But delays and inefficiencies in air travel are due in large part to an outdated traffic-control system that still relies on slow, ground-based radar stations and repetitive voice communication.
不过航空运输延迟和低效的主要原因还是过时的空中交通管制——一套依靠地面控制、反应迟缓的雷达站和不断重复的语音通讯建立起来的体系。
The control and actualize system of variable rate fertilization consist of DGPS, Field Computer, Hydraulic Motor, Ground Sensing Radar and fertilizer assembly.
变量施肥的控制实施系统包括差分gps系统、田间计算机、液压马达、测速雷达和排肥器总成。
This proves that the one-dimensional trajectory amendments mode of ground radar surveillance and progroud fire-control center control is entirely feasible and can achieve low-cost and miniaturization.
由此可见，采用地面雷达导航、由地面火控中心发射指令的一维弹道修正方式完全可行，并可以做到低成本，小型化。
This proves that the one-dimensional trajectory amendments mode of ground radar surveillance and progroud fire-control center control is entirely feasible and can achieve low-cost and miniaturization.
由此可见，采用地面雷达导航、由地面火控中心发射指令的一维弹道修正方式完全可行，并可以做到低成本，小型化。
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