97 results about "Digital array" patented technology

The invention discloses a dynamic unmanned aerial vehicle cluster electromagnetic characteristic modeling method and system based on a digital array radar, and the method specifically comprises the steps: setting radar system parameters, building a time-varying motion model of an unmanned aerial vehicle cluster, and obtaining the formation pose distribution of the unmanned aerial vehicle cluster under a global coordinate system; component decomposition is carried out on an unmanned aerial vehicle CAD model, shielding analysis is carried out under the radar sight line constraint condition, time-varying scattering center parameter extraction is carried out according to the dynamic electromagnetic effect between targets, scattering center space distribution of an unmanned aerial vehicle cluster is updated in a time sequence recursion mode, and construction of a time-varying scattering center model is completed; a radar system signal model is constructed according to digital array radar DAR parameters, multi-dimensional dynamic feature extraction and parameter mapping are carried out, digital array radar multichannel signal modulation and unmanned aerial vehicle cluster target radar echo construction are completed, and radar scattering electromagnetic characteristic modeling of a dynamic unmanned aerial vehicle cluster is realized. According to the method, the model description accuracy is improved, and the calculation process is more efficient.

The invention relates to the technical field of qec correction of digital arrays, in particular to a feedback-based digital qec correction method for a digital array, and the method comprises the following steps: S1, constructing a transceiving channel distortion model, and calculating distortion model parameters; s2, constructing a transmitting terminal pre-distortion model according to the distortion model parameters, and performing transmitting terminal qec correction; and S3, constructing a post-distortion model of the receiving end according to the distortion model parameters, and performing qec correction of the receiving end. According to the scheme, the problem of mirror image and direct current correction of the receiving and transmitting end of the digital array antenna is solved digitally, the method does not depend on hardware design and does not need support of an external reference source, mirror image qec correction is carried out by using a digital method based on feedback, error correction of the mirror image and the local oscillator is also realized by the method, and the method is high in precision and good in portability.

The invention discloses a broadband digital array interference system emission correction method and device, and the method comprises a time delay correction process, and the time delay correction process comprises the steps: a correction source generates N paths of correction dot frequency signals with completely consistent time delay and initial phases at the same time, and the frequency change of each path of correction dot frequency signal is f1-f3 in sequence; each path of correction dot frequency signal is amplified by a transmitting channel and coupled by a coupler and then is sent to a correction selection switch; the correction selection switch gates the N paths of coupling signals one by one and sends the signals to the correction receiver; the correction receiver outputs correction sample signals of N transmitting channels; the signal processing module is used for processing N paths of 3N correction sample signals by adopting a three-frequency-point correction method to obtain a time delay compensation table of all transmitting channels; the method has the advantages of simple correction process and low time cost.

The invention discloses a multi-target tracking and multi-constraint resource allocation method in an all-digital array radar system. The method comprises the following steps: constructing a radar multi-target tracking and multi-constraint resource allocation optimization model; at the current tracking moment, predicting the state of each to-be-tracked target, calculating the expected detection probability of each to-be-tracked target and forming a set; judging whether the set meets a constraint condition in the optimization model or not, and if not, increasing the stop time and updating the set until the set meets the constraint condition; selecting beam data of two targets with the lowest detection probability and the second lowest detection probability in the set, and performing filtering and prediction; and repeating the steps until the current moment reaches the radar tracking set time, and outputting the prediction states of all tracked targets at each tracking moment. According to the invention, the all-digital array radar system can consume minimum radar resources while ensuring the target tracking precision.

The invention discloses a main lobe gain maximization method for an analog-digital hybrid array of a radar communication system. According to the method, the ratio of the maximum minimum main lobe level to the peak side lobe level is used as a target function, and under the main lobe ripple constraint, the simulation weight constant modulus constraint and the digital weight power constraint, the ADMM (Alternating Direction of Multiplexing) is used for carrying out joint design on the simulation weight and the digital weight. In the ADMM framework, a Riemann conjugate gradient method is adopted to solve a simulation weight subproblem with constant modulus constraint; and solving a digital weight by adopting a Lagrange multiplier method. A numerical result shows that the method can generate better main lobe ripples and lower peak side lobe level, and has good beam directional diagram accurate control performance.

