Minimum Aviation System Performance Standards for Aircraft ...

Table 3.2.9.6A: Lateral Axis GPS Antenna Offset Values
0 = left Values
Upper Bound of the
GPS Antenna Offset
Along Lateral (Pitch) Axis
Left or Right of Longitudinal (Roll) Axis
1 = right Bit 1 Bit 0 Direction (meters)
0 0 NO DATA
0
0
1
1
0
LEFT
2
4
1 1
6
0 0 0
1
0
1
1
0
RIGHT
2
4
1 1
6
Notes:
1. Left means toward the left wing tip moving from the longitudinal center line of the
aircraft.
2. Right means toward the right wing tip moving from the longitudinal center line of the
aircraft.
3. Maximum distance left or right of aircraft longitudinal (roll) axis is 6 meters or
19.685 feet. If the distance is greater than 6 meters, then the encoding should be set
to 6 meters.
4. The “No Data” case is indicated by encoding of “000” as above, while the “ZERO”
offset case is represented by encoding of “100” as above.
5. The accuracy requirement is assumed to be better than 2 meters, consistent with the
data resolution.
b. Longitudinal Axis GPS Antenna Offset:
The Longitudinal Axis GPS Antenna Offset shall (242AR3.112-J) be used to encode
the longitudinal distance of the GPS Antenna from the NOSE of the aircraft.
Encoding shall (242AR3.112-K) be established in accordance with Table 3.2.9.6B.
If the Antenna Offset is compensated by the Sensor to be the position of the ADS-B
participant’s ADS-B Position Reference Point (See §3.2.4.1), then the encoding is set
to binary “00001” in Table 3.2.9.6B.
© 20xx, RTCA, Inc.
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