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SAE J2735-Draft-Rev28 [issued: 11-10-08]
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47 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
6. Data Frames
DSRC data frames for this volume shall consist of the following data frames. Each data frame shall be
further divided into specific entries and elements as defined in this clause. Typically, these entries are
made up of content internal to this document (made up of entries that are either atomic or complex) and
content external to this document (from other functional areas and companion volumes).
Definitions for these messages are presented in the following subclauses. The ASN is presented in a
section called "ASN.1 Representation," formerly called "Format." In a similar manner, the equivalent
XML expression is presented in a section called "XML Representation" which follows the translation rule
set cited in Clause Two.
Regarding equivalent entries to be placed into a data registry. The mapping between data elements and
analogous meta data entries have been explained in other ITS stds. In addition, some meta information is
constant in this entire standard and need not be repeated with each entry here. These include the sponsor
and steward of the entries [SAE], the registration status [registered once the standard is adopted] and the
revision date [the date of the standards adoption]. The class name is always ITS.
The productions of ASN.1 which follow shall be considered normative in nature. While the majority of the
normative content is reflected in the actual syntax of the ASN.1 some entries also have additional
statements in the ASN.1 comments which shall be considered to be normative as well. In addition, the
commentary provided with each entry may also provide additional normative restrictions on the proper use
of the entry which shall be followed. The XML productions follow directly from the ASN.1 specifications
and the same rules shall be applied.
6.1 Data Element: DF_AccelerationSet4Way
Use: A set of acceleration values in 3 orthogonal directions of the vehicle and with yaw rotation rate.
Expressed as an octet set
ASN.1 Representation:
AccelerationSet4Way ::= OCTET STRING (SIZE(4))
-- composed of the following:
-- SEQUENCE {
-- long Acceleration, -x- Along the Vehicle Longitudinal axis
-- lat Acceleration, -x- Along the Vehicle Lateral axis
-- vert VerticalAcceleration, -x- Along the Vehicle Vertical axis
-- yaw YawRate
-- }
XML Representation:
<xs:complexType name="AccelerationSet4Way" >
<xs:simpleContent>
<xs:annotation>
<xs:documentation>
composed of the following:
SEQUENCE {
long Acceleration, -x- Along the Vehicle Longitudinal axis
lat Acceleration, -x- Along the Vehicle Lateral axis
vert VerticalAcceleration, -x- Along the Vehicle Vertical axis
yaw YawRate
}
</xs:documentation>
</xs:annotation>
<xs:extension base="AccelerationSet4Way-string" >
<xs:attribute name="EncodingType" use="required">
<xs:simpleType>
<xs:restriction base="xs:NMTOKEN">