22 results about "Attenuation loss" patented technology

The invention belongs to the technical field of power system load prediction, and relates to a long-range multivariable load prediction method and system based on time-frequency domain collaboration, and the system carries out the normalization and stabilization of a multivariate load time sequence through a data preprocessing module; the feature embedding module performs linear embedding on the block sequence to construct high-dimensional feature representation; the state space coding module extracts long-range dependency features and generates depth time sequence representation; the decoding prediction module maps the coding features into a preliminary prediction sequence; the time sequence alignment module identifies a leading-lagging relation among multiple variables and aligns a time sequence; the frequency domain optimization module realizes frequency domain component fusion based on adaptive filtering; and the model training optimization module is used for performing training and optimization through a signal attenuation loss function. The method can effectively improve the precision and robustness of long-range multivariable load prediction, and especially has obvious advantages in the aspects of processing complex dependency relationships and dynamic time delay.

This invention relates to the production of integrated optical waveguides on the surface of planar polymer substrates (polymer chips) using UV laser lithography. The resulting optical waveguides are multilayer optical waveguides that, when light is guided in the lower part of the optical waveguide, form radiation modes. As a result, light energy is radiated from the underside of the optical waveguide into the volume of the polymer substrate, so that it is lost to the actual light guide.Since the associated attenuation losses are usually undesirable, two different partial solutions are presented, which can then be combined to suppress the unwanted radiation modes as completely as possible. A parameter window for the UV laser lithographic production of polymeric, integrated-optical (planar) optical waveguides is presented, which is located shortly before the UV photon-induced carbonization (discoloration) of the irradiated zone of the optical waveguides to be produced. Due to the thermal effect of the incident high-energy UV excimer laser radiation, a change in the refractive index depth profile within the irradiated zone occurs above a certain radiation dose, so that no more radiation modes can form there.As a further solution, polyacrylate layers are produced by spin-coating and subsequently curing acrylate layers on a carrier substrate. These layers are too thin for radiation modes to form on the underside of the optical waveguides produced by subsequent UV exposure.

The utility model relates to the technical field of data transmission lines, in particular to a high-frequency cable for making a flat wrapping middle coating technology, which is technically characterized by comprising a core wire, a first mylar layer and a wrapping tape layer which are sequentially arranged from inside to outside, the core wire is formed by extrusion, the first mylar layer is used for fixing the core wire, and the wrapping tape layer is used for wrapping the first mylar layer. A middle coating layer is arranged between the first mylar layer and the belting layer, the middle coating layer is formed by extrusion, and the belting layer wraps the periphery of the first mylar layer. Through a multi-layer structure, efficient and stable transmission of signals is realized. The core wire adopts the copper conductor and the polyethylene insulating layer, so that accurate transmission of signals is ensured; the first mylar layer and the middle coating layer are arranged, so that the problem of dielectric coefficient in signal transmission is solved, and the high-frequency performance of the cable is improved; and the aluminum foil wrapping tape layer is added, so that the shielding effect and the structural stability of the cable are further enhanced. Through the series of design, the high-frequency cable has excellent performance in the aspects of reducing attenuation loss and improving transmission efficiency.

The utility model discloses an obstacle detection circuit, a controller and a robot, and relates to the technical field of artificial intelligence. The device comprises an ultrasonic sensor, a transformer and a signal regulator, and a secondary coil of the transformer is coupled with the ultrasonic sensor so as to excite the ultrasonic sensor through the transformer. Wherein the signal input end of the signal regulator and the ultrasonic sensor are arranged in parallel, and the driving output pin of the signal regulator is coupled with the primary coil of the transformer. Therefore, the ultrasonic sensor can be driven and excited through the transformer, the attenuation loss of sound wave energy of the ultrasonic sensor propagating in the air is met, and the propagation distance is increased. And the signal regulator is used for receiving and transmitting sound wave signals of the ultrasonic sensor. Therefore, on the basis of ensuring the detection distance of the obstacle, the hardware cost is greatly reduced.

