The two sub-systems are air data system (ADS) and tactical airnavigation system (TACAN).
以塔康系统为例对特定频段导航系统信号进行了分析和模拟。
2
In 1919, the International Commission for AirNavigation (ICAN) was created to develop General Rules for Air Traffic.
1919年，国际航空委员会(ICAN)成立，并开始制定空中交通通用规则。
3
"User charges" means a charge imposed on airlines for the provision of airport, airnavigation, or aviation security facilities or services including related services and facilities.