Point Source Transmitting Power Estimation of Wireless Avionics Intra-Communication Systems Using the Large-Scale FDTD Method

Wireless avionics intra-communication (WAIC) systems are operated at the same frequency bands as aircraft radio altimeters, i.e., 4,200-4,400 MHz. The coexistence conditions of WAIC systems and radio altimeters are investigated in detail with respect to electromagnetic compatibility. Firstly, the 4-GHz electromagnetic field around a three-dimensional Airbus A320 aircraft model is obtained through large-scale finite-difference time-domain analysis. Then, a transmitting antenna is modeled at the center of the aircraft at window height. Finally, the point source transmitting power at the geometrical center of the aircraft is estimated for the coexistence investigation.