RINEX扩展：IGS CLK格式与卫星时钟信息

               RINEX Extensions to Handle Clock Information
               ********************************************

                      Jim Ray, US Naval Observatory
                   Werner Gurtner, University of Berne  


   (Initial version, 27 August 1998; version 2.00 final update, 16 June 1999)
                    (Version 3.02, 02 September 2010)


-. SUMMARY OF CHANGES IN VERSION 3.00 and later

The changes introduced in version 3.00 are mostly to be consistent with
RINEX 3.00 and to recognize the use of other Global Navigation Satellite
Systems (GNSSs) besides the Global Positioning System (GPS):

  a. "RINEX VERSION / TYPE" header changed to 3.00 and to add satellite
     system designator.
  b. "PGM / RUN BY / DATE" header date format elaborated.
  c. "SYS / # / OBS TYPES" header added.
  d. Added Galileo and Satellite-Based Augmentation System (SBAS) satellite
     designators in Section 5.
  e. "TIME SYSTEM ID" header added.
  f. The satellite antenna phase center offset information has been moved
     from a mandatory comment to the "SYS / PCVS APPLIED" header and now
     includes the associated phase center variation information also.
     It is expected that an external file will be referenced.

  g. "SYS / DCBS APPLIED" header added.
  h. Capability of handling inter-system timing biases and new intra-lab
     biases (possibly as new types of CR data record) are under
     consideration but not yet adopted.
  i. In version 3.01 a few cases where "GPS time" was specified have been
     corrected to read "specified system time".
  j. In version 3.02 satellite codes for the QZSS ("Jnn") and COMPASS
     ("Cnn") systems as well as the QZSS system time designator ("QZS")
     have been added.


0. INTRODUCTION

Thus far, the IGS has produced clock results only for the GPS satellites
and these are tabulated and distributed at the 15-minute intervals used
in the sp3 orbit ephemerides files.  There is much interest in increasing
the satellite clock interval to 30 seconds (e.g., to overcome SA effects
on interpolation) and also in producing station clock results (at some
appropriate interval, probably 5 minutes).  In principle, the sp3 format
could continue to be used for both of these extensions, but it would be
wasteful considering that the vast majority of the file space is set
aside for orbit information.  Also, the variety of other clock
information that also needs to be exchanged does not lend itself to the
sp3 format.

Alternatively, the IGS could devise a new format specifically for
distributing clock information.  It does not appear that the timing
community already uses a standard data format that is well suited for the
IGS needs.