51 results about "Electronic counter-countermeasures" patented technology

The invention relates to the technical field of radar electronic countermeasures, and discloses a single-pulse tracking and guiding radar coherent jamming method based on target range profile template matching. The method is characterized in that frequency domain response of an all-attitude angle target is established on an operating frequency of a typical airborne single-pulse tracking and guiding radar, and database construction of an all-attitude angle extended target range profile is completed; parameter measurement, feature extraction and signal reconstruction are carried out on radar signals when a ship-borne electronic support measure (ESM) reconnaissance system reconnoiters transmitting signals of the airborne tracking and guiding radar; a ship-borne jammer carries out matching processing on reconstructed signals and scattering properties of a protected target, additional phase shift and time delay parameters are set, and jamming signals which have a stable phase relation with target echoes are generated. The single-pulse radar coherent jamming method is applicable to jamming devices on various platforms of ships, airplanes and the like, a self-defense electronic jamming ability is provided in allusion to an extended target, and the single-pulse tracking and guiding radar is enabled to create a good angle deception jamming effect.

A tactical radio includes a radio frequency (RF) processing module having a receiving component path and a transmitting component path. A signal processing module coupled to the RF processing module includes a jammer detection stage for identifying a type of jamming signal on a channel over which communications signals are received simultaneously. A jammer model stage in the signal processing module produces a waveform model for the jamming signal, and a channel model stage replicates propagation conditions on the channel and produces a corresponding cancellation signal. The cancellation signal is coupled at such a level into the receiving component path so as to cancel the jamming signal from received communications signals at the front end of the radio. Any residual jamming signals may then be removed by a secondary jamming cancellation stage operating at baseband.

The invention relates to a terahertz sensor, in particular to a graphene nanoribbon array terahertz sensor based on optical waveguide. The graphene nanoribbon array terahertz sensor comprises a bottom grid, a low-resistivity silicon substrate, a lower insulation layer, a graphene nanoribbon array, a source leak electrode, an upper insulation layer, a top grid, an optical waveguide structure, an incidence coupling raster, an emitting coupling raster and a driving circuit, wherein the lower insulation layer, the graphene nanoribbon array, the source leak electrode, the upper insulation layer, the top grid, the optical waveguide structure, the incidence coupling raster, the emitting coupling raster and the driving circuit are arranged on the substrate; the graphene materials have the photoelectric characteristics of high carrier mobility, electronic scattering-free transmission and adjustable energy gap and adopt the graphene nanoribbon and p-i-n photoelectric detecting structure. By means of characteristics of collection, transmission and gathering of the optical waveguide, and the composite structure of the large-area optical waveguide and the graphene nanoribbon array is designed. The terahertz sensor has the advantages of high light energy utilization rate, high sensitivity, fast response, simple operation and structure at the room temperature, convenience in integration and small size, can be widely applied to the fields of security check, drug smuggling investigation, counter terrorism, medical imaging, nondestructive testing, electronic countermeasures, radar, remote sensing, outer space wideband communication and the like.

The invention provides an electronic countermeasure simulation system, which comprises a signal generation module. The signal generation module is used for generating a pulse description word data stream according to received scene parameters and outputting the pulse description word data stream for signal simulation. Through using the pulse description words to describe basic features of radio frequency pulses, a complex and changeable battlefield electromagnetic environment can be described thoroughly, features of aspects such as a time domain, a frequency domain and airspace of the electromagnetic environment can be described, and needs of simulating the complex battlefield electromagnetic environment by electronic countermeasure simulation can be met.

