Date: Fri, 25 Aug 2006 10:54:30 -0400 From: Steve Hilla Subject: [IGSMAIL-5399]: Request for Comments regarding proposed change to SP3-c documentation To: igsmail@igscb.jpl.nasa.gov Message-id: <44EF0F26.7090005@noaa.gov> Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7bit User-Agent: Thunderbird 1.5.0.5 (Windows/20060719) Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 25 Aug 07:54:31 PDT 2006 Message Number 5399 ****************************************************************************** Author: Steve Hilla To all IGS orbit Analysis Centers, and others within the IGS community using the SP3-c orbit format: I am e-mailing you to request comments regarding a proposed change to the documentation describing the SP3-c orbit format. Recently, it was proposed to add an additional Time System Indicator code to represent Galileo System Time. Note that the proposed Rinex 3.00 format already has the time system identifiers: GPS to identify GPS time, GLO to identify the GLONASS UTC time system, and GAL to identify Galileo system time (which should be very close to TAI). Currently, the SP3-c documentation only allows for codes GPS and UTC. So, it is proposed to modify the SP3-c specifications to now offer the following five choices for the Time System Indicator code used on line thirteen of the header: GPS to identify GPS time, GLO to identify the GLONASS UTC time system, GAL to identify Galileo system time, TAI to identify International Atomic Time, and UTC to identify Coordinated Universal Time. This is a minor change which does not affect the actual format of the data fields, so the name of the format will remain SP3-c. If anyone has any comments regarding these five codes, please e-mail them to me sometime before September 11th, 2006. Thanks and best regards, Steve Hilla Steve Hilla N/NGS6 National Geodetic Survey, NOAA 1315 East-West Highway, SSMC-3 Silver Spring, Marylnad 20910 Tel. 301-713-2851 Fax. 301-713-4475 Steve.Hilla@noaa.gov