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。
To enlarge measurement range of particle rotational speed, a dual- frequency imaging method was presented, with mathematical analysis and proving experiment.
为提高颗粒转速测量范围，提出了双帧频拍摄法，并进行了数学推导和实验验证。
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