The RADAR block gives three outputs
- Detections
- Clustered Detections
- Tracks
The Detections only give you radial velocity. This is stored in the Measurement section of the bus.
The Tracks give you relative velocity of the objects. This is in the covariance matrix.
This function (Obtain updated track velocities and velocity covariance matrix - MATLAB getTrackVelocities (mathworks.com)) will calculate the velocity of each track.