898results about "Wave based measurement systems" patented technology

An exemplary embodiment of the invention relates to a radar system comprising a radar transmission unit (200), a radar reception unit (300), and a central unit (100) which is optically connected to the radar transmission unit (200) and the radar reception unit (300), wherein at least one of said units comprises a signal separator (500) configured to separate a first signal from a second signal, said first and second signal being comprised in a respective optical carrier signal that said at least one unit receives, the signal separator (500) outputting the first signal at a first electrical output port (P1) and the second signal at a second electrical output port (P2), wherein the signal separator (500) comprises a photodetector (510) configured to receive the respective optical carrier signal and generate a photocurrent (Ip), and wherein the signal separator (500) is configured to extract both the first signal and the second signal from said same photocurrent (Ip) in the electrical domain.

A semiconductor laser chip (1) comprising a semiconductor body with a sequence of semiconductor layers (2) having an active region (20) for generating radiation is specified, wherein the semiconductor body has a resonator region (3) with the active region (20) and a diode region (4) spaced apart from the resonator region (3), wherein the active region (20) of the resonator region (3) and the diode region (4) are connected antiparallel to each other with respect to their forward direction. Furthermore, a semiconductor laser arrangement (10) with a semiconductor laser chip (1) is specified.

A laser drive circuit comprising: a high supply node for supplying a relatively high voltage; a low supply node for supplying a relatively low voltage; first and second laser drive outputs for connection across a laser to provide a drive current to the laser; a high-side switch coupled between the high supply node and the first laser drive output; and a low-side switch coupled between the low supply node and the second laser drive output; wherein the high-side switch is controlled to regulate the drive current supplied to the laser and the low-side switch is controlled to alternate its state between on and off states so as to pulse the operation of the laser.

The application discloses a container posture alignment detection method and system based on a laser radar, relates to the technical field of alignment detection, and comprises the following steps: a 3D Gaussian template of a container is established, a unified coordinate system is constructed, laser radar point cloud data is adaptively collected, and non-ground point cloud is obtained by ground segmentation; container candidate clusters are generated based on non-ground point cloud clustering, a unique target is selected according to structural consistency, target point cloud is obtained, and three-dimensional center estimation of the target point cloud is carried out by double-plane voting; the template center is used to align the three-dimensional center of the target point cloud, the point cloud is projected to a ground constraint plane and the direction distribution is calculated, a linear mapping matrix is constructed, rotation initial values satisfying orthogonality and environmental constraints are extracted by polar decomposition, and an initial posture is obtained; and high-precision, high-reliability and full-automatic container posture alignment is achieved in a complex, dynamic and unstructured port scene.

The present application provides an ultrasonic diagnostic apparatus, a control method of an ultrasonic diagnostic apparatus, a recording medium, and a computer program product. The present application is directed to accepting designation of a two-dimensional position on an ultrasonic image and being able to control the ultrasonic diagnostic apparatus in accordance with the designated position. A display section (118) accepts designation of a point on a displayed ultrasonic image through a touch operation or the like. A position information conversion section (130) converts coordinates of the point shown in a coordinate system of the ultrasonic image into coordinates in a coordinate system used by the ultrasonic diagnostic apparatus (100) in ultrasonic beam scanning. A central control section (120) and a control position setting section (132) use the coordinates obtained through the coordinate conversion to perform control of the ultrasonic diagnostic apparatus (100) (e.g., setting of a ROI).

The present application belongs to the technical field of radar signal processing and target identification, and particularly relates to a method and device for dual-band radar cross-frequency feature learning target identification, step 1, dual-band HRRP data is acquired and preprocessed and dataset is divided to obtain a training set and a validation set; step 2, a cross-frequency feature learning CFFL network is constructed, including a hand-crafted feature encoding HFE module, a deep difference representation DDR module, a feature fusion FF module and a classifier; step 3, a difference search attention mechanism and a difference search loss function are introduced into the DDR module to enhance the discriminative difference between the dual bands, and a loss function is constructed in combination with a cross-entropy classification loss to perform joint optimization; step 4, the dual-band HRRP training set and validation set samples are input into the constructed cross-frequency feature learning network, and end-to-end training is performed by using the loss function constructed in step 3; step 5, the trained CFFL network is used for target classification and identification.

