π/4-DQPSK

π/4-differential quadrature phase shift keying modulation(π/4-DQPSK) plays a very important role in the data link communication.

基于四相差分相移键控(π/4-DQPSK)的调制方式在数据链通信中占有十分重要的地位,从分析π/4-DQPSK基带与频带信号特征出发,以Link-11A数据链通信信号为基础,研究了用于跟踪瞄准式干扰的3种干扰样式:噪声调频、多音频调频、频移键控对π/4-DQPSK信号的干扰。

In order to achieve good control effect in the research of special electronic power transformer(EPT),we employed Park transformation to implement the transfer from the double closed-loop decoupled control of three-phase to four-phase EPT s primary side.

在特种电子电力变压器的研究中,为了达到良好的控制效果,采用Park变换来实现三相变换到四相电子电力变压器高压侧的双闭环解耦控制。

Study On 4-phase Separation of Drilling Fluid with High Density and High Viscosity;

高密高粘钻井液四相分离技术研究

The Establishment of the Mathematical and Numerical Compositional Model of Three Dimensions and Four Phases;

三维四相多组分数学模型和数值模型的建立