From gordon@a-train.ngs.noaa.gov Wed Jun 30 16:30:19 EDT 1999
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Date: Wed, 30 Jun 1999 16:34:08 -0400 (EDT)
From: Gordon Adams <gordon@a-train.ngs.noaa.gov>
Reply-To: Gordon Adams <gordon@a-train.ngs.noaa.gov>
Subject: Re: FAQ for Interpolation on UFCORS Page
To: don@ngs.noaa.gov
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Date: Fri, 14 May 1999 11:25:45 -0400 (EDT)
From: Gordon Adams <gordon@a-train.ngs.noaa.gov>
Subject: Re: FAQ for Interpolation on UFCORS Page
To: rich@ngs.noaa.gov, nweston@ngs.noaa.gov, fmowry@ngs.noaa.gov, 
ramas@ngs.noaa.gov, don@ngs.noaa.gov
Cc: gordon@ngs.noaa.gov
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This is from Dennis.  I am not sure how to phrase a question for it.

Gordon 


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X-Sender: dennis@dancer.ngs.noaa.gov
Date: Fri, 14 May 1999 07:16:08 -0400
To: Gordon Adams <gordon@a-train.ngs.noaa.gov>
From: Dennis Milbert <dennis@ngs.noaa.gov>
Subject: Re: FAQ for Interpolation on UFCORS Page
Cc: dennis@ngs.noaa.gov
Mime-Version: 1.0

Dear Gordon:

We can go with this:


The National Geodetic Survey (NGS) provides GPS observation data at certain 
sites with a 30 second sampling rate.  This rate may too slow for some 
applications.  When a non-default sampling rate is requested, NGS will use 
the 30-second data to generate a new RINEX-format file with interpolated 
GPS satellite observations at the user-selected rate.  New code range 
(pseudorange), Doppler, carrier phase, and receiver clock offsets 
(if available) are interpolated.  Error of interpolated code range data 
seldom exceeds 10 cm.  Due to the possibility of cycle slips, interpolated 
carrier phase must be considered experimental.

For more detailed discussion of the accuracy of interpolated data, the 
applicability of interpolated data to positioning, and the interpolation 
algorithm, please refer to the user documentation for the interpo program 
<hyper-text link here>


Dennis



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---------------------------------------------------------------------
Gordon W. Adams                                  301-713-3251 (voice)   
Software Therapist                               301-713-4176 (fax)
National Geodetic Survey: "We let you know where you're at."


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---------------------------------------------------------------------
Gordon W. Adams                                  301-713-3251 (voice)   
Software Therapist                               301-713-4176 (fax)
National Geodetic Survey: "We let you know where you are."