9 results about "Pulse echo" patented technology

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.

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.

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.

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.

Method of operating a two-submode Doppler detection radar and associated detection radar. The present invention relates to a method of operating a radar comprising a signal transmission / reception step (110) comprising the following substeps: + generation (111) of two consecutive pulses associated with a first and a second Doppler submode; + transmission (112) of the pulses in different frequency bands; + reception (113) in a common time window of the pulse echoes; + preprocessing (114) of the received echoes in relation to the first Doppler submode to determine a clutter zone; + preprocessing (115) of the received echoes in relation to the second Doppler submode outside the clutter zone; the process further comprising the following step: - implementation (120) of an extraction processing from a preprocessing result of the echoes received in relation to the second Doppler sub-mode.Figure for the abbreviation: Figure 2.

This invention relates to a radar detection system with adaptive adjustment of operating modes, belonging to the field of radar detection technology. It solves the problem of low detection performance in existing radar systems due to limited detection performance at different distances and the inability to fully utilize the advantages of various radar types. The system includes: a microwave radar module, which receives a first laser and a second laser emitted from a beam splitter; modulates the first laser to generate a microwave radar transmission signal and transmits it to the target; modulates the second laser and transmits it to a feature generation module and a control module; a single-photon lidar module, which receives a third laser, generates a single-photon laser pulse and transmits it; receives the single-photon laser pulse echo signal and transmits it to the feature generation module and the control module; the feature generation module processes the intermediate frequency echo signal and the single-photon lidar signal to generate feature parameters of the target; and controls the operation of the microwave radar module and the single-photon lidar module based on the signal-to-noise ratio and range data.

The application discloses an ultrasonic online detection system for continuously winding glass steel pipes, and belongs to the technical field of pipeline nondestructive detection. The system integrates a multichannel 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. By adopting the multichannel ultrasonic detection module and the low-frequency large-size ultrasonic probe, combining the pulse echo technology and the dynamic parameter adjusting technology, the system is adapted to different wall thicknesses and avoids missing detection. The position adjusting mechanism, the flexible water tank and the gate tracking technology are used to adaptively compensate for the pipeline jumping and unevenness. The multi-factor coupled sound velocity calibration module is innovatively proposed to real-time correct the influence of high temperature, wall thickness and sand distribution on the sound velocity, and significantly improve the defect positioning accuracy. The system has real-time imaging, defect alarm and statistical functions, and realizes efficient and accurate online detection of internal defects of the pipeline.

A system (100) for localization of an anatomical part in a subject comprises: an array of ultrasound transducers (110); a control unit (120) configured to activate a selected subset of at least one ultrasound transducer (110) for controlling the subset to assume a localization mode, wherein the at least one ultrasound transducer (110) is configured to transmit pulse(s) of ultrasound signals and detect the reflected pulse(s) for forming pulse echo data representing an ultrasound response for each pulse as a function of a time delay, wherein the control unit (120) is further configured to sequentially activate different selected subsets; a processing unit (130) configured to analyze the pulse echo data in relation to a characteristic pattern, and to identify one or more ultrasound transducers (110) being located to acquire pulse echo data representing the anatomical part for determining a location of the anatomical part in the subject.