598 results about "Signal reflection" patented technology

The invention discloses a self-adaptive impedance matching method for a high-frequency signal transmission connector of a new energy vehicle, and relates to the technical field of signal processing, and the method comprises the steps: 1, obtaining the physical parameters of the high-frequency signal transmission connector of the new energy vehicle; calculating an electromagnetic field feature vector, and calculating a transmission line distribution vector of the high-frequency signal transmission connector; 2, calculating a propagation constant of a high-frequency signal transmission connector of the new energy vehicle; calculating the characteristic impedance of a high-frequency signal transmission connector of the new energy vehicle; 3, calculating a reflection coefficient; calculating an impedance error; step 4, calculating a compensation parameter vector, and generating a control signal by using an adaptive control theory according to the compensation parameter vector; and calculating the impedance matching degree according to the control signal. According to the invention, impedance change in a complex environment can be accurately dealt with, signal reflection and energy loss are significantly reduced, and transmission efficiency and signal integrity are improved.

The invention relates to the technical field of stone structure ultrasonic detection, in particular to a stone structure building detection method based on a concrete ultrasonic fault detection scanner, and the method comprises the steps: obtaining the initial signal intensity when an ultrasonic signal is transmitted by using the ultrasonic fault detection scanner; obtaining an ultrasonic reflection signal after the ultrasonic signal is reflected at each reflection point under each scanning layer, the intensity of the reflection signal after reflection, and the signal propagation duration; the method comprises the following steps of: obtaining a signal propagation time difference, a signal intensity difference, a signal difference index, a signal disorder degree, a defect evaluation coefficient, a seam recognition degree and a seam correction coefficient of each reflection point under each scanning layer, correcting the intensity of a reflection signal, performing three-dimensional reconstruction on a constructed tomography graph, and detecting internal defects of a stone structure building. According to the method, the interference of the reflection points on the splicing seams during stone splicing is reduced, the accuracy of detecting the internal defects of the stone structure building is improved, and the stability detection of the stone structure building is improved.

The invention discloses a lineation robot control system based on a satellite positioning and orientation technology, which relates to the technical field of robot motion control and comprises a satellite positioning and orientation module, an inertial navigation module, a fusion positioning and orientation software module, a motor control software module, a motion control software module and a pattern planning software module. The satellite positioning and orientation module is used for acquiring latitude and longitude coordinates of the current position of the robot by receiving multi-frequency satellite signals; the inertial navigation module is used for collecting posture and motion data of the robot in real time through a gyroscope and an accelerometer. According to the lineation robot control system provided by the invention, through collaborative design of the multi-frequency-point GNSS receiver and the anti-multipath interference antenna array, centimeter-level continuous positioning capability in a complex urban environment is realized, and satellite signal reflection and shielding interference in scenes such as viaducts and avenues are effectively overcome; and satellite positioning and inertial navigation data are deeply fused through a tight coupling Kalman filtering algorithm.

Systems and methods relating to a millimeter wave radio-frequency (RF) sleep monitoring device are described. The device includes a surface transparent to RF signals through which a radar device enclosed in a housing transmits RF signals. An antenna array is enclosed within the housing and is oriented at a non-zero angle with respect to a vertical axis of the device. The antenna array receives the reflected RF signals through the surface. The reflected RF signals are used to generate sleep monitoring data such as a respiratory rate or motion data associated with a user.

The invention discloses a coal mine underground navigation control system and device based on big data, and particularly relates to the technical field of underground navigation control. The underground roadway waveguide effect grade is judged by monitoring underground radio signals in real time and recognizing a signal reflection mode by combining wavelet transform with a convolutional neural network; meanwhile, three-dimensional point cloud data of the underground roadway are processed through multi-scale curvature analysis and a DBSCAN clustering algorithm, and division of a structure mutation region is achieved; determining a navigation error level according to the waveguide effect level and a structure mutation result, and when the navigation error level reaches a second level or a third level, analyzing historical navigation trajectory data by using a dynamic time warping algorithm, and evaluating a current navigation path deviation degree; comprehensive analysis is carried out through the deep belief network, the reliability of the navigation control system is evaluated, whether a path re-planning instruction is triggered or not is judged, and the underground navigation precision and safety are improved.

