基于扩频技术的雷达通信信号处理实现

发布时间：2018-03-25 13:30

本文选题：扩频通信技术　切入点：FPGA　出处：《南京理工大学》2014年硕士论文

【摘要】：基于扩频技术的雷达通信信号处理实现是以雷达系统中的通信系统为研究背景,通过扩频调制技术完成雷达与相关受控设备之间的通信。扩频调制技术因为其良好的抗干扰性能和隐蔽性,在其诞生之初就是应用于军事领域,近年来得到了飞速的发展,将它运用到雷达通信系统当中,也是完全符合雷达通信系统隐蔽通信和对抗电子干扰的需求。本文在开始阶段根据雷达通信系统的结构,设计了系统发送端与接收端的通信流程；紧接着讨论了扩频通信技术的理论基础和关键技术,并根据雷达通信系统的实际情况选择了扩频方式、扩频码和同步方式。之后根据系统的要求设计了一个基于spartan-6FPGA的硬件平台,绘制并完成了PCB。然后重点讨论了如何在这个硬件平台上配合ISE软件平台和VHDL语言完成设计的通信流程并恢复信息。系统发送端采用m序列进行直接扩频,经过2DPSK调制发送信息,接收端采用差分相干解调、匹配滤波器解扩和恒虚警判决来恢复信息。最后,将通过示波器和chipscope观察到的收发两端的硬件调试结果与matlab、modelsim的仿真结果相比较,验证了本文从系统流程设计、硬件平台的搭建到软件算法的正确性,达到了实时通信的目的。
[Abstract]:The realization of radar communication signal processing based on spread spectrum technology is based on the communication system of radar system. Communication between radar and related controlled equipment is accomplished by spread spectrum modulation technology. Because of its good anti-jamming performance and concealment, spread spectrum modulation technology was applied in military field at the beginning of its birth, and has been developed rapidly in recent years. Applying it to radar communication system is also in line with the requirements of hidden communication and electronic jamming in radar communication system. In the beginning, according to the structure of radar communication system, this paper designs the communication flow between transmitter and receiver, and then discusses the theoretical foundation and key technology of spread spectrum communication. According to the actual situation of radar communication system, the spread spectrum mode, spread spectrum code and synchronization mode are selected. Then, according to the requirements of the system, a hardware platform based on spartan-6FPGA is designed. Then it discusses how to complete the communication flow and restore information with ISE software platform and VHDL language on this hardware platform. The system uses m sequence to spread spectrum directly, and transmits information through 2DPSK modulation. The receiver uses differential coherent demodulation, matched filter despreading and CFAR decision to recover information. Finally, the hardware debugging results observed by oscilloscope and chipscope are compared with the simulation results of MATLAB modelsim. The correctness of the system flow design, hardware platform construction and software algorithm is verified in this paper, and the aim of real-time communication is achieved.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51

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