A real-time correction method based on time-varying zero offset for the equivalent sampling of ground penetrating radars
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摘要: 探地雷达系统的温漂现象、有耗媒质的低通效应以及天线与地面间耦合性的下降会导致回波变形,使有效雷达回波与零偏分量混叠,不利于弱小信号检测。传统的前端修正方法和后处理方法,旨在提高发射效率,去除杂波噪声,并未改善系统的信噪比和灵敏度。因此,该文采用时变零偏实时校正方法对等效采样电路进行改进,单独控制每个采样的零偏系数,并且每次采样实时更新叠代,避免将直流、低频成分与有效信号同时送入后续程控放大电路,保证了弱信号的正确采集及系统的动态范围。实验验证了该方法的有效性及可行性,已应用于新型号数字化探地雷达产品。Abstract: Echoes can be distorted due to the temperature drift of the ground penetrating radar (GPR) system,the low-pass effect of lossy media,and the decline in the coupling between the antenna and the ground.The mixing of effective radar echoes and zero-offset components makes it difficult to detect weak signals.The conventional front-end correction and post-processing methods,which aim to improve the transmission efficiency and remove the clutter noise,fail to improve the signal-to-noise ratio (SNR) and sensitivity of the system.To overcome these obstacles,this study improved the equivalent sampling circuit using a real-time correction method based on time-varying zero offset.Specifically,the zero-offset coefficient of each sampling was controlled separately and was updated in real time on each sampling.No DC and low-frequency components were sent into the subsequent programmable amplifier along with effective signals,ensuring the correct acquisition of weak signals and the dynamic range of the system.Experiments have proved the validity and feasibility of this method,which has been applied to a new type of digital GPR product.
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