The invention discloses an optical fiber high-speed unwinding and arranging device and method, and belongs to the technical field of optical cable preparation, and the method comprises the steps: placing a disc wound with an optical fiber at a disc placement mechanism, leading out the optical fiber from the disc, enabling the optical fiber to pass through a surface light source, and pulling the optical fiber to a guide wheel; respectively setting the rotating speed of an unwinding motor and the displacement rate of a displacement motor; the displacement detection mechanism obtains the position where the optical fiber penetrates through the area light source and controls rotation of the unwinding motor and movement of the displacement motor according to a signal received by the displacement detection mechanism so that the optical fiber can be continuously led out in the direction perpendicular to the axis of the reel. According to the optical fiber high-speed unwinding and arranging method, the position of the optical fiber on the area light source is obtained in a non-contact mode, the state of the optical fiber is judged by obtaining the position of the optical fiber, and then stable conveying of the optical fiber is achieved by correspondingly adjusting the rotating speed of the unwinding motor, the moving speed of the displacement motor and the like; and the problems of optical fiber attenuation loss and the like caused in the optical fiber unwinding process are avoided.

The application discloses a digital-twin spatial channel continuous variable quantum key distribution method, and relates to the technical field of quantum information processing.The method comprises the following steps: constructing a satellite-ground station link model between a satellite and a ground station according to satellite orbit parameter data and ground station position information, and calculating satellite-ground station link dynamic parameters; constructing an atmospheric model based on the satellite-ground station link dynamic parameters and atmospheric parameters to simulate link attenuation loss at different times under a single orbit in the satellite-ground station link; simulating quantum state preparation process to adjust quantum state parameters and combining the link attenuation loss to calculate key generation rate to distribute satellite-ground station quantum keys.The dynamic model constructed based on satellite orbit parameters and ground station positions can calculate satellite-ground station link dynamic parameters in real time, and can establish an atmospheric model to quantify link attenuation and background noise under different weather conditions, adjust quantum state preparation parameters, and maximize key generation rate under the premise of ensuring security.

The invention provides a vehicle-mounted antenna signal communication method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring duplex communication state parameters of a vehicle-mounted antenna repeater; performing channel likelihood processing on the duplex communication state parameter and a preset communication state parameter to obtain a duplex communication likelihood amount; and sending an attenuation loss signal to a channel attenuator according to the duplex communication likelihood so as to adjust the channel signal strength. After the duplex communication state parameters are collected, the communication state change condition of the vehicle-mounted antenna repeater in the current duplex communication mode is determined, and then the duplex communication state is compared with the standard communication state, so that the duplex communication state change difference degree of the vehicle-mounted antenna repeater is conveniently determined; and finally, according to the change difference degree, a signal attenuation mode in duplex communication is adjusted, so that a communication signal between the internal and external antennas of the vehicle is stable, and the internal and external duplex communication quality of the vehicle is effectively improved.

A low-loss single-mode optical fiber, which relates to the technical field of communication optical fibers. The low-loss single-mode optical fiber comprises a core layer and a cladding layer surrounding the periphery of the core layer, wherein the core layer comprises an inner core layer (100) and an outer core layer (200), the inner core layer (100) is doped with P and GeO2, and the outer core layer (200) is doped with F, P and GeO2. By means of adjusting the elements doped in the inner core layer (100) and the outer core layer (200), Rayleigh scattering is decreased, thereby achieving the aim of reducing the attenuation coefficient of the optical fiber, such that the optical fiber has lower attenuation loss and better bending resistance.

The application discloses a SiC@BN core-shell nanowire periodic array reinforced Si3N4 high-temperature wave-absorbing ceramic coating, which is composed of SiC nanowires, a BN shell layer and a Si3N4 ceramic matrix. The SiC nanowires and the BN shell layer are obtained through a chemical vapor infiltration process, and form a core-shell structure to obtain SiC@BN core-shell nanowires, which can avoid oxidation of the SiC nanowires and improve the dielectric constant of the SiC nanowires. The SiC@BN core-shell nanowires are arranged in a three-dimensional periodic array. The Si3N4 ceramic matrix is prepared through the chemical vapor infiltration process, and the Si3N4 ceramic matrix is uniformly filled in the pores between the SiC@BN core-shell nanowires. Through macro-micro multi-scale structure design, lattice distortion, stacking faults and interface defects are introduced in the micro scale to promote the absorption and attenuation loss of the incident electromagnetic wave, and the surface electric field coupling effect and multiple scattering loss mechanism are introduced in the macro scale to realize the widening of the effective absorption band and the synergistic improvement of the electromagnetic wave absorption characteristics.

