frequency spread meaning in English
频率扩展
频率展开
Examples
- Two kinds of typical wideband signal , frequency modulation ( fm ) signal and frequency spread signal , is analyzed qualitatively with wideband ambiguity function
以宽带模糊度函数为工具定性地分析了两类典型宽带信号，即调频信号和频率分集信号。 - Then , the system model and its simulation flow chart in matlab are introduced for mc - cdma system . and some technologies of mc - cdma and their functions in mc - cdma system are emphasized , such as frequency spread of data in frequency domain , ifft and cyclic prefix , and so on
然后在给出了mc - cdma系统模型和matlab仿真流程基础上，重点讨论了mc - cdma系统中的主要应用技术及其在整个系统中的作用，例如数据的频域扩频、 ifft变换和循环前缀等。 - But in the east , 30 ~ 60 - day low frequency propagates toward north and west and 10 ~ 20 - day low frequency spreads to south from mid - latitude as well as to east from 90 " e . 10 - 20 - day and 30 - 60 - day low frequent rain band centers , located in south china , upper - middle yangtze basins , northeast china , north china and the west part of china , are all important parts of asian summer monsoon rainfall
东部地区， 30一60天振荡有明显的向北及向西传播; 10一20天低频降水随位相从中纬度向南传播，同时从90 ? e向东传播。东部地区的10一20天和30一60天低频雨带中心都是东亚夏季风降水的重要组成部分，当地的夏季风降水受这两种低频振荡调制。 - To improve anti - jamming technique by spread spectrum close to monochromatic frequency , so that enhance the ability of anti - active - jamming and anti - passive - jamming , anti reconnaissance , anti - radiation missile , anti - stealth , by means of multi frequency spread spectrum and hopping spectrum instead of mono - frequency spread spectrum , realizing strong processing system for anti - interference signal , providing the method of generating of chirp signal and corresponding matched filter system
摘要为改进线性调频雷达系统所采用的在单色频率点附近扩谱抗干扰技术，加强制导雷达站具备抗有源、无源干扰，反侦察，抗硬杀伤的反幅射导弹和反隐身的能力，通过将单频点扩谱改为多频点扩谱跳谱，实现了高抗干扰信号处理系统，给出方案中在中频段实现的线性调频信号产生方法以及对应的匹配滤波处理系统。 - This thesis researches some key techniques in digital mid - frequency transceiver under spread spectrum system . a digital mid - frequency spread spectrum transceiver is implemented on fpga , and has been timing - simulated on computer . this thesis firstly summarizes the basic theory of digital mid - frequency and software radio
本文针对扩频体制下的数字中频收发机的关键技术进行了研究，并以此为基础在fpga上实现了一套数字中频扩频收发机，通过了计算机的时序仿真验证。