Abstract: Using multi-frequency array Ground Penetrating Radar (GPR) to detect defects in launch site pavements can obtain target information at different depths and resolutions. However, the vast amount of data generated by multi-frequency array GPR and the inability to merge data from different frequencies pose challenges for imaging and anomaly interpretation. To address this issue, a real-time imaging method for multi-frequency array GPR data is proposed, which utilizes ray projection in both depth and channel directions to more comprehensively display information on underground anomalies at different depths. The processing results of measured data indicate that this method effectively retains the basic information of underground anomalies, achieving rapid and high-precision display, thus meeting the application requirements for the rapid detection of defects in launch site pavements.

Key words: Ground Penetrating Radar (GPR), Launching site detection, Ray casting