The jamming of multiple noise and the polynomial phase modulation caused by non - uniform relative motion are the main problems in mmw doppler guidance radar signal processing 乘性噪声的干扰和非匀速相对运动所引起的多项式相位调制是毫米波多卜勒制导雷达信号处理中所面临的主要问题。
Uast is equipped with the complex radar system of both continuous wave pseudorandom code phase modulation and mono - pulse amplitude comparison ( crs ) , and crs measures and gets target ' s position information 在坦克超近反导系统中，装备伪码调相连续波与单脉冲幅度比较复合体制雷达，用于测量目标的位置信息。
During these processes , diffraction , self - phase modulation , cross - phase modulation and physical distance between the beam centers all have important effects on the beams and the pulse beams propagation 在这些过程中，衍射、自相位调制、交叉相位调制、光束之间的间距等都对光束和脉冲光束在非线性介质中的传输产生重要的影响。
But up to now , none of them are commercially available . among these technologies , wavelength converters based on cross - gain modulation , cross - phase modulation and four - wave mixing in semiconductor optical amplifier is the mainstream of research 其中，基于半导体光放大器中的交叉增益调制、交叉相位调制和四波混频效应的波长转换技术是研究的主流方向。
Chapter5 : the effect of cross - phase modulation ( xpm ) on pulse propagation and sc spectrum generation in a dispersion - flattened and decreasing fiber are researched . it is found that xpm could enhance the sc spectrum generation and increase the generation efficiency 研究结果表明，交叉相位调制效应对超连续谱的产生起到增强的作用，提高了超连续谱产生的效率。
When the pump power of the input pulse was lower , the enhancement on sc spectrum generation due to cross - phase modulation effect is more significantly . the cross - phase modulation effect increased the sc spectrum generation efficiency greatly 当输入脉冲的泵浦功率较低时，交叉相位调制效应对超连续谱的产生的增强效果更为显著，它极大地提高了超连续谱的产生的效率。
This work mainly studies the influence of cross phase modulation ( xpm ) on dwdm systems and schemes to suppress the influence . in addition , all - optical wavelength converter based on xpm in optical fiber is studied 本文主要研究密集波分复用系统中的一种重要的非线性效应? ?交叉相位调制对系统性能的影响及减小其影响的方法，并研究基于光纤中交叉相位调制的波长转换器。
Self - focusing and self - defocusing have their origin in the intensity dependence of the refractive index of the nonlinear medium . the picture becomes more complicated when two copropagating optical beams affect each other through nonlinear cross - phase modulation 当两光束共同在非线性介质中传输时，两光束由于交叉相位调制效应将会相互作用，其物理机制变的比较复杂。
Recently , frequency - hop communication has been widely used in many military wireless communication domain as a secure transmission mode . in frequency - hop transmission , phase modulation system has good performance and high frequency efficiency 跳频传输模式下的数字相位调制系统具有较高的抗噪声性能，且能有效地利用频带，实现数据的高速传输，是一种比较优越的调制方式。
The theoretical analysis and result of simulation indicate that the two - phase modulation reduces the switching losses 50 % relative to the quasi - optimum and the space vector modulation and overmodulation can generate higher voltages with low total harmonic distortion 分析表明二相调制方法相对于准优化方法减少开关损耗近30 ，空间矢量的调制与过调制可以大大的提高直流母线电压的利用率。