The invention discloses a relativistic magnetron for realizing a frequency hopping operation by utilizing a transparent negative electrode, and belongs to the technical field of electronic countermeasure. The relativistic magnetron comprises a shell, a co-cavity structured positive electrode, a magnetron resonant cavity, the transparent negative electrode consisting of a plurality of sector negative electrodes, a tuning unit and an energy coupling output apparatus. According to the relativistic magnetron, the conventional columnar negative electrode is designed into the sector transparent negative electrode; the mode conversion between a pi mode and a 2pi mode is realized by changing the relative angle between the negative electrode fan-shaped emitting surface and the fan-shaped resonant cavity; when the relative angle between the negative electrode emitting surface and the fan-shaped resonant cavity is changed, the static electric field distribution between the negative electrode and the positive electrode is changed accordingly; meanwhile, the initial phase position of an electron beam relative to a resonant mode high frequency field is affected as well; therefore, when the negative electrode is rotates, the working mode of the relativistic magnetron is changed along with the change of the relative angle between the negative electrode emitting surface and the fan-shaped resonant cavity so as to fulfill the purpose of changing the frequency agility.

The invention discloses a novel multi-channel electronic reconnaissance and electronic countermeasure integrated device and method. The device includes a high-performance signal processing module, a high-performance signal analysis module and a magnetic disk array; the high-performance signal processing module is mainly used for preprocessing signals to be reconnoitered so as to obtain signals tobe analyzed; the high-performance signal analysis module is used for performing spectrum analysis and parameter estimation on the signals to be analyzed so as to obtain information of interest, and generating alarm signals according to the information of interest; the magnetic disk array is used for storing the signals to be analyzed and the information of interest; and the high-performance signalprocessing module is used for receiving the signals to be analyzed and the information of interest read back from the magnetic disk array by the high-performance signal analysis module, and generating interference signals accordingly. The device promptly performs early warning after performing pre-processing and spectrum analysis on the intercepted signals, and generates the interference signalsat the same time, thereby interfering with the equipment of enemies, and quickly attacking the electronic equipment of the enemies.

The invention relates to the technical field of electronic countermeasures radio frequency stimulation, and discloses electronic countermeasures radio frequency artificial antenna array equipment and a feed control method. The equipment adopted in the method is connected with the input end of a power combiner through a plurality of feed control circuits connected with radio frequency signals, and a plurality of channels of the first part of the output end of the power combiner are connected with the input end of a polarization control circuit through feeder lines. A plurality of channels of the second part of the output end of the power combiner are correspondingly connected with the input end of the polarization control circuit through last-stage amplification control circuit channels. The output end of the polarization control circuit is connected with a triad radio frequency artificial antenna array. The method that high-output-power antenna units and low-output-power antenna units are arranged alternately is adopted, and the aims that a simulation system can meet large-caliber antenna equipment with high radio frequency signal receiving capacity, and the experiment of small-caliber antenna equipment weak in radio frequency signal receiving capacity to radio frequency simulation can be considered are achieved, and the electronic countermeasures radio frequency artificial antenna array equipment and the feed control method have the advantages of being high in reliability and flexible in system work configuration and transformation. The structure is simple, and cost is low.

The invention discloses a radio frequency module electromagnetic compatibility design method comprising circuit board design, structural shielding design, power supply filtering and wiring design and radio frequency hybrid circuit design. The characteristics of various components are considered, and various components are arranged in a classified way so that common impedance coupling can be avoided; and the output signals of various lines are considered for reasonable wiring, and shielding is additionally arranged for the lines and the circuit modules having special requirements so that the mutual interference between the circuits can be reduced. The radio frequency module electromagnetic compatibility design method is applied to the field of the radar simulator, radio frequency semi-physical simulation and electronic countermeasure so that the weight and the size of electronic equipment can be reduced, the anti-interference capability of the electronic equipment can be enhanced and the product stability and the work efficiency can be enhanced.

The invention discloses an ultra-wideband filter which comprises a chamber and a cover plate arranged at the top end of the chamber, wherein the bottom of the interior of the chamber is provided with multiple comb teeth and ridge structures; the cover plate is provided with an input and output structure, and a tuning screw and a mounting screw are arranged on the cover plate. The ultra-wideband filter provided by the invention has the advantages of simpleness for processing, low processing cost, convenience for debugging, low insertion loss, good out-of-band restraint and high yield and the like. The ultra-wideband filter provided by the invention is expected to be widely used in an ultra-wideband wireless communication system, especially the military and civil fields including radar, missile guidance, electronic countermeasure, communication, etc.