46 results about "Airborne early warning" patented technology

The invention relates to a real-time tracking method of a nonspecific target based on partitioning, comprising three steps of classifier updating, target detection and weight updating. In the method, the target region is divided into multiple blocks; a classifier is used for maintaining each block, and updating is conducted frame by frame; the detection result of each classifier is comprehensively considered to determine the position of the target in the new video frame. In the method, an automatic weight updating mechanism is designed, so as to enable the blocks which are relatively stable to have greater decision-making power over the judgment of results, thus reducing the influence of various interferences; and the tracking performance is better than multiple international published algorithms recently. In the method, changes of appearances of objects caused by various interferences can be captured and accurate tracking can be conducted; the method has universality on target objects in various shapes and types; the calculation has low complexity and can be processed at real time. The invention has wide application prospect in various occasions needing tracking techniques, such as video monitoring, automatic driving, man-machine interaction, intelligent traffic, robot, airborne early warning and the like.

The invention discloses an intelligent skin antenna electric compensation method based on an embedded fiber bragg grating. The method is characterized by comprising the steps that the fiber bragg grating is firstly embedded into a skin antenna structure, then sensed strain is converted into deformation displacement through a strain-displacement transfer matrix, finally the excitation current of a skin antenna is modified through sensed deformation displacement, and therefore the aim of the influence of compensation structure deformation on electric performance is achieved. The method has the advantages that the mechanical property of the skin antenna structure can be monitored in real time, health monitoring on the structure is achieved, and the problem that the electric performance of the skin antenna is lowered due to structural vibration and deformation on active service can be solved through the method. A fiber bragg grating sensor is light in mass and can be embedded into the structure, the pneumatic and invisible performance of an aircraft is not influenced, the fiber bragg grating sensor can be applied to the fields of airborne early warning aircrafts, warcrafts, unmanned aerial vehicles, invisible warships and the like, and the key technology for guaranteeing the reliable service of the performance of the skin antenna is achieved.

The present invention discloses an access control method based on attribute authentication in a multi-UAV scene and mainly solves the problem that the unmanned aerial vehicle (UAV) communication system in a complicated environment cannot be controlled in the existing technology. The technical scheme of the present invention is as follows: firstly, a UAV communication network consisting of four parts: a satellite, an Airborne Early Warning Aircraft (AEW), a UAV and a ground station is initialized; secondly, when the UAV enters a certain aircraft group, the UAV sends registration information and attribute certificates to the AEW in the current aircraft group to complete the attribute authentication; and thirdly, the UAV sends a data access request to a satellite main body in the range of the current aircraft group to complete the authorized access to satellite data. The UAV of the present invention uses its own attributes as the basis for aircraft group join and data access so as to realize the flexible fine-grained access control. When the UAV accesses the satellite data, the UAV only needs to show attribute sets to realize the anonymous access to the satellite data and ensure the communication safety for the UAV system. The method provided by the invention can be used for authentication and access in the multi-UAV scene.

The invention belongs to the technical field of radar clutter inhibition and in particular relates to a target detection method by use of airborne early warning radar. The target detection method comprises the following specific steps: receiving space-time two-dimensional echo data by use of airborne early warning radar; determining normalized space-time two-dimensional frequency points corresponding to the positions of a clutter ridge curve related to the space-time two-dimensional echo data; constructing a clutter ridge steering vector basis matrix Psi according to the normalized space-time two-dimensional frequency points corresponding to the positions of the clutter ridge curve; constructing a matrix element error vector Es and a new clutter ridge steering vector basis matrix Psi', and performing iterative fitting on the data of the first unit to be tested in distance under the least square constraint by use of the new clutter ridge steering vector basis matrix Psi', thereby obtaining the fitted residual data of the first unit to be tested in distance; performing unit average constant false alarm rate detection on the fitted residual data of the first unit to be tested in distance, thereby obtaining a target detection result.

The invention relates to a special aircraft capable of lunching aluminum paper to replace a jamming bomb for teenager national defense scientific literacy education and training. The aircraft comprises an aircraft body, a left wing propeller, a right wing propeller, a left wing, a right wing, a nose main landing gear pulley, a rear landing gear left pulley, a rear landing gear right pulley, an empennage recoil jamming bomb launching cannon, an empennage rotary early warning radar, the aluminum paper, a control cockpit, an empennage, a cockpit door, an outer salute controller module remote control system and an outer aircraft remote controller. The special aircraft capable of lunching the aluminum paper to replace the jamming bomb for the teenager national defense scientific literacy education and training has the advantages and characteristics that the lower part of the back empennage of the aircraft is fixedly provided with the empennage recoil jamming bomb launching cannon which is used for remotely controlling to launch the aluminum paper to replace the jamming bomb, the remote controlling on the flight of an airborne early warning aircraft by the outer aircraft remote controller is vividly simulated, and the blank of the field in the foreign and domestic military model markets is filled.

