Honeywell SPZ-8000 - GPSSU Digital Accuracy and Resolution

. Continuous Tracking Mode -
In this mode, the signal processor circuits
performs continuous phase
lock loop (PLL) tracking and navigational data
collection.
. Automatic Frequency Control (AFC) Sequencing Mode -
In this mode, channel
one of the signal processor circuits performs
AFC tracking without
collecting navigational data. This
mode is used to perform measurements.
The ATP mode is used only during shop testing to verify that the GPSSU
performs within specifications.
The GPSSU enters the ATP mode when it
receives a test discrete input and specific ARINC test inputs. The ATP mode
consists of an alternating sequence of power-up BITE tests and satellite
signal tracking.
The accuracy and resolution of the output data provided by the GPSSU is
listed in Table 15-2.
PARAMETER
1. Present Position
2. Ground Speed
3. Track Angle
True****
4. Vertical Velocity
5. Altitude
6. N-S Velocity
7. E-W Velocity
8. Time***
SELECTIVE
AVAILABILITY
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
LIMITATION
HDOP = 1.72
HDOP = 1.72
HDOP = 1.72
HDOP = 1.72
VDOP= 2.2
HDOP = 1.72
VDOP = 2.2
HDOP = 1.72
HDOP = 1.72
HDOP = 1.72
AUTONOMOUS
25 meter
100 meter
1.8 Knots**
1.8 Knots**
0.30**
0.30**
100 ft/min
100 ft/min
138 ft
551 ft
1.8 Knots**
1.8 Knots**
1.8 Knots**
1.8 Knots**
350 ns
450 ns
HYBRID
25 meter
100 meter
0.3 Knots*
0.7 Knots*
0.07°
0.18”
20 ft/min
25 ft/min
138 ft
551 ft
0.2 Knots*
0.5 Knots*
0.2 Knots*
0.5 Knots*
350 ns
450 ns
* The resolution of the ARINC output is 0.125 knots.
** The track anqle, velocity and speed errors will qrow to Iarqer values
during aircr;ft maneuver;.
In a 2G
turn, this e;ror nominaily grows to
6.0 knots
for the velocities and 2.2” for track angle.
*** The time accuracy is internal. The time is associated with a hardware
“time mark.”
The system capability depends on the receiving equipment.
**** Based on 160 knot ground speed.
GPSSU Digital Accuracy and Resolution
Table 15-2
22-14-00
Page 198~206
Apr 15/93
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