3 ms·
That’s not how it works in my limited understanding. Radars don’t just detect the positions of object, but also their relative speed. For this, they take advant
by adamlett 9y ago
That’s not how it works in my limited understanding. Radars don’t just detect the positions of object, but also their relative speed. For this, they take advantage of the Doppler effect. When a pulse gets reflected, its frequency rises if the object is moving towards the radar, and falls if it’s moving away.
- saalweachter 9y agoYou could be right, either in this case or other cases. I'm entirely inferring what autos are doing based on their failure case (not detecting stationary cars when the car in front of you swerves around them); that sounds a helluva lot like mistaking the new car for the old. Again, not saying it's a limitation of RADAR; it sounds like a deficiency in the way they're using it.
- hexane360 9y agoAlthough there's an inherent trade-off between detecting position and speed. Longer pulses give more accurate frequency/speed detection, while short pulses give more accurate time/position detection. This is the same phenomenon that underlies Heisenberg uncertainty.