View source for Autonomous and automatic landing system for drones

'''Autonomous and automatic landing system for drones'''

Garrec, P., & Cornic, P. (2012). U.S. Patent No. 8,265,808. Washington, DC: U.S. Patent and Trademark Office. https://patents.google.com/patent/US8265808B2/en 

===Summary===
This patent brings forward an automatic aircraft landing guidance system which uses an electromagnetic detecting and locating device on the ground, which uses echo to determine the drone’s distance and angular position. This information is transmitted to the drone via radiofrequencies, so the drone can land very accurately. The drone itself also provides measurements which it communicates with the ground to have maximum accuracy.