2 ms·
They can detect stationary objects, yes. But there's so much clutter from things like overpasses, road signs, and other objects that confuse the radar, that for
by redox99 2y ago
They can detect stationary objects, yes. But there's so much clutter from things like overpasses, road signs, and other objects that confuse the radar, that for things like adaptive cruise control, stationary objects are often intentionally filtered out or assigned much lower priority. So you detect moving objects (which stand out because of doppler shift).
- y1n0 2y agoWell, if we're talking about radar in a moving car, it's the other vehicles moving at the same speed that appear stationary. Non-moving vehicles are seen as approaching you at whatever speed you are moving at. Along with all the other things you mentioned. So they all have doppler shift but the "stationary" things approaching your car at your speed actually have much higher shift than the traffic around you.
- porphyra 2y agoYea, and they are designed to filter out actually stationary things by ignoring anything that's coming at you at the same speed as the current car speed (from measuring wheel rotation).