96 results about "Echo detection" patented technology

The invention discloses a wharf armor block quality detection method, and belongs to the technical field of concrete structure detection.The method comprises the steps that a surface model is constructed through a movable three-dimensional laser scanning device, and a high-risk defect area is recognized; performing encryption scanning and impact echo detection in the high-risk area by adopting a frequency-adjustable dual-mode flaw detection device to generate a three-dimensional defect distribution diagram; a core sample is drilled in the defect area for compressive strength testing, and the material performance is analyzed in combination with a non-contact infrared spectrum; and establishing a dynamic evaluation model, calculating a safety coefficient by integrating surface defects, internal defects and material discreteness data, and generating a three-dimensional visual report. The problems that a traditional detection method is low in efficiency, insufficient in internal defect positioning precision, one-sided in material performance evaluation and the like are solved, full-dimensional detection from the surface to the interior and from the macroscopic level to the microscopic level is achieved through a multi-source data fusion and closed-loop feedback mechanism, and the reliability of structural safety evaluation and the scientificity of maintenance decision are remarkably improved.

The invention relates to the technical field of echo detection, in particular to an active sonar echo detection method, which comprises the steps of collecting active sonar reverberation data; constructing an active sonar channel, and generating reverberation data of a target echo; extracting target echo signal features by using matched filtering; a classification model of an improved SwinTransform is constructed, pooling, full connection and residual structures are constructed behind a Patch Merge layer of a hierarchical model of different stages, a transient target peak value in a reverberation background is highlighted, and time-frequency correlation characteristics of reverberation and a target are captured. According to the method, the problem that the accuracy of predicting whether a target exists or not by using sonar echoes through a Swin Transformer model needs to be further improved is solved.

The invention relates to the technical field of cable measurement, and discloses a cable length measurement method based on coupling inductance and TDC, and the method comprises the following steps: test pulse reset, channel sequential gating, threshold dynamic adjustment, TDC state configuration, channel stable waiting, test pulse generation, time difference precise capture, validity intelligent judgment and data sorting optimization. According to the cable length measurement method based on the coupling inductor and the TDC, the coupling inductor is adopted to replace an FPGA to generate narrow pulses, the TDC is adopted to replace a high-speed ADC, and the hardware cost is reduced by 60%-80%; by optimizing the pulse generation and echo detection circuit, the measurement blind area is reduced to 0.5 m, the short-distance cable measurement requirement is met, and the device has the advantage of being small in measurement blind area.

The invention belongs to the technical field of marine surveying and mapping, and discloses an airborne marine laser radar underwater weak echo signal detection method and system. According to the method, a waveform rising edge is determined by constructing a standard deviation curve, a water surface echo moment is accurately extracted, and two water surface geometric elements of a water surface point and a refraction vector are calculated on the basis; constructing a time-space constrained waveform superposition model, taking the Euclidean distance between the two water surface geometric elements as a neighbor discrimination standard, and screening and superposing neighbor waveforms by using a K neighbor judgment method to obtain a superposed pseudo waveform with a high signal-to-noise ratio; and finally, an improved normalized saliency peak detection method is utilized to judge the underwater echo position step by step and obtain the final underwater echo moment. After the model constructed by the invention is used for processing, the underwater weak echo detection of the airborne ocean laser radar is effectively realized, the maximum sounding performance of the airborne ocean laser radar is improved, and an effective technical support and a solution are provided for sounding data processing and application.

The invention discloses a current transformer oil level monitoring system based on ultrasonic echo detection, which relates to the technical field of electric power monitoring and comprises the following steps: acquiring original echo time sequence data; calculating the distance between the transmitting end and the top of the metal expander by combining the propagation velocity of the ultrasonic waves in the air; and when the oil level height value is lower than a set threshold value, an alarm signal is triggered. According to the invention, the problems of easy clamping stagnation, complex installation, large temperature drift and environmental interference and the like of the traditional float-type, pressure-type and window observation methods are effectively overcome, remote uploading and local acousto-optic prompt are supported, and intelligent inspection and fault pre-warning identification under unattended operation are realized; and the operation safety, the monitoring reliability and the operation and maintenance intelligent level of the oil-immersed current transformer are remarkably improved.