The application discloses a kind of plasma sheath covering target fast time-frequency feature extraction method, belong to data processing technical field.The method includes: obtaining the linear frequency modulation narrowband echo signal of plasma sheath covering target, and the intra-pulse short-time Fourier transform is carried out to the echo signal, the time-frequency distribution of target is obtained;Radon transform is carried out to the time-frequency distribution, and the transformed domain distribution is obtained;Determine the straight line slope angle based on the peak position in transformed domain distribution;The straight line slope angle is the angle of x axis positive direction to straight line L normal vector;Based on the projection of the time-frequency distribution respectively on straight line slope angle and 90°, the frequency modulation period characteristic and width characteristic of plasma sheath are obtained.The application can effectively solve the extraction problem of plasma sheath instantaneous characteristic.

A holding bracket (170) adapted to retain a radar transceiver (130) that comprises an antenna arrangement (131) having an antenna aperture plane (132) that has a vertical extension (V) and a horizontal extension (H). The holding bracket (170) is divided into an upper part (170A) and a lower part (170B), where the lower part is adapted to be positioned closer the ground (G) than the upper part (170A). The lower part (170B) comprises a microwave energy absorbing part (180) that is adapted to prevent reflected microwave energy (R2) from radiating towards the ground (G), the microwave energy absorbing part (180) comprising a bottom end (181) that is positioned farthest from the upper part (170A), and a top end (182) that is positioned closest to the upper part (170A). The microwave energy absorbing part (180) is adapted to extend between the bottom end (181) and the top end (182) mainly parallel to the vertical extension (V) of the antenna aperture plane (132) when the radar transceiver (130) is mounted.

The present application provides a sensor capable of high-precision measurement with high SN ratio even when the ambient temperature changes, and a bandpass filter for the sensor. The sensor has a light source, a bandpass filter that extracts light of a peak wavelength of the light source, and a light-receiving element that receives the light extracted by the bandpass filter. The bandpass filter has a bandpass layer and a support that supports the bandpass layer. When the thermal expansion coefficient of the bandpass layer is α1, the elastic modulus is E1, the thermal expansion coefficient of the support is α2, and the elastic modulus is E2, α1 > α2 and E1 < E2 are satisfied.

The application discloses a high-sensitivity target detection method and system based on a microwave optical receiver, which is improved and integrated and optimized for the detection requirement of low-speed weak targets, introduces an optical injection locking local oscillator technology in a millimeter wave frequency band, generates a low-phase-noise and high-stability optical local oscillator signal for heterodyne down-conversion, and significantly improves the frequency stability and detection sensitivity of the system; a focal plane is also introduced to adopt a surface array detector for large-space-beam receiving, and a multi-pulse accumulation trajectory tracking algorithm is adopted in a signal processing module to realize long-time accumulation detection of weak target echo signals, effectively extract low signal-to-noise ratio target signals, and suppress clutter and single-frequency interference, and the system is endowed with high-precision and high-sensitivity detection capability for multiple targets.

A configurable phased array tile is disclosed including an aperture assembly having a plurality of aperture assembly connectors, a backplane assembly having a plurality of backplane assembly connectors, and a plurality of vertical transmit cards mounted to a corresponding first plurality of aperture assembly connectors and a corresponding first plurality of backplane assembly connectors. The plurality of vertical transmit cards each include a plurality of transmit channels including at least one high power transmit amplifier for powering at least one radiating element mounted to the aperture assembly.

The application discloses a signal interference strategy generation method and device based on deep learning, and a medium, and relates to the technical field of signal interference. The method comprises the following steps: calculating initial path rain attenuation values corresponding to reference level sampling data and real-time level sampling data; filtering a wet antenna attenuation component of the real-time level sampling data through digital filtering based on the initial path rain attenuation values, and determining pure path rain attenuation values of each communication link; inverting the pure path rain attenuation values to obtain path average rain intensities corresponding to each communication link; performing spatial interpolation optimization on a preset interference area to determine a two-dimensional rainfall intensity distribution map; calculating signal propagation time delay of an interference target ray track to obtain interference target corrected coordinates; and determining an interference strategy corresponding to the interference target through link interference parameter calculation and interference window prediction. The application solves the technical problem that the signal interference strategy in the prior art cannot meet the dynamic requirements of an interference signal link in a rainfall environment.

The application provides a single-point near-field joint positioning and velocity estimation method based on a super-large array, and relates to the technical field of wireless communication. The method comprises the following steps: dividing a transmitting array and a receiving array of an XL-MIMO system of a perception node respectively, and obtaining a plurality of transmitting-receiving subarray pairs; in a perception beam scanning mode, processing a received signal of a target reflection by using a segmented far-field model to obtain a processed received signal, the target being located in a far field of each transmitting-receiving subarray, and the target being located in a near field of the transmitting array and the receiving array; obtaining a spatial characteristic vector and a time characteristic vector of the target according to the processed received signal; obtaining position information of the target based on a spatial sparse representation model and the spatial characteristic vector; and obtaining velocity information of the target based on a velocity sparse representation model, the time characteristic vector and the position information of the target. The scheme of the application significantly reduces the position and velocity estimation complexity of a near-field target.

