5.3. SBF2
I
SMR PROGRAM
should not be computed for SBAS satellites (calibration value set to ’NA’).
For
all satellites not addressed in the calibration file, the TEC calibration value
is assumed to be zero.
Corrected TEC values are obtained by subtracting the TEC calibration value
from the raw TEC.
The ISMR file contains corrected values.
5.3.1 ISMR Record Details
Time Tag
The
fi
rst two columns contain the week number and time-of-week. The time scale is GPS
time, even for non-GPS satellite records.
Supported Satellites
I
SMR records are generated every minute for all satellites tracked by the receiver.
The SV
I
D column identi
fi
es the satellite and the di
ff
erent constellations are assigned their
own range of values. For example, SV
I
D values in the range 1-37 refer to GPS satellites. You
can
fi
nd the full list of satellite constellation SV
I
D ranges in the
‘
SBF Outline
’
section of the
‘
PolaRx5S Reference Guide
’
.
Supported Signals
For each satellite, the
I
SMR
fi
le contains iono indices (S4, Phi
xx
, ...) for up to three signals, as
listed in the table below. The signals in italic can be selected with the
-s
option of
sfb2ismr
.
Satellite system
Signal 1
Signal 2
Signal 3
GPS
L1CA
L2C
L5
GLO
L1CA
L2CA
GAL
E1
E5a
E5b
(E6, E5)
BDS
B1
I
B2
I
(B2a)
B3
I
QZSS
L1CA
L2C
L5
SBAS
L1CA
L5
I
RNSS
L5
Number of Columns
By default, the
I
SMR
fi
le contains 62 columns, i.e. 62 values for each satellite every minute.
I
t is possible to specify the number of columns to be included in the
I
SMR
fi
le by using the
-n
option of
sfb2ismr
. For example, a user only interested in the satellite azimuth and
elevation (columns 5 and 6) could use the option
-n6
to skip all columns after the 6th one.
56
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