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SAE J2735-Draft-Rev26 [issued: 09-18-08]
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160 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
Used By: This entry is directly used by the following 3 other data structures in this standard (record type,
descriptive name, ASN.1, and XML name (if present) of each):
DF
DF
MSG
In addition, this item may be used by data structures in other ITS standards.
7.104 Data Element: DE_PositionConfidence
Use: This DE is used to provide to listeners the confidence interval of the 95% confidence level for the
currently reported value of entries such as the DE_Position entries, taking into account the current
calibration and precision of the sensor(s) used to measure and/or calculate the value. It is used in the
horizontal plane. This data element is only to provide the listener with information on the limitations of the
sensing system; not to support any type of automatic error correction or to imply a guaranteed maximum
error. This data element should not be used for fault detection or diagnosis, but if a vehicle is able to detect
a fault, the confidence interval should be increased accordingly.
The frame of references and axis of rotation used shall be accordance with that defined in SAE
J670, Issued 1976-07 and its successors. Note the definitions provided in Figure 1 (Tire Axis
System) and Figure 2 (Directional Control Axis Systems).
ASN.1 Representation:
PositionConfidence ::= ENUMERATED {
notEquipped (0), -- B'0000 Not Equipped
a500m (1), -- B'0001 500m or about 5 * 10 ^ -3 decimal degrees
a200m (2), -- B'0010 200m or about 2 * 10 ^ -3 decimal degrees
a100m (3), -- B'0011 100m or about 1 * 10 ^ -3 decimal degrees
a50m (4), -- B'0100 50m or about 5 * 10 ^ -4 decimal degrees
a20m (5), -- B'0101 20m or about 2 * 10 ^ -4 decimal degrees
a10m (6), -- B'0110 10m or about 1 * 10 ^ -4 decimal degrees
a5m (7), -- B'0111 5m or about 5 * 10 ^ -5 decimal degrees
a2m (8), -- B'1000 2m or about 2 * 10 ^ -5 decimal degrees
a1m (9), -- B'1001 1m or about 1 * 10 ^ -5 decimal degrees
a50cm (10), -- B'1010 0.50m or about 5 * 10 ^ -6 decimal degrees
a20cm (11), -- B'1011 0.20m or about 2 * 10 ^ -6 decimal degrees
a10cm (12), -- B'1100 0.10m or about 1 * 10 ^ -6 decimal degrees
a5cm (13), -- B'1101 0.05m or about 5 * 10 ^ -7 decimal degrees
a2cm (14), -- B'1110 0.02m or about 2 * 10 ^ -7 decimal degrees
a1cm (15) -- B'1111 0.01m or about 1 * 10 ^ -7 decimal degrees
}
-- Encoded as a 4 bit value
XML Representation:
<xs:simpleType name="PositionConfidence" >
<xs:annotation>
<xs:appinfo>
notEquipped (0) -- B'0000 Not Equipped
a500m (1) -- B'0001 500m or about 5 * 10 ^ -3 decimal degrees
a200m (2) -- B'0010 200m or about 2 * 10 ^ -3 decimal degrees
a100m (3) -- B'0011 100m or about 1 * 10 ^ -3 decimal degrees
a50m (4) -- B'0100 50m or about 5 * 10 ^ -4 decimal degrees
a20m (5) -- B'0101 20m or about 2 * 10 ^ -4 decimal degrees
a10m (6) -- B'0110 10m or about 1 * 10 ^ -4 decimal degrees
a5m (7) -- B'0111 5m or about 5 * 10 ^ -5 decimal degrees
a2m (8) -- B'1000 2m or about 2 * 10 ^ -5 decimal degrees
a1m (9) -- B'1001 1m or about 1 * 10 ^ -5 decimal degrees
a50cm (10) -- B'1010 0.50m or about 5 * 10 ^ -6 decimal degrees
a20cm (11) -- B'1011 0.20m or about 2 * 10 ^ -6 decimal degrees
a10cm (12) -- B'1100 0.10m or about 1 * 10 ^ -6 decimal degrees
a5cm (13) -- B'1101 0.05m or about 5 * 10 ^ -7 decimal degrees
a2cm (14) -- B'1110 0.02m or about 2 * 10 ^ -7 decimal degrees
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