Techniques pertaining to data allocation for joint data communication and sensing in mobile communications are described. An apparatus (e.g., a user equipment (UE) ) generates a plurality of orthogonal frequency-division multiplexing (OFDM) symbols carrying data. The apparatus then transmits the plurality of OFDM symbols to: (a) communicate the data; and (b) perform mono-static sensing based on the plurality of OFDM symbols. A constraint is applied to at least one OFDM symbol of the plurality of OFDM symbols.

The application discloses a wide and narrow integrated low sidelobe multi-mode beam control system and method, and solves the problems of high beam control time delay requirement and limited storage space of an existing space-based radar. The architecture is composed of a hierarchical wave position control system, a multi-component joint control system and a ping-pong storage and pre-switching system. The hierarchical control realizes efficient cooperation from scheduling to execution. The multi-component joint control adopts a three-stage time delay architecture of "large time delay-small time delay-phase shifter", and accurately compensates the aperture effect of wideband and narrowband signals. The ping-pong storage and pre-switching system compresses and stores massive wave control codes through a two-stage storage architecture of FLASH and BRAM, and performs pre-switching through ping-pong operation. The application significantly improves the real-time performance, flexibility and storage efficiency of the wave control system, and can effectively support the application of high-precision, large-range and multi-mode space-based radars.

Example embodiments of the present disclosure relate to a life cycle management for sensing. An example method includes: receiving, by a terminal device, a configuration of a sensing type or at least one sensing functionality for a sensing feature; and performing a sensing or communication operation based on the configuration of the sensing type or the at least one sensing functionality. In this way, an air interface procedure for implementing a sensing functional framework is designed.

The spatial resolution of the virtual array antenna and the accuracy of the virtual array antenna's target direction estimation are adjusted according to the purpose. [Solution] The antenna device according to the embodiment comprises a reference signal generation unit, a first module, a second module, and a phase value generation unit. The phase value generation unit generates a first phase value based on the phase difference of the received signals in at least two virtual antennas, which are formed based on the received signals received by at least a portion of the first receiving antenna and the second receiving antenna when the first transmitting antenna transmits a transmission signal based on the first reference signal. The first transmission processing circuit shifts the phase of the second reference signal, which is transmitted by the second transmitting antenna after the first transmitting antenna, by the first phase value.

In summary, the present invention relates to the synchronization of sensor data, as can be used, for example, to test downstream processing of the sensor data. Three operating modes are provided for this purpose. In one operating mode, real sensor data is received from an environmental sensor and forwarded for subsequent processing according to the timing with which the sensor data is provided. In another operating mode, previously stored sensor data is forwarded according to the timing with which the sensor data is provided. Furthermore, a third operating mode is provided in which previously stored sensor data is forwarded with a timing that corresponds to the timing of other data simultaneously provided by an environmental sensor.

This invention relates to the field of radar target detection technology, and provides a robust method and apparatus for radar extended target detection under weighted generalized inverse Gaussian clutter. The invention uses a clutter prior information vector and a moment estimation order vector to estimate the clutter parameter vector; based on the training sample matrix, the data matrix to be detected, and the estimated values ​​of the clutter parameter vector, it estimates the inverse expectation of the texture component; based on the training sample matrix, the data matrix to be detected, the signal steering vector, and the estimated values ​​of the inverse expectation of the texture component, it constructs a test statistic; and based on the test statistic, it determines the target state. This invention solves the problems of radar extended target detection failing to meet real-time processing requirements and exhibiting poor robustness.

The application relates to a single photon avalanche diode front-end circuit for multi-mode detection, which integrates a quenching, delay control and self-resetting module composed of basic MOS tubes, inverters and logic gates. Three control signals are output by a controller to configure modes: in a synchronous gating mode, the related MOS tubes are sequentially controlled to be turned on and turned off in a gating mode; in an asynchronous free-running mode, the related control levels are fixed, and the reset delay is linearly controlled by adjusting the third control signal. The application realizes dual-mode detection by using a single circuit structure, shares the core quenching path, has the advantages of small area, low power consumption and wide adjustable range of dead time, and is suitable for large-scale SPAD array integration.