The invention discloses an airborne early warning radar clutter suppression method based on auxiliary channels. The method includes: obtaining three-dimensional echo data received by an airborne early warning radar, obtaining a clutter ridge of the three-dimensional echo data, and thereby obtaining two-dimensional echo data; respectively obtaining num auxiliary channels and num search channels according to the clutter ridge of the three-dimensional echo data, obtaining spatial domain frequency vectors corresponding to the num auxiliary channels and time domain frequency vectors corresponding to the num auxiliary channels, obtaining a dimension-reduction matrix corresponding to the num auxiliary channels and a matrix corresponding to the num search channels in sequence, and thereby obtaining a dimension-reduction matrix for optimizing the auxiliary channels and a conversion matrix based on the auxiliary channels; respectively performing dimension-reduction processing of the two-dimensional echo data and the matrix corresponding to the num search channels, obtaining the echo data after dimension reduction and search channel guiding vectors after dimension reduction, obtaining filtering vectors after dimension reduction, performing clutter suppression processing of the matrix of the num search channels, and obtaining a distance Doppler graph.

The invention discloses a space-time adaptive processing method suitable for MIMO airborne-radar non-stationary clutter suppression. In the method, a MIMO system radar is combined to form a virtual array and an antenna pitching dimension freedom degree, and a non-stationary clutter can be effectively suppressed. An emission antenna and a receiving antenna are arranged vertically so as to form a virtual plane array possessing orientation and a pitching freedom degree, and STAP is used to carry out clutter suppression. The method is characterized in that one uniform linear array which is placed horizontally and one uniform linear array which is placed vertically are used for emitting and receiving signals; each array element of the emission antenna emits an orthogonal signal, each array element of the receiving antenna carries out matching filtering processing, and receiving data after filtering is equivalent to vertical plane array receiving data; a typical STAP method is used to complete clutter suppression; and finally, CFAR detection is performed on processed data. By using the method, advantages of anti-radiation countering, anti-interference and the like of a MIMO system airborne radar are possessed, and effective suppression to the strong short-range non-stationary clutter can be realized. The method can be widely applied to an airborne early warning radar adopting a MIMO system and other phased array airborne PD radars.

The invention provides a 3D virtual stereophonic airborne early warning system, and the system comprises a TCSA receiving and transmitting main unit, S-mode responders, an antenna, a control box, a display device, and a 3D virtual stereophonic synthesis system. The control box controls two S-mode responders located on an omnidirectional antenna at the top of an airplane, and the S-mode responders are connected with the TCSA receiving and transmitting main unit. The TCSA receiving and transmitting main unit is connected with the antenna located at the bottom of the airplane and the 3D virtual stereophonic synthesis system. The TCSA receiving and transmitting main unit judges the height, posture and heading of two airplanes through wireless electric discrimination, and then carries out the corresponding 3D voice warning, TA display and RA display. The system can achieve the warning for different azimuths in the space, and solves a problem of the positioning of a spatial sound source of an original warning system.

The invention discloses a track deception jamming system and a track deception jamming method for an airborne early-warning PD radar. The track deception jamming system comprises a receiving antenna,a transmitting antenna, an amplifier, a high-frequency shunt circuit, a radio frequency storage broadening module, a high-sensitivity receiving branch circuit, a pulse delay module, a low-sensitivityreceiving branch circuit, a square wave delay module, a square wave shaping module, a pulse gating module, a pulse modulation module, a microwave signal power amplification module and a power supply module. Through the design of two groups of track false targets related to radar signal repetition frequency, false tracks can be generated in front, back, left and right directions of a jammer and a shield target, and the purpose of supporting jamming is achieved.

The invention relates to a jet propulsion and power output integrated system, and belongs to the field of aero engines. The jet propulsion and power output integrated system comprises a jet driving generator, a power controller, a set of accumulators, more than one electric drive jet engine, and a plurality of other electric devices. The jet driving generator is used for generating electricity, the accumulators are used for storing electrical energy, the power controller is used for controlling and coordinating electric energy distribution, the electric drive jet engine is used for propelling an airplane to move forward, the electric energy generated by the jet driving generator is used for driving the electric drive jet engine and other electric devices after being controlled, coordinated and distributed by the power controller, and the power controller can better control and coordinate the electric energy distribution through charging and the discharging of the accumulators. The jet propulsion and power output integrated system has the advantages that the electric drive jet engine is driven by the electric power without a turbine, the difficulty of production and manufacture is reduced, weight is reduced significantly, efficiency is improved greatly by the adoption of the method that electric energy is output by the jet driving generator, and it is possible that airborne early warning aircrafts and laser weapon planes become bigger and stronger.

The invention provides an air maneuvering target detection method based on virtual time sampling and Wigner-Ville distribution (WVD) transformation. The detection method includes the following steps: (1) an S1 stage, wherein total echo data received by an airborne early warning radar is subjected to clutter rejection; (2) an S2 stage, wherein a target parameter two-dimensional searching range is ensured; (3) an S3 stage, wherein multi-array element data is utilized to finish the virtual time sampling; and (4) an S4 stage, wherein data after the virtual time sampling is subjected to the WVD transformation so as to form a cost function, thus a target parameter estimation result is obtained. According to the air maneuvering target detection method, the data after the multi-array element clutter rejection is subjected to the virtual time sampling, in other words, time sampling number of a single array unit is increased. Estimation accuracy of parameters is improved, and the data is subjected to the WVD transformation so as to construct the cost function. Obtained parameters corresponding to the maximum value of the cost function after searching is the estimation result of the target parameters. According to the air maneuvering target detection method, an accurate estimation result can be obtained on the condition of limited pulse points.

