1       Definition

Data produced by a “time-of-flight”-based active sensor called Radio Detection and Ranging (RADAR) able to measure the distance and speed of objects from the time it takes for a signal emitted by the sensor to hit an object and be reflected.

RADAR operates in the mm range. It can detect vehicles (CAVs and trucks) because they typically reflect radar signals while smaller and less reflecting objects, e.g., pedestrians and motorcycles have a poor reflectance. In a busy environment, the reflections of big vehicles can overcome a motorcycle’s causing missed detection of important objects (e.g., a human next to a vehicle), while a can may produce an image out of proportion to its size.

2       Functional Requirements

The main features of Radar Data are:

  1. Ability to detect objects and measure speed @ ≤ 250 m (long range radar in the 76-77 GHz).
  2. Ability to provide a resolution of ~25-cm radial and ~1.5 degrees angular.
  3. Suitability to measure distance (short range radar in the 25 GHz band).

3       Syntax



4       Semantics

Label Size Description
Header N1 Bytes
·         Standard 9 Bytes The characters “CAV-IRA-V”
·         Version N2 Bytes Major version – 1 or 2 Bytes
·         Dot-separator 1 Byte The character “.”
·         Subversion N3 Bytes Minor version – 1 or 2 Bytes.
InputRADARID N5 Bytes Identifier of RADAR Sensor.
InputRADARTimeSpaceAttributes N6 Bytes Total duration of Input RADAR Data.
InputRADARData N7 Bytes
·         InputRADARFormatID N8 Bytes Format ID of Input RADAR Data.
·         InputRADARDataLength N9 Bytes Data Length of Input RADAR Data in Bytes.
·         InputRADARDataURI N10 Bytes Location of Input RADAR Data.
AudioObjectAttributes[] N11 Bytes
·         InputRADARAttributeID N12 Bytes ID of Attribute of Input RADAR Data
·         RADARAttributeFormatID N13 Bytes ID of Attribute Format of Input Audio Data
·         InputRADARAttributeLength N14 Bytes Number of Bytes in Input RADAR Data
·         InputRADARAttributeDataURI N15 Bytes URI of Data of Input RADAR Data

5       Data Formats

Input RADAR requires:

  1. RADAR Format.
  2. RADAR Attribute Format.

6       To Respondents

Respondents are invited to:

  1. Identify functional requirements of the output data produced by RADAR sensors for indoor/outdoor (cabin) use.
  2. Propose Data Formats and Attributes for use in the future Technical Specification: Data Types, Formats, and Attributes (MPAI-TFA).