Second , the results of theory analysis and simulation research show that the output of one cycle controlled bridge switching power amplifier have dc offset because of the nonideal characteristic of reset signal . the magnitude of output dc offset voltage is proportional to width of reset pulse . a voltage compensation technique is used to solve this question , and the computation formula of compensation voltage is gived . the circuit compensated and not are researched through simulation and experiment , which results show that compensated circuit solve the output dc offset effectively 其次,理论分析和仿真研究结果表明,由于复位脉冲的非理想特性,单周控制的全桥开关功率放大器输出端存在直流偏置问题,其大小与复位脉冲的宽度成正比。针对输出直流偏置问题,提出了电压补偿的改进方案,给出了补偿电压的具体计算公式。对补偿前和补偿后的方案进行了对比仿真研究和实验研究。
Because of the elements which run under nonideal linearity and unentire symmetry in the power system , the loads which are different and change randomly , the methods which adjust and control the system faultily and operate improperly , the disturbance and the malfunction which happen somewhere , the current and voltage in the supply system are distorted seriously and thus large amount of harmonics are produced 但是,由于电力系统元件运行的非理想线性或非完全对称、负载的性质各异且随机变化、调控手段的不完善以及错误操作、外来干扰和各种故障的存在,供电网中的电流(电压)发生畸变,产生大量谐波。
Distortion and gauss white noise distortion . the simulation of ideal system aims at absolutely clean channel , and the nonideal systems respectively set their channels as ricean channel ( multipath distortion channel ) and awgn ( gauss white noise distortion channel ) . at the end of simulation , it use examining means of communication system as ber ( bit error rate ) analysis and eye diagrams analysis , then gives a summarize and a comment to the system 仿真中的系统结构、模块和传输速率的选择符合标准的dvb1规范en300744 ,理想系统的仿真是针对完全干净的信道,而非理想系统分别将信道设置为hcean信道哆径干扰信道)和awgn (高斯白噪声信道) ,仿真最后用通信系统的检测手段进行误码率分析和眼图分析,并对该系统作了总结和评价,加深对了dvb1系统的信号处理过程的理解,明确了目前面临的问题。
Through matlab simulations , this improved algorithm can not only achieve the same resolution ability as the conventional music algorithm in ideal conditions , but also acquire the resolution ability and estimation precision that music algorithm can ’ t obtain in the nonideal condition of so - called signal eigenvalue leakage 通过matlab仿真,该改进方法不仅可以在理想情况下取得和传统music算法一样的分辨力,而且在所谓的信号特征值泄露的非理想情况下可以取得传统music算法不能达到的分辨力和估计精度,同时一定程度上减小了运算量。
In this paper , we first classify the nonideal scattering centers to three kinds through analysis the assumption of ideal scattering centers model . they are dispersive scattering centers , glide scattering centers and anisotropic scattering centers . also we conclude that all of them make the image blur by research on their display on imaging 通过概括理想点散射模型所包含的假设前提条件,限定出了模型失配的原因,提出了非理想散射中心的分类方法:把它们分为色散型散射中心、滑动型散射中心和各向异性散射中心,并分析了各种类型非理想散射中心在图像域的表征。
In this thesis , based on this kind of application , we made theoretical analysis and engineering practice on high - precision lfmcw and its signal processing millimeter wave broadband lfmcw radar has quite high theoretical range - precision and distance resolution , however , for the real radar system , the nonideal parameter of its transmitting signal , such as power fluctuation and the nonlinearity in frequency sweep , will result in the decreasing of the practical rang - precision and the distance resolution of radar 本文基于这一应用对高精度lfmcw测距雷达及其信号处理进行了理论分析和工程实践。毫米波宽带lfmcw雷达具有很高的理论测距精度和距离分辨力,但对于实际的雷达系统,其发射信号的非理想参数-扫频功率起伏和扫频非线性,将使得雷达的实际测距精度和距离分辨力下降。
In the design and debugging process we found that two different caps with parallel connection may make the amplifier instability . with the analyses of the nonideal cap molding we found that the response curve of two different caps with parallel connection has a saltation whose impedance is infinity and at this pot the amplifier is easy to oscillate . than some suggestion of the use of cap in amplifier design is presented 在放大器的设计、调试过程中发现两个不同容值的电容并联会带来电路的潜在不稳定,对实际电容,即带有寄生电感和寄生电阻的电容,建模、分析后发现,不同容值的电容直接并联其响应曲线会有一个阻抗值为无穷大的突变点,该突变点可能会引起电路的自激。