MBIAS
MAY 1995
9505.0
ARC SET
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MBIAS 7063 517603901 0. 850731000000. 850831000000. 10.
----+----0----+----0----+----0----+----0----+----0----+----0----+----0----+----0
COLUMNS FORMAT DESCRIPTION DEFAULT VALUE & UNITS
1-6 A6 MBIAS - Requests application and/or
adjustment of measurement or station
timing bias.
7-14 I8 Station Number. 0
15-17 I3 Bias Type. See list of bias types after 0
this option description.
18-24 I7 Satellite ID. 0
25-44 D20.8 Value of the bias (a priori estimate 0.
if adjusted). Units are:
Length - M, Time - S, Angles - RAD
45-59 D15.3 Date and time at which the bias is to 0.
begin in form: YYMMDDHHMMSS.
60-72 D13.1 Date and time at which the bias is to 0.
end in form: YYMMDDHHMMSS.
73-80 D8.2 Standard deviation of the a priori 0.
bias in the same units as bias value.
If this value is greater than zero bias
will be adjusted.
UNITS: KM =Kilometers; M =Meters ; S =Seconds ; Kg =Kilograms
DEG=Degrees ; RAD=Radians ; AS =Arc seconds; MAS=Milli-arc seconds
NOTE [1]: Please also see EBIAS and PBIAS options.
NOTE [2]: If the measurement type is larger than 99 (3 digit) use
MBIASM card to specify it.
IF CARD OMITTED: Measurement biases are not applied. See also EBIAS and
PBIAS option.
GEODYN-II BIAS TYPES
The GEODYN-II bias types include all of the GEODYN-II measurement
types as well as other types which are independent from measurement type
or which are an extension of the simple measurement bias.
At present, the only bias types defined include simple constant
measurement biases and simple time biases independent of measurement type.
Other future bias types will include linearly varying measurement biases,
observation scale biases, tropospheric and ionospheric refraction scale
biases, station clock polynomials and satellite clock polynomials.
Bias type numbers are assigned as follows:
SATELLITE STATION
BIAS DESCRIPTION BIAS TYPE NUMBER DEPENDENT DEPENDENT UNITS
---------------- ---------------- --------- --------- -----
simple measurement biases measurement type yes or yes
measurement scale bias meas. type + 100 yes or yes
station clock bias 300 no yes sec
station clock linear drift 301 no yes sec/hour
2
station clock quadratic drift 302 no yes sec/hour
3
station clock cubic drift 303 no yes sec/hour
satellite clock bias 400 yes no sec
satellite clock linear drift 401 yes no sec/hour
2
satellite clock quadratic drift 402 yes no sec/hour
3
satellite clock cubic drift 403 yes no sec/hour
tropospheric refraction 500 no yes [NOTE 1]
scale bias
ionospheric refraction 600 no yes
scale bias
a: coefficient to TDRSS 700 [NOTE 3] yes no sec
1-way range-rate user
frequency correction 
f/Fref
Fref => Reference frequency
f => Difference between reference
frequency and user transmit
frequency
frequency correction can be
specified to a cubic:
f/Fref = a + b(t - to) + c(t - to)2 +d(t - to)3
t => Observation time
to => Epoch time defined
by the user [NOTE 2]
b: coefficient (to the linear 701 yes no
term)
c: coefficient (to the quadratic 702 yes no 1/sec
term)
d: coefficient (to the cubic 703 yes no 1/sec**2
term)
simple time biases 900 yes or yes
NOTE [1]: In order to apply a troposphere refraction scale bias the parameter
must be adjusted.
NOTE [2]: Clock polynomials (400) and TDRSS one-way correction (700)
cannot be handled by GEODYN simultaneously.
NOTE [3]: Bias type is measurement type dependent. To specify the measurement
type for MBIAS 700 the user should include an MBIASM card immediatlly
following the MBIAS 700 card.
Patrick Dahiroc
1998-09-10