遇险呼救 meaning in Chinese

distress call

Electromagnetic compatibility and radio spectrum matters - maritime mobile earth stations operating in the 1 , 5 ghz and 1 , 6 ghz bands providing voice and direct printing for the global maritime distress and safety system - technical characteristics and methods of measurement v1 . 1 . 1
电磁兼容性和无线电频谱情况.全球海上遇险呼救与安全系统用提供声音和直接打印的工作频带为1 . 5ghz和1 . 6ghz的海上移动地面站.技术特性和测量方法