64 results about "Pulse echo" patented technology

The invention discloses a multi-medium three-dimensional flaw detection system based on ultrasonic pulse echoes. The multi-medium three-dimensional flaw detection system comprises a synchronous data acquisition module, a temperature compensation module, a multi-physical field simulation optimization module, a signal processing module and a three-dimensional imaging and output module, the synchronous data acquisition module scans an object, records coordinates and synchronously transmits and receives ultrasonic echoes; the temperature compensation module calculates real-time sound velocity according to the water temperature, the real-time sound velocity is used by the multi-physics field simulation module, and the multi-physics field simulation module simulates sound wave propagation and generates a defect-free theoretical waveform as a reference by combining intrinsic parameters of an object and sound wave propagation parameters; the signal processing module carries out processing and feature extraction on actually measured echoes, and compares the actually measured echoes with a reference to identify defect signals; and the three-dimensional imaging module associates the signals with the coordinates, a three-dimensional model is generated by adopting slice reconstruction and a compressed sensing algorithm, and defects are visualized, so that the precision, the efficiency and the environmental adaptability of three-dimensional flaw detection can be improved.

The invention provides a filling pipeline leakage monitoring and positioning method, device and equipment and a storage medium, and relates to the technical field of pipeline monitoring. The method comprises the following steps: acquiring time-varying data of pressure in a pipeline through a pressure sensing unit, and identifying leakage triggering characteristics; transmitting a pressure pulse wave at the starting end of the pipeline and receiving an echo signal, and calculating a pressure wave propagation speed under the current working condition according to the echo signal; and the arrival time of the pressure waves arriving at the sensors is extracted, and based on the pressure wave propagation speed and the pressure wave arrival time difference, leakage point coordinates are obtained through calculation. According to the method, the leakage characteristics are rapidly identified through real-time pressure collection, the real-time wave velocity under the current working condition is obtained through the active pulse echo technology, and the wave velocity calculation deviation caused by medium characteristic changes is effectively eliminated; and the actually measured wave velocity and the time difference of arrival are combined for calculation, so that error accumulation in long-distance transportation is overcome, and the precision and reliability of pipeline leakage positioning are remarkably improved.

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 application relates to the technical field of radar signal processing, and discloses a time-frequency domain combined pulse compression processing method for long-pulse high-resolution wind measurement, which comprises the following steps: long-pulse echo data is acquired and subjected to local time-frequency block processing; a theoretical track of a candidate distance unit in a time-frequency plane is constructed according to a propagation time delay; track time-frequency coefficients are extracted, and a frequency domain consistency factor, a local time-frequency energy focusing factor and a Doppler consistency factor are calculated; combined compression weights are generated; the amplitude of a time domain matched filter output is adjusted and the phase information is kept; combined pulse compression output is obtained; and Doppler spectrum estimation is carried out to obtain radial wind speed information. According to the application, the long-pulse echo data is subjected to local time-frequency block processing, and a theoretical track is constructed, so that the frequency domain consistency factor and the local time-frequency energy focusing factor are calculated, thereby reducing distance sidelobe leakage and improving distance resolution capability.

This invention discloses a clutter false alarm suppression method based on multi-feature fusion, comprising: acquiring radar echo signals and performing pulse compression processing to obtain time-domain echo data; performing clutter suppression and coherent accumulation on the time-domain echo data to obtain a range-Doppler matrix; performing constant false alarm detection on the range-Doppler matrix to obtain several potential target points; extracting the multi-pulse echo signals and unsuppressed frequency domain signals corresponding to the potential target points from the time-domain echo data, extracting the corresponding clutter-suppressed frequency domain signals from the range-Doppler matrix, and constructing multi-dimensional features for each potential target point based on the extracted signals; inputting the multi-dimensional features into a pre-trained classifier, determining whether the potential target point is a target or false alarm clutter based on the output results, and outputting the final target point trace. This invention effectively suppresses clutter false alarms in complex environments and improves radar detection reliability through multi-dimensional feature fusion and secondary decision-making by the classifier.

