Transmit power of interrogations controlling method in TCAS

The methods of controlling the transmit power of integration to limit the interferences which are resulted from air-to-air communication in the traffic alert collision avoidance system are proposed. The dynamic controlling of tracking integration power for mode S targets and the variable steps whisper/shout interrogation for mode A/C targets are presented. In order to analyze the validity of the methods, the distribution model of aircraft traffic density is established. Additionally, the procedure for interrogations power controlling and the implementation in surveillance function are described.