I.F. Lozovsky

The task of incoherent radar signals with linear frequency modulation pulse packet in conditions of impulse noise (IN) and fluctuation noise influence is examined. Dependencies of signals parameters at the output of processing system from IN characteristics with by power distinguished range elements censoring are researched. For signal processing in IN conditions it is suggested to use the system consisted of the noise power estimations censor, matched filter and incoherent accumulator with noise power normalizing. It is shown that side lobes level (SLL) of compressed signals may be reduced on scores dB and resulted in practice to the nominal level without IN in conditions of unsynchronized IN with weighting processing in the matched filter (MF). Statistical characteristics of systems with IN censoring are compared with parameters of known systems with incoherent signals amplitude, normalized to noise power estimations in every sounding period, and accumulation. Obtained results show that in systems with IN censoring up MF the probability of false alarm in IN conditions is low increased (up to 1 order), threshold signal values are also near of the nominal level. In this time in systems without IN censor up MF the number of false alarm is noticeably increased ( with nominal level of ) and the value of threshold signal is grown (increase up to ~10-15dB).