[IGSMAIL-4855]: proposal for new GPS interface spec

[Jim Ray]

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IGS Electronic Mail      25 Feb 00:12:12 PST 2004      Message Number 4855
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Author: Jim Ray

GPS users should be aware that a proposal is being considered
to replace ICD-200 with a new Interface Specification IS-200
(Revision D).  One of the main features of the revision will be
a new "Improved Clock and Ephemeris" (ICE) navigation message
to be broadcast on the L2C signal.  The ICE format is intended
to overcome present limitations of the ICD-GPS-200 nav message
to allow the possibility for much more accurate broadcast
information in future.

The relevant documents are available at JPO's Public Interface
Control Working Group (ICWG) website at
<http://gps.losangeles.af.mil/engineering/icwg>.  The ICE message
is described in Section 30.  Comments can be submitted, using the
appropriate comment form, by 8 April 2004.  Since an ICWG meeting
will review the proposals on 24-25 March, comments filed before
that time can be considered at the meeting.