How does radar detect distance and speed?

The position of the video voltage in the domain of measured time following the transmitter pulse determines the distance of the target which reflected the energy . In radar, this time is called range.

Range is the distance from the radar site to the target measured along the line of sight . The factor of two in the equation comes from the observation that the radar pulse must travel to the target and back before detection, or twice the range.

Police are now using a laser technique to measure the speed of cars. This technique is called lidar. It uses the same principles with light that radar uses with radio waves. Sonar, radar and lidar all use echo and Doppler shift to do the same things – they measure the distance and speed of objects by their reflections .

Standard Form of Radar Range Equation Therefore, we can say that the range of the target is said to be maximum range when the received echo signal is having the power equal to that of minimum detectable signal. We will get the following equation, by substituting R=RMax and Pr=Smin in Equation 6 .