Method of operating a detection radar and associated detection radar. The present invention relates to a method of operating a target detection radar (10) using a first radar mode and a second radar mode corresponding to Doppler modes. The method comprises the implementation of several repetitions of a signal transmission / reception step (110), each Nth repetition of said step (110) comprising the following substeps: + generation (111) of two consecutive pulses associated with the different radar modes and different transmission directions; + transmission (112) of the pulses in different frequency bands, the pulses associated with the different radar modes being emitted using different slopes of the chirps used to emit them; + reception (113) in a common time window of the pulse echoes. Figure for the abstract: Figure 4

The application discloses a kind of high-resolution ultra-wide imaging method and system based on intra-pulse multi-beam, wherein the method comprises: each sub-pulse echo signal is filtered to obtain each sub-mapping band echo signal;Each sub-mapping band echo signal is processed to obtain the output signal of each receiving channel;According to the time-varying weighting coefficient of each receiving channel and the output signal of each receiving channel, the signal after DBF processing of each receiving channel is obtained;Each receiving channel DBF processed signal is processed to obtain each sub-mapping band signal;Each sub-mapping band signal is two-dimensionally focused to obtain the SAR image of each sub-mapping band region;The SAR image of each sub-mapping band region is spliced in range direction, and high-resolution ultra-wide SAR image is obtained.The application effectively solves the problem that traditional spaceborne SAR system is difficult to realize high-resolution and ultra-wide imaging simultaneously.

An intravascular ultrasound transducer assembly for monitoring stiffness of a vessel wall. The assembly comprises a catheter shaft sized and shaped for insertion inside a vessel having a vessel wall and one or more intravascular devices integrated on the catheter shaft. The one or more intravascular devices are configured to monitor at least one of i) at least one anatomic structure of the vessel wall in response to a pulse wave being launched on the vessel wall so that a pulse wave velocity is determined, by operating in a pulse echo mode to track the at least one anatomic structure, and ii) signals indicative of an ambient pressure of the ultrasound transducer assembly, wherein the ambient is defined by a balloon encapsulating one of the one or more intravascular devices. The pulse wave velocity and the ambient pressure are related to, i.e., proportional to, the stiffness of the vessel wall.

Phase-based methods can be used for one or more of acquisition, storage, or subsequent analysis (e.g., A-scan reconstruction or full focus method imaging) to support acoustic inspection. For example, binarization or other quantization techniques can be used to compress the amount of data associated with time series signal acquisition. A representation of phase information from the time series signals can be generated, e.g., by processing the binarized time series signals or otherwise quantized time series signals. As an illustrative example, using the representation of phase information, one or more A-scan reconstructions can be performed using phase summing techniques, e.g., for pulse echo A-scan inspection, or TFM imaging techniques can be used. In such phase summing methods, the time series representations of phase data can be summed, e.g., where each time series can be delayed (or phase-rotated) by an appropriate delay value, and then aggregated.

The invention provides a laser radar target echo generation device, and relates to the technical field of laser radar target characteristic digital simulation and high repetition frequency narrow pulse laser echo regeneration. According to the device, through a laser radar body target echo simulation system, a body target simulation model matched with a body target is screened out from a typical target model library; performing multi-channel optical characteristic simulation on the body target by using the laser radar, and generating body target echo simulation data of the laser radar on the typical target under different rendezvous conditions; the laser radar body target echo generation module is used for carrying out pulse echo detection of which the half bandwidth is in a nanosecond level according to the body target echo simulation data; a pulse current signal is converted into an electric pulse signal in an undistorted manner, the electric pulse signal is converted into an optical pulse signal in an undistorted manner, and the optical pulse power in a single pulse is modulated in real time. The problems that the target echo generated by the existing laser radar point target echo generation device is simple in characteristic and the real characteristic of the echo is difficult to simulate are solved.

