圆阵雷达的信号处理设计与实现

发布时间：2018-05-05 00:04

本文选题：阵列雷达 + 信号处理　；参考：《南京理工大学》2015年硕士论文

【摘要】：圆阵雷达作为相控阵雷达的一种形式,具有全方位多波束、大数据量的特点,对信号处理提出了很高的要求。而FPGA的高速发展使得其在处理规模和速度方面都具有极大的优势,从而在雷达信号处理中占据了重要地位。本文结合雷达系统应用背景,探讨了一种基于Xilinx最新一代FPGA Virtex-7的雷达信号处理方案。本文对于信号处理系统的研究是按照从理论验证到硬件设计,再到软件实现,最后到系统联调的顺序进行的。首先,选择线性调频宽、窄脉冲复合信号以兼顾雷达对远、近距离目标的探测能力,给出基于多通道脉冲压缩和MTD的信号处理方案,并讨论距离旁瓣抑制以及远、近距离门拼接的问题,给出系统级的MATLAB仿真,为工程实现提供理论支持。然后,在进行了需求分析的基础之上,给出信号处理板的总体设计方案,采用Virtex-7作为核心处理器,围绕它进行各模块电路设计,包括FPGA配置电路、存储系统、D/A电路、电源系统以及时钟系统的设计。随后,讨论了信号处理在FPGA中的实现,包括FFT、IFFT、复数乘法等具体算法以及数据无缝缓冲和拼接的实现,针对雷达多种工作模式给出兼容处理方案,分析了时间及硬件资源,并利用Modelsim和MATLAB进行了联合仿真及精度分析。最后,对硬件平台进行系统调试,给出了时钟系统、存储系统以及D/A电路的调试结果,通过在线调试工具ChipScope对FPGA实际信号处理结果进行分析及验证。本文所研究的基于FPGA的信号处理系统在时间资源、硬件资源以及实时性、正确性上都满足了阵列雷达信号处理的要求,为以后的进一步研究提供了技术积累。
[Abstract]:As a kind of phased array radar, circular array radar has the characteristics of omnidirectional multi-beam and large amount of data. With the rapid development of FPGA, it has a great advantage in processing scale and speed, so it plays an important role in radar signal processing. Based on the background of radar system application, a radar signal processing scheme based on the latest generation FPGA Virtex-7 of Xilinx is discussed in this paper. In this paper, the research of signal processing system is carried out according to the sequence from theoretical verification to hardware design, software implementation, and finally to the system combination. Firstly, the signal processing scheme based on multi-channel pulse compression and MTD is presented, and the range sidelobe suppression and the distance sidelobe suppression are discussed. The system level MATLAB simulation is presented to provide theoretical support for engineering implementation. Then, based on the requirement analysis, the overall design scheme of the signal processing board is given. The Virtex-7 is used as the core processor, and every module circuit is designed around it, including the FPGA configuration circuit, the storage system D / A circuit. Design of power system and clock system. Then, the realization of signal processing in FPGA is discussed, including the implementation of FFTFT-IFFTFT, complex multiplication and seamless data buffering and splicing. The compatible processing scheme is given for various working modes of radar, and the time and hardware resources are analyzed. The joint simulation and precision analysis are carried out by Modelsim and MATLAB. Finally, the hardware platform is debugged, and the debugging results of clock system, storage system and D / A circuit are given. The actual signal processing results of FPGA are analyzed and verified by on-line debugging tool ChipScope. In this paper, the signal processing system based on FPGA meets the requirements of array radar signal processing in terms of time resources, hardware resources and real-time, and provides a technical accumulation for further research.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN957.51

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