The invention provides an extensible distributed simultaneous receiving digital multi-beam forming closed-loop series processing architecture and method, which are used for realizing distributed digital multi-beam forming of large-scale array low data interaction. The architecture comprises M identical processing sub-modules, and each processing sub-module outputs L beams to form LM simultaneous multi-beams. And each processing sub-module is serially connected with two adjacent processing sub-modules to form a series closed loop structure. And each processing sub-module performs sub-array beam forming of LM beams of local P unit antennas, timestamps data after beam forming, and performs caching processing and beam forming according to design requirements. The beam former adopts a closed-loop series architecture, and the interaction data rate between processing submodules is only related to the sampling data rate S and the number of digital beams formed at the same time. The method is suitable for low-cost and rapid scale expansion of medium and large scale digital array multi-beam antennas.

The invention belongs to the technical field of digital array processing, and discloses a broadband digital array adaptive equalization method. The calibration component is responsible for generating and transmitting a standard linear frequency modulation signal under the control of an instruction and timing, and transmitting the standard linear frequency modulation signal to each digital component in the array after the standard linear frequency modulation signal is radiated by an internal monitoring network or an external monitoring horn; the digital component is responsible for receiving the radio frequency signal sent by the calibration component, completing signal amplification, frequency mixing, filtering, AD sampling, DDC and other processing under the control of an instruction and timing to obtain baseband IQ data, and then completing automatic calculation and programming of an equalization coefficient based on an adaptive equalization algorithm; the radar control is responsible for sending a control instruction and timing to the digital assembly and the calibration assembly through an optical fiber transmission network, and automatically completing traversal of all digital channels. According to the invention, the digital array has adaptive broadband equalization capability, so that the problem that the broadband performance is reduced due to factors such as temperature drift and device aging in a long-term working process is solved.

The invention discloses a graph database decimal index coding and decoding method based on key value storage, and belongs to the technical field of graph database management. The coding method comprises the following steps: receiving numerical values to be coded and sorting direction parameters thereof; normalizing the to-be-coded numerical value, and extracting a symbol, a weight and a digital array of the normalized to-be-coded numerical value; dynamically generating a coding auxiliary parameter set based on the sorting direction parameters and the symbols, the coding auxiliary parameter set comprising sorting masks, escape characters and filling characters; converting the symbol, the weight and the digital array into a binary coded stream according to the coding auxiliary parameter set; adding a data termination mark consisting of escape characters at the tail of the binary coded stream; and outputting the binary coded stream for orderly storage and retrieval of the data. According to the method, the decimal value is decomposed into the symbol, the weight and the digital array, and then the compact binary coding mode is adopted for coding, so that efficient storage and query of the graph database index are realized.

The present invention discloses a zero-IF receiving array IQ imbalance beam-level compensation method, comprising: obtaining a radio frequency signal received by each array element; obtaining M intermediate frequency analog signals; obtaining M baseband analog in-phase signals and M baseband analog quadrature signals; performing A / D sampling on the M baseband analog in-phase signals and the M baseband analog quadrature signals respectively to obtain M baseband digital complex signals; obtaining M receiving channel amplitude and phase error compensation values; performing channel amplitude and phase error compensation and beam weighting compensation on the M baseband digital complex signals of the digital array, and summing the values to obtain a beamformed output complex signal; and utilizing the circular characteristics of the received baseband digital complex signals to estimate and compensate for the IQ imbalance error after beamforming to obtain a final baseband digital complex signal of the digital array. The present invention has the advantages of providing a multi-channel IQ imbalance compensation method that does not require channel-by-channel estimation and compensation for IQ imbalance errors and protects the circular characteristics of communication signals from being destroyed.