The embodiment of the invention provides a transducer echo line sequence test method and a transducer echo line sequence test device, and the method comprises the steps: enabling a detection surface and a horizontal plane to form a first angle in an echo detection state, comparing waveform data of feedback signals obtained by reflecting the ultrasonic signals emitted by the plurality of test array elements through the detection surface with preset qualified data to determine a performance result of the transducer; in the line sequence detection state, a second angle is formed between the detection surface and the horizontal plane, and the actual flight time difference value of each adjacent test array element in the plurality of test array elements is determined according to waveform data of feedback signals obtained by reflecting ultrasonic signals emitted by the plurality of test array elements through the detection surface, and according to a comparison relation between a difference value between the actual flight time difference value and the theoretical flight time difference value and a preset threshold value, whether welding of each test array element is correct or not is determined. Therefore, an echo performance detection function and a multi-array element line sequence detection function can be integrated.

The invention discloses a light protection device and method. The device comprises an optical splitter, an echo extraction module, an echo detection module and a control module, the optical splitter is connected with the echo extraction module, the echo extraction module is connected with the echo detection module, the echo detection module is connected with the control module, and the control module is connected with the optical splitter; the optical splitter is used for carrying out power distribution on main and standby lines in the optical fiber communication system according to the target splitting ratio; the echo extraction module is used for extracting echo signals of the main and standby lines; the echo detection module is used for performing signal detection processing on the echo signal to obtain a detection result; the control module is used for determining the abnormal state of the main and standby lines according to the detection result and adjusting and updating the target splitting ratio based on the abnormal state. The technical problems of poor timeliness and high energy loss of an optical fiber line protection method in related technologies are solved.

The invention discloses an LFM frequency hopping signal long-distance target echo detection method, terminal equipment and a storage medium, and the method comprises the steps: constructing the two-dimensional time-frequency features and one-dimensional matched filtering features of a target echo, extracting the two-dimensional time-frequency features through employing a CNN network, and extracting one-dimensional time sequence features through an SE-CNN-GRU network; carrying out weighted fusion on the multi-dimensional features through a self-adaptive weighted fusion module; a multi-head attention mechanism is introduced to enhance the fused features; and outputting a classification result through the full connection layer and the Softmax layer to obtain a detection result of the target echo. According to the method, one-dimensional matched filtering and a two-dimensional time-frequency graph are selected as input features of the artificial intelligence detection method, the advantages of different artificial intelligence networks are fully utilized to perform multi-dimensional feature mining, adaptive weighted fusion is performed through complementarity and correlation of the multi-dimensional features, and the fused features are further enhanced through an attention mechanism, so that the detection accuracy of the artificial intelligence detection method is improved. Therefore, the target echo detection capability is improved, and high detection accuracy and robustness can be realized in a low signal-to-noise ratio environment.

The invention discloses a side slope displacement monitoring method and device based on quantum single photons and a medium, and belongs to the technical field of displacement monitoring. Rectangular light pulses are emitted periodically, echo detection is completed by using a single photon detector, a photon counting time sequence is constructed, wavelet denoising and reconstruction processing is performed on the photon counting time sequence, main peak position offset, energy change and form distortion are extracted to match multiple types of feature vectors, and feature fusion and resolving are performed through a multi-source feature fusion BP neural network. And finally outputting a high-precision slope displacement result. According to the method, the quantum single-photon detection technology is combined with the wavelet denoising and neural network fusion algorithm, noise interference is effectively suppressed, the displacement feature extraction precision is improved, and the method is suitable for high-precision and long-distance slope micro-deformation real-time monitoring.

