NavCom Sapphire Rev.J - Manual (Page 86)

Sapphire Technical Reference Manual Rev. J
86
1.29 CONFIGGFA (ASCII)
SF-3050 Sapphire SF-3040
This command is used to change those parameters used in NMEA GFA message: K
H
, K
V
,
Selected Accuracy Level, HAL. This is a User Command; it can be included in a user’s profile.
Command: [CONFIGGFA] float(K
H
), float(K
V
), float(HAL for), float(Selected Accuracy Level)
Parameter Definition
K
H
Horizontal Protection Level; default = 4.0
K
V
Vertical Protection Level; default = 3.5
HAL Horizontal Alert Level; default = 10
Default: [CONFIGGFA]4.0,3.5,10
The following algorithm applies:
HPL = K
H_NPA
* d
major
HPL = K
H_PA
* d
major
VPL = K
V
* d
U
Where d
major
is the error uncertainty along the semimajor axis of the error ellipse, d
U
is the error
uncertainty along the vertical axis.
.
1.30 Reserved