igs snx周解文件格式

* An end date of 00:000:00000 represents "up to now"
MANDATORY for all techniques, contains station codes, DOMES #, descriptions,
approx. positions, etc.
-SITE/ID
+SITE/DATA
OPTIONAL, contains information on source solution for each station.
may be useful in particular for combined solutions. For individual AC
submission may be unnecessary repetitive
-SITE/DATA
+SOLUTION/ESTIMATE
MANDATORY, contains complete solutions for all parameters including standard
deviations, station id's, indexes, epochs, etc
-SOLUTION/ESTIMATE
+SOLUTION/MATRIX_ESTIMATE (L CORR)
MANDATORY, contains triangular matrix, indexed w.r.t. to the estimate block.
L CORR (lower triangular correlation matrix is recommended for IGS, but other
forms are also acceptable.)
-SOLUTION/MATRIX_ESTIMATE (L CORR)
10 =< ratio S = 2 (loose or unconstr.)
* SINEX Units
* XPO mas (milli-arc seconds) pole x
* YPO mas (milli-arc seconds) y
* XPOR ma/s (milli-arc seconds/s) pole x rate
* YPOR ma/s (milli-arc seconds/s) y rate
* UT ms (milli-seconds) UT1-UTC
* LOD ms (milli-seconds) Length of day
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