软件无线电若干关键技术研究及实现
发布时间：2018-08-13 14:06
【摘要】：软件无线电技术在无线通信领域应用广泛，是近几年的热点研究话题。本文结合实验室承担的国家十二五规划项目“液体安全性无损检测”和关于雷达信号处理的国防项目，研究了软件无线电技术中的一些关键技术，讨论了危险液体无损检测系统中数字下变频关键技术、数字基带信号的瞬时相位提取以及国防科技项目中关于雷达信号杂波图处理等问题。 射频接收的模拟信号经过A/D采样之后的信号具有较高的频率，不便于数据处理，而数字下变频技术能够将高速高频率的信号进行降频和抽取，获得较低的采样速率，有助于后续的基带数据处理。本研究重点讨论了数字下变频技术的优化，运用数控振荡器和乘法器实现混频技术，并运用CIC滤波器实现抽取，，省去了后续半带滤波器和FIR滤波器模块，并利用ModelSim和MATLAB对设计进行仿真和数据分析。并在ALTERA公司的EP2S90F1090I4上进行验证试验，试验表明本文中所采用的优化的方法是可行的，不仅能提高运算效率，而且大大节约硬件资源。 基带数据处理涉及到数据处理算法和系统资源、速度等的优化，也是近几年软件无线电技术的热点。结合危险液体无损检测系统，研究了对基带信号的瞬时相位的提取，重点讲述了运用CORDIC算法求取瞬时相位，并对误差较大的盲点进行修正。运用MATLAB对算法进行理论分析，然后仿硬件的处理方式进行设计实现，仿真分析数据运算误差并进行修正，然后进行代码设计和FPGA实现，并运用signaltap抓取数据，分析数据误差，实验选用ALTERA公司的cyclone IV系列FPGA设计，实验证明数据误差均在0.5度要求的范围之内，并且时钟频率在150Mhz以上，随后进行系统的优化，节约资源并且将时钟频率提高到200Mhz以上，性能较好，达到设计要求。 国防项目中雷达杂波图信号处理系统重点研究了杂波图处理系统的各个模块的FPGA实现，根据项目要求，重点讲述了数据乒乓缓存、数据包扇区更新时的杂波图迭代运算，扇区不更新时对同扇区数据选大或平均处理以及背景数据的扩展回传等问题。并在xilinx公司的virtex-II pro上进行FPGA验证，分析了实验结果，表明设计正确。
[Abstract]:Software radio technology is widely used in the field of wireless communication, which is a hot topic in recent years. In this paper, some key technologies in software radio technology are studied in combination with the national non-destructive testing of liquid safety and the national defense project on radar signal processing, which is the 12th Five-Year Plan Project undertaken by the laboratory. This paper discusses the key techniques of digital downconversion in the NDT system of dangerous liquids, the instantaneous phase extraction of digital baseband signals, and the clutter map processing of radar signals in the national defense science and technology project. The analog signals received by RF have a high frequency and are not easy to process data because of the high frequency after Ar / D sampling. The digital downconversion technology can decimate and decimate the signals of high speed and high frequency to obtain a lower sampling rate. Facilitate subsequent baseband data processing. This study focuses on the optimization of digital down-conversion technology, the use of numerical control oscillator and multiplier to achieve mixing technology, and the use of CIC filter to achieve decimation, eliminating the follow-up half-band filter and FIR filter module, The design is simulated and analyzed by ModelSim and MATLAB. The experimental results on EP2S90F1090I4 of ALTERA Company show that the optimization method is feasible and can not only improve the efficiency of operation, but also save the hardware resources greatly. Baseband data processing involves the optimization of data processing algorithms, system resources, speed and so on. It is also a hot topic in software radio technology in recent years. Combined with the dangerous liquid nondestructive testing system, the extraction of instantaneous phase of baseband signal is studied. The CORDIC algorithm is used to calculate the instantaneous phase, and the blind spot with big error is corrected. The algorithm is analyzed theoretically by MATLAB, then designed and implemented by the processing mode of imitation hardware, the error of data operation is analyzed and corrected by simulation, then the code design and FPGA implementation are carried out, and the data error is analyzed by using signaltap to capture data. The design of cyclone IV series FPGA made by ALTERA Company is used in the experiment. The experiment proves that the error of data is within the range of 0.5 degree and the clock frequency is above 150Mhz. Then the system is optimized, the resource is saved and the clock frequency is raised above 200Mhz. Good performance, meet the design requirements. In the national defense project, the radar clutter map signal processing system focuses on the FPGA implementation of each module of the clutter map processing system. According to the requirements of the project, the paper focuses on the iterative operation of the clutter map when the data ping-pong cache and the data packet sector are updated. When the sector is not updated, the data of the same sector is selected or processed in average and the background data is extended back. FPGA verification is carried out on the virtex-II pro of xilinx Company, and the experimental results show that the design is correct.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92
本文编号：2181213
[Abstract]:Software radio technology is widely used in the field of wireless communication, which is a hot topic in recent years. In this paper, some key technologies in software radio technology are studied in combination with the national non-destructive testing of liquid safety and the national defense project on radar signal processing, which is the 12th Five-Year Plan Project undertaken by the laboratory. This paper discusses the key techniques of digital downconversion in the NDT system of dangerous liquids, the instantaneous phase extraction of digital baseband signals, and the clutter map processing of radar signals in the national defense science and technology project. The analog signals received by RF have a high frequency and are not easy to process data because of the high frequency after Ar / D sampling. The digital downconversion technology can decimate and decimate the signals of high speed and high frequency to obtain a lower sampling rate. Facilitate subsequent baseband data processing. This study focuses on the optimization of digital down-conversion technology, the use of numerical control oscillator and multiplier to achieve mixing technology, and the use of CIC filter to achieve decimation, eliminating the follow-up half-band filter and FIR filter module, The design is simulated and analyzed by ModelSim and MATLAB. The experimental results on EP2S90F1090I4 of ALTERA Company show that the optimization method is feasible and can not only improve the efficiency of operation, but also save the hardware resources greatly. Baseband data processing involves the optimization of data processing algorithms, system resources, speed and so on. It is also a hot topic in software radio technology in recent years. Combined with the dangerous liquid nondestructive testing system, the extraction of instantaneous phase of baseband signal is studied. The CORDIC algorithm is used to calculate the instantaneous phase, and the blind spot with big error is corrected. The algorithm is analyzed theoretically by MATLAB, then designed and implemented by the processing mode of imitation hardware, the error of data operation is analyzed and corrected by simulation, then the code design and FPGA implementation are carried out, and the data error is analyzed by using signaltap to capture data. The design of cyclone IV series FPGA made by ALTERA Company is used in the experiment. The experiment proves that the error of data is within the range of 0.5 degree and the clock frequency is above 150Mhz. Then the system is optimized, the resource is saved and the clock frequency is raised above 200Mhz. Good performance, meet the design requirements. In the national defense project, the radar clutter map signal processing system focuses on the FPGA implementation of each module of the clutter map processing system. According to the requirements of the project, the paper focuses on the iterative operation of the clutter map when the data ping-pong cache and the data packet sector are updated. When the sector is not updated, the data of the same sector is selected or processed in average and the background data is extended back. FPGA verification is carried out on the virtex-II pro of xilinx Company, and the experimental results show that the design is correct.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92
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