14 results about "Monopulse radar" patented technology

The invention discloses an array and difference beam co-excitation optimization method and system based on unit dynamic range ratio constraint and a storage medium, and mainly solves the problem that an array and difference beam directional diagram cannot be optimized in a complex application scene and the dynamic range ratio cannot be reduced at the same time in the prior art. The implementation scheme comprises the following steps: determining an antenna optimization index; optimizing the planar array antenna and the difference beam directional diagram by adopting a convex optimization algorithm, and solving the planar array antenna and the difference beam directional diagram to obtain an initial sum beam complex excitation coefficient meeting a constraint condition; adding a unit dynamic range ratio constraint in a planar array antenna and difference beam directional diagram optimization problem, and converting the directional diagram optimization problem after adding the unit dynamic range ratio constraint into a series of convex optimization sub-problems; iteratively solving the convex optimization sub-problem by using a solver to obtain an optimal sum beam excitation coefficient; and synthesizing a sum and difference beam directional diagram of the array according to the optimal sum beam excitation coefficient. According to the invention, the sum-difference beam synthesis with a small dynamic range ratio can be effectively realized while the radiation performance constraint is satisfied, and the method can be used for a monopulse radar system with a cover.

The invention provides a medium-high repetition frequency velocity measurement method and system based on a height-finding radar, and relates to the technical field of data processing and signal processing. According to the method, the target point track distance obtained through data processing is used as prior information, the number of target distance folding times is calculated, and the problem of range finding ambiguity caused by medium-high repetition frequency is solved; a medium-high repetition frequency mode is adopted for tracking speed measurement, and the problem that the low repetition frequency speed measurement range is small is solved; a multi-frequency mode is adopted, the prior information of the track speed of a target point is utilized, and corresponding pulse repetition frequency and emission frequency are calculated and selected, so that the blind speed problem is solved; the interference problem of ground clutter and meteorological clutter is solved by adopting multi-dimensional CFAR (Constant False Alarm Rate) processing and a method of narrowing a target search range through acquired priori information such as target point track distance and point track speed; a point track velocity measurement and Doppler velocity measurement combined processing method is adopted to solve the problem of velocity measurement resolution of monopulse radar.

This invention discloses a practical single-pulse radar training simulator architecture, employing a three-layer structure design consisting of a user layer, a middleware layer, and an execution layer. The user layer, based on a B / S architecture, handles human-computer interaction, training processes, and scenario configuration. It pre-generates and distributes target trajectory-related simulation parameters and pre-set information for abnormal events, while simultaneously collecting operational information and device status and conducting training evaluation. The middleware layer is an embedded control platform used to acquire servo differential angle information in real time, calculate angular error, attenuation, phase, and Doppler echo control parameters, as well as abnormal control quantities, according to the PRF beat. The execution layer is a DRFM simulation sub-unit that receives radar transmitted pulses and applies time delay, Doppler, and amplitude-phase modulation based on control parameters, generating the main target, debris, co-frequency station, and noise echoes for output to the trained radar. This invention achieves a balance between complexity and real-time performance through functional decoupling and separation of responsibilities, supporting high-fidelity training under multiple targets and multiple abnormal conditions.

The application discloses a compact full-metal multi-beam single-pulse antenna, and belongs to the technical field of antennas.The application solves the problems of narrow bandwidth, low feed efficiency and small mechanical strength of a one-dimensional multi-beam single-pulse antenna.The technical points of the application are as follows: the compact full-metal multi-beam single-pulse antenna is composed of a sum-difference comparator based on a half-height slot gap waveguide and a planar dragon's breath lens composed of sliding symmetrical pins.The sum-difference comparator comprises two feed ports, two sections of slot gap waveguides with different widths and a matching pin.The application is suitable for a large-view-field multi-beam single-pulse radar system.

The present application belongs to the technical field of phased array radar monopulse and difference angle measurement, and particularly relates to a method for quickly generating angle discrimination curves of a monopulse radar at multiple pointing angles, which comprises the following steps: measuring the azimuth and elevation angle discrimination curves of the normal wave position of a phased array of a monopulse radar in a darkroom environment; scanning the beam pointing according to a designed trajectory, and synchronously rotating the turntable according to a corresponding designed trajectory to measure the difference and ratio data at the designed wave position; characterizing the deformation of the angle discrimination curves caused by the non-ideal factors of the phased array as translation and rotation, and calculating the translation coefficient C and the rotation factor K of the angle discrimination curves at different wave positions compared with the angle discrimination curves at the normal wave position based on the measured difference and ratio data; based on the obtained translation coefficient C and rotation factor K of the wave position, interpolating and predicting the C and K of all wave positions within the required wave position range; and based on the C and K of all wave positions, constructing a lookup table and writing it into the phased array radar to complete the quick generation of the angle discrimination curves of the monopulse radar at multiple pointing angles.

