62 results about "Impulse radar" patented technology

Monitoring object movement comprises attaching an ultra-wide band (UWB) sensor to an object and transmitting, by the UWB sensor in a radar mode, a plurality of UWB pulses. The UWB sensor in the radar mode receives a plurality of reflected UWB pulses and determines over a time a channel response (CIR) based on the plurality of transmitted and reflected UWB pulses. The CIR is indicative of the object movement.

The invention discloses a pulse compression radar accelerator generation method based on model driving, and relates to the technical field of pulse radars, and the method comprises the steps: based on a pulse compression radar signal processing flow, splitting operators according to calculation, interconnection and storage dimensions, and extracting features; defining 9 types of core components to form a parameterized component library; the components and the connection relation are combined, and an architecture description graph in a JSON format is generated; analyzing the ADG through an architecture interpreter to obtain a standardized parameter, and generating an RTL code based on a Chisel hierarchical architecture; performing simulation verification on the RTL code, pre-estimating the resource if the simulation verification is passed, and returning an error if the simulation verification is not passed; injecting expert configuration and combining with Latin hypercube sampling to obtain an initial solution set, iteratively searching a high-quality solution cluster by a TPE algorithm, resetting a parameter boundary and then switching to an ILS algorithm, and combining with a hardware rule to obtain a global optimal solution; and repeatedly executing the steps until the end conditions that the resources reach the standard and iteration reaches the upper limit are met, and outputting the accelerator architecture with the optimal resources under the target application constraint and the complete RTL code.

The application discloses a kind of foil cloud cluster time-domain scattering characteristic analysis method based on modulated Gaussian pulse radar, specifically includes: the size of foil cloud cluster, the number of foil, length, radius, position coordinate, attitude angle are determined by Matlab;Foil cloud cluster modeling is completed using the method of Matlab-CST joint simulation;The scattering characteristics of foil cloud cluster are analyzed using finite integration algorithm, and the time-domain echo of foil cloud cluster is obtained;Change receiving angle, obtain the time-domain echo of foil cloud cluster from the same angle incidence at different angles receiving electromagnetic wave.The application completes foil cloud cluster modeling by the method of Matlab-CST joint simulation, and the time-domain echo of foil cloud cluster is obtained by time-domain finite integration algorithm, fully considers the influence of randomness and overlapping of foil distribution on time-domain echo.

The application provides a multi-domain extremely narrow pulse radar echo target fusion recognition method based on scattering center matching degree constraint and structural feature auxiliary constraint, constructs an end-to-end classification model for multi-frequency and multi-polarization fusion recognition of an extremely narrow pulse radar echo, can perform feature extraction on input multi-frequency and multi-polarization extremely narrow pulse radar echoes and fusion of frequency dimension and polarization dimension information, and then directly recognizes the fusion features, realizes end-to-end fusion recognition integration, adopts deep learning technology based on feature level fusion, can more fully utilize feature information contained in samples, makes the model make more accurate and stable decisions in the classification task. The method fully mines the correlation between multi-frequency and multi-polarization information, fuses the frequency dimension and polarization dimension information mined, utilizes rich scattering information of multi-frequency and multi-polarization extremely narrow pulse radar echoes, and achieves a relatively ideal target recognition effect.

Pulsed radar by hybrid pulsed and frequency modulation approach. Radar device comprising: - a transmit channel (1) configured to generate a radar signal (IE); and - a receive channel (2) configured to receive echoes (SE) and demodulate them synchronously so as to extract time-of-flight information; characterized in that the transmit channel (1) and the receive channel (2) comprise: - a shared local oscillator (1204), having a variable frequency according to a control signal; - a generator (1202) of said control signal, adapted so that the frequency of said local oscillator varies in time either linearly or linearly in steps, with possible temporal scrambling;and- means for shaping (101, 201) pulses to generate a series of transmit pulses (IE) and a corresponding series of receive demodulation pulses (IDR), each receive demodulation pulse having a duration greater than that of the corresponding transmit pulse and defining a respective time range for receiving echoes. Figure for the abstract: Fig. 1;

The invention discloses a signal sending method and device. According to the method, information of a preset single-time sending duration and information of a preset sending time interval are obtained in response to a signal sending request, and the single-time sending duration and the sending time interval are both in positive correlation with a first distance between a sending device and a target object; according to the information of the single sending duration and the information of the sending time interval, determining the information of a single sending time period and the information of a sequence number corresponding to each single sending time period; in a preset corresponding relation between a sequence number and a sub-waveform signal, obtaining a target sub-waveform signal corresponding to the target sequence number, the target sequence number being a sequence number corresponding to the target single sending time period; and sending the target sub-waveform signal in the target single sending time period. According to the embodiment of the invention, the method can solve a self-interference problem when a wide pulse radar signal is used for measurement in a small darkroom environment, and guarantees the accuracy of a measurement result.

