This document contains a high-level overview of the data_trk223 data collection.

Data Set Overview
===============================================================================

This collection consists of Ionosphere and Troposphere Calibration files received from the 
Deep Space Network (DSN) during the course of the Double Asteroid Redirection Test (DART)
mission. 

Data
===============================================================================
The trk223 data products are stored as 7-bit ASCII text. Additional information on the 
data products is provided by the document with PDS4 LID:
urn:nasa:pds:radiosci.documentation:dsn.trk-2-23:2008-03-05

The trk223 data products have the following naming convention:
dart_rs_yyyy_ddd_xxx_##.<extension>

where:
dart_rs : Hardcoded string; "dart" refers to the DART mission, "rs" is radio science
yyyy    : four digit year of first record in the data
ddd     : three digit day of year of first record in the data
xxx     : three character string: "dop" indicates it is doppler and range data, 
          "vlb" indicates it is delta-differenced one-way ranging data
##      : two digit version number
<extension>: "csp" for the ASCII file, "xml" for the PDS4 XML label