The invention relates to the technical field of cable anti-interference, and discloses a high-frequency coaxial cable anti-interference method and device.The method comprises the steps that a radial progressive impedance gradient double-layer shielding structure with an inner shielding layer and an outer shielding layer is constructed, and a triangular supporting frame structure is arranged between the inner shielding layer and the outer shielding layer; an electromagnetic induction probe is installed on the triangular supporting frame structure, and differential interference signals between the inner shielding layer and the outer shielding layer are collected; performing time-frequency domain conjoint analysis on the differential interference signal to obtain an interference source feature mapping map; and performing multi-mode interference identification and suppression according to the interference source characteristic mapping map to generate an interference offset signal, and performing real-time elimination and feedback on electromagnetic interference in the inner shielding layer and the outer shielding layer based on the interference offset signal to obtain an interference offset feedback effect. And signal reflection and crosstalk among the structures of all layers in the cable are effectively compensated.

The invention discloses a power supply communication method and device based on power line carrier communication, and relates to the technical field of power supply communication. Problems of signal attenuation, insufficient anti-interference capability, insufficient stability of power supply communication, insufficient intelligent path switching capability and the like exist in the prior art. According to the method, high-sampling-rate PSD analysis, STFT and LSTM are adopted to predict noise power time sequence data, and a noise-load rate coupling model is established; secondly, based on a transmission line theory, researching channel time-varying characteristics, calculating signal reflection and multipath effects, and calculating channel coherence time through a sliding window; for signal attenuation, low, medium and high frequency band models are respectively established, path attenuation is calculated, and channel capacity is optimized; and finally, through real-time stability analysis, short-term and long-term SNR stability is calculated, and path selection is optimized in combination with a load rate, so that communication quality is ensured. And through integration of channel modeling, time-varying analysis and path optimization, the reliability and stability of power line carrier communication are improved.

The invention discloses a GPU hot plug method, device and equipment and a storage medium, and relates to the technical field of computers, and the method comprises the steps: processing an initial surge current peak value based on a reverse compensation signal generated by an initial power phase difference between a mainboard and a GPU, and determining a to-be-optimized network signal based on an obtained target surge current peak value and an initial network signal; adjusting the initial signal reflection coefficient of the to-be-optimized network signal by using the programmable LC array, optimizing the to-be-optimized network signal by using the obtained target signal reflection coefficient, performing protocol compatibility processing on the mainboard and the GPU based on the obtained target network signal, and diagnosing the obtained target GPU. And after the obtained diagnosis result represents that the diagnosis is passed, performing hot plugging by using a preset plugging protocol, a GPS synchronous clock and a prediction result of the temperature, the load and the surge current peak value of the target GPU predicted by the prediction model. In this way, the security of executing the GPU hot plug operation can be improved.

The invention relates to the technical field of lithium battery water content detection, in particular to a lithium battery water content detection method and system. The method comprises the following steps: acquiring a lithium battery surface thermal imaging image; carrying out temperature gradient distribution identification on the lithium battery surface thermal imaging image, and carrying out local distribution change sudden change detection to extract a temperature imbalance region and a temperature conventional region; carrying out optimal penetrating electromagnetic wave frequency calculation according to the temperature imbalance region and the temperature conventional region, carrying out a multi-band electromagnetic wave penetration test, and collecting electromagnetic reflection signals of the temperature imbalance region and the temperature conventional region; and performing multi-frequency-band reflection signal intensity calculation and region-by-region comprehensive reflection characteristic mining on the electromagnetic reflection signal to obtain a temperature imbalance region signal reflection characteristic and a temperature conventional region signal reflection characteristic. According to the invention, efficient and accurate lithium battery water content detection is realized.

The invention provides a cable fault online positioning method, device and system. The method comprises the following steps: acquiring an incident signal and a reflected signal; the incident signal is a signal injected into a to-be-detected cable, and the reflected signal is a signal generated by reflection at a fault point in the to-be-detected cable; the to-be-detected cable is in an online state; fourier decomposition is carried out according to the incident signal and the reflection signal, and a reflection coefficient test spectrum of the cable fault point is obtained; and carrying out online positioning on a cable fault point according to the reflection coefficient test spectrum. According to the invention, online, efficient and accurate fault point positioning of the cable can be realized, and the safety and stability of the cable are improved.

