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Topcon PC-CDU - Page 73

Topcon PC-CDU
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65
Rate, you can check which period is actually being used by the receiver. This field cor-
responds to the receiver parameter /par/raw/curmsint.
The Position Update Rate group allows the user to determine the receive position update
period. In the Update Rate edit box, enter a value (in milliseconds) to specify the period. The
edit box is associated with the receiver parameter /par/pos/msint. With Current Update Rate,
one can check which period is actually being used by the receiver. This field is associated with the
receiver parameter /par/pos/curmsint.
When opening a file, regardless of whether this operation was done from the
Real-time logging window or the File Manager window, and the re-
cording interval has an incorrect value, PC-CDU launches a utility called
Output
Period Setup Wizard. For more information about the Wizard, see
Appendix B. Output Period Setup Wizard.
The Code smoothing interval edit box, which is associated with the receiver parameter
/par/raw/smi, specifies the interval over which pseudoranges are smoothed by using corresponding
carrier phase measurements. Here you can enter values between 0 and 900 seconds. Zero desig-
nates that carrier phase measurements will not be used for smoothing pseudo-ranges.
In the Doppler smoothing method edit box, the user sets the method used for smoothing
Doppler. There are three available methods:
0 - Receiver outputs raw (unsmoothed) Doppler. Instantaneous yet rather noisy Dop-
pler measurements.
1 - Doppler is computed using two consecutive carrier phase measurements,
Car-
Phase[i]
and
CarPhase[i-1]
, where
i
stands for the current epoch. Such Doppler meas-
urements are less noisy than in the first case.
2 - Doppler is computed using only three consecutive carrier phase measurements,
CarPhase[i]
,
CarPhase[i-1]
and
CarPhase[i-2]
, where
i
stands for the current epoch.
Doppler measurements obtained in this mode are least noisy.
The edit box is associated with the receiver parameter /par/raw/dopp/smi.
With Nominal Iono smoothing interval edit box, the user specifies the
nominal
iono-
spheric correction smoothing interval over which raw ionospheric corrections are smoothed (assum-
ing the receiver has been working for some time and has already obtained enough raw ionospheric
corrections to perform such smoothing)
. This integer parameter varies between 0…900 seconds.
The default value is 60. The edit box is associated with the receiver parameter /par/raw/iono/smi.
With the Minimum Iono smoothing interval edit box, the user specifies the
minimum
smoothing interval for the receiver to filter raw ionospheric corrections before they can be used in
position computation. This integer parameter ranges between 0 and 900 seconds. The default value
is 30 seconds. The edit box relates to the receiver parameter /par/raw/iono/minsmi.

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