The invention discloses a broadband achromatic programmable electromagnetic camouflage device based on a fluid access metasurface. The broadband achromatic programmable electromagnetic camouflage device comprises the fluid access metasurface composed of a plurality of periodically arranged super units. Each super unit comprises a plurality of units arranged in a matrix; each unit comprises a microfluid channel layer and a solid metal layer, and the microfluid channel layer is located above the solid metal layer; the microfluid channel layer is connected to an external driving system through the injection and discharge port, and the external driving system is used for injecting liquid metal or dielectric liquid into the microfluid channel layer; when the microfluid channel layer is filled with liquid metal, the unit is in a first working state; and when the micro-fluid channel layer is filled with the dielectric liquid, the unit is in a second working state. According to the invention, linear phase dispersion control can be realized in a broadband, and it is ensured that the generated false target echo keeps high fidelity in a time domain when facing a broadband pulse radar.

The invention discloses an adaptive radar signal detection method and system based on reinforcement learning. The method comprises the following steps: S1, collecting pulse radar echo signals; s2, dividing a reference unit and a to-be-detected unit for the signal; s3, extracting basic features of the reference unit and the to-be-detected unit signals; s4, extracting deep features of the reference unit signals; s5, extracting deep features of the to-be-detected unit signal, and outputting a confidence coefficient; s6, inputting the joint deep features of the reference unit and the to-be-detected unit into a reinforcement learning agent as a state, and adjusting an action output detection threshold by the agent based on the current state; s7, performing target detection on the to-be-detected unit, and calculating a reward value; s8, repeating the steps S3-S7, constructing empirical data, training and updating the intelligent agent by adopting a reinforcement learning algorithm, and outputting a signal detection decision intelligent agent model; and S9, obtaining a confidence coefficient after the test set passes through the steps S3-S5, inputting the deep features into the trained intelligent agent to obtain a threshold, judging that the intelligent agent with the confidence coefficient exceeding the threshold value is a signal, and otherwise, judging that the intelligent agent is a noise.

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.

A pulse radar device for performing a signal processing operation is provided, which includes a transmitting unit that radiates a transmission signal, a receiving unit that receives a reception signal from a target, and a signal processing unit that generates output codes based on the reception signal. The signal processing unit includes a plurality of integrators that generate integration signals based on the reception signal, a plurality of analog-to-digital converters (ADCs) that generate the output codes based on the integration signals, a clock controller that provides clock signals to the plurality of integrators and the plurality of ADCs, a voltage generator that applies an adaptive reference voltage to the plurality of ADCs, and a controller that determines whether to repeat the signal processing operation based on the output codes and the threshold value.

The invention relates to the field of radar measurement, in particular to a method for filtering strong target echoes outside a pulse radar fuzzy distance, which is applied to equipment in the field for accurate distance measurement. According to the method for filtering out the strong target echo outside the fuzzy distance of the pulse radar, the common hardware composition of the pulse radar is not changed, the staggered solution range ambiguity design is not adopted, and the strong target echo outside the fuzzy distance of the pulse radar can be filtered out by designing the working frequency of each pulse in the radar transmitting pulse string; and distance ambiguity caused by strong target echoes outside radar ambiguity distance is solved. The method can be applied to the design of a new pulse radar product, and the unambiguous distance of the radar can be improved by transforming the existing pulse radar.

