TL;DR
A team at Worcester Polytechnic Institute (WPI) has developed a system using low-power ultrasonic sensors to help drones navigate in challenging environments, similar to how bats use echolocation. Traditional navigation methods like radar, lidar, and GPS can struggle in low-light or obstructed conditions, and they often consume too much power for battery-operated drones. By implementing a dual sonar array, the researchers created a more efficient sensing solution that performs well where visual systems fail.