ProNav Norway – a
Company
page 47
Rev.1
10.02.2020
Time Constants
,
Continued
Pitch
Use the $JATT,PTAU command to adjust the level of responsiveness of
the pitch measurement provided in the $PSAT,HPR message. The default
value of this constant is 0.5 seconds of smoothing.
Note:
Increasing the time constant increases the level of pitch smoothing
and increases lag.
Rate-of-Turn
(ROT)
Use the $JATT,HRTAU command to adjust the level of responsiveness of
the ROT measurement provided in the $GPROT message. The default
value of this constant is 2.0 seconds of smoothing.
Note:
Increasing the time constant increases the level of ROT smoothing.
Course-Over-
Ground (COG)
Use the $JATT,COGTAU command to adjust the level of responsiveness of
the COG measurement provided in the $GPVTG message. The default
value of this constant is 0.0 seconds of smoothing.
Note:
Increasing the time constant increases the level of COG smoothing.
COG is computed using only the primary GNSS antenna and its accuracy
depends upon the speed of the vessel (noise is proportional to 1/speed).
This value is invalid when the vessel is stationary, as tiny movements due
to calculation inaccuracies are not representative of a vessel’s
movement.
Speed
Use the $JATT,SPDTAU command to adjust the level of responsiveness of
the speed measurement provided in the $GPVTG message. The default
value of this parameter is 0.0 seconds of smoothing.
Note:
Increasing the time constant increases the level of speed
measurement smoothing.
Chapter 5: Operating the V200s
Overview
