调波

Especially, the technology of Automatic Gain Control and signal processing are studied which are key factors working on the performance of the receiver. Based on analyzing the theory of automatic Gain Control, operational amplifiers 0P37 and logarithmic D/Aconverter AD7111A are used to design variable gain amplifiers which can be controlled numerally, A/D convector LTC1405 is Used to test the echo, Complex Programmable Logic device is used for controller, and an arithmetic is designed for automatic Gain Control which is simulated and analyzed in order to test its feasibility.

本文在分析自动增益控制AGC原理的基础上，采用集成运放OP37和数控增益衰减器AD7111A设计可数字控制的可变增益运放模块；采用高速A／D转换器LTC1405作为回波信号检测模块；采用复杂可编程逻辑器件CPLD作为核心控制模块，构成数字自动增益控制电路，并设计粗调和细调步进控制相结合的算法，对回波信号的增益进行精确而快速的调节控制，使回波信号振幅快速稳定在设计指标范围内，利于接收机后续信号处理电路对回波信号作进一步的处理。

We used coupling phototube convert the voltage of reflector voltages of klystron linearly to lower voltage, and convert the lower voltages of standing wave measuring line and crystal detector inputting power linearly to higher voltages by operation amplifier. Then we inputted these voltages to computer by analog-to-digital card and plotted the graphs of working characteristics of reflecting klystron with software .

利用光电耦合器将速调管反射极高电压线性转换为低电压，同时将驻波测量线测得电场强度的电压值和晶体检波器所测得的反射式速调管输出功率的电压值通过运算放大器线性放大，然后经过模数转换卡采集到微机中，利用软件绘制出速调管的工作特性曲线。

The authors used coupling phototube convert the voltage of reflector voltages of klystron linearly to lower voltage and converted the lower voltages of standing wave measuring line and crystal detector inputting power linearly to higher voltages by operation amplifier. Then inputted these voltages to computer by analog-to-digital card and plotted the graphs of working characteristics of reflecting klystron with software.

利用光电耦合器将速调管反射极高电压线性转换为低电压，同时将驻波测量线测得电场强度的电压值和晶体检波器所测得的反射式速调管输出功率的电压值通过运算放大器线性放大，然后经过模数转换卡采集到微机中，利用软件绘制出速调管的工作特性曲线。

The equivalent circuit of the motor with this circuit has been analyzed in detail, and the nonlinear mapping between the equivalent resistance and the duty cycle is deduced.

鉴于有些应用场合需要有轻载低速的工作点，本文在转子斩波调阻的基础上，增加了定子降压调速，推导出了定子电压的计算公式。

By analyzing the faultiness of the wavelet method used in processing signal denoise and detection of weak signal.

通过分析小波变换处理信号噪声的方法及其在微弱信号检测方面的不够完善之处，提出适合于极低信噪比条件下小波消噪法的信号检测原理和方法，即通过构造具有可调功能的阈值函数以及对小波分解系数处理方式的优化设计等方法，在强背景噪声中提取出微弱的信号特征信息，从而实现微弱信号的检测。

Such kind of implemetation can perform irrevertable or reverable speed control. the part of pwm is built on the platform of arm embedded system. it can generate two adjustable impulses which can complement each other through the control of the timers in s3c2410x chip by c programming.

系统主电路采用大功率gtr为开关器件，h桥双极式电路为功率放大电路的结构，即可完成不可逆调速同时也可完可逆调速。pwm调制部分是在arm嵌入式开发平台之上，运用c语言编程控制s3c2410x芯片的定时器来产生两路互补的宽度可调的矩形波。

multi-channel correlators are widely used in traditional pseudo-random code cw radar,which makes the ranging system more complicated.this paper proposes a method of digitalizing the return signal directly and then convoluting the signals on dsp,which can replace multi-channel correlation in analog circuit.but the computation of convolution is too huge for the dsp to fulfill.to solve this problem,this paper analyzes five fast algorithms including fft,and then chooses one according to the characters of prc-cw radars.the digital method and fast algorithm have been verified by simulated signal and real signal.

一种提高空间伪码扩谱测距精度的实用。。。摘要：传统的伪码调相连续波雷达采用多路模拟相关电路实现对回波信号的相关接收，通过多路试探搜索各距离单元的目标，电路复杂。提出的数字化方案，对回波信号直接数字化，利用高速dsp实现数字卷积，可替代多路模拟相关电路。但是直接卷积的运算量过大，dsp无法承受。本文对此进行了研究，分析了包括fft在内的五种快速算法，结合prc-cw雷达的具体情况，确定了一种适于dsp实现的快速卷积算法。仿真和实测数据证实了数字化方案及快速算法的正确性。

multi-channel correlators are widely used in traditional pseudo-random code cw radar,which makes the ranging system more complicated.this paper proposes a method of digitalizing the return signal directly and then convoluting the signals on dsp,which can replace multi-channel correlation in analog circuit.but the computation of convolution is too huge for the dsp to fulfill.to solve this problem,this paper analyzes five fast algorithms including fft,and then chooses one according to the characters of prc-cw radars.the digital method and fast algorithm have been verified by simulated signal and real signal.