The invention discloses a remote sensing ship target detection method suitable for deep learning, and belongs to the field of remote sensing ship target detection, and the method comprises the following steps: firstly, adding an EUCB-S upsampling module in a neck network to accurately capture feature information related to a remote sensing ship target; and interference of background noise and irrelevant details is reduced to the minimum. Secondly, a PAN4 feature fusion network with four detection scales is designed to fuse more target feature information, and remote sensing ship targets of different scales can be detected. And finally, providing a new loss function and bidirectional attenuation loss BAIoU on the basis of a KFIOU loss function, quantifying the similarity between a labeling frame and a prediction frame on the basis of an attenuation coefficient, an offset direction and an offset distance, improving the positioning and recognition precision of a rotating frame, and solving the problem that a remote sensing ship target has any rotation angle.

The invention discloses a digital twin space channel continuous variable quantum key distribution method, and relates to the technical field of quantum information processing, and the method comprises the steps: constructing a satellite-ground link model between a satellite and a ground station according to satellite orbit parameter data and ground receiving station position information, and calculating satellite-ground link dynamic parameters; based on the satellite-ground link dynamic parameters and the atmospheric parameters, constructing an atmospheric model to simulate link attenuation loss at different moments under a single orbit in a satellite-ground link; and simulating a quantum state preparation process to adjust quantum state parameters, and calculating a key generation rate in combination with the link attenuation loss to distribute satellite-ground quantum keys. According to the method, a dynamic model is constructed based on satellite orbit parameters and ground station positions, dynamic parameters of a satellite-ground link can be calculated in real time, an atmosphere model is established to quantify link attenuation and background noise under different weather conditions, quantum state preparation parameters are adjusted, and the key generation rate is maximized on the premise that safety is guaranteed.

The invention discloses a 6G full-band full-scene universal large-scale fading channel modeling method, which relates to the technical field of wireless communication, and comprises the following steps: step 1, representing the path loss of large-scale fading as the sum of basic loss, atmospheric fading loss, flicker loss, building penetration loss and rainfall fading, the shadow fading of large-scale fading is expressed as Gaussian distribution of a zero mean value; 2, calculating basic loss by adopting a double-slope model; 3, representing the atmospheric fading loss as the sum of the oxygen fading loss and the water vapor attenuation loss; 4, representing the scintillation loss as the sum of the ionosphere scintillation loss and the troposphere scintillation loss; 5, calculating the penetration loss of the building by adopting a double logarithmic normal distribution combination model; and step 6, calculating rainfall fading by adopting a Crane model. The large-scale fading modeling precision in the terahertz frequency band, the indoor scene and the unmanned aerial vehicle scene is higher than that of an existing standard model.

The application discloses a capacitor life prediction method and system based on a capacitor attenuation rate, and the method comprises capacitor operation data collection, out-of-group passivation loss construction, time-series capacitor attenuation loss construction, attenuation constraint loss construction, time-varying coefficient calculation, capacitor life prediction model design and capacitor life prediction. The application belongs to the field of data processing, and specifically refers to a capacitor life prediction method and system based on a capacitor attenuation rate. The scheme is designed for the time-varying out-of-group passivation loss of the out-of-group and noise problems, suppresses the out-of-group points, avoids the overall deviation of the life prediction, constructs the time-varying scale parameter to remove the false micro shaking, constructs the time-series capacitor attenuation loss fused with acceleration sensing, introduces the second-order difference of the capacitor attenuation rate to capture the accelerated degradation characteristics, constructs the attenuation constraint loss to improve the rationality of the long-term life prediction, constructs the time-varying coefficient to realize dynamic weight distribution, realizes the near short-term high-precision and long-term stable trend, and improves the capacitor life prediction effect.