The invention relates to the technical field of data processing, and provides a data processing method for testing avionics equipment, which comprises the following steps of: testing a communication optical cable of an aircraft communication system through an optical time domain reflectometer; analyzing the deviation between the loss value of the reflection intensity of the optical signal at each moment and the reflection loss threshold value to obtain the fault probability of the optical cable in the monitoring time period; analyzing the difference between the moment when the optical signal reaches the bending position of the optical cable and the moment corresponding to the peak point, and obtaining the reflection unpredictability of the optical signal in the monitoring time period; combining the light source power difference to obtain an optical cable performance error in the monitoring time period; obtaining the extra loss degree of the optical cable in the monitoring time period by combining the change condition of the temperature data; determining a test result correction coefficient of the monitoring time period; and correcting the reflected signal oscillogram, and testing the communication optical cable. The invention aims to solve the problem that the actual performance judgment of the optical cable is influenced by the fine change interference of various factors in the optical signal propagation process of the communication optical cable.

The invention relates to the field of audio playing control, in particular to an audio playing control method and device, equipment and a storage medium. The method comprises the following steps: acquiring a real-time playing audio signal and a spatial multi-angle reflection audio signal; performing one-by-one angle signal reflection time calculation and audio spatial three-dimensional form modeling on the spatial multi-angle reflection audio signals to construct a three-dimensional audio spatial form model; performing spatial angle reflection attenuation evolution on the spatial multi-angle reflection audio signals one by one, and performing spatial audio attenuation correction based on the three-dimensional audio spatial form model so as to obtain spatial attenuation compensation audio signals; and carrying out audio rhythm fluctuation analysis on the spatial attenuation compensation audio signal, and carrying out deep audio semantic analysis so as to obtain an audio semantic feature of the audio signal. According to the invention, personalized audio playing is realized, the audio parameters are dynamically adjusted based on the environmental noise, and the audio experience of the user is improved.

To improve a technique of remotely measuring the moisture content of a soil by using measurement data with a GNSS.SOLUTION: A information processing device 20 includes a control unit 21 for acquiring height information indicating the height of an antenna 10 receiving a satellite signal transmitted from a satellite, and signal information indicating the signal-to-noise ratio of a received signal including the satellite signal and a reflection signal generated by the reflection of the satellite signal in the soil of the ground where the antenna is set, received by the antenna, estimating a penetration depth representing the depth to which the satellite signal penetrated into the soil before the reflection signal is generated, on the basis of the acquired height information and signal information; and calculating the water content of the soil by using the obtained estimated value of the penetration depth.SELECTED DRAWING: Figure 1

The invention discloses a personnel positioning method based on a Beidou and LoRa ad hoc network, and relates to the technical field of Beidou and LoRa ad hoc networks. By combining a Beidou positioning module and a LoRa communication module, accurate transmission and error prediction of positioning information in a complex terrain or an urban environment are realized, specifically, the LoRa module forms an ad hoc network through automatic scanning and carries out detailed signal strength and quality data measurement and analysis in a multi-path effect influence area, so that the accuracy and the accuracy of the positioning information are improved. Through deep analysis of the multipath effect, the system can evaluate and predict positioning errors in advance, thereby improving accuracy and reliability of positioning information, effectively coping with delay and interference caused by signal reflection, and ensuring stable communication and accurate positioning in a complex environment.

Method for detecting a state of a connection between an electrically driven motor vehicle (1) and a corresponding charging station, wherein the motor vehicle (1) has a “Control Pilot (CP)” function with a vehicle-side “Control Pilot (CP)” line (3), characterized in that a length of a “Control Pilot” line between the motor vehicle and the charging station is measured by means of a “Power Line Communication” (PLC) chip (4), wherein the length of the “Control Pilot” line between the vehicle and the charging station using signal reflection and signal attenuation or -runtime is measured, wherein the PLC chip (4) sends a signal along the CP line between the motor vehicle and the charging station and receives the signal reflected at the end of the CP line between the motor vehicle and the charging station and running back to the PLC chip (4), wherein the length of the path traversed by the signal is determined based on the signal runtime, wherein the length of the CP line between the motor vehicle and the charging station is clearly determined from the distance traveled by the signal and a specific cable type is determined based on the length of the CP line between the motor vehicle and the charging station.