The invention relates to the technical field of audio processing, and discloses an echo detection and alignment method and device, computer equipment and a storage medium, and the method comprises the steps: obtaining a playing signal and a recording signal in real time, and carrying out the down-sampling of the playing signal and the recording signal, and obtaining a far-end signal and a near-end signal of a set frequency; based on the far-end signal and the near-end signal, a pre-constructed segmented normalized minimum mean square filter is adopted to carry out time domain adaptive detection matching echo time delay, and echo time delay offset is obtained; and carrying out statistics on the echo time delay offset by adopting a statistical histogram to obtain echo time delay, and carrying out time domain alignment on the playing signal and the recording signal based on the echo time delay. Whether the echo signal exists or not is detected with low complexity and high matching accuracy, the echo signal and the original signal are aligned in the time domain, the processing effect of the echo cancellation model in a high-delay scene can be remarkably improved, and the application scene of the echo cancellation model is increased.

The invention belongs to the technical field of radars, and particularly relates to an echo resolving method, an echo resolving engine, a laser radar and a medium, and the method comprises the steps: caching received echo data to a first buffer; detecting effective echo data meeting a preset rule in the echo data based on the first buffer; caching the effective echo data to a second buffer; and based on the second buffer, executing a preset algorithm to calculate and obtain a calculated value of the effective echo data. According to the invention, the effective echo is detected in the first buffer, the effective echo is solved in the second buffer, and the detection process and the operation process are strictly separated, so that some hardware depended by the operation which needs to be executed in the echo detection step originally can be saved. Compared with the echo data, the data after the resolving process is executed based on the second buffer is smaller in occupied space and higher in information density, so that the space required by subsequent storage can be compressed, and the problem that the overhead of storage resources is large is effectively relieved.

The invention discloses a radar detection imaging method, which comprises the following steps: firstly, calculating the electromagnetic field intensity of a radar signal of a radar to a target point after being transmitted and propagated through an evaporation waveguide medium by using an electromagnetic propagation model; utilizing an electromagnetic scattering model to calculate a radar signal backward far region scattering field of the target and the random sea surface composite scene, namely electromagnetic scattering characteristics; and finally, electromagnetic imaging is carried out on the radar signal backward far region scattered field by using an electromagnetic imaging algorithm. The evaporation waveguide serves as a transmission medium of radar electromagnetic waves, the detection capacity of the radar can be remarkably improved, beyond-visual-range detection can be achieved, meanwhile, compared with free space transmission, the enhancement effect of the evaporation waveguide layer on target electromagnetic signal echoes can improve the detection signal-to-noise ratio of signals, and the detection precision is improved. The method can be applied to a high frequency band to provide a high radar resolution, radar electromagnetic waves are propagated in the evaporation waveguide at a low glancing angle, sea clutter interference in the target echo detection process is reduced, and the precision and reliability of target detection are improved.

Systems and methods are provided for subway personnel detection. An ultra-wideband (UWB) based detection of objects in subway tunnels may include transmitting UWB signals into an area within a subway tunnel, the area including one or more tracks traversed by trains running in the subway tunnel, receiving UWB signals within the area, and processing received UWB signals to enable detecting objects within the area. The processing may include identifying received UWB signals corresponding to echoes of the transmitted UWB signal transmitted by the detection devices, and detecting based on the echoes of the transmitted UWB signals when an object is present within the area. The object may be assessed, such as to determine when the object represents an intrusion within the area of the subway tunnel.

The utility model relates to the technical field of transducers, and discloses an ultrasonic echo detection circuit, comprising a common-mode module which is connected to a first echo input end and a second echo input end, receives a first input signal and a second input signal, and is used for carrying out common-mode processing on the first input signal and the second input signal and sending the processed signal to a processor; obtaining and outputting a first direct-current signal and a second direct-current signal; the amplification module is connected with the common-mode module, receives the first direct-current signal and the second direct-current signal, amplifies the first direct-current signal and the second direct-current signal respectively, and outputs the amplified first direct-current signal and the amplified second direct-current signal; and the filtering module is respectively connected with the amplification module and the echo output end, receives the amplified first direct current signal and the amplified second direct current signal, filters common-mode signals for the amplified first direct current signal and the amplified second direct current signal to obtain a differential signal, and outputs the differential signal to the echo output end. The problems that detected ultrasonic echo signals are large in signal noise and low in integrity are solved.

