Fixed Altitude Modes - ashtech DG16 Reference Manual

Dynamic
Description
Mode
7 Unlimited
8 Adaptive
Dynamic **
* Quasi-Static represents a static condition with some tolerance for slight movements within a
decimeter or two. An example would be an antenna on a handheld pole or on the back of a
person; obviously a person can try to be static but will inevitably move within a decimeter or
two. This is unlike "Static" mode where the antenna is placed on a tripod or any other statio-
nery structure with zero tolerance for actual movement.
*"Adaptive Dynamic adapts the filter dynamics settings to any of the modes 2 through 7 in real
time allowing the switch from one mode to the other based on the witnessed behavior. Use
one of the standard Adaptive filtering algorithms that monitor covariance behavior to deter-
mine dynamics model to use.
If you set the Dynamic mode to Static and enable the Kalman filter mode for the
navigation solution ($PASHS,KFP,ON), then the velocity values output by the
receiver are always zero for both ground speed and vertical velocity.
If you want to determine the appropriate model for your application, choose the Adaptive Dynamic
mode. If you select Mode 1 through 7, the DG16 will not accommodate the other dynamic modes.
Adaptive Dynamic mode can never be static; under good, open sky, static conditions, the Kalman
filter automatically changes to Quasi-Static mode.

Fixed Altitude Modes

Two modes define the altitude setting when the DG16 is in altitude hold mode.
The $PASHS,FIX set command can be used to select between these modes. See
"FIX: Fixed Altitude Mode" section on page 114 for more information.
• Fixed Altitude Mode 0
The most recent altitude is used. This is either the altitude entered by
using the $PASHS,ALT set command or the one computed when four or
more satellites are used in the position solution and the VDOP value is
below the VDOP mask, whichever is most recent.
• Fixed Altitude Mode 1
Only the last altitude entered through the command $PASHS,ALT is used
in the position fix solution.
40
Table 3.1. Dynamic Modes (Continued)
Maximum Maximum
Horizontal Vertical
Velocity (m/s) Velocity (m/s)
1000 1000
N/A N/A
DEFAULT SETTINGS
—
$PASHS,DYN Adaptive Dynamic (8)
DG14 and DG16 Board & Sensor Reference Manual
Maximum
Maximum Vertical
Horizontal
Acceleration (m/s
2
Acceleration (m/s )
100
N/A
2
)
100
N/A