The utility model belongs to the technical field of cables, and particularly relates to a cable structure which comprises a protective outer body and at least two wire harnesses. At least two parallel mounting holes are formed in the protective outer body; the two adjacent mounting holes are not communicated with each other; each of the wire harnesses is arranged in the corresponding mounting hole; at least two channels are arranged on the outer surface of each mounting hole in a surrounding manner; and a part of the channel is arranged between the two adjacent mounting holes. According to the utility model, the attenuation loss of the cable at high frequency can be reduced, and the use safety and stability are ensured.

The invention provides a data transmission line and augmented reality equipment, and solves the problems in the prior art. The data transmission line includes: a wire; the first connector is connected with the wire rod, and the first connector is configured to be connected with the head-mounted display; the at least one second connector is connected with one end, far away from the first connector, of the wire rod, the second connector is configured to be connected with a signal source, and the at least one second connector can transmit at least one data signal; and the compensation module is used for performing signal attenuation compensation on the at least one data signal. The compensation module can monitor the possible signal attenuation phenomenon of at least one data signal in the wire transmission process in real time, and automatically carries out corresponding compensation for the detected signal attenuation. Through the mechanism, the compensation module significantly improves the transmission performance of the data transmission line, and effectively reduces the signal attenuation loss caused by distance or interference, thereby guaranteeing the transmission quality and reliability of the data signal from the signal source to the head-mounted display.

This invention relates to the field of discharge detection technology, and discloses a method and apparatus for detecting partial discharge faults in underground cables based on the actual characteristics of the cables. The invention acquires high-frequency characteristic data of the underground cable under test through measurement; constructs a structural model of the underground cable; calculates the total high-frequency attenuation loss of the cable using the high-frequency characteristic data based on the model, and calculates a high-frequency attenuation constant based on the calculated total high-frequency attenuation loss value; performs partial discharge analysis on cable samples with actual partial discharge locations based on the calculated high-frequency attenuation constant value; and adjusts the model based on the comparison results between the obtained partial discharge analysis location and the actual partial discharge location to obtain an optimal high-frequency attenuation constant as the target high-frequency attenuation constant, which is then used for partial discharge fault detection in the underground cable under test. This invention uses the high-frequency attenuation constant obtained through actual measurement and modeling to detect partial discharge faults in underground cables, which can effectively improve the accuracy of partial discharge signal analysis.

The present invention discloses a method for wireless channel modeling in a high-dynamic scenario, mainly solving the problem of inaccurate channel models in the high-dynamic scenario of unmanned aerial vehicles (UAVs) in the prior art. The implementation scheme is as follows: 1) Determine the three-dimensional characteristic parameters between the UAV and the ground user equipment during the flight of the UAV; 2) Determine the elevation angle area where the UAV is located according to the elevation angle, and determine the propagation mode of radio waves and the surface characteristic information affecting the air-ground channel transmission in the current environment; 3) Obtain the current environment information, weather information of the transmitter and the receiver, and the known position information, relevant indicators of the transceiver antennas and relevant characteristics of radio waves; 4) Establish path loss and rain attenuation loss according to the information obtained in 2) and 3), and establish a total propagation loss model and an MS fading distribution model. By using the three-dimensional characteristic parameters, the present invention improves the accuracy of the channel model in the high-dynamic scenario, improves the continuity of air-ground signal coverage, and can be applied to UAV-to-ground communication.

The invention relates to a shielding for electrical or electronic components with sensitive electromagnetic compatibility, to be specific cables and wires, wiring harnesses, wire and cable connectors, cable ducts, fuses, circuits, capacitances and / or inductances. The shielding consists of a multilayer-film arrangement comprising electrically conductive constituents or materials. The multilayer-film arrangement has at least three layers based on a synthetic rubber, each of the individual layers having at least partially different shielding attenuation or absorption attenuation in terms of the shielding-frequency range in such a way that shielding-attenuation losses occurring over the shielding-frequency range are reduced and the overall shielding attenuation is increased. Each of the individual layers contains magnetic, dielectric, electrically conductive and / or resistive filling materials.

