Raytheon Company (NYSE: RTN) and the U.S.Army recently completed successful testing of the first Advanced Extremely High Frequency, or AEHF, satellite communications production terminals. 雷神公司和美国陆军最近成功完成首个先进极高频或AEHF卫星通信生产终端测试。
Advanced Extremely High Frequency System 先进极高频系统
The seismicity in Yunnan region in the 20th century occupies a front place in Chinese mainland in extremely high frequency, strength and hazard rate. 20世纪云南地区地震活动以极高的频度、强度和成灾率而位居我国大陆之前列。
Rather than sample at extremely high frequencies, these DAQ systems implement some low-pass filters that cut out waveforms above the 250 Hz. 采样频率极高的DAQ系统采用一些低通滤波器过滤掉波形在250Hz以上的信号.