I hadn’t realized it until just now, but yeah, it looks like vehicles with HW2.5 were not switched to Tesla Vision and therefore probably still have their radar enabled. Jealous!
teslamotorsclub.com
Yes, sorry, I should have said positional and not directional. It’s still early here.
Where that might be useful in a car is if it can tell that the “ground clutter” it’s seeing is directly ahead, and is getting closer quickly.
Thank you, I taught this during my younger days as a police officer. These factors are important for officers to understand when using moving RADAR so the reading is accurate - primary of which is to confirm the patrol car speed on the display matches that of the patrol car speedometer so that the target "closing speed" is calculated properly.
Actually, RADAR does not work by relative motion in relation to the antenna. It works based on relative DISTANCE from the antenna. RADAR stands for Radio Detection And Ranging. It works by sending out electromagnetic pulses in the microwave frequency range. These pulses bounce back in the direction they came when they strike an object. Radar measures the time it takes for those frequencies to return to the antenna after it emits a pulse. Since the speed the pulse moves through the air is known, the longer it takes for a return, the farther away the object is that bounced the signal back. The object does not have to be moving, nor does the radar transmitter. Here's a couple of photographs I took from the back of a boat in heavy fog. The first picture is what the naked eye saw in the heavy fog. The second picture is what the radar saw looking in the same direction at the same time as the first picture was taken. Each red "blob" is a boat at anchor. Look closely and you'll see a 2nd small blob behind or to the side of some of the large blobs. That's the anchored boat's dinghy tethered to the boat. The boat with the dinghy behind the flag is about 75' away (.014 mi). All the boats were at anchor, as was the vessel I was on so there was no relative motion.
