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SAE J2735-Draft-Rev26 [issued: 09-18-08]
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99 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
Longitudinal acceleration is the acceleration along the X axis or the vehicle's direction of travel in parallel
with a front to rear centerline. Negative values indicate braking action.
Lateral acceleration is the acceleration along the Y axis or perpendicular to the vehicle's direction of travel
in parallel with a left-to right centerline. Negative values indicate left turning action and positive values
indicate right-turning action.
ASN.1 Representation:
Acceleration ::= INTEGER (-2000..2000) -- LSB units are 0.01 m/s^2
XML Representation:
<xs:simpleType name="Acceleration" >
<xs:annotation>
<xs:documentation>
LSB units are 0.01 m/s^2
</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:short">
<xs:minInclusive value="-2000"/>
<xs:maxInclusive value="2000"/>
</xs:restriction>
</xs:simpleType>
Used By: This entry is used directly by one other data structure in this standard, a DF called
DF_VehicleStatus <ASN> <XML>. In addition, this item may be used by data structures in other ITS
standards.
7.10 Data Element: DE_AccelerationConfidence
Use: This DE is used to provide to listeners the confidence interval of the 95% confidence level for the
currently reported value of DE_Acceleration, 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:
AccelerationConfidence ::= ENUMERATED {
notEquipped (0), -- B'000 Not Equipped
accl-100-00 (1), -- B'001 100 meters / second squared
accl-010-00 (2), -- B'010 10 meters / second squared
accl-005-00 (3), -- B'011 5 meters / second squared
accl-001-00 (4), -- B'100 1 meters / second squared
accl-000-10 (5), -- B'101 0.1 meters / second squared
accl-000-05 (6), -- B'110 0.05 meters / second squared
accl-000-01 (7) -- B'111 0.01 meters / second squared
}
-- Encoded as a 3 bit value
XML Representation:
<xs:simpleType name="AccelerationConfidence" >
<xs:annotation>
<xs:appinfo>
notEquipped (0) -- B'000 Not Equipped
accl 100 00 (1) -- B'001 100 meters / second squared
accl 010 00 (2) -- B'010 10 meters / second squared
accl 005 00 (3) -- B'011 5 meters / second squared
accl 001 00 (4) -- B'100 1 meters / second squared
accl 000 10 (5) -- B'101 0.1 meters / second squared
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