The invention relates to a single-layer waveguide antenna structure which is formed by splicing a PCB main board and a waveguide board, a stand column-mushroom pin composite structure is arranged in the single-layer waveguide antenna structure, mushroom pins are arranged in the PCB main board, stand columns are arranged in the waveguide board, and a transmission waveguide wall, a radiation waveguide wall and a grounding layer are further arranged in the PCB main board; a transmission waveguide cavity and a radiation cavity are also arranged in the waveguide plate; the transmission waveguide wall, the mushroom pin, the transmission waveguide cavity and the stand column form a closed waveguide cavity, and the transmission waveguide wall serves as a bottom H face of the waveguide cavity, so that a single-layer waveguide antenna structure is achieved. By the adoption of the single-layer waveguide antenna structure, the bottleneck problems of high-frequency signal reflection loss, adjacent channel coupling crosstalk and the like caused by a heterogeneous material interface and sensitive assembly tolerance between a traditional waveguide system and a PCB are solved, the number of stand columns in a waveguide plate can be effectively reduced, and the manufacturing difficulty of the waveguide plate can be simplified.

The invention discloses an optical cable state intelligent monitoring system and method, and belongs to the technical field of optical cable state evaluation, and the method specifically comprises the steps: collecting optical cable related data in real time, including the structural parameters and optical signals of an optical cable, and carrying out the preprocessing of the collected optical cable related data, calculating the state of an optical cable power transmission line according to the preprocessed optical cable related data, and evaluating the state of the optical cable power transmission line; multiple factors such as optical signal reflection intensity, optical cable structure parameters, environmental data and bending influence are combined to form a comprehensive overall state evaluation model, the overall state of an optical cable line can be evaluated more comprehensively by integrating multiple influence factors, adjustment and optimization can be carried out according to different lines, equipment and environmental conditions, and the overall state of the optical cable line can be evaluated more comprehensively. And the requirements in different scenes are met.

The embodiment of the invention provides communication equipment and a communication method, which are applied to the technical field of wireless communication. The communication device comprises a control circuit, a radio frequency integrated circuit and an antenna structure. The radio frequency integrated circuit is used for transmitting and / or receiving a radio frequency signal based on the antenna structure. And the control circuit is used for switching the working parameters of the antenna structure hardware from the current first parameter value to the second parameter value. And outputting a first parameter control signal according to the device state information of the communication device under the first parameter value and the second parameter value, wherein the first parameter control signal is used for updating and setting the hardware working parameter of the antenna structure as the first target parameter value. The hardware working parameters comprise the impedance size of the antenna structure and / or the aperture size of the antenna structure, and the equipment state information at least comprises a signal reflection coefficient of the antenna structure. According to the embodiment of the invention, high-precision optimization of the communication performance of the antenna structure is realized.

The embodiments relate to a radar control device and method. Specifically, a radar control device according to the embodiments may include a transceiver configured to transmit a transmission signal to the surroundings of a host vehicle and receive a reception signal received by reflecting the transmission signal on an object, a determiner configured to generate a first range-Doppler map by performing fast Fourier transform (FFT) on the reception signal and generate a second range-Doppler map based on a comparison group including a plurality of preset temporary lateral distances, and determine a correlation coefficient between the first range-Doppler map and the second range-Doppler map, and an estimator configured to estimate a lateral distance between the host vehicle and the object based on the correlation coefficient.

Certain aspects of the present disclosure provide techniques for wireless communications. One example method includes receiving, from a backscatter device, a spatial multiplexing capability report; transmitting, to the backscatter device, a reference signal reflection configuration; and transmitting, to the backscatter device, a transmission grant for a backscatter link.

