ELi5:How radar sensors work in automotive driver assistance systems?
In: Engineering
I believe that it simply measures distance. It does that by sending a short pulse of radio waves out ahead of the car and then measures the time it takes for it to reflect back. The speed of the radio waves is known, so by measuring the time the distance can be calculated. If a pulse returns too quickly that means that the distance to some reflective object is too close and it applies the brakes.
There are other sensors involved, too. In order to keep the car in its lane, optical cameras are used to “see” and detect the painted lines that indicate lanes. This has to go through an optical recognition system to identify those lines. If the car drifts too close or over a line the system gently pulls the steering in the correct direction to prevent drifting out of your lane.
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