摘 要：传统的伪码调相连续波雷达采用多路模拟相关电路实现对回波信号的相关接收，通过多路试探搜索各距离单元的目标，电路复杂。提出的数字化方案，对回波信号直接数字化，利用高速dsp实现数字卷积，可替代多路模拟相关电路。但是直接卷积的运算量过大，dsp无法承受。本文对此进行了研究，分析了包括fft在内的五种快速算法，结合prc-cw雷达的具体情况，确定了一种适于dsp实现的快速卷积算法。仿真和实测数据证实了数字化方案及快速算法的正确性。

Using this method, wide dimming range can be achieved with narrow frequency range and constant DC link voltage. And the lamp current keeps perfect sine wave all the time, which means low lamp current crest factor is obtained. Its validity is verified by simulation and experiment.

本章最后提出了一种基于T型滤波器的新型的调光方法，采用此方法可以在保持逆变器直流母线电压和开关占空比不变的情况下，只需很窄的频率范围就能达到非常宽的调光范围，而且在整个调光范围内灯电流都基本上是完美的正弦波，这就意味着可以始终保持很低的灯电流波峰因数，仿真和实验结果充分验证了它的优点。

There we sat among the thousand fools just like us But not so in love like us There we spoke of all our feelings And dreams were born like that And we hope for love like that Now your dreams have changed, we're far apart I don't know when or where to start leading you from my mind I want to stand with you again I hope to find you here again in the eternal sunshine *I'll search for the orange moon that lit up our love on the ocean while i held your hand Now watch all the waves from the stones where we gazed to the golden sun If i see the horizon glow just the same as it did when we stood on the hill I'll make the arrangements, just wait on that corner for me If you drop me a line I'll be sure to make these arrangements* Lay your head upon my shoulder I'll sing a tune or three Sweet melodies for thee Softly speak to say what i meant Why do you leave My heart is at your sleeve Well I'd like to share three words again practise these words with you again if you think is possible and maybe i can pull you close whisper in your ear again that i want you in my life forever I'll search for the orange moon that lit up our love on the ocean while i held your hand Now watch all the waves from the stones where we gazed to the golden sun If i see the horizon glow just the same as it did when we stood on the hill I'll make the arrangements, just wait on that corner for me You're like summer rain that cools me, it sooths me You are the person that I pray for every day Maybe we'll sit on those stairs once again Maybe we won't turn down have to pretend You will be here in my imaginings, they'reimaginings I'll search for the orange moon that lit up our love on the ocean while i held your hand Now watch all the waves from the stones where we gazed to the golden sun If i see the horizon glow just the same as it did when we stood on the hill I'll make the arrangements, just wait on that corner for me If you drop me a line I'll be sure to make these arrangements* If you drop me a line I'll be sure to make these arrangements

我们坐在有1000间我们就像傻瓜但并非所有的爱都像我们一样在那里，我们谈的都是我们的感受与梦想这样诞生我们希望这样的爱现在你的梦想已经改变，我们很遥远我不知道何时何地开始你开始疏远我我想再次与你在一起我希望在这里再次找到你在永恒阳光*我要寻找的橙色月亮这点燃了在海洋我们的爱虽然我认为你的手从现在看所有的石头波我们凝视的金太阳如果我看到地平线辉光一样因为它没有当我们站在山上我会作出安排的，只是等待，为我的角落如果你删除我行我一定要作出这些安排*把你的头后，我的肩膀我会唱一调或3 为你甜蜜的旋律说话轻声地说，我的意思你为什么离开我的心在你的袖口那么我想再次分享三个词实行这些话你再次如果你认为是可能的或许我可以把你关闭在你的耳朵小声一次，我希望在我的生活中你永远我要寻找的橙色月亮这点燃了在海洋我们的爱虽然我认为你的手从现在看所有的石头波我们凝视的金太阳如果我看到地平线辉光一样因为它没有当我们站在山上我会作出安排的，只是等待，为我的角落你喜欢夏天雨水，冷却我一样，我也sooths 你是我的人，每天祈祷也许我们会坐在楼梯上的再次也许我们不会拒绝有假装在这里，您将在我的想像，they'reimaginings 我要寻找的橙色月亮这点燃了在海洋我们的爱虽然我认为你的手从现在看所有的石头波我们凝视的金太阳如果我看到地平线辉光一样因为它没有当我们站在山上我会作出安排的，只是等待，为我的角落如果你删除我行我一定要作出这些安排*如果你删除我行我一定要作出这些安排

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失