33 results about "Echo detection" patented technology

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.

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.

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 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 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 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 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.

The application discloses a kind of slope displacement monitoring method, equipment and medium based on quantum single photon, belong to displacement monitoring technical field.The application is by emitting rectangular light pulse according to cycle, utilizes single-photon detector to complete echo detection and constructs photon counting time sequence, carries out wavelet denoising and reconstruction processing to it, extracts main peak position shift, energy change and form distortion matches multi-class feature vector, then carries out feature fusion and solution by multi-source feature fusion BP neural network, finally outputs high-precision slope displacement result.The application combines quantum single-photon detection technology with wavelet denoising, neural network fusion algorithm, effectively suppresses noise interference, improves displacement feature extraction accuracy, and is suitable for high-precision, long-distance real-time monitoring of slope micro-deformation.

The application discloses a simulation processing method and device of a radar signal and electronic equipment. The method comprises the following steps: obtaining a radar echo signal generated by field programmable gate array in signal transceiving characteristic simulation of a radar signal; performing signal pulse compression processing on the radar echo signal to obtain a pulse modulation signal; performing multi-pulse cancellation and moving target detection processing on the pulse modulation signal to obtain a pulse matrix; performing constant false alarm rate detection on the pulse matrix in a thread synchronization mode to obtain an echo detection result; in the case that the echo detection result indicates that a radar detection target is detected, acquiring distance, speed and angle data of the radar detection target; and sending the distance, speed and angle data of the radar detection target to a central processor, so that the central processor determines track information of the radar detection target according to the distance, speed and angle data. The scheme provided in the application embodiment can improve the real-time performance of radar seeker simulation.

The invention discloses a self-echo cancellation method and system for a hearing aid, and the method comprises the following steps: transmitting a section of echo simulation audio through an echo detection module, converting all received audio signals into sound wave signals through a playing module, playing the sound wave signals, receiving the echo simulation audio through a receiving module, and transmitting the sound wave signals to a processing module. According to the method, the echo calculation module is used for calculating the fluctuation ratio of the received echo audio and the echo simulation audio, and the echo elimination module is used for recording the audio subjected to noise reduction processing. A group of analog signals identical to the audio signals are made according to the record, the ratio of the analog signals to the original audio is set according to the fluctuation ratio of the echo audio and the echo analog audio, then the analog signals are compared with the audio signals received by the rear end, and then the echo signals in the audio signals are eliminated. According to the method, the echo generated by the hearing aid can be accurately eliminated.

This invention relates to the field of laser detection and navigation positioning technology, and discloses a real-time noise reduction and in-situ calibration system and method for laser ranging sensors. The system includes an acquisition module, an extraction unit, a mapping unit, a control unit, and a compensation unit. The system extracts the zero-position calibration pulse generated by reflection within the optical window, calculates the waveform asymmetry parameter to construct a timing compensation operator for the receiving link, and the control unit adjusts the measurement echo detection threshold according to the pulse energy distribution parameter. The compensation unit uses the operator to correct the target echo phase centroid and uses the real-time phase center of the pulse as the timing start anchor point. This invention converts the ranging reference from static setting to dynamic physical reconstruction, and synchronously eliminates clock temperature drift and circuit delay deviation caused by ambient temperature rise during the ranging cycle, thereby eliminating the cumulative error caused by spatiotemporal reference drift in long-distance navigation.

This invention relates to the field of liquid level measurement technology, specifically providing an offline echo detection method for an ultrasonic liquid level measuring and control instrument. The method involves acquiring raw sampling data by continuously transmitting multiple ultrasonic pulses, calculating the historical maximum background noise value, and introducing a preset empirical threshold to generate a comprehensive background noise value. Based on temperature, the current sound velocity is calculated, and the echo search interval is dynamically adjusted. The comprehensive background noise value is used to extract the echo array, and a dual-echo comparison is performed to screen and determine valid echo points. An extreme value removal and averaging filter is applied to the instantaneous height value, and the maximum deviation of the remaining filtered data is compared with a preset dead zone distance. The comparison status is fed back to the noise calibration step to lock or update the comprehensive background noise value. This invention achieves synergistic effects through closed-loop feedback, improving the adaptive recovery capability and measurement accuracy in complex offline environments.