The invention discloses a radar altimeter data processing method and device and a storage medium, and relates to the technical field of radar altimeter data processing. The method comprises the following steps: carrying out processing and target detection on all echo signals to obtain potential target points; dividing M pulse echo data in one frame into a plurality of data segments with different accumulation lengths; for each potential target point, calculating coherent accumulation energy of the potential target point in each data segment; according to the change rule of coherent accumulation energy of the potential target points among the data segments, incoherent interference target points are discriminated and filtered out; sorting the residual target points after filtering according to energy, and selecting Q target points with the highest energy for tracking; and comparing the energy of each target tracking chain in the historical frame, and taking the distance value corresponding to the target tracking chain with the highest energy as the final output value of the radar altimeter. According to the invention, data jump is greatly suppressed from a data source, and the problem of lack of capability of suppressing power supply fluctuation and electromagnetic interference is solved.

The application provides an underwater single-photon lidar target reconstruction method based on modal fusion and collaborative variational imaging optimization, comprising the following steps: reconstructing the original echo data of the underwater single-photon lidar into a superimposed photon number sequence corresponding to X*Y pixel points, wherein the superimposed photon number sequence corresponding to each pixel point is generated by performing photon number superposition based on a time bin grid on the multiple laser pulse echo signals received at its position, and the number M of laser pulses for performing photon number superposition on each pixel point is the same; performing depth-reflectivity estimation based on modal fusion on the superimposed photon number sequence of each pixel point to obtain a depth map and a reflectivity map of the underwater target; and optimizing the depth map and the reflectivity map of the underwater target based on a collaborative variational imaging optimization strategy. Using the method provided by the application, a high-quality reconstructed image of the underwater target can be quickly obtained.

Method of operating a detection radar following at least one observation operating mode using chirp slopes and associated detection radar. The present invention relates to a method of operating a target detection radar following at least one observation operating mode of a portion of the radar's environment, the method comprising the implementation of several repetitions of a signal transmission / reception step, each Nth repetition of said step comprising the following substeps: - generation of a sequence of consecutive pulses, each pulse of the sequence being associated with a respective observation zone, each observation zone being different, - transmission of the pulses in different frequency bands, the pulses associated with each observation zone being emitted using different chirp slopes used to transmit them.and - reception of pulse echoes within a common time window. Figure for the abbreviation: Figure 5,

This invention discloses a method for resisting dense false target interference based on complex empirical mode decomposition, comprising the following steps: S1: detecting false targets; S2: performing CEMD decomposition on each group of pulse echoes in the false targets to obtain several intrinsic mode functions (IMFs); S3: solving for the centroid IMF based on the IMFs and the phase projection direction. ZX The projections in all directions are averaged, and the centroid IMF is calculated. ZX S4: Recover the intrinsic mode function (IMF); S5: Solve the centroid IMF of each pulse echo. ZX The intrinsic mode function (IMF) components with high correlation to the transmitted signal are retained, while those with poor correlation are removed, resulting in a multi-pulse signal after interference suppression. The purpose of this invention is to suppress the dense false target deception interference suffered by traditional radar systems.

The invention relates to the technical field of ground clutter suppression, in particular to a security radar ground clutter suppression method, system and device and a storage medium, and the method comprises the following steps: receiving a pulse echo signal, inputting the pulse echo signal into a dynamically updated time-varying clutter model, and obtaining a self-adaptive suppression result; performing two-dimensional fast Fourier transform and constant false alarm detection on the self-adaptive suppression result to obtain a constant false alarm detection result; and by calculating the mean square error of signal points in the constant false alarm detection result and evaluating the signal quality, determining ground clutter diffusion points in the constant false alarm detection result and filtering the ground clutter diffusion points to obtain a pulse echo signal after clutter suppression. According to the method, ground object static clutters can be effectively inhibited, the detection capability of target signals with the target speed close to zero frequency and Doppler frequency is reserved and enhanced, residual clutter diffusion points can be further inhibited, and the overall false alarm is reduced.

