短語詞組短語linear frequency modulation spectrum analysis 線性調(diào)頻Frequency Hopping Sspread Spectrum Modulation 跳頻擴(kuò)譜調(diào)制frequency hopping spread spectrum modulation 跳頻擴(kuò)頻調(diào)制spread spectrum frequency modulation 擴(kuò)頻調(diào)制 返回 frequency modulation spectrum