超短波跳扩混合抗干扰电台跳频同步与基带帧结构设计与实现

【作者】 张岷涛；

【导师】 周正中； 查光明；

【作者基本信息】 电子科技大学 ， 信号与信息处理， 2006， 硕士

【摘要】 跳扩频通信在军事通信和民用通信中都具有重要的意义,软件无线电技术近几年得到了迅速发展,应用软件无线电的思想和通用平台,研究超短波多模式抗干扰跳扩混合电台的数字化实现,具有现实意义。本文从整体上介绍软件无线电的原理、关键技术、近年来的进展、应用。阐述了软件无线电技术,扩频技术在本电台中的应用。借鉴美军JTRS战术无线电系统的同步方式,本文提出了跳频同步的方案设计,并把它应用于本电台。对跳频图案的产生和跳频的帧结构,本文不仅从理论上分析了同步性能,给出了虚警概率和检测概率,估算了同步的捕获时间,证明均能满足系统指标要求,而且通过与合作单位进行的整机联调和实测证实了该方案的可行性。本文针对本电台的特点介绍了基带帧结构的设计,重点介绍了几种常用信道编码在本电台的应用,以及编解码方法在DSP中的实现,并从理论上分析了信道编码给本电台带来的处理增益。本项目主要的特点在于软件无线电理论的应用所带来的系统的灵活性,并使电台具有模块化、标准化和通用化的特点。项目的数字模块采用具有高处理能力的DSP+FPGA的数字化平台。DSP选用TI公司的高性能的TMS320C5510在CCS的集成开发环境下完成了程序设计,FPGA选用XILINX公司的可编程器件在XILINX公司开发的集成编译环境ISE中完成了系统的逻辑设计。本人在项目中主要承担了DSP的开发部分。本文在电台以前的基础上,通过对跳频部分的改进使系统的指标得到了明显的改善,成功的通过了合作方的测试。更多还原

【Abstract】 Direct-sequence/Frequency hopping technique has important purpose in military communication and civil mobile communication area. Software radio technique developed so rapidly that it is very useful to implement of very high frequency (VFH) multimode anti-jamming DS/FH radio on digital general platform by software radio ideology.The paper introduced the principle of software radio, the application of software radio, the development of software radio first, and then used the technique in our radio. The synchronization of frequency hopping method referenced the JTRS radio system of USA military, and designed a synchronization method used in our radio include creating the frequency hopping map and the base band frame architecture in frequency hopping mode. The paper also analyzed the synchronization capability on theory. It has been proved correct on theory by showing the false probability, capture probability and the synchronization time. It has also been proved correct in practice by testing with cooperator.The paper analyzed the character of our radio and introduced the procedure of designed base band frame architecture. It showed the application of channel coding in our radio, and encode/decode method implemented in DSP. On theory, the paper analyzed the coding gain of the channel coding.The character of our radio is the flexibility, standardization and modularization by application of software radio theory. The digital module of the radio was constructed by high performance DSP+FPGA platform. The DSP was produced by TI. Programmed in integrated development environment named CCS, FPGA was selected in XILINX’s production, and then programmed in integrated development environment ISE.This paper based on the previous achievement, and researched in frequency synchronization. It has get obvious promotion the performance index of radio in testing with cooperator.更多还原