3 ms·
Except the kind of radar used in a Tesla cannot do that for you hence while the AP ignores static objects and crashes happily into parked cars, fire trucks, ...
by mshook 5y ago
Except the kind of radar used in a Tesla cannot do that for you hence while the AP ignores static objects and crashes happily into parked cars, fire trucks, ...
Here's an explanation of why written on here a long time ago by @chowells:
https://news.ycombinator.com/item?id=16239612 https://news.ycombinator.com/item?id=16239612
This user wrote:
To add even more detail, as there still appears to be a lot of confusion:
The radar systems in these vehicles send out a radio pulse in a broad approximate-cone forward. They get bounces back from everything that reflects radio in front of them. Distance from the object is calculated by time between pulse and response. Speed towards/away from the object is calculated from Doppler shift of the radio frequency.
There are two main things that these systems can't detect.
1. Speed of the object perpendicular to the direction of radio wave travel.
2. Location of the object within the approximate-cone the radio pulse travels in.
Note that thanks to the second, you can't calculate the first with higher-level object tracking, either.
So the data you get back is a list of (same-direction velocity component, distance) pairs. There's no way to distinguish between stationary objects in the road and stationary objects above the road, to the side of the road, or even the surface of the road itself.
Radar just doesn't provide the directional information necessary to handle obstacle detection safely.