This paper researches the integrating application of adaptive antenna array technology , spread - spectrum communication technology and transform - domain filter technology in shortwave communication area , basing on the background of improving on the shortwave communication equipments being used in chinese army , and all the key techniques mentioned above are implemented in a single fpga chip 本文以改造我军现役短波通信设备为背景,研究了自适应天线阵技术、扩频通信技术、变换域滤波技术等多种现代数字信号处理技术在短波通信中的综合应用,并以单片超大规模fpga芯片为硬件处理平台,对系统中的关键技术进行了设计与实现。
On the other hand , take into account of the designing requirements of the system , bring forward technology keys that need to be resolved at once . at the same time the main content of this dissertation , short wave communication , the specialties of modem technology and developing trend are briefly showed . in chapter 2 , introduce whole design of radio communication system , one by one calculate and design according as the constitute of communication system 本论文给出浮标监测系统短波数传的研究和设计成果，全文从以下四个方面进行了论述：在第一章里，从项目需求背景出发，指出了研制本系统的实际意义，根据系统的设计要求，提出了需要解决的技术关键，简介了本文的主要研究内容，最后简要介绍了短波通信以及调制解调技术的特点和发展趋势。
Simulator presented in this paper provides a direct interface for the test of shortwave communication system , which well represents various features of hf channel such as multi - path delay , rayleigh fading , doppler shift , doppler spread , gaussian noise and impulsive interference , etc . in order to realize the channel simulation for the intermediate frequency signal , we , inspired by the idea of soft - defined radio , bring forward a new design method that the channel simulator consists of several dsp chips 本文研制的仿真器提供接口直接对短波通信系统进行测试,能够全面反映短波信道的多径时延、瑞利衰落、多普勒频移、多普勒扩展、高斯噪声和脉冲干扰等特性。为了实现对中频信号的信道仿真,开发出一个结合软件无线电思想的由多个数字信号处理芯片构成的短波信道物理仿真器。
This thesis adopts 8psk / qpsk modulation mode that ' s widely applied in short - wave communication to research all - digital blind receiver in burst mode based on software radio technology . then related solutions are given for the doppler frequency shift problem and multiple fading problem in short - wave channels . the arrangement of the thesis is below : chapter 1 gives brief description for the new technology and new systems of short - wave communication and for the development and appliance of software radio 本文采用短波通信中应用广泛的8psk qpsk调制方式，研究基于软件无线电技术的突发模式全数字盲接收机，并对多音并行及慢速传输中存在的多谱勒大频偏问题、单音串行、高速数传时在短波通信链路中发生的干涉衰落问题做了研究，提出了相应的解决方案。
The ionosphere is a complex medium , which is aeolotropy , asymmetry , dispersive and changes randomly with time . in order to improve the communication quality of the shortwave that depends on the ionosphere , we should have aknowledge of the current condition of the ionosphere in real time . the backscatter sounding of high frequency can diagnose the real - time channel characters for shortwave communication or hf radar , which is great assistant to shortwave communication and hf radar 电离层是随机时变,各向异性,非均匀、色散的复杂介质。为了保证依赖于电离层进行的短波通信质量,必须了解电离层的实时状态信息。高频返回散射探测可以实时监测与短波通信或高频天波雷达相关的天波传播信道的状态,对短波通信和天波雷达工作起了重要的辅助作用。
