The article is devoted to the substantiation of the approach to increasing the radar's resolving power in range by inverse filtering (IF).

Since it is known that without signal selection from background noise, the IF it is not effective for resolution, it is proposed to apply it with regularization. As a threshold limitation of relevant signal spectrum is chosen the parameter of regularization. The regularization is achieved by gain of quasiinverse filter solving in relevant of chosen parameter value. Such filter reduces the resolution objectives in compression with inverse filter, but allows to increase of correct resolution probability (CRP). The estimates of CRP in depend on SNR, with obtained by inverse filtration with regularization (IFR). It is shown, that using of IFR allows increase of radar resolution capabilities with the simple radio pulse is four times when SNR from 18–25 dB.