----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
GPSSHD
----+----0----+----0----+----0----+----0----+----0----+----0----+----0----+----0
COLUMNS FORMAT DESCRIPTION DEFAULT VALUE & UNITS
1-6 A6 GPSSHD - This option will instruct
GEODYN to produce yaw polynomial input for
GPS runs if this is not available. The
computation are being done in GEODYN
according to the Journal of Geodesy Paper
by Bar-Sever.
The GPSSHD option will turn any GPS data
reduction run into an ORBGEN run automa-
tically, regardless of what other cards
are present.
Yaw polynomials will be computed and output
on unit 48 of GEODYN IIE, in the form of
YAWPOL group cards. These YAWPOL group cards
may be then included in the global part of
the setup for data reduction with the
appropriate yaw modeling. NOTE [1]
25-44 D20.5 12 hrs + endarc time YYMMDDHHMMSS
45-59 D15.3 Cutoff angle that helps save some computation deg 20
NOTE [2]
NOTE [1]: The end of the GPSSHD group is denoted by the presence
of the SHDEND card. In between the GPSSHD and the SHDEND
option cards we enter the required YAWRAT cards with yaw
rate and yaw rate rate information.
NOTE [2]: GPS satellites are not completely shadowed, unless the beta
angle of the orbit plane is about 15o (in absolute value)
or less. In a GPSSHD run, GEODYN will compute the beta angle
for each GPS satellite at EPOCH. If the absolute of the
beta angle is greater than the cutoff (20o or the input
on columns 45-59), for a particular GPS satellite at epoch,
then that satellite will be excluded from all further
consideration in the GPSSHD run.
IF CARD OMITTED:
DEC 1998
9812.0
GLOBAL SET