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227 results about "Target indication" patented technology

Unmanned aerial vehicle tracking and intercepting system and method aiming at low and slow small targets

The invention relates to an unmanned aerial vehicle tracking and intercepting system and method aiming at low and slow small targets. The system comprises a ground detection tracking device, a ground control station, a differential GPS reference station and an unmanned aerial vehicle platform; the ground detection tracking device is used for searching and finding a low and slow small target in the air, accurately tracking the found and detected low and slow small target and giving target indication information in real time; the ground control station is used for receiving target indication information of the ground detection tracking device in real time; the differential GPS reference station adopts three-dimensional coordinates to perform error correction on the GPS positioning information of the unmanned aerial vehicle platform in real time, and then sends the correction amount to the unmanned aerial vehicle platform in real time; and the unmanned aerial vehicle platform is used for receiving target indication information of the ground control station and the corrected GPS positioning information to perform remote control autonomous flight, and simultaneously carries the task load module to execute tracking and intercepting tasks. The unmanned aerial vehicle tracking and intercepting system and method aiming at low and slow small targets achieves the accurate tracking and interception of the low-speed small target.
Owner:BEIJING MECHANICAL EQUIP INST

Multi-missile cooperation high-accuracy guidance control method based on beam riding guidance system

ActiveCN107179021AImprove typeSolve the problem of missing the target or even flying out of the guide beamDirection controllersGuidance systemGuidance control
The invention provides a multi-missile cooperation high-accuracy guidance control method based on a beam riding guidance system. The multi-missile cooperation high-accuracy guidance control method based on the beam riding guidance system has the beneficial effects that a multi-missile cooperation guidance manner is adopted for transmitting a following error formed in the process of using a follow-up launched missile to follow a guidance beam center line to a previous launched missile, and the previous launched missile takes the received following error as a ring-opening error compensation error and leads the ring-opening error compensation error into a control system, so that the type of the guidance control system can be substantially improved, and the problem that when the missile follows the guidance beam center line, the missile easily misses even flies out of a guidance beam to be out of control, is effectively solved; meanwhile, after the correction of the following error is completed, a target indication error formed in the process of using a guidance station to follow a target is calculated according to the target position obtained by the previous launched missile, and then is transmitted to the follow-up launched missile, so that the follow-up launched missile corrects the guidance beam center line followed by the follow-up launched missile according to the target indication error, thereby substantially eliminating the influence of the target indication error on the hitting precision of the missile.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Resource allocation method and resource using method, device and system

The embodiment of the invention discloses a resource allocation method, which comprises the following steps of: setting a corresponding relation between a predefined control channel format and a preset resource type; and when allocating the resource of the preset resource type to target user equipment (UE), transmitting resource allocation information according to a corresponding newly defined control channel format, and indicating the predefined control channel format to the target UE so that the target UE correctly acquires the resource allocation information and uses the resource designated by the resource allocation information according to a using method corresponding to the preset resource type. The embodiment of the invention also provides a resource using method and a device and a system for implementing the method. In the resource allocation method, the resource configuration information is flexibly set as required and the control channel format is indicated to the UE by establishing the corresponding relation between the control channel format and the resource type, thus semi-persistent resources can be allocated to the UE, the time of transmitting the resource allocation information is reduced, and the system overhead is saved.
Owner:DATANG MOBILE COMM EQUIP CO LTD

Target indication radar system capable of adaptively selecting waveform according to target distance

The invention discloses a target indication radar system capable of adaptively selecting the waveform according to a target distance, which comprises an antenna feedback subsystem, a receiver, a signal processing subsystem, a terminal subsystem, a monitoring subsystem, a time sequence controller and a transmitter, wherein the terminal subsystem sends a key target distance to the monitoring subsystem; the monitoring subsystem divides the target distance into three distance areas, adaptively judges which distance area the key target is located according to the important target distance, and acquires an optimal time sequence code; the time sequence controller generates transmitting signals x(t); the transmitter carries out amplification and filtering on the transmitting signals x(t) and generates transmitting radio frequency signals; the antenna feedback subsystem sends the transmitting radio frequency signals and receives echo radio frequency signals; and the receiver carries out frequency mixing processing on the echo radio frequency signals so as to acquire base band orthogonal two-way signals, the base band orthogonal two-way signals are sent to the signal processing subsystem for beam forming and pulse compression, and the distance, the height, the elevation and the azimuth deviation of the key target are sent to the terminal subsystem after the key target is recognized.
Owner:XIDIAN UNIV +1

Curve synthetic aperture radar (CSAR) ground moving target refocusing imaging method