Device for controlling at least one light-emitting diode (LED1) to generate short light pulses (LP),- with an H-bridge (H) consisting of a first half-bridge (HB1: T1, T2) with a first transistor (T1) and a second transistor (T2) and a second half-bridge (HB2: T2, T3) with a third transistor (T3) and a fourth transistor (T4),- wherein the H-bridge (H) is controlled by a control unit (ST) and- wherein the H-bridge (H) can be operated by the control unit (ST) in pulsed mode (GPB) and in quasi-continuous mode (QDB) and- wherein the first half-bridge (HB1: T1, T2) is supplied with electrical energy from a first positive supply voltage (VCC1) and a first negative supply voltage (GND1) and- wherein the second half-bridge (HB2: T3,T4) is supplied with electrical energy from a second positive supply voltage (VCC2) and a second negative supply voltage (GND2) and- wherein the light-emitting diode (LED1) is connected with its cathode (K) to the output of the first half-bridge (HB1: T1, T2) and- wherein the light-emitting diode (LED1) is connected with its anode (A) to the output of the second half-bridge (HB2: T3, T4) and- wherein the first positive supply voltage (VCC1) and the second positive supply voltage (VCC2) can be equal and- wherein the first negative supply voltage (GND1) and the second negative supply voltage (GND2) can be equal and- wherein the light source, in particular the one or more light-emitting diodes (LED1), represents the load of the H-bridge (H) between the output of the first half-bridge (HB1: T1, T2) and the output of the second half-bridge (HB2: T3, T4) and- wherein the control device (ST) is designed to operate in pulsed mode (GPB) a “PAn” condition,in which a forward voltage in the forward direction of the light-emitting diode (LED1) is applied to the light-emitting diode (LED1) through the H-bridge (H), is not maintained by the H-bridge (H) for longer than a turn-on time (τpp), and- wherein the control device (ST) is designed so that in pulsed operation (GPB) a "PAus" state, in which a reverse voltage against the forward direction of the light-emitting diode (LED1) is applied to the light-emitting diode (LED1) through the H-bridge (H), is not maintained by the H-bridge (H) for longer than a clearing time (τpn), and- wherein the clearing time (τpn) is less than the charge carrier lifetime (τ) in the PN junction of the light-emitting diode (LED1), and- wherein the turn-on time (τpp) is less than the charge carrier lifetime (τ) in the PN junction of the light-emitting diode (LED1).

The application provides a calibration test device and system, and relates to the technical field of automatic control of engineering machinery, wherein the calibration test device is applied to engineering machinery to be installed with vehicle-mounted equipment, and the calibration test device comprises a power supply management module and a communication conversion integrated module; the power supply management module has a plurality of output interfaces, and the plurality of output interfaces are used for supplying power for each vehicle-mounted equipment; a power supply end of the communication conversion integrated module is connected with the output interfaces, the communication conversion integrated module has a plurality of communication ports, and the plurality of communication ports are used for being connected with each vehicle-mounted equipment; the communication conversion integrated module is configured to convert a plurality of protocol data output by the vehicle-mounted equipment into network protocol data, and is used for being transmitted to a debugging terminal, so that the debugging terminal calibrates and tests the vehicle-mounted equipment. The calibration test device has the advantages that calibration and test of the vehicle-mounted equipment can be directly performed in the initial state of the engineering machinery, and the modification cycle is shortened.

The application relates to the technical field of radars, in particular to a radar working mode small sample identification method based on a multi-modal model independent meta-learning, which comprises the following steps: simulating multiple radar working mode waveforms to extract corresponding pulse description word sequences and taking the pulse description word sequences as small sample tasks; converting the pulse description word sequences into multi-channel feature images and extracting sequence features and image features; mapping the sequence features and the image features to a shared feature space and obtaining fused features through weighted fusion; based on the fused features, training an initial multi-modal double-flow model independent network on the small sample tasks by adopting a model independent meta-learning framework to obtain a trained multi-modal double-flow model independent network; and classifying the working modes of query samples by using the trained multi-modal double-flow model independent network. The method can improve the rapid adaptability and reliability of a radar system in a dynamic electromagnetic environment.

The application discloses a four-dimensional joint perception communication integration method based on deep space-time-frequency distortionless response, and constructs a deep space-time-frequency distortionless response enhancement network at a receiving end; through a frequency domain weight generation mechanism of "shared prototype+role residual", cross-band common interference characteristics are extracted from the shared prototype, and independent residual branches are used to decouple the differentiated characteristics of communication and perception subcarriers, and an enhanced signal meeting a distortionless constraint is output. Then, inner and outer double-layer closed-loop iterative optimization is performed, the inner layer performs three-domain alignment and iterative enhancement on input data based on posterior estimation parameters; and the outer layer performs deterministic resource scheduling of "power saturation-aperture step" based on perception accuracy feedback. In cooperation with a dependent signal elimination and virtual aperture refinement algorithm based on an energy balance scaling factor, the application can guarantee communication rate while significantly improving four-dimensional parameter estimation accuracy and system robustness under low signal-to-noise ratio.

