Radar tracking of the shuttle, like the final accurate ground-based navigation, had not yet begun.
对航天飞机的雷达追踪，如最后精确的陆基导航，还没有开始。
Air travel still relies on a ground-based tracking system from the 1950s, which forces planes to use inefficient routes in order to stay in contact with controllers.
自上世纪50年代以来，航空服务一直依赖于地面导航的航道系统，飞机被迫按低效航线飞行，以与空中交通管理员保持联系。
Furthermore, the idea and method of sensor model design were discussed in detail while taking example for the ground-based tracking-while-scanning radar.
并以地基边扫描边跟踪雷达为例，详细探讨了传感器模型的设计思路和方法。
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