System Description

System Description and Installation Manual for MXS ICD10004-01
© Sagetech Corporation 2018 Confidential Proprietary Export-Controlled Page 106 of 160
Operational Mode
The Longitudinal Axis GPS Antenna Offset field in byte OM1 is encoded as follows:
Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Upper Bound of GPS Antenna Offset Along Longitudinal Axis Aft From Aircraft
Noise
0
0
0
0
0
*
*
1
0
0
0
0
0
*
*
1
0
0
0
0
1
*
*
1
0
0
1
1
0
*
*
1
0
1
0
1
0
*
*
1
No Data
Position Offset Supplied by Sensor
2 meters
4 meters
6 meters
***
***
60 meters
SV Quality - NACp
Byte Offset
Byte Name Field Description
27
NP0
NP0 95% Horizontal Accuracy Bounds (EPU)
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C-0xFF
EPU ≥ 18.52 km (10 NM)
EPU < 18.52 km (10 NM)
EPU < 7.408 km (4 NM)
EPU < 3.704 km (2 NM)
EPU < 1852 m (1 NM)
EPU < 926 m (0.5 NM)
EPU < 555.6 m (0.3 NM)
EPU < 185.2 m (0.1 NM)
EPU < 92.6 m (0.05 NM)
EPU < 30 m
EPU < 10 m
EPU < 3 m
Reserved
SV Quality – NACp The NACp field reports the level of accuracy of the geometric position being reported. EPU is
defined as the radius of a circle that is centered on the ADS-B participant and indicates the probability of being
inside the circle is 95%.