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SAE J2735-Draft-Rev28 [issued: 11-10-08]
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163 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
XML Representation:
<xs:complexType name="PositionalAccuracy" >
<xs:simpleContent>
<xs:annotation>
<xs:documentation>
And the bytes defined as folllows
Byte 1: semi-major accuracy at one standard dev
(signed range 0-12.7 meter. 0xFF=any value equal
or greater than 12.7 meter)
Byte 2: semi-minor accuracy at one standard dev
(signed range 0-12.7 meter. 0xFF=any value equal
or greater than 12.7 meter)
Bytes 3-4: orientation of semi-major axis
relative to true north (0-360 degree)
(In NMEA GPGST)
</xs:documentation>
</xs:annotation>
<xs:extension base="PositionalAccuracy-string" >
<xs:attribute name="EncodingType" use="required">
<xs:simpleType>
<xs:restriction base="xs:NMTOKEN">
<xs:enumeration value="base64Binary"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:simpleType name="PositionalAccuracy-string">
<xs:restriction base="xs:base64Binary">
<xs:length value="6"/>
</xs:restriction>
</xs:simpleType >
Used By: This entry is directly used by the following 4 other data structures in this standard (record type,
descriptive name, ASN.1, and XML name (if present) of each):
DF
<XML>, and
DF
<XML>, and
DF
<XML>, and
MSG
In addition, this item may be used by data structures in other ITS standards.
7.102 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