字定义 中文名称：双模变频 英文名称：Dual Frequency 定义：具有两种变频模式，它具有单模直流变频所有的优势，又有高效省电和长效节能两种变频运行模式 所属科学：通信科技（一级学科）；通信原理与基本技术（二级学科）百科
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dual-frequency motor 双频率电动机 ; 双频率电念头 ; 双频电动机 ; 双频次电动机
dual-frequency sounder [测] 双频测深仪
dual-frequency laser interferometer 双频激光干涉仪
dual frequency dye laser 双频染料激光器 ; 双面啮合齿轮检查仪
Dual frequency resonance tracking 双频共振追踪压电模式
dual frequency GPS receiver 双频GPS接收机
dual-frequency radar 双频雷达
The dual-frequency carrier phase observation equation is built and ionosphere-free predigested, the estimate formula of zenith wet delay is deduced with least square method.
建立了双频载波相位观测模型，并将其进行无电离层延迟化简，用最小二乘原理推导了天顶湿延迟的估值公式。
The machine adopts dual-frequency conversion timing technology and Japan panasonic transducer, assuring every part drives synchronously.
采用双变频调速技术，日本松下变频器，保证机器各部位运行同步。
However, slightly different paths of carrier L1 and L2 will bring errors to estimations of the dual-frequency method.
不过，两载波信号l 1和l2之间的传播路径差异会给双频方法带来误差。
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