Patent RU-2523031-C2 (RU)
Inventor: SEMENOV VIKTOR LEONIDOVICH
IPC: F41H11/02
Filed: 2011-10-05
Granted: 2014-07-20
Abstract: FIELD: physics, navigation. 
     SUBSTANCE: group of inventions relates to radio engineering. The method includes determining defensive ordnances to be launched, launch and detonation time thereof, ordnances integrated with a radar station after detecting and determining the moment the radar station detects a signal at differential frequency Fdo=2Vofn/C, where fn is frequency of the emitted chirp signal, Vo and C denote the velocity of the last third defensive ordnance and the speed of light, corresponding to the launch time of the last defensive ordnance to the third deflection point closest to the radar station, wherein the radar station first determines the time of onset of signals at differential frequencies (N+4)Fdo and NFdo, when the target is located at (Do/Vo)[Vi+(N+4)Vo] and (Do/Vo)(Vi+NVo) from the receiving-transmitting antenna of the radar station, respectively, where N is a positive number, Vi is the radial velocity of the target, Do is the distance from the receiving-transmitting antenna of the radar station to the third deflection point, selected based on the condition Do/Vo=fn/Fmfd, where fd and Fm denote frequency deviation and modulation frequency of the chirp signal; determining the time of onset of signals at differential frequencies (N+4)Fdo and AFdo, when the target is located at (Do/Vo)[Vi+(N+4)Vo] and (Do/Vo)(Vi+AVo) from the receiving-transmitting antenna of the radar station, respectively, where A is a positive number considerably less than N, and measuring first the time interval t between the onset of signals at differential frequencies (N+4)Fdo and NFdo, then, in accordance with the duration of the time interval t, selecting two values from a plurality of predetermined values: Di=(Do/Vo)(Vi+NVo) - range and (Vi+Vp 1 ) - sum of velocities, where Vp 1  is the velocity of the first defensive ordnance, and calculating the relationship t 1 =Di/(Vi+Vp 1 ), which determines the time between the launch of the first defensive ordnance when the target is located at a distance of (Do/Vo)(Vi+NVo) from the receiving-transmitting antenna of the radar station and the time of detonation of the first defensive ordnance, when the ordnance is located at a deflection point furthest from the radar station - point of meeting the target, and then measuring the time interval t 2  between the onset of signals at differential frequencies (A+4)Fdo and AFdo, then, in accordance with the duration of the measured time interval t 2 , selecting two values from a plurality of predetermined values: Di=(Do/Vo)(Vi+AVo) and (Vi+Vp 2 ), where Vp 2  is the velocity of the next second defensive ordnance, and calculating the relationship t 3 =Di/(Vi+Vp 2 ), which determines the time between the launch of the second defensive ordnance when the target is located at a distance (Do/Vo)(Vi+AVo) from the receiving-transmitting antenna of the radar station and the time of detonation of the second defensive ordnance, when the ordnance is located at a second deflection point closer to the radar station. The apparatus for determining defensive ordnance to be launched and the launch and detonation time thereof includes: an antenna, a chirp signal transmitter, a mixer, a differential frequency filter, a narrow-band signal detector, a shift register, two AND elements, an OR element, two delay elements, two pulse counters, a count pulse generator, two divider circuits, four read-only memory devices and two time switches. 
     EFFECT: high effectiveness of protecting objects, which is achieved owing to use of multiple classes of defensive ordnances, each fired at the right time and detonating at a defined deflection point. 
     2 cl, 1 dwg