The application discloses a target echo detection method and system based on multi-domain reconstruction residual, equipment and medium, and the method comprises the steps of collecting sea clutter images and classifying, designing and training a double auto-encoder, training a multi-domain encoder based on the double auto-encoder on a sea clutter image dataset subjected to Fourier transform, ridge wave transform and contour wave transform, calculating the reconstruction residual of the sea clutter image in the multi-domain through the multi-domain encoder, obtaining an optimal expression during target echo detection through SVM supervised learning, and completing target detection based on the reconstruction residual and the optimal expression; the system, equipment and medium are used for realizing a target echo detection method based on multi-domain reconstruction residual; the application learns the current sea clutter structural features through the constructed double auto-encoder, and learns the feature difference between the target and the sea clutter through SVM supervised learning, and has the characteristics of high measurement accuracy and strong applicability.

The present application relates to a kind of impulse echo positioning cable detector, it includes: integral circuit array, each integral circuit unit of integral circuit array includes an integral capacitor;Switch array is used to select the single integral circuit unit in integral circuit array;Test control module is used to divide echo detection period into multiple time slices, and each time slice is associated with a specific integral circuit unit, then each integral circuit unit is selected in turn according to time sequence, and the echo signal of the same time slice of multiple rounds of echo detection period is introduced into the same integral circuit unit to accumulate;Sampling module is used to read out the signal value cached by each integral circuit unit, and the time sequence waveform of echo signal is recovered;And data processing module is used to determine the arrival time of echo pulse.The present application also provides a corresponding weak pulse signal detection method.The present application can detect extremely weak echo signal, so that transmission impedance uneven point can be detected in super long distance.

The application discloses a kind of multistatic active sonar detection methods, it is related to active sonar detection field, the multistatic active sonar detection method of the present application includes: step 1: transmitter S launches sound source information;Step 2: receiver R receives direct wave and target echo;Step 3: judge target T is located on the circumscribed ellipse with transmitter S and receiver R as focus;Compared with prior art, the beneficial effects of the present application are: the present application uses communication-detection composite waveform, the waveform parameters, sound source position and transmission time are encoded and modulated after being embedded in the detection waveform, and then sent out, the receiver obtains these information by demodulation decoding, restores the original transmission waveform for echo detection at the same time, and uses sound source space-time information to carry out target positioning calculation;It does not depend on external communication link to carry out sound source space-time information synchronization, so it has wide adaptability, and can fully utilize the sound pulses emitted by different horizontal sound sources in formation to carry out echo target detection.

The embodiment of the invention discloses an actuation state detection method for a power system execution mechanism, and the method comprises the steps: building a motion equation of the power system execution mechanism in a high-temperature and high-speed fluid environment, and building a reflection echo model in combination with a built high-frequency signal propagation loss estimation model in a free space and a metal pipeline; transmitting a high-frequency signal and receiving multiple beams of actual reflection echo signals; determining the center frequency of each beam of actual reflection echo signal through a frequency determination function of an established joint precision distance measurement algorithm; based on the center frequency, calculating through a reflection echo model to obtain a theoretical reflection echo signal; a true reflection echo signal is determined through an established true and false echo detection and separation algorithm; the distance between the detection system and the execution mechanism is determined based on the real reflection echo signal through the distance measurement function of a combined precise distance measurement algorithm; and determining the dynamic characteristics of the actuating mechanism through the motion equation, and determining the actuating state of the actuating mechanism based on the distance and the dynamic characteristics.

This invention discloses a method and system for reconstructing distorted logging curves in inter- and sub-salt formations based on intelligent algorithms, relating to the field of oil and gas logging data processing technology. The method includes: constructing a training dataset containing multi-scale physical disturbances; employing a phased training approach to form a hybrid reconstruction model; collecting echo detection signals from the target well section and performing hierarchical cascade analysis based on the hybrid reconstruction model to determine the reconstruction results; and displaying the reconstruction results on a terminal interface. This invention solves the technical problems of existing technologies, such as difficulty in fully covering complex salt rock interference scenarios in inter- and sub-salt formation logging curve reconstruction, insufficient accuracy of reconstruction results, and poor adaptability to geological patterns. It achieves accurate reconstruction and visualization of distorted logging curves in inter- and sub-salt formations affected by salt rock interference, improving the accuracy and geological adaptability of curve reconstruction.

