Angle of Departure (AoD) is a positioning method that can be used to determine the location of persons in real time. With the AoD method, the angle of the radiated radio signals is determined via their phase difference and the location of persons is determined from this.
In contrast to the AoD method, which works with the radiated angle of the radio signal, the AoA method, Angle of Arrival (AoA), calculates the position via the angle of incidence of the received radio signals. The transmitter of the AoD radio signal uses the individual antennas of the antenna array sequentially and the receiving side knows the switching sequence of the antenna array.
Both positioning methods can be carried out with satellite navigation, but also with mobile radio technologies and radio frequencies in the 2.4 GHz range, i.e. with WLAN and Bluetooth. The advantage of WLAN and Bluetooth is that satellite-based positioning with the GPS system or Galileo does not work stably indoors. However, there is also a great need for indoor positioning, in congress centers or industrial halls.