172214 ⎘
Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves; Systems for determining direction or position line using amplitude comparison of signals transmitted sequentially from antennas or antenna systems having differently-oriented overlapping directivity characteristics, e.g. equi-signal A-N type the signals being transmitted sequentially from an antenna or antenna system having the orientation of its directivity characteristic periodically varied, e.g. by means of sequentially effective reflectors
WIRELESS ACCESS CONTROL SYSTEM
#2Determining a location of a runway based on radar signals
#3Method, control apparatus and vehicle
#4Method and apparatus for determining a position of user equipment, and an antenna set therefor
#5METHOD AND APPARATUS FOR RECOGNITION OF DEVICES
#6System for the relative navigation of aircraft and spacecraft using a phased array antenna