This invention discloses a clutter discrimination and suppression method based on multiple echo features, comprising: acquiring radar front-end clutter and target echo detection video data and dividing it into several connected regions; extracting multi-dimensional features and labeling prior information for each connected region; using the Relief feature selection algorithm to calculate and filter the weights of the multi-dimensional features, removing redundant features to obtain the optimal feature vector; using this feature vector to train a support vector machine classifier, and obtaining the optimal parameter model through cross-validation; acquiring measured clutter data, extracting corresponding features and inputting them into the model; and determining whether to remove clutter and retain targets based on the output. This invention effectively filters out dynamic clutter spots, avoids false deletion of weak targets, significantly reduces the false alarm rate of the system, and alleviates the computational burden of subsequent track processing.

The application discloses a kind of fast detection SMT patch quality device and method, including conveying line, and the top side of conveying line rear end is provided with sorting mechanism, and the outer wall on the top side of conveying line is welded with stand, and drive mechanism is arranged on the stand, and drive mechanism is installed with echo detector above conveying line, drive mechanism includes the rotating shaft installed on stand, and one end of rotating shaft is fixedly installed with crankshaft, and the end away from rotating shaft of crankshaft is fixedly provided with bearing seat, bearing seat is inserted with transmission rod in its inside, and one end of transmission rod is welded with fixed plate.The application mainly generates multidimensional echo signal by echo detector, the form of SMT patch on conveying line is shot by echo detector and transmitted to controller, and displayed on display, while it can be compared with reference picture or data input in storage module, SMT patch exceeding specified range will be marked, greatly shorten the inspection time and improve the inspection qualified rate of product.

This application belongs to the field of speech processing technology and discloses a method, apparatus, electronic device, and computer-readable storage medium for echo detection. The method includes: acquiring a first speech sent to a target device; acquiring a second speech responded by the target device based on the first speech; determining the similarity between the first speech and the second speech; and obtaining an echo detection result based on the similarity. This allows for accurate detection of speech echoes, thereby avoiding voice interaction errors caused by echoes.

This invention achieves detection of non-cooperative aerial targets such as low, small, and slow aircraft by adding echo detection capabilities for the 1030MHz C / S mode interrogation signal and the 1090MHz C / S / ES mode reply signal. It also eliminates false ADS-B targets by integrating and judging the track information of non-cooperative targets, ADS-B track information, and TCAS track information. The solution uses software-defined radio technology to implement signal coding and modulation, frequency sorting, and signal analysis, achieving an integrated detection and identification design without significantly increasing the size, weight, or power consumption of existing hardware. This not only integrates and shares hardware resources, improving hardware utilization, but also allows for deep complementarity and fusion of detection and communication information, enabling efficient information exchange and significantly improving the system's cost-effectiveness. It also addresses the detection and identification of non-cooperative targets such as low, small, and slow aircraft and false ADS-B targets.

The invention discloses an underwater pile foundation cleaning and detecting integrated device and a pile climbing robot, the integrated device comprises a frame unit, a cleaning unit and a detecting unit, the bottom of the frame unit is fixed to the top of the pile climbing robot, the middle of the frame unit is provided with a connecting part, and the connecting part is arranged outside a pile foundation in a sleeving mode; the cleaning unit comprises at least one chemical reagent spray-washing assembly and at least one boiling water flushing assembly, and the chemical reagent spray-washing assembly and the boiling water flushing assembly are arranged at the top of the frame unit; the detection unit comprises at least one camera detection assembly and at least one impact echo detection assembly, and the camera detection assembly and the impact echo detection assembly are arranged on the top of the frame unit. The technical problems that in the prior art, the function is single, the adaptability is poor, the integration degree is low, the cleaning effect is poor, and the detection precision is insufficient are solved.

