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SAE J2735-Draft-Rev15 [issued: 01-30-07]
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This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
</xs:sequence>
</xs:complexType>
Used by: This entry is used directly by one other data structure in this standard, a MSG called MSG_EmergencyVehicleAlert
Remarks: Updated to conform to current styles and DSRC needs in the this (3rd) revision of the ATIS standard.
Deployments should also consult SAE J2735 "DSRC Message Set" for several additional use cases dealing with
mobile and stationary public safety vehicles using this message. When used in other public safety messages,
additonal elements may be appended to form new message types.
8.9 Data Frame: DF_SpaceVector [ATIS]
Use: This data frame provides a concise summary of an object's position (X,Y,Z) and motion vector (heading and
rate of speed), as well as the positioning technology employed and relative accuracy expected. Typically, this
vector is applied to stationary items, such as the location of an event, or to a moving location where the relative
offset distance and the heading vector with respect to the listener is most important. If the position is not known,
values of zero would be used in X,Y,Z. If the heading or speed is not known, values of zero shall be used. Observe
that the 32-bit values for Lat-Long provides a least significant bit (a resolution) of approximately 4 inches in North
America.
ASN.1 Representation:
SpaceVector ::= SEQUENCE {
lat DSRC.Latitude, -- a 4 byte value
long DSRC.Longitude, -- a 4 byte value
heading Heading, -- a 1 byte value from geoids north
speed Speed, -- a 2 byte field in units
-- of 0.01 meters per second
vertical DSRC.Elevation, -- 3 byte field
-- as a relative measure of merit
-- from [SAE-J2313::Location-tech]
-- from [SAE-J2313::Location-quality]
-- above two items form one 8 bit field
}
-- this element fits in exactly 15 bytes
XML Representation:
<xs:complexType name="SpaceVector" >
<xs:annotation>
<xs:documentation>
this element fits in exactly 15 bytes
</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element name="lat" type="lrms:Latitude" />
<!-- a 4 byte value -->
<xs:element name="long" type="lrms:Longitude" />
<!-- a 4 byte value -->
<xs:element name="heading" type="Heading" />
<!-- a 1 byte value from geoids north -->
<xs:element name="speed" type="Speed" />
<!-- a 2 byte field in units
of 0.01 meters per second -->
<xs:element name="vertical" type="dsrc:Elevation" />
<!-- 3 byte field -->
<!-- how the position was obtained, acts
as a relative measure of merit
from [SAE-J2313::Location-tech] -->