The invention belongs to the field of wireless communication, and particularly relates to a low-loss radio frequency coaxial cable and a manufacturing method thereof. The inner conductor of the radio frequency coaxial cable is subjected to surface treatment, so that the adhesive force between the inner conductor and the insulating layer is improved, the transmission loss is reduced, and the signal transmission performance is improved. After the surface of the inner conductor is subjected to proper process treatment, the contact performance can be improved, and signal reflection and loss increase can be avoided. On the premise of meeting the test requirements of insulation adhesive force, standing wave and insulation voltage resistance, the surface of the inner conductor of the radio-frequency coaxial cable is moderately processed, so that the attenuation index of the radio-frequency coaxial cable is integrally optimized by 3.3%-6.0% under the frequency bands of 900MHz, 1800MHz, 2700MHz and the like compared with that of an existing product.

The invention discloses a framing system for synchronously measuring multiple parameters in a combustion process, and relates to the technical field of combustion process measurement. The two imaging lenses with the same specification are connected through the adapter ring to serve as a detection lens group; three dichroscopes are arranged behind the first dichroscope, a transmission signal of the first dichroscope is used for acquiring an OH-PLIF signal, and a reflection signal enters the second dichroscope; a reflection signal of the second dichroscope is used for acquiring a kerosene PLIF signal, and a transmission signal enters the third dichroscope; a reflection signal of the third dichroscope is used for acquiring a spontaneous radiation signal of a CH * group, and a transmission signal of the third dichroscope is used for acquiring a scattering signal of laser required by PIV (particle image velocimetry) detection; combustion image detection equipment is respectively arranged behind the first three signals; and a PIV image detection device is arranged behind the latter signal. Through combination of the three dichroscopes, multi-parameter synchronous measurement of OH-PLIF, kerosene PLIF, CH * group spontaneous radiation and PIV particle image velocimetry is realized.

The invention relates to a building fire drill evaluation system and method based on WiFi signal positioning, and belongs to the technical field of rescue drill, and the system comprises a visual capturing module which is used for capturing a drill scene and recognizing rescue workers and rescued persons in the scene; the WiFi signal module is used for capturing WiFi signal changes and analyzing signal reflection characteristics so as to track personnel positions and action changes; the data processing module is used for performing synchronization, fusion and feature extraction on the video data collected by the visual capture module and the WiFi signal data; and the effect evaluation module is used for automatically generating a detailed drill evaluation report, and the report comprises key indexes, behavior analysis and video playback. According to the invention, escape and position conditions of people in a building and rescue conditions of rescue workers can be simulated when a disaster occurs.

This application discloses an antenna system comprising a first radiating source, a second radiating source, a reflecting device, and a first transmitting device. The transmitting ports of the first and second radiating sources are arranged opposite to each other along the same axis, and the reflecting surface of the reflecting device is positioned opposite to the first transmitting device. The first radiating source transmits a first signal to the reflecting surface of the reflecting device; the reflecting device reflects the first signal through the reflecting surface to the annular transmission region of the first transmitting device; the first transmitting device radiates the first signal reflected by the reflecting surface out of the antenna system through the annular transmission region; the second radiating source transmits a second signal, which is radiated out of the antenna system through the area formed by the inner diameter of the annular transmission region. This achieves common-aperture radiation of signals from different transmitting ports with independent radiation paths, improving the radiation efficiency of the antenna system.

The invention relates to the technical field of FPC (Flexible Printed Circuit) laminated structure optimization, in particular to a module FPC laminated structure optimization system based on signal integrity, which comprises a laminated parameter sensitivity extraction module used for defining the thickness of a dielectric layer, the thickness of a copper foil and a dielectric constant as closed interval values with upper and lower boundaries according to FPC design specifications. According to the method, the accumulated deviation area and the normalized confidence score are obtained in combination with integral operation, conversion from a frequency domain to a time domain and from qualitative analysis to quantitative evaluation is achieved, tiny flaws of impedance continuity are captured, inferior paths are screened based on the confidence score, and a physical junction area is positioned. The geometric gravity center of the deviation area is calculated to be matched with the slope and the length of the gradient line, a smoothly-transited geometric figure is constructed, structural compensation can be achieved in areas where impedance is prone to sudden change such as a reinforcing plate junction and covering film pressing, and signal reflection caused by physical sudden change of a stacked structure is eliminated.

