In chapter 3 , the paper presents the theory of wigner - ville distribution ( wvd ) , pseudo wvd , smoothed pseudo wvd , discrete fourier transform ( dft ) , fast fourier transforms ( fft ) , and also expatiates on the 第三章将对wvd 、 pwvd 、 spwvd分布、 dft和fft变换的理论进行说明,并阐述跳频解跳与数字中频接收机的解跳原理。
With the fast development of software radio technology , the wideband digital receiver systems are coming to play a major role whether in the communication systems or in the radar systems 随着软件无线电技术的迅速发展，无论是通信系统还是雷达系统，都希望能够构建基于软件无线电技术的中频接收机系统，从而可通过软件来定义硬件平台的功能，大大提高系统的灵活性。
The thesis that did the research focusing on the realization of real - time de - hopping processing , introduces the hardware and software models of the de - hopping and digital intermediate frequency receiver and describes the key part of the design 本文将对跳频信号的实时解跳处理进行研究,着重对跳频解跳与数字中频接收机的实现上进行论述,并介绍该接收机的软硬件模型,对实现方案的重要环节进行阐述。
This paper discusses key technology in the digital intermediate frequency receiver with wide band based on software radio , including down - converter on condition of band - pass - sampling , digital down - converter , multi - rate digital signal processing , band - pass signal decimating , and achieves software system simulation based on under - sampling 摘要分析了基于软件无线电的宽带数字中频接收机中的关键技术带通采样下变频技术、数字下变频技术、多速率处理技术，并实现了欠采样技术条件的软件系统仿真。
The results of computer simulation and fpga simulation indicate that the technique is feasible and the experiment ' s results show that the performance of the system is excellent . in this paper , it summarize the basic principles of the if ( intermediate frequency ) digitization technology and detail the design and fpga realization of the digital if receiver system 在具体实现中，提出了一种基于多相滤波结构来进行抽取滤波的中频接收机方案，通过计算机仿真，证明了它的可行性，并围绕此方案完成了数字下变频硬件系统的设计和调试工作。
Based on the dsp development board , the author finishes the hardware debug about the multi - channel buffered serial port ( mcbsp ) receiving the output signal from the gps if collector and resolves the software program of the receiving buffer of the multi - channel synchronous serial data , data integration , udp datagram encapsulation and network interface driver , etc . the real - time udp datagram receiving , data frame de - encapsulation and high speed data memory are implemented , and a friend application interface with windows message is developed on the pc 基于dsp开发板,作者完成了dsp的多通道缓冲串口( mcbsp )接收gps中频接收机输出信号的硬件调试,并解决了多通道同步串口数据的接收缓冲、数据合并、 udp数据报装帧及网络接口驱动等软件编程。在pc端,通过mfc的网络应用开发类casyncsocket实现udp报的实时接收、数据解帧译码、高速存贮,利用windows消息机制开发了应用程序友好界面。
This paper has main two tasks as below : ( a ) study and analysis the theory and the index of the big dynamic range if receiver . design the blue print . ( b ) demonstrate the blue print , draw the schematic , simulate and realize the if receiver showpiece 此项研究主要分以下两个方面: ( 1 )对接收机大动态范围、高线性、高灵敏度、高分辨率等各项指标实现的研究,并根据实际要求设计系统方案; ( 2 )对于中频接收机的模拟和数字方案的论证、器件选择、电路设计、软件编程仿真、样机制作与调试。
That extremely promotes the development of the receiver . also the requirement of receiver becomes more rigorous . as the name implies , receiver need to improve the linearity , to reduce the distortions rate and bit error rate , and to expend the dynamic range , of course should ensure the signal detect capability precondition 这些要求同样也促进了中频接收机的不断进步,要求其在保证信号检测能力(即极高的灵敏度)的前提下:尽可能的提高接收机的线性度,使信号失真最小、误码率最低;尽可能的展宽接收机的动态范围,使接收机的适应度更大、抗干扰能力更强。