The invention discloses an ultrasonic online detection system for continuously winding a glass reinforced plastic pipe, which belongs to the technical field of pipeline nondestructive testing and integrates a multi-channel ultrasonic detection module, an ultrasonic probe, a water tank, a water storage tank, a water circulation filtering system, a water tank position adjusting mechanism, a marking machine, an electric control system and an upper computer. A multi-channel ultrasonic detection module and a low-frequency large-size ultrasonic probe are adopted, and a pulse echo technology and a dynamic parameter adjustment technology are combined, so that different wall thicknesses are adapted, and missing detection is avoided; by means of a position adjusting mechanism, a flexible water tank and a gate tracking technology, pipeline jumping and unevenness are compensated in a self-adaptive mode; a multi-factor coupling sound velocity calibration module is innovatively provided, the influence of high temperature, wall thickness and sand inclusion distribution on the sound velocity is corrected in real time, and the defect positioning precision is remarkably improved. The system has the functions of real-time imaging, defect alarm and statistics, and realizes efficient and accurate on-line detection of the internal defects of the pipeline.

The invention provides an interlayer slip quantification method based on pulse echo attenuation, and belongs to the technical field of ultrasonic nondestructive testing of multilayer heterostructures, and the method comprises the following steps: obtaining basic data of a structure to be tested, determining a central frequency range of an ultrasonic transducer, and constructing an ultrasonic interlayer slip quantitative detection system; performing ultrasonic excitation and signal acquisition on the to-be-detected structure, and preprocessing the acquired pulse echo signal; intercepting each echo packet of the pulse echo signal, and calculating logarithmic power of each echo packet after geometric correction; performing linear fitting on the logarithmic power, and extracting a slope of a fitting straight line as an effective attenuation slope of the to-be-measured structure; and substituting the effective attenuation slope into the constructed interlayer slip quantitative model, and determining a normalized contact area representing the interlayer slip degree of the to-be-measured structure. According to the invention, quantitative evaluation of the local interlayer slip state in the multilayer heterostructure can be realized without dismounting the structure, the spatial resolution capability is high, and the sensitivity is strong.

This invention proposes a method for monitoring early icing of aircraft based on ultrasonic pulse echo. The input parameters of this method include echo signals from ice-free structures, echo signals from iced structures, and the surface temperature of the structures. By analyzing and processing these input signals using the proposed method for early icing warning and ice thickness measurement based on ultrasonic pulse echo, early icing warning information and surface ice thickness data can be obtained, providing a basis for the activation and deactivation of the aircraft icing protection system. This invention can reduce the energy consumption of the aircraft icing protection system when removing ice from the aircraft surface, improving energy efficiency while ensuring flight safety, and has promising application prospects.

The application discloses a kind of laser guidance radar's anti high frequency interference method and device, method includes: receiving multiple echo signals and according to multiple echo signals real-time setting multiple self-adapting overlapping wave gates;Echo signal is the signal formed after reflection for the pulsed signal that laser target indicator emits in random frequency mode;According to multiple wave gates, obtain multiple candidate pulse echo combinations from multiple echo signals;According to each echo signal and the target distance of target to be hit, with the motion attribute of seeker for hitting target to be hit, obtain target pulse echo combination from multiple candidate pulse echo combinations;According to target pulse echo combination, determine the position of target to be hit.The application can improve the anti high frequency interference ability of laser guidance system, realize accurate laser guidance, and can be widely applied in laser guidance field.

The application discloses a kind of extremely narrow pulse radar target attitude insensitivity feature extraction and cross-attitude identification method, the method is first based on the automatic extraction of target category feature and attitude feature of depth network;Then successively the obtained feature is input into two modules of classification and decoupling, classification module is used to constrain the correctness of the above two types of features corresponding semantics respectively;Decoupling module is used to constrain the above two types of features semantics irrelevant, and no information loss occurs in the decorrelation process;Finally, based on category feature, target recognition is completed, the method of the application can be for the extremely narrow pulse echo sample under the attitude that does not appear in training set, with good recognition performance.

