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[aprssig] TAPR Differential GPS Reference Station

Steve Dimse steve at dimse.com
Fri Apr 24 22:43:30 UTC 2009


For the SA removal, it was actually much faster than a period of  
weeks, there was a specific interval that matched the SA algorithm  
that gave excellent results.

Steve K4HG

On Apr 23, 2009, at 3:23 PM, Gerry Creager wrote:

> 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".
>
> gerry
>
> 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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