If your single sensor would have a very wide range, you would have no way of telling in which direction the obstacle is. So you need sensors that have a very narrow range, and then scan the area. That's what makes them expensive.
If your single sensor would have a very wide range, you would have no way of telling in which direction the obstacle is. So you need sensors that have a very narrow range, and then scan the area. That's what makes them expensive.