他们开始提供一套以目视信号为基础的空中交通管制。
They began to provide a form of air traffic control based on visual signals.
第一百五十一条民用航空器遇到紧急情况时，应当发送信号，并向空中交通管制单位报告，提出援救请求；
Article 151 A civil aircraft in emergency shall flash signals and report to air traffic control unit to request rescue;
简要介绍了空中交通管制雷达的组成，提出了一次雷达、二次雷达信号模拟器的实现方案，对相应的软、硬件设计进行了分析。
The implementing project for the signal simulator of the primary radar and the secondary radar is presented , and the corresponding designing of the hardware and software are analyzed.
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