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SAE J2735-Draft-Rev26 [issued: 09-18-08]
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177 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
7.122 Data Element: DE_SpeedConfidence
Use: This DE is used to provide to listeners the confidence interval of the 95% confidence level for the
currently reported value of DE_Speed, taking into account the current calibration and precision of the
sensor(s) used to measure and/or calculate the value. 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:
SpeedConfidence ::= ENUMERATED {
notEquipped (0), -- B'000 Not Equipped
prec100ms (1), -- B'001 100 meters / sec
prec10ms (2), -- B'010 10 meters / sec
prec5ms (3), -- B'011 5 meters / sec
prec1ms (4), -- B'100 1 meters / sec
prec0-1ms (5), -- B'101 0.1 meters / sec
prec0-05ms (6), -- B'110 0.05 meters / sec
prec0-01ms (7) -- B'111 0.01 meters / sec
}
-- Encoded as a 3 bit value
XML Representation:
<xs:simpleType name="SpeedConfidence" >
<xs:annotation>
<xs:appinfo>
notEquipped (0) -- B'000 Not Equipped
prec100ms (1) -- B'001 100 meters / sec
prec10ms (2) -- B'010 10 meters / sec
prec5ms (3) -- B'011 5 meters / sec
prec1ms (4) -- B'100 1 meters / sec
prec0 1ms (5) -- B'101 0.1 meters / sec
prec0 05ms (6) -- B'110 0.05 meters / sec
prec0 01ms (7) -- B'111 0.01 meters / sec
</xs:appinfo>
<xs:documentation>
Encoded as a 3 bit value
</xs:documentation>
</xs:annotation>
<xs:union>
<xs:simpleType>
<xs:restriction base="xs:unsignedInt">
<xs:minInclusive value="0"/>
<xs:maxInclusive value="7"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="notEquipped"/>
<xs:enumeration value="prec100ms"/>
<xs:enumeration value="prec10ms"/>
<xs:enumeration value="prec5ms"/>
<xs:enumeration value="prec1ms"/>
<xs:enumeration value="prec0 1ms"/>
<xs:enumeration value="prec0 05ms"/>
<xs:enumeration value="prec0 01ms"/>
</xs:restriction>
</xs:simpleType >
</xs:union>
</xs:simpleType>
Used By: This entry is directly used by the following 2 other data structures in this standard (record type,
descriptive name, ASN.1, and XML name (if present) of each):
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