The invention discloses a multi-echo high-dynamic radar signal processing method, system, equipment and product, and belongs to the technical field of echo signal processing. Laser radar echo signals are obtained, discontinuous events in the laser radar echo signals are suppressed based on a pre-constructed combined morphological filter, and the suppressed laser radar echo signals are obtained; performing multi-scale decomposition on the suppressed laser radar echo signal based on an empirical mode decomposition algorithm to obtain a decomposed echo signal; enhancing the decomposed echo signal by using a wavelet threshold method to obtain an enhanced echo signal; and classifying the enhanced echo signals based on a pre-constructed target echo detection model and an adaptive threshold mechanism to obtain single-target echo signals and multi-target echo signals. The method can improve the precision and processing efficiency, reduces the influence of noise and interference on echo signals, does not affect the decomposition efficiency in the detection process, and can improve the accuracy and efficiency of target detection and recognition.

This invention discloses a multi-echo detection method for a multi-beam echo sounding system with combined amplitude and phase features. The pre-detection step includes: segmenting the beam output signal; for each unit to be detected, obtaining an amplitude detection threshold using the unit average constant false alarm rate (CFAR) method based on background noise estimation from the reference units on the left and right sides; extracting the instantaneous phase from the signals of each receiving channel using Hilbert transform, and obtaining the phase coherence factor between each receiving channel from statistical characteristics; dynamically adjusting the amplitude detection threshold as an adaptive weight to construct a detection threshold for combined amplitude and phase features; initializing weighting coefficients based on echo intensity differences, and dynamically optimizing them in conjunction with the intensity value of the phase coherence factor to obtain an adaptive weighted amplitude and phase joint detection threshold; merging sampling points exceeding the adaptive weighted amplitude and phase joint detection threshold, removing interfering targets, and identifying and extracting multiple independent effective target intervals.

The invention provides a concrete quality impact echo detection device for water conservancy construction, and relates to the field of concrete quality detection.The concrete quality impact echo detection device comprises a pickup cylinder, an impact hammer arranged on the outer side of the pickup cylinder, a mounting seat arranged on the pickup cylinder and a synchronous adjusting mechanism arranged on the mounting seat; in order to solve the problems that in the prior art, the error is large and the accuracy of concrete defect judgment is affected due to the fact that knocking detection is conducted manually through an impact hammer, and the fault rate of a detection device is large and the detection efficiency is affected, the synchronous adjusting mechanism is arranged, so that the detection efficiency is improved, and the detection efficiency is improved. The impact hammer is driven by the synchronous adjusting mechanism to automatically perform single-point knocking, so that errors caused by manual detection are reduced, and the accuracy of data is improved; by arranging the synchronous adjusting mechanism, the problem that in the prior art, the accuracy is low due to the fact that the knocking speed is unstable is solved; and by arranging the synchronous adjusting mechanism, the problem that the detection quality is influenced by different knocking forces in the prior art is solved.

This invention relates to a method for inverting the initial ground distance of a target based on anomaly echoes from its exhaust plume, belonging to the field of high-speed maneuvering target detection technology. This invention addresses the challenges of detecting, locating, and accurately inverting the initial distance of high-speed targets under complex backgrounds. The steps of this invention include: S1: ionospheric model simplification; S2: extraction of Bragg peak offset; S3: Doppler spectral feature extraction; S4: establishment of joint anomaly indices; S5: adaptive threshold detection and centroid localization; S6: nonlinear deviation fitting to obtain the true ground distance value. This invention establishes a complete closed-loop link from anomaly echo detection to quantitative estimation of the target's initial ground distance. By combining physical modeling and data-driven approaches, it effectively eliminates systematic biases in distance inversion, providing high-precision prior distance information for trajectory analysis and state identification of high-speed maneuvering targets.