This invention discloses a hardware-in-the-loop simulation system for airborne monopulse radar, primarily addressing the problem that existing technologies cannot simulate the entire process of airborne monopulse radar signal processing from the antenna front-end to the back-end. It includes an echo simulation module, a receiving module, and a signal processing module. The echo simulation module simulates and generates radio frequency (RF) echo signals from the sum, pitch difference, and azimuth difference channels of the monopulse radar during aircraft flight. The receiving module down-converts these three RF echo signals to obtain three intermediate frequency (IF) signals. The signal processing module samples and processes these three IF signals, outputting the target detection range, velocity, pitch angle, and azimuth angle of the aircraft. This invention uses a combination of hardware and software to design an airborne monopulse radar simulation system, resulting in a short development cycle, low cost, high reusability, and the ability to simulate the entire process of airborne monopulse radar signal processing from the antenna front-end to the back-end. It can be used for the design and functional verification of airborne monopulse radar.

The application provides a small single-pulse radar signal processing system based on a single-chip platform, which is integrated on a single chip, adopts an integrated scheme of waveform generation+antenna control+signal collection+signal processing, and concentrates small phased array antenna signal generation and the like into completion in the single chip, completes single-pulse radar signal fixed-point and floating-point operation based on a ZYNQ-7000 series chip, completes signal collection and fixed-point operation tasks by an FPGA in the chip, and an ARM core completes system control and floating-point data processing tasks, so that the real-time requirement and the processing precision requirement of signal processing can be met at the same time, and the problems of complex structure, high power consumption, high cost, difficulty in miniaturization and integration and the like of existing single-pulse radar signal processing and control components are effectively solved.

A single pulse radar simulation target method and device based on reinforcement learning, the method calls a detection module to obtain spatial position data of a single pulse radar in real time through a detection radar; a control strategy generation module generates a multi-point source signal control strategy according to real-time spatial position data provided by the detection module and in combination with a reinforcement learning algorithm; a multi-point source signal generation module outputs a multi-point source signal according to the multi-point source signal control strategy generated by the control strategy generation module, and uses the output multi-point source signal to make the single pulse radar receive a simulation target signal. The application can flexibly adjust parameters of the multi-point source signal by analyzing and processing single pulse radar position data provided by the detection radar in real time, so that the single pulse radar continuously receives a model target signal until the single pulse radar can land in a target area set in advance.

The invention discloses a multi-point source target simulation method and device based on a whale optimization algorithm in the technical field of radar navigation and intelligent optimization algorithms. The method and device are used for solving the problem of safe landing of monopulse radar under the influence of phase errors. The multi-point source target simulation method comprises the following steps: constructing a multi-point source target simulation device based on a golden whale algorithm; adopting Logistic chaotic mapping to generate an initial amplitude-phase parameter population; evaluating the parameter combination performance through the objective function; dynamically adjusting a convergence factor and a search step size; carrying out neighborhood spiral search in the optimal solution; guiding the population to gather towards an optimal solution; performing random exploration by adopting a golden sine strategy; and outputting the optimal amplitude-phase parameter. The device correspondingly realizes the modules. According to the multi-point source target simulation method and device, through a three-stage optimization strategy, a landing position is ensured to be in a safe range under a phase error, and the landing reliability in a complex environment is remarkably improved.

The invention discloses a monopulse simulation method under the condition of local damage of a darkroom array, and the method comprises the steps: determining an array region which needs to be used on a spherical array when an aircraft carries out the semi-physical simulation in a radar darkroom, and a damaged array region on the spherical array, and selecting a new array region; a rotary table for fixing an aircraft is controlled to rotate according to a preset angle, so that the midpoint of the area corresponds to the zero position of the rotary table at the center of a radar darkroom, and the orientation of a monopulse radar guide device carried on the aircraft is kept away from a damaged array area; according to the determined preset angle and a rotation angle instruction of executing the first rotation sequence by the aircraft on the turntable, calculating a rotation angle instruction of executing a second rotation sequence by the turntable; according to the preset angle and a sight angle needing to be simulated during simulation of the aircraft, a rotation angle instruction of executing a second rotation sequence by the spherical array is calculated; and the rotary table and the spherical array are executed according to the corresponding rotation angle instructions, so that a monopulse simulation process is performed.