This invention discloses a low-noise amplifier based on an inverter and its multi-objective optimization method, including an inverter and an input capacitor C. I Feedback capacitor C F And a single-stage operational amplifier. An inverter consists of a PMOS transistor and an NMOS transistor connected in series, with an input capacitor C. I and feedback capacitor C F All amplifiers use a split capacitor structure. The positive input of the single-stage operational amplifier is connected to the output of the inverter, the negative input is connected to the reference voltage, and the output is connected to the gate of the NMOS transistor through resistor R2. At the same time, the gate of the PMOS transistor is connected to resistor R1, and the resistance values ​​of R1 and R2 are equal. This improves the stability and noise performance of the amplifier circuit. A multi-objective optimization design method is used to optimize the design parameters of the low-noise amplifier to meet the amplification requirements of ultrasonic pulse echo signals of different frequencies, thereby improving design efficiency.

The invention discloses a self-crawling detection robot and a cavity detection method thereof, and relates to the technical field of pipeline detection.The self-crawling detection robot comprises a rack, a walking device, an adsorption device, an odometer wheel and a cavity detection device.The cavity detection device comprises a marking structure and at least one bag type ultrasonic probe, and the marking structure is used for marking a detected cavity; the bag type ultrasonic probe is arranged on the second frame body, and the bag type ultrasonic probe faces a to-be-detected structure; the bag type ultrasonic probe comprises a sealing bag, a fixing shaft and an ultrasonic probe body. The self-crawling detection robot can carry out all-dimensional detection on the pipeline, in the detection process, all the bag type ultrasonic probes work independently, all-dimensional detection is carried out on the pipe wall through the ultrasonic detection technology and the pulse echo method, the problem of complex cavity detection in the ultra-large-diameter pipeline is solved, and manual detection can be completely replaced.

This invention relates to the field of non-destructive testing (NDT) technology in building engineering, specifically a method and system for NDT of internal defects in building structures. The method includes: simultaneously acquiring ultrasonic pulse echo, X-ray projection, and infrared thermography sequences of the target area; extracting signal features through time-frequency joint analysis; generating an internal three-dimensional density field through tomographic reconstruction and density inversion; identifying thermal resistance anomalies through transient thermal conduction analysis; fusing the above multi-physics field features and inputting them into a pre-trained deep network model to directly output the defect type, precise geometric parameters, and quantified hazard level; and automatically generating a spatial location map of the defect and a damage evolution trend prediction report based on these features. This invention achieves deep fusion and intelligent analysis of multi-source information, improves the accuracy of defect identification and quantitative assessment, and enables predictive assessment of defect development trends.

The invention discloses a microwave single-photon real-time imaging system and method based on flight time measurement, and belongs to the field of microwave optical imaging radars, and the system and method provided by the invention comprises the steps: carrying out the up-conversion conversion of a received microwave pulse echo signal to an optical domain, and carrying out the free space light processing; and performing target imaging on the signal after optical domain processing through the single-photon detection array. Large-view-field and high-real-time imaging of the target is achieved through the single-photon detection array, and compared with a traditional microwave optical imaging system, range profile information does not depend on the bandwidth of an emission signal, so that high-range profile resolution imaging of the target is achieved.

The invention belongs to the technical field of ocean in-situ detection, and particularly relates to an expandable underwater profile target laser radar detection system and method, and the system comprises a magnetic detection cabin and a load rejection cabin. The detection cabin comprises a detection cabin main body with a transparent whole body, a laser radar module is arranged in the detection cabin main body, the laser radar module comprises a pulse laser, a reflecting mirror, a right-angle reflecting mirror, a rotary reflecting mirror capable of rotating by 360 degrees, a telescope system, an optical filter and a photomultiplier tube, and a laser beam of the pulse laser is incident on the rotary reflecting mirror through the reflecting mirror and the right-angle reflecting mirror; light pulse echo signals reflected by the target penetrate through the detection cabin main body, are reflected by the rotary reflecting mirror, are received by the telescope system, and are detected by the photomultiplier through the optical filter; the rotary reflecting mirror, the right-angle reflecting mirror, the telescope system, the optical filter and the photomultiplier are coaxially arranged as an optical path, the optical path design blind area is small, and large-depth and large-range rapid underwater target profile detection is achieved in the system sinking process.