The invention relates to the technical field of digital signal processing, in particular to an implementation method of a sidelobe cancellation algorithm based on an FPGA and an HLS. Complex operations such as matrix inversion in the sidelobe cancellation algorithm are realized through the HLS, and the HLS adopts a C / C + + programming mode, so that the development efficiency is high, and iteration and upgrading of IP configuration can be quickly realized. Other operations in the sidelobe cancellation algorithm are realized through the FPGA, so that the relationship between resources consumed by large data volume processing and processing delay is balanced. Through cooperative work of the FPGA and the HLS, the development efficiency can be improved while the requirements for high processing performance and high real-time performance are met, parameters such as the number of channels, the number of sampling points and the matrix inversion dimension can be controlled through parameter configuration in the implementation process of the sidelobe cancellation algorithm, and the method has the advantages of being high in real-time performance, high in universality and high in development efficiency and has wide application prospects. The digital array signal processor can be widely applied to radar digital array signal processor products.

The embodiment of the invention provides an antenna array surface control method, an antenna array surface control device and an antenna array surface control system for a digital array radar, electronic equipment, a computer readable storage medium and a computer program product. The antenna array plane control method for the digital array radar comprises the following steps: updating a library file based on a user terminal; wherein the library file is a parameter file which is predefined by a user and is related to antenna array plane control; in response to the received task information sent by the user terminal, determining array surface control information based on the task information; based on the array surface control information and a library file associated with the array surface control information, determining an array surface control instruction; and issuing the array plane control instruction to a digital array unit of the digital array radar. By utilizing the method disclosed by the invention, different tasks can be matched to realize the expansion and multiplexing of the digital array module (DAM), the flexible switching of the working modes of the antenna array surface and the shortening of the development time of a control program.

The invention relates to the field of active phased arrays, and provides a digital array ground installation pattern test method and system, and the method comprises the steps: achieving the time synchronization of a digital array and a test control system through a synchronization pulse; under time synchronization, a radio frequency digital chip in the digital array completes test data acquisition and storage according to a control instruction; and reading the stored test data, and obtaining a digital array installation directional diagram in each working mode through offline calculation in data processing software. The invention provides an effective solution for radio frequency digital integrated multifunctional digital array directional diagram test, and can be expanded to be used for digital array G / T value test.

The invention provides an embedded digital-analog hybrid array system and method based on modular mosaic units. The method comprises the steps that a tested radar transmits a radar signal in a real-time coupling mode; the cluster scene mapping unit resolves cluster scene time-space-spectrum-energy information under the unified coordinate system in real time and generates corresponding control parameters; the digital-analog hybrid system control unit calculates array control parameters of the analog array and the digital array according to the control parameters; the digital-analog mixing unit completes cluster scene simulation according to the array control parameters and completes cluster target characteristic dynamic simulation; and the computer real-time control unit controls the working time sequence and information interaction of other modules in real time according to the input signal, solves a three-axis control instruction of the flight turntable in real time, and sends the instruction to the cluster scene mapping unit and the flight turntable. According to the invention, cluster target simulation is completed through an embedded digital array, and dynamic simulation of electromagnetic characteristics of a cluster complex scene is rapidly realized.

The present invention discloses a phase modulation dynamic truncation device, belonging to the fields of communications, radar, electronic countermeasures, and integrated radio frequency technology. The device comprises N-channel phase modulation sampling modules, one-channel energy sensing module, N-channel dynamic truncation modules, N-channel phase demodulation modules, and one-channel beamforming module. By estimating the signal energy within the instantaneous bandwidth, the device adaptively selects an appropriate bit width at the unit level for dynamic truncation. Phase modulation and demodulation are simultaneously introduced to reduce truncation spurious noise. This device optimizes distributed digital array edge acquisition, computing, processing, and other resources and throughput efficiency, while ensuring that the overall array synthesis meets signal-to-noise ratio and dynamic range requirements. This significantly reduces implementation complexity, power consumption, and cost.

The application discloses an unmanned radar detection and array monitoring integrated method, which comprises the following steps: 10) establishing a digital array monitoring system; 20) designing a radar detection and array monitoring integrated working mode; and 30) designing a radar detection and array monitoring integrated scheduling. In the working mode, the target detection mode and the array monitoring mode are considered and designed compatibly, the target detection performance is maintained, the array channel monitoring can be performed in real time on line, and the antenna array health state can be mastered in real time. The application provides an implementation approach for real-time on-line automatic array channel monitoring.