The invention relates to the technical field of wireless communication, in particular to an optimized low-altitude condition radio wave propagation prediction method and device and a storage medium, and the method comprises the steps: firstly constructing a three-dimensional collaborative database fusing high-resolution terrain elevation, atmospheric profile and earth surface material information; based on a three-dimensional graphic obstacle recognition algorithm, a low-altitude propagation loss model or a ground propagation model is adaptively selected as a dominant prediction model by analyzing the shielding proportion of an obstacle on a propagation path to a first Fresnel region. And if the low-altitude model is selected, intelligently matching the corresponding diffraction loss sub-model according to the topographic features, and calculating the topographic diffraction loss. Meanwhile, the atmospheric attenuation loss is calculated in a layered manner, and the earth surface reflection loss is calculated by combining earth surface material information. And finally, carrying out superposition calculation. According to the invention, through multi-source data fusion, propagation mechanism intelligent discrimination and multi-physical effect cooperative calculation, the precision and adaptive ability of radio wave propagation prediction in a low-altitude complex environment are significantly improved.

The invention discloses an unmanned aerial vehicle cooperative ultraviolet light relay communication system performance analysis method and device. The method comprises the following steps: establishing a ground-air ultraviolet light non-direct-view single link channel model under an atmospheric turbulence channel; based on a ground-air ultraviolet light non-direct-view single link channel model, respectively calculating attenuation loss caused by scattering related to a path distance and attenuation loss caused by atmospheric turbulence; modeling fading caused by atmospheric turbulence through a logarithmic normal distribution model; and respectively calculating the outage probability and the average bit error rate of the unmanned aerial vehicle cooperative ultraviolet light relay communication system considering the attenuation loss and the atmospheric turbulence. Based on a wireless ultraviolet light non-direct-view communication model, an ultraviolet light non-direct-view single scattering communication link model is established, and on the basis of the model, the influence of attenuation loss and atmospheric turbulence on the performance of an ultraviolet communication system is comprehensively considered. Therefore, the performance of the unmanned aerial vehicle cooperation ultraviolet light relay communication system can be rapidly and reliably evaluated under the complex atmospheric condition.

A vehicle window glass (100), a vehicle window assembly (400), and a vehicle (1000). The vehicle window glass (100) has a signal transmission area (E) for a detection signal (S1) and an echo signal (S2) to pass through, and the signal transmission area (E) has a transmittance of at least 75% for an incident detection signal (S1) having an angle of incidence (β) of 50°-70°; the number of points in space scanned each time by each line of the detection signal (S1) is N. When the detection distance between a target object (P) and a laser radar (200) is 100 meters, the echo signal (S2) received by the laser radar (200) comprises at least X1 pieces of point cloud data, wherein X1≥N / 200 and X1≥3, N≥400. The vehicle window glass (100) can reduce the attenuation loss of the detection signal (S1) and the echo signal (S2) when the signals pass through the signal transmission area (E), so that the laser radar (200) located inside of the vehicle receives enough point cloud data, thereby achieving high-precision recognition of the target object (P), and simultaneously satisfying the three use requirements that the laser radar (200) be able to see far, see clearly, and see stably.

The application discloses an OTDR event detection method and relates to the technical field of data analysis. The method comprises the following steps: acquiring an OTDR response curve of a communication optical fiber to be detected and performing wavelet denoising processing to obtain wavelet coefficients decomposed to each layer; an improved simulated annealing algorithm is used to acquire optimal threshold values of the wavelet coefficients of each layer, and threshold value processing is performed on the wavelet coefficients of each layer, a signal is reconstructed, and a denoised OTDR response curve is obtained; a middle data section of the denoised response curve is extracted, suspected reflection events and non-suspected reflection events are found out in the middle data section, false points caused by noise in the suspected events are removed according to event interval distances and event duration distances, and finally, reflection event position information, non-reflection event position information and the attenuation loss of each event are determined. The method can obtain a response curve with a higher signal-to-noise ratio, intelligently acquires the sizes of each threshold value through the improved simulated annealing algorithm, and reduces the error probability of reported events.