CONTENTS

Annex 1  Procedures for TWSTFT
 1     Introduction
 2     Non-reciprocity due to satellite equipment delays
 3     Sagnac-effect correction
 4     Non-reciprocity effects due to satellite movement in an earth fixed frame
 5     Ionospheric correction
 6     Tropospheric correction
 7     Earth station delay measurement
 8     Data processing
 9     Determination of accuracy and stability of the result
10     Performance characteristics of the earth station
Annex 2  Information on the data format for data exchange
 1     Introduction
 2     Required information
        2.1     Station identification and assigned characters, codes and offset-frequencies
        2.2     Session parameters
        2.3     Local earth station(k) parameters
 3     Data format
        3.1     General
        3.2     Report of the individual 1 s measurements
                  3.2.1     Type 1 – Individual measurements
                  3.2.2     Type 2 – Combined measurements
        3.3     File format reporting results of a quadratic fit
                  3.3.1     General remarks
                  3.3.2     File name
                  3.3.3     Header
                  3.3.4     Data line
                  3.3.5     Computation of clock differences
                  3.3.6     Examples
Appendix 1  to Annex 2
 1     Data line
 1     Data files
 2     Computation of clock differences
 3     Identification and description of satellite links
 4     Identification and description of calibrations performed
Appendix 3  to Annex 2
 1     Data line
Appendix 4  to Annex 2
Examples
 1     Data files
 2     Computation of clock differences
 3     Identification and description of satellite links
 4     Identification and description of calibrations performed