双通道伪随机编码超宽带探地雷达主控机设计

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。该文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60MHz和800MHz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25dB，并达到了低频1.875m和高频11.72cm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17cm。结果表明该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。

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

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 60MHz and 800MHz 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 25dB, and the distance resolution of 1.875m in low frequency and 11.72cm 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 17cm. 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.