The basic phenomenon, which has been used as a basis to detect the launch of missiles, is a reflection of short radio waves with a large radar cross section (EPR) from the expanding flow of partially ionized propellant combustion products at ionospheric altitudes of 100-300 kilometers (130 sec. Of flight time). During these experiments, it was established that using a narrow (in elevation) the transmission beam, pressed as close to the horizontal part of the radiated energy can enter the channels in the ionosphere when they are excited by refraction. There were also identified other excitation sliding dissemination mechanisms, including large-scale irregularities in the refraction and diffusion of beams at random ionospheric irregularities. Distribution sliding mechanism defined the basic features of the use of the first generation of Soviet radars MH. Sufficient experimental findings specifically planned missile launches were conducted at 3 and 6 th. Km. It should be noted that Nicholas-horizon radar was experimental, so that all types of events and spreads thoroughly studied.