The invention relates to the technical field of concrete detection, and discloses a low-frequency ultrasonic imaging method and device, computer equipment and a storage medium. Ultrasonic pulse echo signals are collected through an array type transducer; carrying out filtering processing on the collected ultrasonic pulse echo signal; identifying the arrival time of a direct wave based on a crest difference mutation criterion, inverting the propagation velocity of a transverse wave, and generating a single-region scanning image in combination with a synthetic aperture focusing technology; and finally, performing normalization, binaryzation and communicated region decomposition and matching on a plurality of scanning images to realize automatic splicing and fusion of cross-measurement-region images so as to form a two-dimensional ultrasonic imaging graph covering a long-distance structure. The method can effectively inhibit noise interference, improve wave velocity inversion and defect identification precision, realize continuous and complete imaging of a long-distance concrete structure, and is suitable for internal defect detection of subsea tunnels and other projects.

Method of operating a radar according to a synthetic aperture imaging mode and a second operating mode using alternating polarizations and associated radar. The present invention relates to a method of operating a radar according to a first operating mode and at least one second operating mode, the first operating mode being a synthetic aperture radar imaging mode and each second operating mode being different from the first operating mode, the method comprising the implementation of several recurrences of a signal transmission / reception step, each Nth recurrence of said step comprising the following sub-steps: - generation of a sequence of consecutive pulses, each pulse of the sequence being associated with the first operating mode or at least one second operating mode, - transmission of the pulses in different frequency bands,The pulses associated with the first operating mode and at least one second operating mode are emitted using different polarizations, and the pulse echoes are received within a common time window. Figure for the abbreviation: Figure 4.

Method for operating a Doppler-mode detection radar and associated detection radar. The present invention relates to a method for operating a target detection radar using Doppler modes, the method comprising the implementation of several repetitions of a signal transmission / reception step (110), each Nth repetition of said step (110) comprising the following substeps: + generation (111) of two consecutive pulses associated with different Doppler modes; + transmission (112) of the pulses in different frequency bands; + reception (113) in a common time window of the pulse echoes. Figure for the abstract: Figure 4

Method of operating a radar according to a synthetic aperture imaging mode and a second operating mode using random phases and associated radar. The present invention relates to a method of operating a target detection radar according to a first operating mode and at least one second operating mode, the first operating mode being a synthetic aperture radar imaging mode and each second operating mode being different from the first operating mode, the method comprising the implementation of several recurrences of a signal transmission / reception step, each recurrence of said step comprising the following sub-steps: - generation of a sequence of consecutive pulses, each pulse of the sequence being associated with a respective operating mode, - transmission of the pulses in different frequency bands,and - reception within a common time window of pulse echoes, during the substep of the emission of each recurrence, at least one of the pulses, called the phase-shifted pulse, being emitted with a random phase associated with the number N. Figure for the abbreviation: figure 4,

This invention relates to a multi-mode radar composite detection method, belonging to the field of microwave-laser composite detection technology, and solves the problems of inability to achieve all-weather detection, low detection accuracy, and weak adaptability. The method includes: splitting a laser generated by a laser into multiple paths; modulating the first laser path to generate a microwave radar transmission signal and receiving the microwave radar echo signal; modulating the second laser path to generate an intermediate frequency (IF) echo signal; generating a single-photon laser pulse based on the third laser path and receiving the single-photon laser pulse echo signal; generating a laser transmission signal based on the fourth laser path, transmitting the laser transmission signal towards the target and receiving the laser echo signal; using the laser echo signal to coherently process the fifth laser path to obtain a coherent IF signal; and processing the IF echo signal, the laser pulse electrical signal, and the coherent IF signal respectively to obtain target characteristic parameters.