1. A method of estimating properties of a subsurface formation, the method comprising: obtaining a first lookup table by using a first excitation current pulse transmitting a second excitation current pulse into the formation, the second excitation current pulse being a different shape of excitation current pulse than the first excitation current pulse; receiving an induced pulse used to generate input data; modifying the first lookup table to generate a second lookup table specific to the second excitation current pulse; performing an inversion on the input data using the second lookup table to estimate the properties of the subsurface formation; and performing geo-steering in the subsurface formation based on the properties.