ProNav Norway – a
Company
page 44
Rev.2
10.02.2020
Time Constants
,
Continued
Pitch
Use either MSGID 0x003C (NMEA 2000) or the $JATT,PTAU command
(using the PocketMax Terminal window) to adjust the level of
responsiveness of the pitch measurement. 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 either MSGID 0x0029 (NMEA 2000) or the $JATT,HRTAU command
(using the PocketMax Terminal window) to adjust the level of
responsiveness of the ROT measurement. 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 either MSGID 0x002A (NMEA 2000) or the $JATT,COGTAU command
(using the PocketMax Terminal window) to adjust the level of
responsiveness of the COG measurement. 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 (using the PocketMax Terminal
window) to adjust the level of responsiveness of the speed measurement
provided. The default value of this parameter is 0.0 seconds of
smoothing.
Note:
Increasing the time constant increases the level of speed
measurement smoothing.
