Analysis of Low Probality of Intercept radar performance versus boarded passive sensors of eletronic warfare

Abstract

This paper brings a study about the measurement of the risks of LPI (Low Probability of Intercept) radars against passive sensors of Electronic Warfare. Currently, such radars represent the “state of the art” of electromagnetic combat and are increasingly attracting attention from opponent’s equipment. This type of radar commonly uses intrapulse modulation techniques wich can turn transmissions into ones really stealth, with radar scope and resolution quite optimized. The counterpoint to passive sensors is justified by the fact that a priori such equipment has a distance detection advantage if compared to radar equipment and therefore they are quite widespread as stand-off platforms. The theoretical analysis of the article rests on the concepts of intrapulse modulation of the LFM type (Linear Frequency Modulation) and the radar / passive sensor equations. Simulations were also conducted on distance loss detection aspects, taking into account some scenarios in which variation of radar and passive sensor parameters are included. The result of the analysis allowed to confirm how a LPI radar could become.an equipment of extreme value in a theater of operations and how much attention Brazilian Armed Forces must pay regarding the advent of such devices.