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Wang, Shilei (author), Liu, Guixian (author), Jing, Guoqing (author), Feng, Qiankuan (author), Liu, Hengbai (author), Guo, Y. (author)In the past 20 years, many studies have been performed on ballast layer inspection and condition evaluation with ground penetrating radar (GPR). GPR is a non-destructive means that can reflect the ballast layer condition (fouling, moisture) by analysing the received signal variation. Even though GPR detection/inspection for ballast layers has...review 2022