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Accurate monitoring of tree roots using ground penetrating radar (GPR) isvery useful in assessing the trees health. In high moisture tropical areas suchas Singapore, tree fall due to root rot can cause loss of lives and properties.The tropical complex soil characteristics due to the high moisture contenttends to affect penetration depth of the signal. This limits the depth range ofthe GPR. Typically, a wide band signal is used to increase the penetrationdepth and to improve the resolution of the GPR. However, this broad bandfrequency tends to be noisy and selective frequency filtering is required fornoise reduction. Therefore, in this paper, we adapt the stepped frequencycontinuous wave (SFCW) GPR and propose the use of a Joint time frequencyanalysis (JTFA) method called short time Fourier transform (STFT), to reducenoise and enhance tree root detection. The proposed methodology is illustratedand tested with controlled experiments and real tree roots testing. The resultsshow promising prospects of the method for tree roots detection in tropicalareas.

SFCW GPR tree roots detection enhancement by time frequency analysis in tropical areas