线性调频 lfm linear frequency modulation: 线性频率调制linear feet per minute (lfm): 每分钟直线英尺linear fm pulse compression: 线性调频脉冲压缩lfm: 有限域细网格模式non-linear fm pulse compression: 非线性调频脉冲压缩下载手机词典可随时随地查词查翻译