27 results about "Impulse radar" patented technology

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 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.

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 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.

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.

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.

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.

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 application discloses a vehicle sentry low-power consumption hierarchical wake-up method and system based on pulse radar, and relates to the technical field of radar detection.The method comprises the following steps: transmitting a radar signal under static state, and constructing a perturbation echo baseline; evolving the difference between continuous echoes and the baseline, and establishing a first perturbation offset; positioning an anomaly according to the first perturbation offset, taking distance features, and establishing a second perturbation offset; determining spatial stability in combination with the two offsets; switching to enhanced sampling when instability occurs, and forming target motion description; and configuring hierarchical wake-up and executing perception management according to the target motion description.The application solves the technical problem that the existing vehicle sentry monitoring system has high power consumption and is difficult to balance the environmental perturbation recognition accuracy and the timely wake-up response of abnormal targets under the static guard scene of continuous high-frequency perception, and achieves the technical effects of realizing accurate anomaly disturbance determination, target motion enhanced perception and hierarchical wake-up management on the basis of low-power consumption static monitoring, reducing the whole vehicle standby power consumption, and improving the vehicle sentry monitoring reliability and response efficiency.

The application discloses a kind of three-dimensional super-resolution imaging method and device based on forward-looking SAR, in the process of airplane flight, every time interval adopts one-dimensional linear array to emit linear frequency modulation signal and receive echo, obtains multiple groups of echo data;In single echo reception, each array element sequentially receives in order, which is equivalent to single pulse radar produces movement along array direction, obtains similar echo data with SAR imaging in forward-looking area;Azimuth desloping processing is carried out to each group of echo data, and is transformed to frequency domain using iterative adaptive method, i.e. azimuth direction super-resolution can be realized;Subsequently, all echo data of the same azimuth are selected for processing, the echo is phase compensated by grid search, and combined with data extrapolation algorithm, super-resolution is realized in track-height direction.Compared with the traditional forward-looking SAR imaging algorithm, the application overcomes the limitation of array antenna size on resolution, uses super-resolution method, so that super-resolution is realized in three-dimensional direction.

The utility model relates to the technical field of radar correction, in particular to an unmanned aerial vehicle pulse radar correction device which comprises a supporting platform. A correction mechanism is installed at the bottom of the supporting platform, and a balance mechanism is installed at the bottom of the correction mechanism. The top of the supporting platform is fixedly connected with a radar body, the top of the radar body is fixedly connected with an obliquely-arranged control panel, the bottom of the connecting base is fixedly connected with a balance mechanism, the bottom of the connecting base is rotatably connected with a fixing rod, the outer side of the fixing rod is slidably connected with a sliding rod, and the top of the sliding rod is fixedly connected with a sliding sleeve. The platform can be supported to keep horizontal by adjusting the fixing rod and the sliding rod, one end of the fixing screw is in contact with and abuts against the fixing rod by rotating the fixing screw, and at the moment, the fixing rod and the sliding rod can be fixed. It is ensured that the upper supporting platform is in a horizontal state, and receiving and sending of signals of the control panel are ensured.

The application discloses a target detection method of a linear frequency modulation pulse radar and relates to the field of radars. The application comprises the following steps: acquiring a radar transmitting signal and a target echo signal; performing a fast Fourier transform on the radar transmitting signal and the target echo signal after mixing, filtering and sampling to obtain a signal spectrum; acquiring a Doppler frequency caused by target movement through a frequency corresponding to a peak value in the signal spectrum and a harmonic frequency of a transmitting signal pulse repetition frequency closest to the frequency; calculating a target speed; performing a difference frequency estimation on the radar transmitting signal and the target echo signal; acquiring a difference frequency caused by target echo distance delay through the difference frequency and the Doppler frequency; and calculating target distance information. The application completes target speed and distance measurement after performing a Fourier transform on the echo, improves the real-time performance of the algorithm, and makes the algorithm structure easy to implement.

This invention discloses a method for ultra-narrow pulse radar target recognition using prior knowledge-assisted multi-classifier fusion, belonging to the field of radar target recognition technology. This method introduces prior conceptual information about the target into the automated construction process of a tree-like hierarchical structure, compensating for the knowledge deficiencies of data-based automated construction methods. The difficulty of distinguishing between classification nodes in the constructed tree structure is significantly reduced. Therefore, even in recognition scenarios with numerous categories and insufficient data, this invention's method still exhibits good performance in refined target recognition.

