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Logs
5.1.4
ISMRAWTEC Raw TEC measurements
This log outputs 1 second TEC measurements for all valid frequency combinations. TEC is a measure
of the number of electrons along the path from the satellite and is reported in TEC Units (1 TECU =
16
10
electrons/m
general TEC equation for signal combinations with L1 as the primary frequency is:
Coef
TEC
x
where:
K
Coef
meter TEC
1
where:
2
(f
/f
)
, where f
=
L1
x
PR
is the secondary signal pseudo range in metres
Lx
PR
is the primary signal pseudo range in metres
L1
K
= (1/0.163) TECU/metre at L1
meter/TEC
There are biases in the TEC measurements that are automatically removed by the receiver if properly
calibrated:
•
Satellite code phase bias. See SETDIFFCODEBIASES command
•
Receiver RF bias. See ISMCALIBRATE and ISMTECCALIBRATION commands
ΔTEC is based upon carrier phase measurements differences between frequencies. For an ionospheric
delay measured in L1 carrier cycles, the total electron content becomes:
ΔTEC = (1.1723 ΔPR
over the 1-second interval, where
ΔPR
= 1.54573 (ΔADR
L1,carrier
The TEC measurements contained in this log are the raw, unsmoothed values.
Structure:
Recommended Input:
GPStation-6 User Manual Rev 2
2
). The number is proportional to the ionospheric delay between frequencies. The
PR
- PR
x
Lx
L1)
/
TECU meter
is the L1 frequency and f
L1
) TECU
L1,carrier
– ΔADR
L1
LOG ISMRAWTECB ONNEW
is the frequency of the secondary signal
x
) cycles
LX
Message ID: 1390
Log Type: Asynch
64
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