[teqc] Single avg position (cart or geo) as output?

Lou Estey lou at unavco.org
Sat Aug 27 16:56:17 MDT 2005


I'd say the order of magnitude error is about 100 m.
(The delta below is 90 m.)

--lou

> Thanks Lou.
> 
> We did a [very simple] comparison between the XYZ spat from teqc to 
> those produced by Gamit utility (sh_rx2apr) for the same file/session 
> (campaign - 45' only) and got about the following:
> 
>     diff x:  16
>     diff y: -56
>     diff z:  69
> 
> This was after applying "+ap".  The differences were higher (about 2x) 
> without the +ap.  Do you have a grasp at all for ballpark precision one 
> should pin these numbers to from teqc?  +- 20m, 50m, 100m, 1000m?  And, 
> how precision will change with duration of session?  Just curious.  It's 
> already good enough for my original purpose but now we want to know how 
> far we can go.  :)
> 
> Thanks,
> 
> Michael
> 
> 
> 
> *******************************************************
>           Michael Scharber
>     Scripps Institution of Oceanography
>     Institute of Geophysics and Planetary Physics
>     8785 Biological Grade
>     IGPP Room 4212
>     La Jolla, CA 92037
> 
>         mscharber at gpsmail.ucsd.edu
>     (858)534-1750
> *******************************************************
> 
> On Thu, 18 Aug 2005, Lou Estey wrote:
> 
>> Steve's suggestion is AOK, but there are some other things
>> that might be of interest.  Michael was asking for a mean position,
>> and normally teqc just turns the last point position it
>> determined.  There is an option (that I haven't tested in
>> years) "+ap" which is supposed to report the average point
>> position, i.e. include this option when doing +qc and the
>> lines that Steven pointed out should have the mean position
>> (which is still a low-precision point position).  But, if
>> you just want some idea of the position ASAP, do a +qc as
>> Steven suggested but also include "+pos", which should
>> terminate teqc and report a low-precision point position (same
>> format as below) for the antenna as soon as one is determined.
>>
>> To summarize:
>>
>> +qc -nav RINEX_NAV      : qc with last point position
>> +qc -nav RINEX_NAV +ap  : qc with average (mean) point position
>> +qc -nav RINEX_NAV +pos : first point position & terminate
>>
>> hth,
>> --lou
>>
>> Mullins, Steven wrote:
>>
>>> Michael,
>>>
>>> A standard TEQC summary contains the following lines:
>>>
>>>   antenna WGS 84 (xyz)  : 644013.2777 -5069344.4809 3804951.2706 (m)
>>>   antenna WGS 84 (geo)  : N  36 deg 51' 20.62"  W  82 deg 45' 35.59"
>>>   antenna WGS 84 (geo)  :   36.855728 deg   277.240114 deg
>>>           WGS 84 height : 595.1376 m
>>> |qc - header| position  : 36 m
>>>
>>> just run TEQC +qc and give a nav and obs file.
>>>
>>> Steve
>>>
>>> -----Original Message-----
>>> From: teqc-bounces at ls.unavco.org [mailto:teqc-bounces at ls.unavco.org]On
>>> Behalf Of Michael Scharber
>>> Sent: Wednesday, August 17, 2005 2:36 AM
>>> To: teqc at unavco.org
>>> Subject: [teqc] Single avg position (cart or geo) as output?
>>>
>>>
>>> Hi There,
>>>
>>> Can someone point me to, or show me, how one can use teqc to produce 
>>> a simple mean position (cartesian or geographic) from a single input 
>>> raw or RINEX GPS data file.....based on the data, of course, not 
>>> header information.  Position can be low precision - I don't care.
>>>
>>> Any advice would be greatly appreciated.
>>>
>>> Thanks,
>>>
>>> Michael
>>>
>>> ps. By "produce" I mean someone spat out to stderr or stdout that can 
>>> be captured by another program.
>>>
>>> *******************************************************
>>>            Michael Scharber
>>>      Scripps Institution of Oceanography
>>>      Institute of Geophysics and Planetary Physics
>>>      8785 Biological Grade
>>>      IGPP Room 4212
>>>      La Jolla, CA 92037
>>>
>>>          mscharber at gpsmail.ucsd.edu
>>>      (858)534-1750
>>> *******************************************************
>>
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