The utility model provides a communication signal enhancement reflector based on open source hardware, which relates to the technical field of signal reception, and comprises a bottom plate arranged at the lowest part, a reflection pot is arranged above the bottom plate, an expansion device is arranged on the back of the reflection pot, the expansion device comprises a containing groove, the containing groove is connected with the reflection pot in a sliding manner, and the bottom plate is provided with an opening. The storage groove is in an arc shape, and a cavity is formed in the storage groove. According to the communication signal enhancement reflector based on the open source hardware, by arranging the storage groove, when a signal is weak and signal strength needs to be enhanced, the arc-shaped electric push rod drives the storage groove to move, and the arc-shaped reflection plate extends out of the storage groove through flow guide of the arc-shaped flow guide block in the movement process of the storage groove; therefore, the area of the reflection pot capable of receiving reflection signals is increased, the reflection quantity of the signals is improved, the wave gathering tube can receive more signals, and the purpose of enhancing the reflection intensity of the signals is achieved.

The invention discloses a Beidou GNSS-R-based strong wind disaster monitoring and early warning method, and the method comprises the steps: 1, enabling an unmanned plane to carry GNSS-R receiving equipment to be located at the periphery of a strong precipitation region, carrying out the wind speed detection of an internal water surface, and carrying out the data calculation of an obtained satellite observation quantity; step 2, constructing an LSTM wind speed inversion model fused with two-factor decoupling, performing inversion prediction on the water surface wind speed of a reflection point area by inputting the received satellite observed quantity and a resolving result and performing error correction, and obtaining future time step wind speed prediction based on a past time step wind speed inversion result; step 3, establishing a boundary adaptive grid and a dynamically updated Kriging interpolation model, obtaining wind speed data of a specific signal reflection point missing area, and assisting wind speed data supplement of the reflection point missing area; and 4, constructing a wind speed time sequence extrapolation and inversion stability coordinated double-effect strong wind early warning strategy, judging whether strong wind is about to appear or not, and performing early warning.

Method and system for deriving interbeat interval (IB1) measurement of subject. A radar device receives a reflection radar signal reflected from subject. A signal portion of reflection radar signal at a range of subject is extracted, the signal portion collected over predefined intervals and consisting of an in-phase component and a quadrature component. The signal portion is filtered by applying a complex valued continuous wavelet transform (CWT) to derive a time domain ballistocardiograph (BCG) signal with cyclically repeating features, such that the time displacement between repeating features of the derived BCG signal is representative of a first heartbeat interval measurement of subject. At least one segment of the BCG signal over a selected time duration may be identified using a matrix profile technique, such that the time displacement between successive identified segments is representative of a second heartbeat interval measurement. Radar signal may be THz / millimeter-wave and FMCW radar signal.

The invention discloses a method for realizing perception based on an SSB signal in 5G NR, and the method comprises the following steps: an RRU periodically transmits a scanning signal of the SSB, and meanwhile, a user and a target in an environment reflect the transmitted signal; the RRU receives the reflected signals, data in the reflected signals are stripped and written into a compressed sensing form, the data are converted into data delayed in a grid model, unitary transformation is carried out, and then estimation is carried out through a UAMP-SBL algorithm; writing an obtained multipath estimation result into a compressed sensing form according to the condition that multiple paths have the same delay, and separating and estimating the multiple paths at different angles by using an OGSBI algorithm; and judging which RRU each group of parameters belongs to according to the estimated angle and the emission angles of different RRUs during emission. According to the method, the sensing precision can be remarkably improved, the calculation complexity is reduced, and higher robustness is achieved.

Disclosed are systems and techniques for efficient joint communications and radio frequency (RF) sensing. For example, a method for communications and sensing can include receiving, by a receiver, a first signal based on a reflection of a second signal from a target, wherein the first signal comprises a waveform including a plurality of communications instances and a plurality of sensing instances. The method can include determining, using radio frequency sensing, at least one characteristic of the target based on information in at least one of the plurality of sensing instances.