A radar system that uses a range walk compensation algorithm to reduce system losses resulting from moving targets. During the coherent integration of pulse radar systems, the conventional Fast Fourier Transform (FFT) for Doppler processing needs to change the input range bin number in accordance to the velocity of the target. The algorithm allows for configuration of Doppler groups to compute several Dopplers with one FFT. Each Doppler group has a transform Doppler that is close to the center of the group which will dictate the change of range bins for the input data to the FFT. As the range bins are changed, there are two input filter techniques: nearest bin select, and 2-tap filter. After range walk compensation processes all Doppler groups by FFT, the resultant output block has much higher coherent integration as compared to just a conventional FFT.

The application discloses a single / dual-channel signal alternating adaptive processing method of pulse radar Doppler power spectrum, and belongs to the technical field of radar signal processing. The method comprises the following steps: reading power spectrum data of a radar, pre-processing the power spectrum data to obtain stretched power spectrum density; establishing a velocity sequence according to the stretched power spectrum density, automatically determining an optimal signal number, estimating expectation, variance and mixing coefficients of each Gaussian component and taking the initial spectral moment parameters; taking the optimal signal number and the initial spectral moment parameters as initial values, iteratively fitting the stretched power spectrum density to obtain the amplitude, expectation and variance of each Gaussian component; reconstructing the power spectrum density of the Gaussian component with non-negative amplitude, and outputting the echo power, average Doppler velocity and spectral width of each effective signal; and the application determines the signal number in the pulse radar Doppler velocity power spectrum through self-adaption, and significantly improves the universality and automation level of the signal processing method.

A radar measurement device and a radar measurement method are provided that use a digital delay circuit to easily adjust the difference between the time a radar wave passes through a transmitting device and the time it passes through a receiving device. [Solution] A radar measurement device 1 that transmits pulsed radar waves, receives echoes reflected from the radar waves, and performs predetermined measurements based on the echoes includes a transceiver circuit (transceiver means) 3 and a processing circuit (arithmetic means) 4. The transceiver circuit 3 generates pulsed radar waves, transmits the generated radar waves, and receives echoes that are reflected waves of the transmitted radar waves. The processing circuit 4 includes a digital delay circuit 41 that outputs the radar waves transmitted by the transceiver circuit 3 or the echoes received by the transceiver circuit 3 after a specified time based on input parameters.

This invention discloses a millimeter-wave high-amplitude and phase-coherent single-pulse sum-difference network, belonging to the field of single-pulse radar. The sum-difference network is a symmetrical planar structure, including two first-order planar magic-Ts, two second-order planar magic-Ts, two 90° twisted waveguides, four 90° waveguide turning structures, and an electromagnetic bandgap structure disposed around the network. The first-order and second-order planar magic-Ts are identical planar magic-Ts, composed of an H-plane power divider and an E-plane waveguide. The electromagnetic bandgap structure includes an interleaved slot electromagnetic bandgap structure and a metal pillar electromagnetic bandgap structure. This invention employs an integrated planar structure, requiring only one-time processing and assembly, significantly reducing processing and assembly errors. Simultaneously, the planar magic-Ts are designed to effectively avoid the inherent dispersion defects of bridges and phase shifters, achieving high amplitude and phase coherence over a wide bandwidth. Furthermore, the use of a hybrid electromagnetic bandgap structure reduces the fabrication difficulty of the device while preventing electromagnetic leakage.

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.

The invention provides a marine radar performance monitor system based on frequency sweep, which comprises a radar antenna, a magnetron pulse transmitting module, an echo receiving module, a display module, a PM antenna, a receiving and detecting module and a regular image transmitting module, and is characterized in that the output end of the magnetron pulse transmitting module is connected with the input end of the radar antenna; the output end of the radar antenna is connected with the input end of the echo receiving module, the output end of the echo receiving module is connected with the input end of the displayer, the output end of the PM antenna is connected with the output end of the receiving and detecting module, and the output end of the receiving and detecting module is connected with the input end of the regular image transmitting module. The output end of the regular image transmitting module is connected with the input end of the PM antenna, the regular calibration pulse width can be broadened and can be stably kept within the response range of the echo receiving module, and the problem that the transmitting width of a pulse radar of a traditional marine radar performance monitor system is narrow is solved.

