Lidar and Radar

Radar Radar stands for radio detection and ranging .Radar uses radio waves.you can find them in sysytem like adaptive cruise control,blind spot warning,collision warning and collision avoidance.Even though radar is a nature technology,it still gets improved all the time to make it even more powerful.while other sensors measure velocity.radar uses something called dopler effect to measure speed directly.The dopler effect measure the change in frequency of the radar waves based on whether the object is moving from you or toward you.This is kind of how a fire engine siren will differently depending on whether the fire engine is moving away from you or toward you.The dopler effect is important for sensor fusion because it give us the velocity as an independent measure parameter and it makes the fusion algorithm coverage much faster.Radar can also be used for localization by generating radar maps of the environment because Radar waves bounce the hard surface,they can provide the object