This application discloses a method for detecting the operating state of a power system actuator, comprising: establishing the motion equation of the power system actuator under high temperature and high speed fluid environment; establishing a reflected echo model by combining the established free space and high frequency signal propagation loss estimation model in metal pipes; transmitting a high frequency signal and receiving multiple actual reflected echo signals; determining the center frequency of each actual reflected echo signal by using the frequency determination function of the established joint precision ranging algorithm; calculating the theoretical reflected echo signal based on the center frequency by using the reflected echo model; determining the true reflected echo signal by using the established true and false echo detection and separation algorithm; determining the distance between the detection system and the actuator by using the ranging function of the joint precision ranging algorithm based on the true reflected echo signal; determining the dynamic characteristics of the actuator by using the motion equation; and determining the operating state of the actuator based on the distance and dynamic characteristics.

The utility model discloses a fetus-voice meter capable of automatically eliminating coupling agent smearing noise, which comprises an ultrasonic circuit used for transmitting pulses or continuous ultrasonic waves; the input end of the echo detection circuit is electrically connected with the output end of the ultrasonic circuit, and the echo detection circuit is used for detecting an ultrasonic signal reflected by the ultrasonic circuit; the corresponding output end of the main control circuit is electrically connected with the input end of the ultrasonic circuit, and the corresponding input end of the main control circuit is electrically connected with the output end of the echo detection circuit; and the input end of the sound playing circuit is electrically connected with the corresponding output end of the main control circuit.

The invention provides a method, a chip and a system for transmitting ultrasonic echo data by an ultrasonic sensor, and the method comprises the steps: extracting data points representing a signal interval in which an obstacle is detected from an ultrasonic echo detection signal, the data points comprising an upper crossing threshold point, a wave crest point higher than a threshold, a wave trough point higher than the threshold, and a lower crossing threshold point; the ultrasonic sensor chip encapsulates the data points into data frames and adds a serial number before a start data point and / or after an end data point of at least one data point packet to identify adjacent data point packets. The data processing unit can identify the grouping and the type of the data point according to the information of the serial number, so that the type information of a single data point does not need to be additionally transmitted, the communication bandwidth required by ultrasonic echo data transmission is reduced, and the data transmission efficiency is improved.

The invention discloses an underwater multispectral full-waveform laser radar robust ranging method and device and a medium. The method comprises the steps of S1, data acquisition; s2, waveform preprocessing; s3, constructing a target echo model; s4, target echo detection; s5, target echo feature extraction; and S6, peak value estimation and distance calculation. According to the method, robust time positioning and distance estimation under the conditions of interface echo peak top saturation clipping and peak back trailing right deviation are realized, systematic deviation introduced by peak point distortion and trailing superposition is inhibited, and the consistency and comparability of multi-wavelength distance measurement results are improved; and a new technical path and an application prospect are provided for accurate distance measurement of the underwater multispectral laser radar.

The application provides a sky wave radar island echo detection method, which removes radio frequency interference and noise in a range-Doppler power spectrum, detects Doppler frequency shift of a pair of Bragg peaks of first-order sea clutter in a sea surface echo range-Doppler power spectrum, extracts a column of data located in the middle of the Doppler frequency shift of the Bragg peaks in the sea surface echo range-Doppler power spectrum as island echo data of the detection frequency, and obtains swept island echo data after processing data of all detection frequencies. The method has good real-time performance, can effectively obtain swept island echo data, and the data can be used as input data for island positioning, thereby being applied to engineering practice.

A method of full-field or “ping-based” Doppler ultrasound imaging allows for detection of Doppler signals indicating moving reflectors at any point in an imaging field without the need to predefine range gates. In various embodiments, such whole-field Doppler imaging methods may include transmitting a Doppler ping from a transmit aperture, receiving echoes of the Doppler ping with one or more separate receive apertures, detecting Doppler signals and determining the speed of moving reflectors. In some embodiments, the system also provides the ability to determine the direction of motion by solving a set of simultaneous equations based on echo data received by multiple receive apertures.