The invention discloses a digital array reconnaissance system signal search scheduling method, system and device and a medium, and relates to the technical field of digital array reconnaissance system signal search scheduling, and the method comprises the steps: introducing a virtual and real node mode, configuring a wave position arrangement model of each working frequency band for any to-be-processed digital array reconnaissance system, acquiring configuration parameters input by a user, setting the wave position arrangement model according to the configuration parameters, and generating a signal search wave position arrangement model of each working frequency band; and acquiring a search space-frequency domain setting instruction given by a user, and performing signal search based on the search space-frequency domain setting instruction in combination with the signal search wave position arrangement model. Through introduction of virtual and real nodes and flexible configuration based on user input, the flexibility and adaptability of wave position arrangement are remarkably improved, the requirement for the memory capacity of a computer is lowered, diversified task requirements can be met, and dynamic adjustment can be conducted according to different environments and target characteristics.

This disclosure proposes a calibration method, apparatus, electronic device, and storage medium for a digital array antenna. The method includes: determining the number of channels to be calibrated in the digital array antenna, wherein the channels to be calibrated are either transmit channels or receive channels; generating a calibration signal corresponding to the channels to be calibrated based on the number of channels, wherein the signal length of the calibration signal is greater than a first threshold, and the autocorrelation descriptor value of the calibration signal is greater than a second threshold; acquiring the coupled signal received after the calibration signal is transmitted through the channels to be calibrated and a coupling network; performing correlation detection on the calibration signal and the coupled signal to obtain channel characteristics, wherein the channel characteristics include the amplitude, phase, and delay of the channels to be calibrated; and compensating the channels to be calibrated based on the channel characteristics. Therefore, on-orbit non-linking calibration of the digital array antenna can be achieved based on a calibration signal with a long time domain length and good autocorrelation, thereby improving the overall calibration and operating efficiency of the array.

The invention discloses a time-frequency synchronization and data distribution system based on a passive optical network, and belongs to the technical field of time-frequency testing. Time frequency and data integrated distribution is realized by using the passive optical network, the wiring difficulty of the array antenna can be effectively simplified, and the size of the array antenna is reduced. The complexity of a time-frequency synchronization and data transmission system of the digital array antenna is simplified, the time delay self-calibration of the transmitting component is realized, and the stability of the system is improved. Comprising a master device, an optical splitter and a slave device, wherein the master device is connected with a time-frequency reference signal, generates an optical signal and transmits the optical signal to the slave device through the optical splitter; the optical splitter carries out power division on a main end downlink optical signal to the slave end device, and transmits an uplink signal of the slave end device to the main end device after converging the uplink signal; and the slave end device receives the optical signal transmitted by the master end device, recovers the tail end frequency signal, completes master-slave transmission time delay calibration and time synchronization, and demodulates the digital signal.

The invention discloses an array surface component monitoring and maintenance method, system, equipment and medium, and relates to the technical field of digital array surface monitoring, and the method comprises the following steps: dividing a digital array surface into a first plane grid region and a second plane grid region by taking half of the physical size of a component and a channel as step length; and forming an array plane layout description file for describing component and channel layout on the basis, parametrically configuring to-be-monitored component information, and monitoring the display layout of an interface. And performing polling monitoring on the component based on the description file, and displaying monitoring information on a monitoring interface. When a fault occurs, a fault component or channel can be shielded, and component information is updated after the component is replaced. According to the method, efficient management and precise maintenance of the digital array plane are realized, the component state can be monitored in real time, the fault component can be accurately positioned, the component information can be quickly updated, the reliability and maintenance efficiency of the system are improved, and the method has remarkable practicability and application value.

1. The name of the design product: portable calibration frame (THDS equipment). 2. The use of the design product: used for the light path calibration of railway infrared axle temperature detection system (THDS equipment); the portable calibration frame is fixed on a specific position of the steel rail, and the light path of the digital array probe is corrected to the center point of the target of the portable calibration frame (THDS equipment) by using a laser sight, so as to ensure the azimuth angle accuracy of the railway infrared axle temperature detection system (THDS equipment). 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The invention discloses a stratospheric airship-borne radar large-scale digital array antenna design method and device, and belongs to the technical field of radar antennas. According to stratospheric airship platform parameters and radar detection requirements, the technical requirements of the array antenna are calculated; according to the technical requirements, designing an azimuth all-digital and pitching beamforming digital array antenna, and optimizing the unit amplitude and phase of the digital array antenna by adopting a genetic algorithm; the digital array antenna comprises an azimuth 96-unit full-digital architecture and a pitching 10-unit series feed forming array. According to the invention, the contradiction between the large-scale and wide-angle scanning design of the array antenna and the light weight and low power consumption requirements of the stratospheric airship is overcome, and a solid technical basis is provided for the application of the stratospheric airship-borne radar.