The application belongs to the technical field of ultrasonic signal processing, and particularly relates to a dual-task deep learning model, an ultrasonic echo signal recognition and positioning method and a system, wherein the ultrasonic echo signal recognition and positioning method comprises obtaining a one-dimensional time sequence signal, inputting the one-dimensional time sequence signal into a trained dual-task deep learning model, and obtaining an echo detection result and a position prediction result. The application couples two tasks of 'classification of existence of echo' and 'positioning of position of echo' in a unified end-to-end model for joint optimization through construction of an innovative dual-task deep learning model architecture, a shared feature extraction backbone enables the model to learn powerful feature representations common to both tasks, the correlation information between tasks is utilized, and the performance is promoted and improved in cooperation, thereby improving the efficiency, so that higher comprehensive performance is obtained than that of processing the two tasks separately.

The application discloses a satellite shell part with low radar echo scattering, and belongs to the technical field of on-orbit stealth of aerospace vehicles, which comprises a shell framework and a skin arranged outside the shell framework, the skin is made of composite radar stealth material, the shell framework is made of resin material, the composite radar stealth material comprises two photonic crystal thin films and a nano zinc oxide material coating, and the satellite shell part has a goose egg-shaped appearance. The satellite shell part with low radar echo scattering adopts the above structure, the goose egg-shaped appearance design can make the radar echo reflection angle larger, so that the radar echo detection is less, and the stealth effect is remarkable; through the combination of the composite radar stealth material coating and the goose egg-shaped shell, excellent radar echo weakening effect under the comprehensive action can be realized, and the radar stealth effect covering X wave band and below can be further realized.

The invention provides an ultrasonic distance measuring method, a chip, an ultrasonic distance measuring device and electronic equipment. The ultrasonic ranging method comprises the following steps: driving an ultrasonic transducer to transmit an ultrasonic signal; acquiring an analog input signal determined by superposition of the echo signal and the aftershock signal received by the ultrasonic transducer; in the process of carrying out echo detection on the analog input signal, carrying out at least one analog gain switching on a first analog gain for carrying out analog amplification processing on the analog input signal at present so as to continue to carry out analog amplification processing on the analog input signal; and carrying out analog-to-digital conversion on the analog input signal after analog amplification processing to obtain a digital input signal, and carrying out distance measurement according to the obtained digital input signal. According to the ultrasonic distance measurement method, the dynamic range of the signal chain of ultrasonic distance measurement is enlarged, and the near-field blind area of ultrasonic distance measurement caused by aftershock attenuation of the ultrasonic transducer is avoided.

Embodiments of the present application provide an echo signal detection method, a chip and an apparatus of an ultrasonic sensor. The method comprises periodically reading a first point signal and a second point signal of an echo signal according to a preset reading frequency, the first point signal serving as a reference signal and the second point signal serving as a comparison signal; determining whether the reference signal and the comparison signal are target signals based on amplitude information of the reference signal and the comparison signal; when the reference signal and the comparison signal are the target signals, updating the preset reading frequency to a first frequency and updating a quantity of the target signals; when the reference signal and the comparison signal are not the target signals, updating the preset reading frequency to a second frequency and restoring or maintaining the quantity of the target signals to an initial value; the first frequency is not less than the second frequency; and determining whether a target echo signal appears based on whether the quantity of the target signals is greater than a preset value. The efficiency of echo detection is improved.

The present invention discloses an optical fiber ultrasonic detection device, comprising an optical signal generating component, a transmitting optical fiber, and a plurality of photoacoustic transducer transmitters connected in sequence, an echo detection component, a transmitting optical fiber, and a plurality of photoacoustic transducer receivers connected in sequence; a front-end substrate; the transmitting ports of each photoacoustic transducer transmitter and the receiving ports of each photoacoustic transducer receiver are distributed on the same surface of the front-end substrate; the optical signal generating component comprises a laser generating device and a phased array unit for generating an excitation light signal; the phased array unit is used to control the laser generating device to transmit the excitation light signal to each photoacoustic transducer transmitter according to a set rule. The present application sets a plurality of photoacoustic transducer transmitters and photoacoustic transducer receivers on the front-end substrate, and the front-end substrate can be attached to the surface of human tissue to achieve non-invasive detection of human tissue; improves the accuracy and reliability of the ultrasonic detection structure, and reduces the operational difficulty of ultrasonic detection, which is conducive to the widespread application of ultrasonic detection.

