At present, the civil aviation is the use of the ground navigation system, the precision is low, waste of airspace resource, but also the ground navigation system error is with the aircraft from the navigation station distance increases. 中国民航现在使用的是基于陆基导航系统的传统空中交通管理方式,精度低,所需保护区大,浪费了空域资源,而且陆基导航系统的误差是随飞机离导航台的距离增大而增大。