The embodiment of the invention provides a method and a system for rapidly testing the sampling synchronism of a large-scale digital array system, which can solve the technical problem that a tested system with a large-channel-number characteristic cannot be judged in related technologies. The method comprises the steps of obtaining a judgment threshold based on a test signal bandwidth and a sampling rate; under the condition of receiving a broadband test signal, completing sampling of each channel and recording data to obtain a collection data set of each channel; confirming the lowest frequency and the highest frequency in the collected data set of each channel; obtaining the lowest frequency point phase and the highest frequency point phase of each channel; determining the lowest phase difference and the highest phase difference between other channels except the reference channel and the reference channel; further obtaining a channel frequency phase difference of each channel; and obtaining a synchronous detection result through a preset condition according to the channel frequency phase difference and the judgment threshold. The method is extremely high in testing efficiency for a large digital array system with thousands of sampling channels or even tens of thousands of sampling channels.

The invention provides a radar echo real-time simulation method based on an FPGA and a digital array, and relates to the technical field of radar system simulation and testing, and the method comprises the following steps: receiving a radar transmission signal, and carrying out the digitalization and down-conversion processing, and obtaining a baseband I / Q signal; in the FPGA, performing multi-scattering-point range profile generation processing on the baseband I / Q signal to form a plurality of echo components corresponding to different scattering points of a target; performing micro-motion characteristic modulation processing on the plurality of echo components: sequentially performing main body Doppler modulation and micro-Doppler modulation on each echo component through a multi-stage phase modulation unit so as to generate an echo signal with main body motion and micro-motion characteristics; carrying out superposition synthesis on the echo signal subjected to micro-motion characteristic modulation and a simulated environmental effect signal to obtain a synthesized signal; and performing up-conversion and digital-to-analog conversion on the synthesized signal, and outputting the signal to a tested radar through a digital array feed system.

The invention relates to an optimization design method and system for a digital structure of an automobile door outer plate, belongs to the technical field of automobile door systems, and solves the problem that all performances of the automobile door outer plate cannot be considered and planned as a whole during design in the prior art. Comprising the following steps: constructing four groups of car door outer plate thickness-performance index digital arrays within a preset car door plate thickness range; comprising a thickness-rigidity digital array, a thickness-crashworthiness digital array, a thickness-manufacturing process digital array and a thickness-lightweight digital array; respectively carrying out data fitting on the four groups of car door outer plate thickness-performance index digital arrays to obtain four car door outer plate performance index functions; and taking the thickness of the vehicle door outer panel as a variable, constructing a vehicle door outer panel multi-objective optimization model based on the four vehicle door outer panel performance index functions, and solving to obtain the optimal thickness of the vehicle door outer panel. The research and development period of interactive discussion among design, performance and technology in the research and development process is shortened.

The invention discloses an unattended radar detection and array plane monitoring integrated method. The method comprises the following steps: 10) establishing a digital array plane monitoring system; 20) designing a radar detection and array plane monitoring integrated working mode; according to the method, a target detection mode and an array plane monitoring mode are considered as a whole in a working mode and are designed in a compatible mode, the target detection performance is kept, meanwhile, array plane channel monitoring can be conducted online in real time, and the health state of the antenna array plane is mastered in real time. And an implementation way is provided for real-time online automatic array channel monitoring.

