| 1. | We have realized the validating of nonlinearity in frequency sweep
在工程上实现了对了扫频非线性的校正。 |
| 2. | Frequency sweeping interference suppressing in dsss system using chirp - fourier transform
变换的扫频干扰抑制算法 |
| 3. | In our experimental tests , we used frequency swept magnetic field as excitation signal , and then measured responses of the magnetic field sensor before and after being loaded in to the sealed pressure case
在所构思的实验装置中，通过人为产生扫频磁场，对密封和非密封条件下的磁场传感器进行激励。 |
| 4. | The technology renovation project " application of frequency sweep microwave interferometer method to the measurement of electron densities in the wake of hypervelocity projectiles " is the research work of this thesis
具体要求是将所研制的扫频式微波干涉仪应用于某气动物理靶中对等离子体尾迹进行电子密度的测量。 |
| 5. | Main contents included are : 1 . analyzed , simulated and validated the effect of power fluctuation and the nonlinearity in frequency sweep on radar practical ranging precision , and the validating method of nonlinearity in frequency sweep
主要内容为: 1 .分析、仿真并验证了扫频非线性对雷达实际测距精度的影响、扫频非线性的校正方法。 |
| 6. | In addition , it also describes the method of designing microwave interferometer diagnosis systems . in chapter 4 , the frequency sweep microwave interferometer diagnosis system is designed in detail and it ' s issues and errors are described
第四章详细地设计了气动物理靶尾迹扫频式微波干涉仪诊断系统，提出了的设计思想，并说明了这类干涉仪要注意的问题。 |
| 7. | The system configuration of the fmcw level radar system based on the integrated microwave front unit ( with central frequency of loghz and frequency sweeping bandwidth of 1 . 5 ghz ) and the design of the real time signal processing unit based on the 32 - bit dsp - tms320c31 are introduced
然后介绍基于集成微波前端(中心频率10ghz ，扫频带宽1 . 5ghz )的fmcw液位测量雷达以及基于dsp ( tms320c31 )的实时信号处理系统设计。 |
| 8. | It is necessary in digital communication system that carrier recovery can compensate frequency offset and phase jitter brought by transmission and modulation . this paper is mainly focused on carrier recovery technique . we introduce the channel model at cable headed and receiving site . firstly , we introduce the principle of carrier recovery and give some algorithms of them , which are directed - decision , reduced constellation and frequency sweeping
本论文紧紧围绕着数字通信系统中的载波恢复技术，在介绍了有线通信系统所用的调制解调信道模型后，首先阐述了载波恢复技术的思想和基本原理，在此基础上给出了三种载波恢复算法，即判决导向算法、简化星座判决算法和扫频算法，并且给出了其各自的仿真图：然后深入研究了一种适合高阶qam并且能纠正较大频偏的载波恢复技术：极性判决算法。 |
| 9. | Scalar network analyzer is a kind of intelligent instrument based on frequency sweep test technology that used to measure the amplitude - frequent cy characteristic of linear system . network analyzer adopt these new technology such as frequency synthesis , sampling technique , broad - band sweeping and computer - assisted testing
标量网络分析仪是一种基于扫频测量技术,用于测量线性系统幅频特性的智能化仪器。网络分析仪结合了频率合成技术、采样技术、宽带扫频技术、计算机辅助测量等新技术。 |
| 10. | In the design of hardware , frequency sweep signal is based on dds + pll . by the control the singlechip c8051f060 , ad9852 , the dds chip , can achieve stepped frequency signal . with amplifying and detector circuits , the instrument can achieve the measurement and receiving of amplitude frequency characteristic result . by means of pdiusbd12 finish the usb1 . 1 protocol conversion , communicate with usb interface of pc , the instrument give the measurement resul of amplitude - frequency characteristic in lcd of pc
硬件方面,扫频信号源基于dds + pll的技术,由c8051f060单片机控制dds芯片ad9852实现频率步进。再加上外围放大、检波等电路,测量和接收幅频特性。并借助于pdiusbd12完成测量数据usb1 . 1协议转换,实现与pc机的usb接口通信,将幅频特性测量结果在pc机的液晶显示屏上表达出来。 |
