Take european dvb - s standard applied to various satellite broadcast for example , the channel coding structure charts is established . the theory of modulation mode of qpsk and forward error correct including rs coding , convolutional coding , energy dispersal and interleaving are reseached . 4 以欧洲的dvb - s适用于多种卫星广播系统的标准为例，建立了信道编码的结构图，对数字视频广播中的前向纠错(包括了rs码，卷积码、能量扩散和交织技术)和调制方式四相相移键控调制进行了研究。
This paper puts emphasis on dynamic simulation based on switched reluctance drivers ' s ( srd ' s ) nonlinear model , and study of fuzzy control for srd . based on switched reluctance motor ' s linear , nonlinear model , the dynamic simulation model of srd ' s is built respectively . the phase current , phase torque , total torque and speed of srm in current chopping control ( ccc ) and angular position control ( apc ) are calculated respectively with this simulation 本文在分析sr电机线性、准线性、非线性模型的基础上建立了四相( 8 / 6极) sr电机调速系统( srd )动态线性、非线性仿真模型，分别对电流斩波控制方式( ccc )与角度位置控制方式( apc )下sr电机相电流、一相转矩、合成转矩及角速度进行了仿真。
But in fact , there are many windings on each leg of a balance transformer , and the winding impedance relationships that the balance condition requires are strict , so it is difficult to design and make such transformers . if adopting the connection scheme of dual windings , the windings on single leg will increase almost doubly . it is more difficult to satisfy the balance condition and probably it will confront conflict when arranging these windings , so parameters of various phases can not be balanced 事实上由于平衡变压器单柱绕组数目较多,若采用双重接线方案,则单柱绕组数目增加近一倍,满足平衡条件十分困难,甚至使得绕组在空间上的布置产生矛盾,无法达到各相参数平衡的要求,而“四相四心柱“结构的三相变四相电力变压器较好的解决了这一难题。
This system can process linear frequency modulation signals ( lfm ) , nonlinear frequency modulation signals ( nlfm ) and taylor quadriphase code signals with time width under 42 s and band width under 5mhz . the experimental results demonstrate that the specification characteristics meet the requirements of practical radar systems 该系统可处理时宽在42 s以内?带宽在5mhz以下的线性调频信号( lfm ) ,非线性调频信号( nlfm )和taylor四相码信号,且技术指标完全满足实用系统的设计要求。
It is the simplest form among transformers in this kind . for evaluating the relationship between the error of winding impedance and the performance of the three - phase to four - phase power transformer , this paper uses “ matlab ” as a digital simulation platform to exam the mathematic model and analyze the balance condition as well as 因此,本文对不同排列方式,不同回数四相输电线路的电场、磁场、无线电干扰和可闻噪声进行了详细的分析和计算,并把它们与三相输电线路相应的电磁场参数进行了全面比较。
