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SAE J2735-Draft-Rev28 [issued: 11-10-08]
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182 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
7.119 Data Element: DE_SpecialSignalState
Use: A date element indicating the current signal state of a particular known special lane type (such as a
train). Used in the the SPAT frame. The data element is a 8-bit encoded string, allowing multiple values to
be indicated. Note: is there ever a need for this?
ASN.1 Representation:
SpecialSignalState ::= ENUMERATED {
unknown (0),
notInUse (1), -- (B00000001) default state, empty, not in use
arriving (2), -- (B00000010) track-lane about to be occupied
present (3), -- (B00000100) track-lane is occupied with vehicle
departing (4), -- (B00001000) track-lane about to be empty
...
} -- one byte
XML Representation:
<xs:simpleType name="SpecialSignalState" >
<xs:annotation>
<xs:appinfo>
unknown (0)
notInUse (1) -- (B00000001) default state ,
arriving (2) -- (B00000010) track-lane about to be occupied
present (3) -- (B00000100) track-lane is occupied with vehicle
departing (4) -- (B00001000) track-lane about to be empty
</xs:appinfo>
<xs:documentation>
one byte
</xs:documentation>
</xs:annotation>
<xs:union>
<xs:simpleType>
<xs:restriction base="xs:unsignedInt">
<xs:minInclusive value="0"/>
<xs:maxInclusive value="4"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="unknown"/>
<xs:enumeration value="notInUse"/>
<xs:enumeration value="arriving"/>
<xs:enumeration value="present"/>
<xs:enumeration value="departing"/>
</xs:restriction>
</xs:simpleType >
</xs:union>
</xs:simpleType>
Used By: This entry is used directly by one other data structure in this standard, a DF called
DF_MovementState <ASN> <XML>. In addition, this item may be used by data structures in other
ITS standards.
7.120 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