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 present application relates to radar technical field, especially to a kind of same frequency pulse radar multi-station cooperative tracking method based on phase information interconnection, the method is based on radar network system implementation, the radar network system includes at least two same frequency pulse radars and a control terminal, the method includes the following steps: S10, each pulse radar gathers own phase information, and sends to control terminal;S20, control terminal receives the phase information sent by each pulse radar, and according to phase information, pulse radar quantity, pulse radar's station information and target position information, calculates the phase control deviation value of each pulse radar, and sends each phase control deviation value to corresponding pulse radar;S30, each pulse radar receives the phase control deviation value sent by control terminal, and controls own phase according to the phase control deviation value.By the present application, the same frequency interference problem of pulse radar chain can be fundamentally solved.

Railroad crossing object detection systems and methods include radar sensors detecting object presence, speed and heading in a different manner. A controller compares signal outputs from the different sensors to provide traffic control preemption signals and self-diagnose sensor problems. The sensor devices may include an ultra-wideband (UWB) impulse radar device and at least one reflective device providing failsafe object presence detection and object non-presence detection in redundant fashion with at least a second sensor device such as a side-fired radar device.

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.

Fig 8 The application relates to a radar system for measuring moving objects. The radar system comprises a pulse generation means being switchable between a Doppler radar mode and a pulse radar mode,

The invention provides a multi-pulse radar detection system and method for resisting harmonic deception jamming, and the method comprises the steps: transmitting pulse signals with a plurality of frequency modulation slopes through differential setting, and carrying out the pulse compression of received waves; according to the characteristic that the position of a real target is fixed and the position of a false target is shifted during pulse compression processing of radar signals with different parameters, the purposes of energy accumulation at the real target and false peak energy elimination at the false target are achieved by analyzing the time-domain characteristics after pulse compression processing of the signals and performing combined processing. According to the method, additional auxiliary judgment is not needed, self-adaptive processing capacity is achieved for position judgment and energy elimination of all pseudo peaks, meanwhile, simple calculation modes such as query, addition and subtraction are mainly adopted in the algorithm, and the method has the advantage of being small in calculation amount.

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 application discloses a single-photon laser ranging method based on laser pulse frequency modulation deblurring, and belongs to the field of laser ranging. In the ranging process, two different pulse frequency references are set to correspond to two encoding code elements, n-bit random codes are generated according to n times non-blurring distance expansion requirements, and the n-bit random codes are ensured to have no shift symmetry, then a laser source repeatedly emits corresponding pulse signals according to a sequence represented by the random codes, then a sequence of echo signals is received, a single-photon cumulative histogram is obtained, and a cross-correlation operation is performed on the single-photon cumulative histogram and the pulse sequence represented by the known random codes to obtain an operation result, one having the maximum amplitude in the operation result is determined, and a histogram time position corresponding to the operation result is calculated, that is, a ranging result without blurring can be calculated. The application can overcome the distance blurring problem of pulse radar ranging, and the time sliding sequence matching method proposed in the cross-correlation operation has the characteristics of high efficiency and flexibility, and effectively reduces the time complexity of the cross-correlation operation.

A motion recognition method may include receiving a plurality of frame signals based on radar pulses reflected from a target at different times, generating a plurality of micro-range enhanced frame signals obtained by reinforcing a component of a second region having more movement than movement of a first region among the plurality of frame signals, generating a micro-range enhanced frame set formed by stacking the plurality of micro-range enhanced frame signals at preset time intervals, generating a micro-range enhanced radar image which is an image obtained by viewing the micro-range enhanced frame set in a direction perpendicular to a time axis of the micro-range enhanced frame set, and determining motion of the target by inputting the micro-range enhanced radar image to a machine learning-based learning model.

The present application belongs to the technical field of radar ranging, and particularly relates to an integer cycle acquisition method and device for pulse radar carrier phase ranging. The specific process of the method is as follows: step one, after target acquisition, a distance tracking loop is started to realize target echo envelope center tracking, and when the distance tracking loop meets the locking condition, an integer cycle acquisition loop is started; step two, the integer cycle acquisition loop is used to acquire an integer cycle for carrier phase ranging, and in the process of acquiring the integer cycle, a stable domain constraint, online stability judgment and bandwidth rollback mechanism are used to avoid dynamic instability caused by too narrow bandwidth, so that a smooth coarse distance and reliable integer cycle meeting the integer cycle judgment standard deviation constraint are obtained. The method and device can be used for reliable integer cycle acquisition in pulse radar carrier phase ranging.