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 is suitable for the technical field of radars, and provides a de-noising method and device of a laser radar, terminal equipment and a storage medium, and the method comprises the steps: employing a first threshold voltage to detect a first echo reflected by a detection region corresponding to the laser radar when sunlight noise exists in a current detection environment; when the sunlight noise does not exist in the current detection environment, a second threshold voltage is adopted to detect the first echo, and the second threshold voltage is smaller than the first threshold voltage. Therefore, the high threshold voltage is adopted to detect the echo when the sunlight noise exists so as to filter the sunlight noise, and the low threshold voltage is adopted to detect the echo when the sunlight noise does not exist so as to ensure the echo detection accuracy when the sunlight noise does not exist, so that the sunlight noise is removed, and the reliability of the point cloud data is improved; and the sunlight noise is directly removed in the echo signal extraction stage, and subsequent processing on the point cloud data is not needed, so that the calculation complexity is low, and the calculation resources of a chip are saved.

The application provides a method and system for visual monitoring of emergency conference system equipment operation, audio signals at multiple positions in a target conference room are collected; a mixed signal formed by the audio signals is retrieved, the mixed signal is separated into multiple audio channels to form a matrix; a buffer area is set for each audio channel; the order of audio data input and output is controlled, left and right channel audio data of each channel is stored in a corresponding slave buffer area, and the slave buffer area is recalled to a master buffer area; volume size analysis, echo detection, howling detection and bottom noise detection are performed on audio data of the master buffer area; and audio quality abnormal conditions are recorded and displayed. The application realizes detection of the running state of an audio processor and a public address system, facilitates monitoring of the running state of equipment by operation and maintenance personnel, and improves operation and maintenance efficiency.

The application provides an obstacle detection method, a vehicle-mounted device and a vehicle. The method comprises the following steps: controlling a vehicle-mounted radar to alternately perform a first type of detection and a second type of detection in a time division multiplexing manner, wherein the first type of detection and the second type of detection are respectively used for detecting the height of an obstacle around the vehicle, and the height of the obstacle comprises a positive value and a negative value; when the second type of detection is performed, switching the working parameter of the vehicle-mounted radar from a first parameter set used in the first type of detection to a second parameter set optimized for a ground echo, and performing ground echo detection by using the second parameter set; and judging whether the height of the obstacle around the vehicle is a negative value according to a received echo signal of the second type of detection, and outputting a detection result. The method provided by the application provides more comprehensive environmental perception capability for automatic parking and low-speed driving of the vehicle.

The present application relates to the technical field of underwater acoustic signal processing, and particularly relates to a method for detecting underwater target echo in a strong reverberation background, comprising the following steps: performing band-pass filtering on received sonar echo signals to obtain filtered signals; performing sliding window segmentation on the filtered signals to form a plurality of short-time signal segments; extracting the envelope of the short-time signal segments and performing normalization processing on the envelope; performing differential processing on the normalized envelope to obtain a differential envelope signal; performing frequency spectrum transformation and frequency weighting processing on the differential envelope signal to obtain a weighted envelope spectrum; performing feature extraction on the weighted envelope spectrum, calculating the spectral entropy and spectral variance, and constructing a spectral variance-entropy ratio; and determining whether a target echo exists. The method can reduce the false alarm rate while maintaining a high detection probability, and avoids the performance degradation of existing matched filtering methods in a strong reverberation condition.

A laser radar, a control method thereof, and an addressing circuit. The control method of the laser radar includes: obtaining the starting detection unit group address corresponding to the activated transmitting unit group in the laser radar, generating a corresponding detection control signal, wherein the starting detection unit group address is determined based on the calibration processing result; decoding and performing logical operation on the detection control signal to determine the address of the corresponding calibrated starting detection unit group, as well as the addresses of other detection unit groups that need to be activated synchronously with the starting detection unit group, obtaining a gating address, and generating a corresponding gating control signal; based on the gating control signal, activating the corresponding detection unit group to convert the echo light beam into a photoelectric signal. The above scheme improves the echo detection accuracy of the laser radar and effectively ensures data integrity.