This application relates to the field of topographic mapping technology, specifically to a method and system for ground topographic mapping based on lidar. The method includes: acquiring point cloud data of the area to be mapped using lidar, which contains elevation, reflection intensity values, and echo counts; acquiring elevation noise characteristic values ​​for each point cloud data, and correcting them by the dispersion of echo counts from neighboring point cloud data to filter possible ground points from all point cloud data; classifying all point cloud data; acquiring ground feature degrees for each class, and correcting them by the dispersion of reflection intensity values ​​from all point cloud data in each class to extract candidate ground points from all point cloud data; extracting real ground points from all candidate ground points, and then performing ground topographic mapping of the area to be mapped. This application aims to improve the accuracy of ground topographic mapping by accurately extracting real ground points.

The application provides an air traffic control primary radar signal processing automatic test method and system, relates to the radar test field, and solves the technical problems of fragmentation of the prior art process, single evaluation dimension and poor traceability. The method specifically comprises: obtaining radar test data and structured test configuration; recursively analyzing the test configuration to generate an instruction set; loading data and executing signal replay according to the instructions to drive the software; synchronously collecting video data and processing results of each stage to form a multi-dimensional feature sequence; correlating and analyzing the two and extracting features to generate a holographic feature vector sequence; progressively comparing the sequence with a baseline determination model in layers to obtain a test determination result; integrating test item identifiers, video data, multi-dimensional feature sequences, holographic feature vector sequences and test determination results to record and generate a final test log report. An end-to-end automatic, multi-dimensional deep analysis and full-link evidence tracing radar automatic test method is realized.

The present application relates to a kind of target single-photon detection distance calculation method in turbid medium, it is related to detection field, including the following steps: light source is placed in the coordinate position of origin, one light pulse is emitted to turbid medium unidirectionally;Single-photon detector receives returned photon, and received photon is divided into three parts of turbid medium itself returned photon, hidden in turbid medium target object itself returned photon and noise photon;Respectively calculate three parts of photon flux density Green function;Using the ratio between the photon count of hidden object returned at target peak time and background photon count, when the ratio is greater than 1, hidden target object can be effectively detected, greater than 3, hidden target object can be effectively imaged;Confirm effective, the maximum detection distance of target object can be calculated, the present application has the advantages that single-photon detector in turbid medium can accurately calculate detection limit.

The application relates to the technical field of radar signal processing and multi-target positioning, and particularly discloses a simulation data automatic generation method for multi-target direct positioning. The method solves the problems of low manual configuration efficiency, non-reproducible data and physical rationality through the collaborative work of the configuration generation and data construction two stages. In the configuration generation stage, a structured CSV configuration file containing the number, position, motion parameters and signal-to-noise ratio of a radiation source is automatically generated according to multiple preset rules, a minimum distance constraint of the radiation source is introduced, and a multi-random seed independent control mechanism is introduced, so that the parameter distribution is reproducible. In the data construction stage, the configuration file is read, Doppler frequency shift modeling, multi-receiving station-multiple array element signal synthesis, time-frequency analysis and normalization processing are performed, and a data set containing time-frequency diagrams, time domain diagrams and corresponding labels is generated. The application realizes the automation from parameter definition to simulation data output, and improves the generation efficiency of the multi-target positioning algorithm training and verification data set.

The application discloses a millimeter wave-based blade-end data real-time acquisition intelligent analysis system and method, belongs to the technical field of blade monitoring, and solves the problem that the feature extraction method of the existing method is relatively single and does not fully utilize the fusion of multi-modal data and deep learning and other methods for more comprehensive feature extraction. The method comprises the following steps: based on environmental detection parameters, a millimeter wave signal is analyzed and corrected; based on an intelligent evaluation model, adaptive diagnostic evaluation operations are performed on a multi-modal feature set to obtain a blade-end evaluation result; and it is judged whether the blade-end evaluation result exceeds a preset risk threshold. The application realizes multi-dimensional analysis and correction of the millimeter wave signal after temperature correction, effectively reduces the influence of environmental interference on the signal, and adopts a Fourier transform method to perform multi-scale decomposition on the blade-end monitoring data, so that the feature information in the blade-end monitoring data can be more comprehensively mined, and the purity and stability of the signal in a dynamic environment are ensured.