Patent RU-2486537-C2 (RU)
Inventor: KUPRJASHKIN IVAN FEDOROVICH
IPC: G01S7/38
Filed: 2011-08-03
Granted: 2013-06-27
Abstract: FIELD: radio engineering, communication. 
     SUBSTANCE: apparatus for distorting the radar image of an object consists of N-channel receiving and transmitting antenna arrays, wherein each of the N channels contains a receiving antenna array component, series-connected controlled phase changer, controlled amplifier and a transmitting antenna array component, the apparatus being characterised by that each of the N channels includes a band-pass filter, first and second phase detectors, first and second analogue-to-digital converters, a computer, first, second and third digital-to-analogue converters a mixer, as well as a reference generator, a phase changer, first and second memory devices, a device for determining the direction of a radio source, a device for calculating the current scattering cross-section value of the object and a device for inputting information on the spatial position of the object, wherein outputs of the first memory device and the device for calculating the current scattering cross-section value of the object are respectively connected to the third and fourth inputs of computers of each channel; the output of the reference generator is connected to the second input of the first phase detector, the second input of the mixer and through the phase changer to the second inputs of the second phase detectors of each channel, wherein each n-th output, where n=1, 2, …, N, of the receiving antenna array is connected to the corresponding input of the device for determining the direction of a radio source and through the band-pass filter to the first inputs of the first and second phase detectors of the corresponding channel; the output of the device for determining the direction of a radio source is connected to the first input of the device for calculating the current scattering cross-section value of the object; outputs of the second memory device and the device for inputting information on the spatial position of the object are connected to the second and third inputs of the device for calculating the current scattering cross-section value of the object; outputs of the first and second phase detectors are connected through corresponding analogue-to-digital converters to corresponding inputs of the computer of the corresponding channel, the first, second and third outputs of which are connected to inputs of corresponding digital-to-analogue converters; the output of the second digital-to-analogue converter is connected to the first input of the mixer, the output of which is connected through the controlled phase changer to the first input of the controlled amplifier; the second input of the controlled phase changer is connected to output of the third digital-to-analogue converter; the second input of the controlled amplifier is connected to the output of the first digital-to-analogue converter of that channel. 
     EFFECT: ensuring the constant lowest probability of correct detection of an object D cd  for any conditions of generating radar images in a synthetic aperture antenna by distorting radar images of the object with relayed response. 
     4 dwg