ActiveCN109856635AImplement motion compensationRadio wave reradiation/reflectionCurve fittingAzimuth direction
The invention belongs to the field of synthetic aperture radar (SAR) ground moving target indication, and relates to a curve SAR (CSAR) ground moving target refocusing imaging method. The method comprises the following steps: S1, receiving a radar echo signal of a moving target, and preprocessing the radar echo signal; S2, dividing the radar echo signal into a plurality of sub-aperture echo signals along the azimuth direction; S3, transforming the sub-aperture echo signals into a distance frequency domain, and extracting phases of the signals along the azimuth direction one frequency point after another; S4, calculating a distance estimated value according to the extracted phases, and constructing a phase compensation factor by quadratic curve fitting; S5, performing motion compensation bythe phase compensation factor; S6, compensating for a phase estimation error by a map-drift (MD) self-focusing method; S7, performing Fourier transform along the azimuth direction and performing inverse Fourier transform along the distance direction respectively to obtain a moving target re-focusing result under a current sub-aperture; and S8, repeating the steps S3 to S7 to obtain a moving target re-focusing image sequence under a plurality of sub-apertures. Through adoption of the method, motion compensation is realized under the situation that target motion parameters are unknown.
Owner:NAT UNIV OF DEFENSE TECH

Autonomous control system for agile imaging satellite

The invention discloses an autonomous control system for an agile imaging satellite. The imaging satellite is provided with a satellite-borne replanning sub-system and a real-time task receiver; the real-time task receiver is used for carrying out real-time short message information interaction between the imaging satellite and users and between the imaging satellite and a ground supporting system; the replanning sub-system comprises a task preprocessing module, a test replanning module and a command generating module; the task preprocessing module is used for decomposing a target into a plurality of meta tasks and converting the target indication information of each meta task into target guide information; the task replanning module is used for receiving a preprocessing result and generating a new task planning scheme; and the command generating module is used for generating a satellite command from the generated task planning scheme and transmitting the satellite command to a satellite task sub-system for execution. According to the autonomous control system disclosed by the invention, the task planning scheme can be autonomously and partially adjusted according to the decided satellite task planning scheme and task requirements received in real time, so that in-time response to real-time tasks is realized, and the actual observation efficiency is improved.
Owner:NAT UNIV OF DEFENSE TECH

Angle-measuring and identifying method for target and bait interferences in main lobe of monopulse radar

The invention relates to the technical field of radar signal processing and discloses an angle-measuring and identifying method for target and bait interferences in a main lobe of monopulse radar. The method comprises the following steps: with an improved radar receiver, extracting an echo signal of an opposite angle difference channel and judging if bait interference exists; with single target angle measurement and single pulse angle measurement for target and bait, identifying true and false target angles; and controlling an angle tracking gate of the monopulse radar according to the angle measurement output of a true target. According to the angle-measuring and identifying method provided by the invention, the receiver is used for extracting a double-difference signal and processing the signal, so as to realize the angle position estimation for two undistinguishable targets, complete bait interference detection and true target identification, increase the interference detection and identification accuracy and calculation efficiency and enhance the instantaneity of interference detection. The angle-measuring and identifying method provided by the invention has important practical significance in increasing the angle distinguishing capability of monopulse radar and improving existing target indication radar and tracking guidance radar and terminal guidance radar.
Owner:UNIT 63892 OF PLA

Interference condition-based monopulse radar object and interference source angle measuring method

An interference condition-based monopulse radar object and interference source angle measuring method is disclosed and relates to the technical field of radar electronic countermeasures. A radar receiving antenna is transformed into a double polarization reception antenna, corresponding sum-difference networks and receiving channels are added, and a dual polarization monopulse radar device is formed; according to horizontal polarization sum, azimuth difference and pitching difference three channel output data of the radar device as well as vertical polarization sum, azimuth difference and pitching difference three channel output data, polarization characteristics of compound jamming can be estimated, polarization ratios of an object and interference can be substituted into a mathematical formula which then can be solved, errors of coupling between the interference signals and an object angle can be eliminated, and a real object angle can be estimated while a real angle of an interference source can be estimated; the invention provides a simple and effective main lobe compound jamming resisting method which is easy to implement in the engineering field; the method disclosed in the invention can be applied to conventional object indication radar devices, tracking and guiding radar devices, terminal guiding radar devices and fire control radar devices and is of great practical significance.
Owner:UNIT 63892 OF PLA

Two-dimensional electric scanning three-coordinate radar method based on inverted T-shaped linear array

ActiveCN109375174AImprove coherent accumulation timeImprove resolutionRadio wave reradiation/reflectionInverted tPhysics
The invention discloses a two-dimensional electric scanning three-coordinate radar method based on an inverted T-shaped linear array. The two-dimensional electric scanning three-coordinate radar method comprises the steps of: S1, designing a linear array sub-antenna; S2, designing an inverted T-shaped structure configuration; S3, designing and measuring an azimuth multi-beam angle; S4, and designing related azimuth and pitch frame scanning. The two-dimensional electric scanning three-coordinate radar method realizes the two-dimensional electric scanning three-coordinate function, prolongs theFFT phase coherent accumulation time by means of pulse pressure and FFT time-frequency composite processing and a large space solid angle, further improves the Doppler resolution capability and the ground clutter suppression capability, comprehensively realizes simultaneous monitoring of a space target and a ground target, thus enables a radar to integrate multiple functions of a search warning radar, a target indication radar, a tracking radar, a space monitoring radar and a ground and sea surface monitoring radar, and has the advantages of simple implementation, low purchase cost and operation cost, high measuring precision of azimuth angle, pitch angle, distance and speed, short frame scanning period, high data rate and good track quality.
Owner:西安八阵图电子科技有限公司
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