four main sensors are being used in autonomous
cars to detect the surrounding objects;
- Ultrasonic :
It creates a sound wave that reflects from the surrounding object to the car. But the time it takes to return to the car is proportional to the distance of the object and the car. the longer the distance between them the longer the time it takes to return to the car(we can’t hear the sound because it’s outside of human sound range .). the highest covered range is about 3 meters .so its better for parking, blind detecting, understanding immediate surrounding. probs:
these sensors don’t cover a long range. it’s not great at detecting a car.
if it stops 100 meters ahead of you. It’s popular in marine applications because sound travels better through water than air. 2.
2. Radar:
Radar stands for radio detection and ranging. It’s kind of like the ultrasonic but it uses radio waves instead of sound waves to detect an object. but it’s kind of better than the ultrasonic but it can produce long waves that can travel through fog, rain, no matter what the weather condition gets. but it’s also not that much accurate. it can`t recognize what the object is. and sometimes it gets reflected way too much because of high reflective objects like aluminum and thus it can cause bad detection.
3.liDAR ( light radar):
lidar stands for Light Detection and Ranging is a remote sensing method that uses light in the form of a pulsed laser to measure ranges. this system can recognize its surrounding objects like it can tell whether it’s a car or a bike around you . as the laser must use electromagnetic waves for shorter wavelengths, light cant cut through things like heavy fog or rain.
probs:
this sensor kinda looks ugly on top of cars. it is an expensive sensor but not pretty. however these 3 sensors cant see actually. as you drive, you need to learn the signs too. so these sensors cant ready signs along the roads and cant even tell if the traffic light is going red or green.
- cameras:
almost every autonomous systems integrate cameras in them because it works like kind of eye.
TechrantsByRae 