Analysis of options to target detection with reduced reflective surface

Information sources for long-range passive surveillance systems (PSS) are especially radio signals from active onboard aircraft systems or more generally flying airborne objects. Due to the physical possibilities for detection are for contemporary PSS real source of information signal shipboard radars, navigation interrogators, identification transponders, jammers and means of data transfer (Data Links). The development of aircraft is mainly focused on the real using of technologies, known collectively as STEALTH, to reduce the effective reflective surface radar aircraft, which is decisive for the detection of range to targets while reducing radio emission targets. In this category we find also Low-dimensional air targets - UVA (Unmanned Aerial Vehicle), UCAV (Unmanned Combat Air Vehicle) and other targets that have minimal reflective surface have given its geometrical dimensions. This article is focused on the analysis of signals of objects of interest in terms of their origin. There are two main groups of sources. Firstly, primary actively generated airborne signals (radar, navigation, identification, jamming, data and communication) and secondarily emitted signals generating due to reflection and scattering of the incident to the performance of the air target asynchronously or synchronously operating terrestrial or airborne transmitters.