFFORDABLE* GPS RX out in the field and use it > to do site surveys and process the recorded RINEX data later to > establish the geo-position of each of the sites within a precision > of +/- a few centimeters? I presume this may not be a simple as > setting up my Trimble Thunderbolt and Lady Heather V6.0 in the > field and gathering RINEX files for a few minutes?? Even with L1/L2 survey gear, “a few centimeters” is a bit more than a few minutes of data. So far, 24 hour records with L1 gear have given meter level precision. Bob > > Mike Baker > Micanopy, FL > * > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