The invention discloses a radar signal increment sorting recognition method and system based on pulse stream synthesis playback, mainly solving the problem of poor increment sorting recognition effect in the prior art, and the implementation scheme comprises the following steps: obtaining a radar signal pulse description word sequence collected offline and a corresponding pulse-by-pulse radar tag; dividing the training data into a plurality of pure subsequences, adding the pure subsequences into a memory bank taking a category as a unit, extracting the pure subsequences from the memory bank according to a category probability, and performing time translation and interleaving synthesis to generate an aliasing playback sample; iteratively training the neural network by using the aliasing playback sample, and obtaining a trained incremental neural network through verification; a radar signal pulse description word sequence to be sorted and recognized is obtained in real time and input into the trained incremental neural network to obtain pulse-by-pulse radar tags, and deep feature scoring and stratified sampling results are obtained through various types of pure subsequences input into the network to maintain a memory bank. The method can improve the effect of incremental sorting recognition, is high in generalization ability, controllable in training cost and high in overall efficiency, and can be used for electronic reconnaissance in a dynamic signal environment.

The embodiment of the application provides a pulse radar transmitter chip and electronic equipment, and belongs to the chip technical field.The pulse radar transmitter chip comprises a direct pulse generation circuit, a full-digital power amplifier and an output matching network which are sequentially connected.The direct pulse generation circuit works at an ultra-wideband frequency and comprises a pulse generation sub-circuit and a pulse modulation sub-circuit.The pulse generation sub-circuit is used for generating at least n delay different pulse signals, and n is an integer greater than or equal to 2.The pulse modulation sub-circuit is m, which is used for modulating the pulse signals on the pulse signal output end of the pulse generation sub-circuit into pulse control signals, and m is an integer greater than or equal to 1.The embodiment of the application can generate high-precision radar pulse signals, and the whole circuit is a full-digital circuit, so that the power consumption is low, thereby improving standby and working time of the UWB system whole machine based on the chip.

A system may include a first signal generator communicatively couplable to a first antenna via a switch and configured to generate a carrier signal for a pulsed radar signal. A system may include a second signal generator communicatively couplable to the first antenna via the switch and coupled to an image reject mixer, the second signal generator configured to: transmit, when the first signal generator is communicatively coupled to the first antenna, a local oscillator continuous wave signal to the image reject mixer, and transmit, when the second signal generator is communicatively coupled to the first antenna 1) a first frequency modulated continuous wave signal via the first antenna, and 2) a second frequency modulated continuous wave signal to the image reject mixer, wherein the third continuous wave is mixed with a reflection of the first frequency modulated continuous wave signal received by the second antenna.

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

The application provides a target detection method based on FMCW-OAM radar target imaging. Since the vortex electromagnetic wave carries the orbital angular momentum OAM, more target information can be provided in radar imaging and target detection. The vortex phase is added in the traditional frequency-modulated continuous wave FMCW radar, the azimuth angle imaging performance of the FMCW radar is improved, the measurement accuracy is not affected by the actual azimuth angle of the target, the distance and the speed of the target, and the azimuth angle detection range is widened. Compared with the pulse OAM radar, the FMCW-OAM radar has the advantages of small short-distance detection blind area, high measurement accuracy, low power consumption and low sampling frequency.

An ultrashort-range target detection pulse radar system according to the present invention comprises: an antenna unit for propagating a transmission pulse and receiving a signal reflected from a target; a transceiver unit including a plurality of transceiver modules and individually controlling a transmission amplifier and a reception amplifier included in each of the plurality of transceiver modules; a signal processing unit for processing a signal received from the transceiver unit; and a control unit for controlling selection of positions of the transmission amplifier and the reception amplifier to minimize interference therebetween.

An antenna for a pulsed radar, the antenna comprising: a functional antenna part including a conductive portion and a resistive portion, the functional antenna part being capable of occupying a first electrical state in which the resistive portion has a first electrical resistance value, and at least a second electrical state in which the resistive portion has a second electrical resistance value greater than said first electrical resistance value; a control mechanism capable of occupying a first position causing the functional antenna part to occupy the first electrical state, and at least a second position causing the functional antenna part to occupy at least one second electrical state. Figure 2a

The application relates to a millimeter wave radar gesture recognition method based on envelope data feature extraction, belonging to the technical field of millimeter wave radar application. Millimeter wave radar is used to collect data of different gestures to form envelope data, and the data is packed and saved in txt or mat format for subsequent processing; all packed data is read by Matlab, feature quantities of all data are directly calculated, and feature quantity scatter diagrams are drawn according to all permutations and combinations of the feature quantities; three feature quantities with the largest scatter point separation of different gestures are selected from the scatter diagrams, that is, the scatter points of different shapes are most obviously separated, and the feature quantities are used for gesture discrimination; interval division is carried out, and different intervals of each feature quantity correspond to different gesture determination. The application uses a single-transmitting single-receiving narrow pulse radar to collect gesture data and uses the method to perform gesture recognition and classification, so that a higher gesture recognition accuracy is realized by using a simpler algorithm and lower calculation complexity.