The invention discloses an airborne early warning radar low-loss stable-phase cable, which comprises a conductor, an insulating layer, an outer conductor, a shielding layer and a sheath, and the conductor is formed by twisting a plurality of silver-plated soft round copper wires, the outer surface of the conductor is coated with the insulating layer, the outer surface of the insulating layer is coated with the outer conductor, and the outer conductor is a silver-plated copper flat belt wrapping the insulating layer; and the lapping rate of the lapped silver-plated copper flat belt is more than40%, the outer surface of the outer conductor is coated with a shielding layer, the shielding layer is formed by weaving silver-plated soft round copper wires, and the outer surface of the shieldinglayer is coated with a sheath. The invention further discloses a preparation method of the airborne early warning radar low-loss stable-phase cable, the prepared cable has the advantages of light product weight, good bending performance and elastic deformation recovery capability, the mechanical performance is obviously higher than that of a semi-flexible cable, the shielding effect is close to that of a semi-hard cable, and the phase stability and the information transmission safety performance in the signal transmission process are ensured.

The invention discloses a modular radar wing. The modular radar wing is prepared from a win skeleton, a phased array radar module, a wing cover, a wing hinge and an electro-hydraulic-gas interface, wherein the phased array radar module is formed by a large amount of small-sized antenna elements. The whole modular radar wing forms a wing shape and is modularly designed, and replacement is convenient; the modular radar wing can be arranged on wings at two sides, so that radar research of a combat aircraft to the ground can be well realized; the modular radar wing can be arranged on a vertical tail wing, so that radar research of the combat aircraft to positions at two sides can be well realized; meanwhile, wing-shaped design is very beneficial for heat dissipation of the phased array radar module, and the problem of heat dissipation of radar is effectively solved; omni-directional dead zone-free research of an airborne early warning aircraft is realized, and inherent early warning disadvantages of the airborne early warning aircraft are improved.

The invention belongs to the technical field of antennas, and particularly relates to a design method for airborne early warning conformal array pitching detection beam forming, and the core of the design method is to introduce an amplitude control variable into a modified Bernstein polynomial. By means of the method, on one hand, optimization variables in the optimization process are reduced, theoptimization speed is increased, and on the other hand, the introduced amplitude control variables can enable the sidelobe level of the whole array to be reduced, which is very beneficial to airborneearly warning radar detection. And meanwhile, the optimized unit excitation change is gentle, so that the design of a feed network is facilitated, and the corresponding construction cost is greatly reduced. The method can be used for early warning radar pitching surface detection beam forming design, array sidelobe improvement and array feed network design simplification.

The invention provides an airborne early warning radar detection capability simulation method based on MATLAB, and the method comprises the steps: building a detection model of an airborne early warning radar according to the relative positions of the airborne early warning radar, a protection region and an enemy target; then, calculating the detection performance of the onboard early warning radar according to the motion parameters of the radar and the target and the radar system parameters; and finally, carrying out simulation and dynamic display on the detection performance of the airborne early warning radar by utilizing MATLAB software. The scheme of the invention is suitable for the detection capability simulation of the airborne early warning radar, can effectively simulate the detection performance of the airborne early warning radar, can effectively predict the Doppler velocity blind area and the near-field blind area, has a good man-machine interaction function, and can realize dynamic visualization.

The invention belongs to military high-tech electronics and discloses a novel electronic bomb. The operating principle of the novel electronic bomb includes: a coil 19, a coil 20, a resistor 21 and a resistor 22 form a positive half-cycle oscillation circuit, a coil 23, a coil 24, a resistor 25 and a resistor 26 form a negative half-cycle oscillation circuit, the two circuits operate by turns and both generate high voltage and ultrahigh frequency so as to enable positive and negative high-voltage direct currents charged to two ends of an electrolytic capacitor 30 and an electrolytic capacitor 31 to quickly turn over along with high-voltage and ultrahigh-frequency oscillation to generate high-power ultrahigh-frequency nonlinear frequency in tens of thousands of hertz and alternating voltage in thousands of kilovolt, and the high-power ultrahigh-frequency nonlinear frequency and the alternating voltage are regulated and modulated by frequency vibration emitter plates 27, 28 and 29 to radiate powerful 'shock waves' towards the sky and the ground. The novel electronic bomb is provided with special antennas for transmitting and receiving signals, so that signal contact of our armies is unaffected. When the novel electronic bomb is mounted on domestic military vehicles, warships and military planes, various radio station signals and satellite monitoring signals of enemies can be eliminated, the novel electronic bomb is hard to detect even by airborne early warning aircrafts and radars of the enemies, and signal contact of national defense optical cables of the enemies can be stopped.