噪声SAR信号产生与数据采集

发布时间：2018-07-03 16:20

本文选题：合成孔径雷达 + 线性调频　；参考：《南京理工大学》2017年硕士论文

【摘要】：合成孔径雷达是一种高分辨率的成像雷达,它具有全天候、全天时、实时获取远距离、大区域图像的能力,现已广泛应用于军事及民用领域。而随机噪声信号雷达具有低截获概率特性、电子反对抗能力、电磁兼容性和无模糊测距测速等十分突出的优势。因此,随机噪声合成孔径雷达能更有效地发挥作用。本论文围绕宽带噪声合成孔径雷达信号产生与数据采集进行了研究。本文根据宽带噪声合成孔径雷达性能需求和技术参数设计了软硬件实现方案,给出了结构框图和工作流程。分析并仿真了线性调频、噪声调频的带宽、分辨率及模糊函数性能。结合硬件实现平台,给出用多个DDS(直接数字式频率合成器)并行交叉数据产生线性调频信号的方案,以及用线性反馈移位寄存器、中心极限定理累加法及DDS产生噪声调频信号的方法。本文基于FPGA平台,结合高速数模转换器AD9739,产生了宽带线性调频信号和噪声调频信号并通过微波发射。同时利用高速ADC12D1800采集雷达回波数据至FPGA后,通过高速传输接口(PCIE)存储至上位机。最终,对整个雷达系统进行硬件调试与验证。通过对采集到的数据进行处理分析,得到成像结果,验证雷达系统工作性能良好,表明了雷达信号产生与数据采集方案的可行性。
[Abstract]:Synthetic Aperture Radar (SAR) is a kind of high resolution imaging radar. It has the ability of real-time acquisition of long distance and large area images all weather, all day, and has been widely used in military and civil fields. The random noise radar has many advantages such as low probability of interception, electronic resistance, electromagnetic compatibility and non-fuzzy ranging and velocimetry. Therefore, random noise synthetic aperture radar can play a more effective role. In this paper, the signal generation and data acquisition of wideband noise synthetic aperture radar (SAR) are studied. According to the performance requirements and technical parameters of wideband noise synthetic aperture radar, the hardware and software implementation scheme is designed, and the structure block diagram and work flow are given. The bandwidth, resolution and ambiguity function performance of LFM and noise FM are analyzed and simulated. Combined with the hardware implementation platform, the scheme of generating LFM signal with multiple DDS (Direct Digital Frequency synthesizer) parallel cross data and linear feedback shift register is given. The accumulative method of central limit theorem and the method of generating noise frequency modulation signal by DDS. Based on FPGA and AD9739, wideband linear frequency modulation (LFM) signal and noise FM signal are generated and transmitted by microwave. At the same time, high speed ADC12D1800 is used to collect radar echo data to FPGA, and then stored to host computer through high speed transmission interface (PCIE). Finally, the whole radar system hardware debugging and verification. Through processing and analyzing the collected data, the imaging results are obtained, and the good performance of radar system is verified, which shows the feasibility of radar signal generation and data acquisition scheme.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN958

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