  A lightning mapping system based on perpendicular crossed baseline
interferometer (ITF) technology has been developed rapidly in recent years.
Several processing methods have been proposed to estimate the temporal location
and spatial map of lightning strikes. In this paper, a single very high
frequency (VHF) interferometer is used to simulate and augment the lightning
maps. We perform a comparative study of using different processing techniques
and procedures to enhance the localization and mapping of lightning VHF
radiation. The benchmark environment involves the use of different noise
reduction and cross-correlation methods. Moreover, interpolation techniques are
introduced to smoothen the correlation peaks for more accurate lightning
localization. A positive narrow bipolar event (NBE) lightning discharge is
analyzed and the mapping procedure is confirmed using both simulated and
measured lightning signals. The results indicate that a good estimation of
lightning radiation sources is achieved when using wavelet denoising and
cross-correlations in wavelet-domain (CCWD) with a minimal error of 3.46
(degrees). The investigations carried out in this study confirm that the ITF
mapping system could effectively map the lightning VHF radiation source.
