69 results about "Digital array" patented technology

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 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 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 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.

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 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 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.

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.

This invention provides a method and apparatus for designing time-varying radiation patterns for a broadband digital array radar, relating to the field of radar processing technology. It includes: using a genetic algorithm to determine the airspace target waveform based on the autocorrelation function, amplitude difference tolerance, and amplitude difference matrix; the airspace target waveform being a waveform with slowly varying rising and falling edges; determining the sub-objective function of the airspace target waveform based on the airspace target waveform, multiple main lobe pointing directions, the signal phase matrix, the expected power spectrum of each main lobe pointing direction, and the signal power spectrum of each main lobe pointing direction; determining the synthesized objective function and its gradient with respect to the signal phase matrix; and performing gradient descent search using the conjugate gradient method based on the gradient, correction coefficients, and an iteration termination threshold to determine the final waveform matrix and the final time-varying radiation pattern. This effectively reduces the probability of radar signals being intercepted by local forces, improves the radar signal's self-interference capability, and achieves modulation of the temporal distribution of airspace electromagnetic energy.

The invention provides a robot scheduling method, a sound source positioning method and equipment, and relates to the technical field of financial science and technology or the technical field of signal processing. The method comprises the following steps: determining the direction of a sound source signal through a mixed analog-to-digital array; distinguishing sound source signals of clients through a voiceprint separation technology; and performing intention recognition on the sound source signal of the client to obtain the voice intention of the client. According to the method, the sound source direction positioning accuracy and the robot scheduling accuracy can be improved.

The invention provides a wheat grain variety detection method and system based on digital array imaging, and the method comprises the steps: firstly collecting an original image of a wheat grain and corresponding hyperspectral data, and carrying out the preprocessing of the image; respectively extracting morphological features, texture features, color features and quality features from the preprocessed image to form four types of independent feature sets; taking the hyperspectral data as input, constructing a plurality of different single-mode models to predict wheat grain varieties, and screening an optimal model as a first spectrum identification model; and taking the four types of independent feature sets and the wheat grain image as input according to independent or combined features, constructing a plurality of different multi-modal feature models, taking the first spectrum identification model as a baseline reference model, and screening an optimal model for wheat grain variety detection. Through adaptive design of terminal deployment and edge computing, the method has the advantages of low power consumption and low delay deployment; the multi-modal feature collaborative recognition mechanism improves the multi-dimensional feature coupling expression ability.

The application discloses a kind of based on key value storage's graph database decimal index encoding and decoding method, belong to graph database management technical field, encoding method includes receiving to be encoded numerical value and its order direction parameter;To be encoded numerical value is normalized, and the sign of the normalized to be encoded numerical value, weight and digital array are extracted;Based on order direction parameter and sign, dynamically generate encoding auxiliary parameter set, and encoding auxiliary parameter set includes sorting mask, escape character and padding character;According to encoding auxiliary parameter set, sign, weight and digital array are converted into binary encoding stream;Data termination mark composed of escape character is added at the end of binary encoding stream;Binary encoding stream is output for the ordered storage and retrieval of data.The application is first decomposed into sign, weight and digital array by decimal value, then encoded using compact binary encoding mode, realizes the efficient storage and query of graph database index.

The application discloses an image texture extraction method, device and computer readable storage medium, the method comprising: converting the color value of each pixel of a target image into a different base to obtain a digital array of each pixel; wherein the base of the color value of the converted pixel is lower than the base of the color value of the pixel before conversion; according to the number of bits of the digital array, the target image is decomposed into several layers; for each layer, a window mask is used to extract texture information to obtain a sub-texture map of each layer; and all the sub-texture maps are superimposed with weights to synthesize a total texture map of the target image. Compared with traditional edge detection technology, the application can greatly improve the texture information extraction rate and texture information extraction accuracy of the target image, and provide more complete texture and edge information for downstream image information processing procedures.

The invention provides an X-band digital array coast defense radar, which relates to the technical field of radars and comprises a coast defense radar body internally provided with a liquid cooling mechanism. The liquid cooling mechanism comprises a bottom plate installed in the coast defense radar body, a liquid cooling plate installed on the bottom plate, a plurality of parallel heat pipes with one ends embedded into the bottom plate, and a liquid cooling assembly for controlling cooling liquid to flow in a liquid cooling channel, and the liquid cooling channel is formed in the liquid cooling plate; the side face of the end, embedded into the bottom plate, of the heat pipe penetrates out of the bottom plate and is attached to the heating end in the coast defense radar body, the heat pipe is of a U-shaped structure, and the end, away from the bottom plate, of the heat pipe penetrates into the liquid cooling channel. The heat of the heating end of the coast defense radar body can be conveniently and efficiently conducted to the cooling liquid, the cooling liquid is controlled to flow through the liquid cooling assembly to achieve rapid cooling, and stable and reliable operation of the radar during long-time high-load work is ensured.

