双通道伪随机编码超宽带探地雷达主控机设计  

Design of a pseudo-random coded ultra-wideband dual-channel ground penetrating radar controller

作　　者：贺靖 周斌 方广有[1,2,3] He Jing;Zhou Bin;Fang Guangyou(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;Key Laboratory of Electromagnetic Radiation and Detection Technology,Chinese Academy of Sciences,Beijing 100190,China;School of Electronics,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院电磁辐射与探测技术重点实验室,北京100190 [3]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《电子测量技术》2022年第11期1-9,共9页Electronic Measurement Technology

基　　金：国家重点研发计划项目(2020YFC1522200);国家重点研发计划项目(2020YFC1522202-4);国家自然科学基金(41941002)项目资助。

摘　　要：为实现探地雷达小型化和数字化的设计,对伪随机编码探地雷达的系统设计方案进行了研究。研制了一款双通道伪随机编码超宽带探地雷达主控机。研究基于FPGA芯片Virtex-5和宇航级ADC芯片ADS5463-SP,采用码元平衡直发的信号源设计方案,配合混合采样实现了中心频率60 MHz和800 MHz的双通道格雷互补码编码信号的发射和接收。进行了信号源测试实验和主控机的闭环测试实验,双通道脉冲压缩结果峰值旁瓣比均大于25 dB,并达到了低频1.875 m和高频11.72 cm的距离分辨率。将主控机接入雷达系统,在沙坑中进行雷达整机的高频通道测试实验,测得埋藏大理石板厚度约17 cm。结果表明本文设计的雷达主控机性能可靠,可以广泛应用于伪随机编码体制超宽带探地雷达系统。In order to realize the miniaturization and digitization design of ground penetrating radar(GPR), this paper studies the design of pseudo-random(PRN) coded GPR system. A dual-channel pseudo-random coded ultra-wideband(UWB) GPR controller is presented in this paper. A dual-channel golay complementary pairs coded signal with a center frequency of 60 MHz and 800 MHz is transmitted and received by using the symbol balanced direct transmission signal source design based on the Virtex-5 and space-level ADC chip ADS5463-SP. The signal source test and the closed-loop test of the controller are carried out. The peak sidelobe ratios of the two-channel pulse compression results are greater than 25 dB, and the distance resolution of 1.875 m in low frequency and 11.72 cm in high frequency is achieved. The controller is connected to the radar system, and the high frequency channel test is carried out in a sand pit. The thickness of the buried marble slab is measured to be about 17 cm. The results show the performance of the radar controller designed in this paper is reliable, and it can be widely used in the PRN UWB GPR system.

关 键 词：超宽带 探地雷达 FPGA 伪随机编码 格雷互补码 脉冲压缩 

分 类 号：TN95[电子电信—信号与信息处理]