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Ground Penetrating Radar (GPR) is widely used to acquire the data from near surface depth. Acquired GPR data allow the users to investigate the underground structures (anomalies) easily, quickly and with high accuracy without any excavation. The obtained accuracy depends on the completeness of acquired GPR data. Due to some facts such as uneven surface, the presence of archaeological and other obstacles, etc., the data acquired from the search area may become incomplete and inadequate. Before analyzing, visualization and interpretation of the underground structures, the incomplete GPR data should be recovered. In this paper, two nonstandard interpolation techniques are proposed for completing the missing data. The proposed methods were implemented on the real GPR data acquired from the test area. The obtained results showed that the similarity of the produced data to the original data is …