This invention relates to the field of digital array antenna testing technology and discloses a rapid desktop testing method for the receiving pattern of a digital array antenna. The method includes: initializing and synchronizing a multi-channel far-field simulation device and a beamforming processor for the digital array antenna; ensuring that each transmit channel of the multi-channel far-field simulation device is phase-consistent with each receive channel of the beamforming processor through calibration and balancing; establishing a set of scanning angles based on relevant information of the digital array antenna; the multi-channel far-field simulation device generating signals corresponding to the scanning angles and injecting them into the beamforming processor; the beamforming processor extracting information for each corresponding scanning angle and transmitting it to a host computer, until all scanning angles have been traversed to obtain the far-field pattern of each beam, thus completing the entire testing process. This invention can simulate the input of a standard antenna at each incident angle under far-field conditions, enabling the testing and verification of the receiving pattern of the beamforming processor for the digital array antenna.

The application provides a radar echo real-time simulation method based on FPGA and digital array, relates to the technical field of radar system simulation and test, and comprises the following steps: receiving a radar transmitting signal and performing digitization and down-conversion processing to obtain a baseband I / Q signal; in the FPGA, performing multi-scattering point range image generation processing on the baseband I / Q signal to form multiple echo components corresponding to different scattering points of a target; performing micro-motion characteristic modulation processing on the multiple echo components; through a multi-stage phase modulation unit, sequentially performing main Doppler modulation and micro-Doppler modulation on each echo component to generate an echo signal with main motion and micro-motion characteristics; superimposing and synthesizing the echo signal after micro-motion characteristic modulation and a simulated environmental effect signal to obtain a synthesized signal; performing up-conversion and digital-to-analog conversion on the synthesized signal and outputting the synthesized signal to a radar under test through a digital array feed system.

The invention discloses a multifunctional shared digital array antenna system and a working method. The system is obtained by layering and integrating an ultra-wideband tight coupling array plane, a radio frequency digital board assembly and a post-stage DBF assembly. The ultra-wideband tight coupling array plane is a first layer, is composed of a plurality of tight coupling dipole antenna units and is used for radiating or receiving electromagnetic signals; the radio frequency digital board assembly is a second layer and is composed of a plurality of radio frequency digital boards, and the radio frequency digital boards are used for completing filtering, amplification, digital-to-analog conversion, digital frequency conversion and digital multi-beam forming of reconnaissance, interference and communication signals; the rear-stage DBF assembly is a third layer, is composed of a high-performance FPGA, an RF agile transceiver, a clock circuit and an optical module, and is used for completing measurement and compensation of amplitude, phase and delay errors between radio frequency channels of the radio frequency digital board and completing transceiving transmission of beam data and the radio frequency digital board. The invention has the characteristics of low profile, high integration level, multi-modal reconstruction and the like, and is suitable for space-based platforms, unmanned aerial vehicles, mobile combat units and the like.

The application provides a DOA estimation method based on a hybrid analog-digital array architecture design, which comprises the following steps: a hybrid analog-digital array is arranged at a receiving end architecture; the hybrid analog-digital array adopts a low-complexity HAD array architecture; the hybrid analog-digital array architecture is used to receive an incident signal and model; an initial value of an analog phase shifter network is designed; a difference virtual array of the low-complexity HAD array architecture is calculated; an initial angle estimation value is obtained from the difference virtual array receiving signal by using a classical direction finding algorithm; after the initial angle estimation value is obtained, the phase shifter network weight is redesigned, and then a difference virtual array output signal is obtained; and a DOA estimation result is obtained from the classical direction finding algorithm; the method can effectively avoid the problems of phase ambiguity and beam scanning, can reduce the cost and complexity, and can effectively approach the estimation performance of a full-digital array architecture.

The invention relates to a low-altitude radar, in particular to an all-digital array low-altitude early warning radar, which comprises a digital beam forming module, realizes rapid pointing adjustment of beams and simultaneous formation of multiple beams by digitally controlling the amplitude and phase of each array element in an antenna array, and supports omni-directional scanning of a low-altitude airspace and residence in a key area; the broadband signal processing module is used for generating a high-resolution linear frequency modulation LFM signal, completing pulse compression and Doppler processing of an echo signal, realizing distance-speed joint resolution and meeting a low-speed low-altitude target detection requirement; the self-adaptive interference suppression module is used for dynamically suppressing interference in a low-altitude environment and improving the signal-to-noise ratio of a target; the multi-target tracking and decision-making module is used for realizing multi-target state estimation and trajectory prediction and supporting threat level evaluation and alarm decision-making; according to the technical scheme provided by the invention, the defects that the low-speed low-altitude target is difficult to accurately monitor and the low-altitude safety prevention and control capability is insufficient in the prior art can be effectively overcome.

According to the radar digital array directional diagram optimization method based on the genetic algorithm, the radar digital array directional diagram optimization is achieved through the genetic algorithm, complex mathematical derivation is not needed, the method is suitable for a nonlinear scene which is difficult to process through an analysis method, implementation is easy, the solving speed is high, and the method is suitable for large-scale popularization and application. An optimization scheme meeting engineering requirements can be quickly given; by accurately constructing a cost function and combining flexible setting of a weight constraint condition, the method can adapt to various optimization targets, realizes different types of directional diagram optimization of amplitude synthesis, phase synthesis, complex synthesis and the like, and is high in adaptability; the genetic algorithm guarantees population diversity and global search ability through selection, crossover and mutation operation, and compared with a particle swarm optimization algorithm, lower cost function values can be obtained in part of scenes, and the optimization effect is better; meanwhile, through the arrangement of the main lobe separation mark, the minor lobe adjustment process is simplified, and the engineering practicability is improved.