The application relates to an improved forward-looking imaging method of a single-pulse radar, and discloses an improved forward-looking imaging method of a single-pulse radar. The application aims to solve the problems of low azimuth resolution, large angle measurement error and blurred imaging of actual measured scene data in the prior art of forward-looking imaging based on a single-pulse amplitude comparison method. The process comprises the following steps: 1, continuously obtaining echo signals of target scattering points by a receiving antenna in scanning to establish sum signals and difference signals; 2, obtaining a new two-dimensional matrix; 3, obtaining pulse compression echo results of the sum channel and the difference channel; 4, constructing a sum-difference ratio of the three processed signals, then performing angle measurement by a phase comparison method to obtain deflection angles of the target scattering points, and obtaining gray values of target distance-pulse domains based on the deflection angles and distances between the target scattering points and the center of the antenna; transforming the distance-pulse domains into distance-azimuth domains; and 5, performing pulse-by-pulse non-coherent accumulation on the converted distance-azimuth domains to redraw a forward-looking image. The application is used in the field of radar imaging.

The present invention proposes a subarray division method for sum and difference beamforming of a monopulse radar antenna. The method comprises: dividing a given 2N-element symmetrical linear array of the monopulse radar antenna into 2M symmetrical subarrays, exciting the array elements in each subarray with equal amplitude and phase, and weighting #imgabs0# and #imgabs1# only at the subarray level to form desired sum and difference beams; deriving an array element excitation vector #imgabs4# corresponding to the sum beam and an array element excitation vector #imgabs5# corresponding to the difference beam from the subarray-level sum and difference beam weighted excitation vectors #imgabs2# and #imgabs3#, and forming a matrix W from these two sets of vectors. ele , according to W ele The compressible characteristics of each column vector construct a sparse matrix S' ele , and perform sparse representation on it; according to the radiation requirements of the sum beam and difference beam, based on the joint sparse recovery theory, a convex optimization model of sum and difference beamforming that minimizes the number of sub-arrays is established; solve the convex optimization model and calculate the sparse matrix S' ele , from which we extract the number of subarrays M, the subarray-level weighted excitations corresponding to the sum beam #imgabs6#, and the subarray-level weighted excitations corresponding to the difference beam #imgabs7#

The invention belongs to the field of radar interference suppression, and particularly discloses an interference cancellation method and device applied to a monopulse radar, and the method comprises the steps: dividing a subarray-level planar array into four quadrants according to the structural characteristics of the monopulse radar, and generating a multi-channel radio frequency signal; the power range of the multi-channel radio frequency signal is adjusted through the adjustable attenuator module, and the multi-channel radio frequency signal data is converted into multi-channel baseband signal data; a multi-channel digital baseband signal is generated through a down-conversion module and an ADC (Analog to Digital Converter) module; the multi-channel digital baseband signal is sent to an FPGA signal processing module for interference cancellation processing, and a digital baseband signal after interference cancellation is generated; and converting the digital baseband signal after interference cancellation into a multi-channel analog signal, and carrying out up-conversion on the multi-channel analog signal to obtain a radar intermediate frequency signal. According to the application, the monopulse radar receiving signal-to-noise ratio under strong interference can be effectively improved.

The present application relates to a cross-eye jamming method, equipment, device, and medium based on a digitally coded metasurface. Two digitally coded surfaces are used as antenna structures in the cross-eye jamming equipment and are symmetrically arranged on both sides of the protected target in the direction of the line of sight of a single-pulse radar. Any one of the digitally coded metasurfaces is selected, and the compensation phase of each unit is calculated and encoded based on the beam information of the interference wave signal to be modulated, the feed horn, and the coordinates of each unit on the digitally coded metasurface. The coding on the other metasurface is determined based on the coding on the metasurface. The amplitude ratio of the signals transmitted by the two feed horns is determined based on the angle between the digitally coded metasurface and the line of sight of the interfered radar. A modulated interference signal is generated based on the signal amplitude, the amplitude ratio, and the encoded two digitally coded metasurfaces. This method can effectively reduce costs and flexibly control the direction of the modulated signal beam.