A deterministic method to increase vertical resolution of GPR data is proposed, based on spectral balancing in t-f domain. Taking advantage of the variation of time and frequency resolution of S-transform, GPR signals can be balanced and de-noised after the selection of a time-variant bandwidth. The algorithm is fast, since it involves one FT and two IFTs for each trace. The proposed methodology was applied on a synthetic trace and real GPR data from a sandbox experiment, revealing reflections, which were not clearly visible after conventional processing. Additionally, weak reflections present in the spectrally balanced GPR section, are attributed to the interface between the water - oil mixture zone and the water zone.


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