This paper introduced the content structure and designing method of TACAN beacon CAI teaching software, and summarized the characters fo the software and the application in teaching.

In order to eliminate the effect the "sag in benchmark signal" phenomenon of TACAN beaconing to the system performance,the analysis of the reason that the sag in benchmark signal generates,and the study on the signal character of the sag in benchmark are carried out firstly.

In order to improve the effect of the wrong modulation degree of the orientation signal,namely,complex encircled modulated signal of TACAN beaconing on system performance,starting with the analysis of the reason that causes the wrong modulation degree,the paper studied the synthesizing principle of complex encircled modulated signal.

Tacan signal s analysis of the propagating characteristic under the condition of specific place;