Order Tray | Contact Us | Home | SIG Lists

[aprssig] DGPS?

Steve Noskowicz noskosteve at yahoo.com
Thu Apr 10 05:06:36 UTC 2008



Sorry Gerry...  Over my head.

73, Steve, K9DCI


--- Gerry Creager <gerry.creager at tamu.edu> wrote:

> More to the point, without decoupling the autocorrelation component of 
> positioning, averaging will not result in a statistically satisfactory 
> value.  In other words, it really doesn't get better with a larger 
> sample unless your sample is, well, infinitely large.
> 
> Reducing teh sampling rate to, e.g., 1 min between each sample should be 
> sufficient to remove the autocorrelation component for most users of 
> code-phase operation.
> 
> Geodetically yours,
> Gerry
> 
> Steve Noskowicz wrote:
> > 
> >    Of course.  Sorry if I was vague, but I thought it was obvious in
> referring
> > to a stationary posit.  
> >    Going back and refreshing my knowledge from some DGPS sites, I see this
> is
> > was a dumb question and averaging is obviously invalid.  DGPS applies
> measured
> > corrections correcting the location error inherent in the basic GPS system.
> 
> > Too bad the DGPS data stream is so complex or it would be easier to tap
> into
> > the data for an average hacker without one of the DGPS receivers.
> >    I suspect averaging only minimizes the error to the location which is
> > defined by the limit of the basic system accuracy.  DGPS would be needed to
> get
> > to the" true" location.
> > 
> > 
> > 
> > --- Jason KG4WSV <kg4wsv at gmail.com> wrote:
> > 
> >> On Fri, Apr 4, 2008 at 7:51 PM, Steve Noskowicz <noskosteve at yahoo.com>
> wrote:
> >>
> >>>  Possibly related - can't you just do a long term average of the posits
> to
> >>>  improve accuracy?
> >> I don't think that technique is too effective when you're moving...
> >>
> >> (:
> >>
> >> -Jason
> >> kg4wsv
> >>
> >> _______________________________________________
> >> aprssig mailing list
> >> aprssig at lists.tapr.org
> >> https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> >>
> > 
> > 
> 
> -- 
> Gerry Creager -- gerry.creager at tamu.edu
> Texas Mesonet -- AATLT, Texas A&M University	
> Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.862.3983
> Office: 1700 Research Parkway Ste 160, TAMU, College Station, TX 77843
> 
> _______________________________________________
> aprssig mailing list
> aprssig at lists.tapr.org
> https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> 


-- 
73, Steve, K9DCI

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 




More information about the aprssig mailing list