Required Parameter list (last updated 2012/03/07) - RAL

Name in Spec
Needed if
← not
available
Parameter
Name
Needed for
Real Time
Needed for
Current C
Code
Minimum
Sampling
Frequency
(Hz)
Minimum
Precision
UTC
UTC date and TBD N 8 0.125 sec
time
ACTYPE
Aircraft type Y Y 1 N/A
(b757-200)
CGA
Vertical N N 8 0.003 g
Acceleration
Mass
Current N N 8 2 100 lbs
Weight
TAS True Airspeed Y Y 8 0.07 knots
↩→ ALT Barometric Y Y 8 2 1 ft
Altitude
↩→ CAS Calibrated Y N 8 0.07 knots
Airspeed
↩→ SAT Static Air Y N 8 TBD
Temperature
AP
Auto-pilot N N 1 NA
(on/off)
AOAB
Body-axis Y N 8 0.05 deg
Angle of
Attack
↩→ AOA Angle of Y Y 8 0.05 deg
Attack 1& 2
↩→ PTHR Pitch Rate Y Y 8 0.02
deg/sec
↩→ FLAP Flap Angle Y Y 8 2 1 deg
PTCH Pitch Y Y 8 0.02 deg
ROLL Roll Y Y 8 0.02 deg
IVV
Inertial Y Y 8 1 ft/min
Vertical
Velocity
LAT Latitude N N 1 0.0002 deg
LON Longitude N N 1 0.0002 deg
Wind Speed Wind Speed N N 1 1 knot
Wind Direction
Wind
Direction
N N 1 1 deg
Table 1: Parameters needed for in situ turbulence algorithm. Note that if higher sampling frequencies
or smaller precisions are available, better turbulence EDR measurements can be
obtained. In general, the recommended sampling frequency range is between 8 and 20 Hz, and
the precision should be as small as possible. The current C code requires 8 Hz. Downsampling is
OK.
1 Not currently a direct input but some of the initialization parameters are based on the a/c type.
2 Upsampling is OK.
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