The application discloses a dynamic unmanned aerial vehicle cluster electromagnetic characteristic modeling method and system based on a digital array radar, and particularly relates to the following steps: setting radar system parameters, establishing a time-varying motion model of the unmanned aerial vehicle cluster, and obtaining formation pose distribution of the unmanned aerial vehicle cluster in a global coordinate system; performing component decomposition on a CAD model of the unmanned aerial vehicle, performing occlusion analysis under the constraint condition of a radar line of sight, extracting time-varying scattering center parameters according to dynamic electromagnetic effects between targets, updating the spatial distribution of the scattering centers of the unmanned aerial vehicle cluster in a time sequence recursion mode, and completing the construction of a time-varying scattering center model; constructing a radar system signal model according to digital array radar (DAR) parameters, performing multi-dimensional dynamic characteristic extraction and parameter mapping, completing the construction of multi-channel signal modulation of the digital array radar and radar echo of the unmanned aerial vehicle cluster target, and realizing radar scattering electromagnetic characteristic modeling of the dynamic unmanned aerial vehicle cluster. The application improves the model description accuracy and is more efficient in the calculation process.

This invention discloses a micro-ring wavelength locking system and method based on digital perturbation signals. The method includes a global scanning stage and a local locking stage. In the global scanning stage, the optimal digital value of the global DC bias voltage is obtained by increasing the thermal power in equal steps. In the local locking stage, a digital array of periodic sinusoidal perturbation signals is constructed based on the optimal digital value of the global DC bias. After being applied to the micro-ring, an array of photovoltages is obtained at the through-hole. This array is multiplied by the sinusoidal perturbation signal to obtain a mixed signal. The mixed signal is then summed to obtain an error signal. The sign of the error signal is used to determine whether the DC bias voltage has increased or decreased. This invention uses a digital method to generate the perturbation signal and directly converts the micro-ring through-hole signal into a digital signal via an ADC. Digital signal processing is performed inside the processor to extract the error signal. It features low cost, high reliability, and high compatibility with micro-ring wavelength locking requirements of different parameters.

The present invention discloses a method for visualizing global automatic deviation detection in digital area array 3D projections, comprising: establishing a positioning model of a robotic arm and a digital area array 3D projection; establishing a relative positional relationship between the target position of the robotic arm and the digital area array 3D projection positioning model and the object being detected, thereby constructing a global measurement field; planning a path for the robotic arm based on the detection range of the object being detected and the global measurement field to obtain a measurement target path; and obtaining a measurement model of the object being detected based on the measurement target path, and performing a comparative analysis with a theoretical model to achieve global automatic deviation visualization detection in 3D projections. Compared to previous detection methods, the present invention is more autonomous, more accurate, and more comprehensive, enabling global visualization of 3D projections, automated deviation detection, improved detection efficiency, and reduced personnel detection time.

A laser automatic compensation control device includes a controller, a digital array, a decoder, a compensation array and a synchronizer. The controller is configured for receiving a number of laser energy signals and comparing each laser energy signal with a corresponding preset energy value to obtain a corresponding output digital signal. The digital array is electrically connected to the controller and configured for storing the output digital signals. The decoder is electrically connected to the digital array and configured for converting the output digital signals into a number of analog compensation signals. The compensation array is electrically connected to the decoder and configured for storing the analog compensation signals. The synchronizer is electrically connected to the compensation array and configured for receiving the analog compensation signals, and synchronously outputting the analog compensation signals to a laser diode array.

The invention relates to the technical field of radars, in particular to a subarray-level digital array radar transmitting and receiving channel calibration method based on hierarchical calibration, and mainly solves the problem that the transmitting and receiving calibration amplitude-phase control precision of a phase shifter and an attenuator of a subarray-level digital array radar is poor. The method comprises the following steps: acquiring amplitude error data and phase error data of a receiving channel; calculating an amplitude correction value of the receiving channel according to the amplitude fluctuation threshold value, and calculating the amplitude of the receiving channel, a phase calibration control code and a receiving calibration phase quantization error; calculating a receiving amplitude calibration coefficient and a receiving phase calibration coefficient between the sub-arrays; obtaining phase error data of a transmitting channel; calculating a phase calibration control code and an emission calibration phase quantization error of the emission channel; and calculating an emission phase calibration coefficient between the sub-arrays. According to the method, hierarchical calibration in the subarrays and among the subarrays is realized, the residual error of calibration is reduced, an additional calibration channel is not needed, and the method has very high engineering practicability.