radionavigation

GPS Positioning Services Specified In The Federal Radionavigation Plan;

全球定位系邦无线电导航计划的定位服务；

The risk assessment study indicates that the satellite system can't be considered as the sole-means for the nations radionavigation system.

风险评估表明星基系（GPS、GLONASS）不作唯一的导航、定位、定时手段。