[aprssig] TAPR Differential GPS Reference Station

Gerry Creager gerry.creager at tamu.edu
Thu Apr 23 15:23:23 EDT 2009

A simple averaging system will eventually work... over a period of 
weeks.  However, a simplified system that decorrelates the data by 
taking positoins every 30- to 60-sec for some relatively large number of 
samples, at least one day (24 hours) would provide a decently accurate 
position in 2D.  Getting height right is a hit or miss proposition, 
however, using only L1.  If one were to use the aforementioned 
decimation approach with a modern receiver with WAAS enabled, one would 
have a much better 3D "survey".


Cap Pennell wrote:
> And (not APRS, but) Stan Huntting KW7KW created SAwatch to do the smoothing
> too, and it works with the TAPR DGPS Reference Station Interface Board.
> http://www.huntting.com/sawatch/
> http://www.tapr.org/gps_dgps.html#gpsoncore
> 73, Cap
>> -----Original Message-----
>> From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On
>> Behalf Of Steve Dimse
>> Sent: Tuesday, April 21, 2009 5:15 PM
>> To: k5ykg at arrl.net; TAPR APRS Mailing List
>> Subject: Re: [aprssig] TAPR Differential GPS Reference Station
>> I forget the exact algorithm TAC-2 used, it was some sort of
>> averaging. If I recall right the length was user-programmable but I
>> think 24 hours was recommended.
>> Steve
>> On Apr 21, 2009, at 7:56 PM, Boyd Prestwood K5YKG wrote:
>>> Steve, Wasn't this something like an "averaging" of accumulated
>>> positions over that 24-hour period?  Then those coordinates were
>>> programmed into the Ref Station?
>>> It would be appreciated if anyone else knows how any of the client
>>> applications massaged or used any of this data, they could chime in
>>> here.
>>> Thanks Steve.
>>> 73 de Boyd 
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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

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