81 results about "Radiowave propagation" patented technology

A radio wave propagation environment reproduction system according to an embodiment includes: a transmitter to transmit radio waves in a predetermined direction in a reverberation chamber; a reflection angle change RIS to reflect the radio waves transmitted; an installation angle controller to control an installation angle of the reflection angle change RIS; a reflection angle controller to control a reflection angle of the radio waves; a direction-of-arrival estimator to estimate a direction of arrival of the radio waves reflected; and a control server to control the installation angle controller and the reflection angle controller on the basis of the direction of arrival of the radio waves estimated.

The invention provides a total electron amount calculation and correction method for space-based detection ionosphere data. The method comprises the following steps: converting an earth-fixed coordinate system; calculating collision parameters; sorting collision parameters and phase arrays; performing phase calibration; and obscuration correction of the total electron amount. The method has the beneficial effects that according to the forward relation between the total electron content of the ionosphere and the additional time delay of radio wave propagation caused by the ionosphere, the accurate total electron content is obtained from the satellite-ground radio detection ionosphere data by using a calculation and correction method; the method is of great significance in the aspects of satellite positioning navigation radio wave correction, space environment monitoring and the like.

A device (100) and a method (200) for evaluating a radio wave propagation a wireless communication in an environment (300) is provided. The method (200) comprises the step of obtaining (S202) a first path (320) of the radio wave propagation (300) in the environment (300), the first path comprising interaction points of a sequence of interactions of the radio wave propagation with physical objects (308) in the environment (300), the first path (320) further comprising a segment (314; 316) between each pair of the subsequent interaction points. The method (200) further comprises the step of modify (S204) the first path (320) by shifting the at least one interaction point of the first path (320) from a first location (310) to a second location (312), resulting in a second path (322) comprising at least one modified segment (314; 316). The method (200) further comprises the step of determining (S206) at least one adjusted interaction within at least one segment (314; 316) between at least one pair of subsequent interaction points in the second path (322) by tracing the at least one modified segment (314; 316) of the second path (322) in the environment (300). The method (200) further comprises the step of evaluating (S208) the radio wave propagation along the second path (322) for each segment (314; 316) according to the at least one adjusted interaction and each interaction at the at least one shifted interaction point.

This disclosure relates to a propagation environment estimation system capable of creating an environment for increasing, through learning, the simulation accuracy for propagation characteristics of wireless radio waves. This propagation environment estimation system comprises a simulation circuit and an error calculation circuit. The simulation circuit receives data of a verification area and a wireless radio wave source. Further, the propagation characteristics of the wireless radio waves in the verification area are simulated on the basis of the data. The error calculation circuit calculates an error between the simulation results and the results of verification of the propagation characteristics of the wireless radio waves in the verification area. Further, a parameter used by a learning model of the simulation circuit is updated so as to reduce the error. The simulation circuit receives the trained learning model. Further, the propagation characteristics of the wireless radio waves are simulated by using the trained learning model for newly inputted data.

To solve the problem in which human sensing detection using a radio wave method of an IQ signal does not produce results consistent with a radio wave propagation theory in enclosed spaces, such as unit bathrooms, where metal is embedded in walls.SOLUTION: A human sensing detection method using radio waves utilizing radio wave absorption characteristics of a human body includes measuring the total amount of radio waves when no one is present in an enclosed space in which there is provided a single or multiple radio wave sensors including at least a reference radio wave oscillation unit, a radio wave transmitting unit, a transmitting antenna unit, a receiving antenna unit, a radio wave receiving unit, an IQ signal processing unit, a distance calculation unit, a movement calculation unit, a memory unit for each reflected wave component, and a power supply unit, storing a value for each reflected wave component, extracting a component whose value, which is stored when no one is present, decreases each time someone enters the space and moves around, and thereby detecting a position and movement of a person. The human sensing detection method makes it easy to detect the location and movement of the person.SELECTED DRAWING: Figure 1

A reflecting device in an embodiment according to the present invention includes common electrodes arranged in a matrix at a distance in a first direction and a second direction intersecting the first direction, bias electrodes arranged overlapping the common electrodes in a planar view, a liquid crystal layer between the common electrodes and the bias electrodes, and common wirings connecting adjacent common electrodes among the common electrodes. Each of the common wirings has a length of half an effective wavelength λg when a radio wave of a specific wavelength λ propagates through the liquid crystal layer.

[Problem] Provided is a measurement system for a radio wave propagation characteristic capable of achieving a measurement with higher accuracy by eliminating influences of a human and a wired cable in the measurement of the radio wave propagation characteristic in a space. [Solution] The measurement system for a radio wave propagation characteristic includes a base station 3 and a mobile terminal 20 wirelessly communicable with the base station 3. The base station 3 and the mobile terminal 20 are mutually synchronized in time, frequency, and phase. A propagation characteristic of a radio wave wirelessly communicated between the mobile terminal 20 moving in a measurement target space and the base station 3 is sequentially measured on a time-series basis in association with each piece of position information of the mobile terminal 20.

A heat-ray reflecting substrate (10) comprises a dielectric substrate (11) and a heat-ray reflecting film (13) on at least one principal surface of the dielectric substrate. The heat-ray reflecting substrate includes a radio wave transmissive region (A) in at least a section on the at least one principal surface in plan view. The radio wave transmissive region (A) includes a first repetitive pattern (15) that is formed by a slit section (14) in which no heat-ray reflecting film is present. The first repetitive pattern (15) includes at least two first unit patterns (151a, 151b) that extend along a first axial direction. Each of the first unit patterns (151a, 151b) includes: a first line section (154a, 154b) that extends in the first axial direction; and a first connection section (155a, 155b) having a prescribed configuration.

An information processing system and a program are provided that generate spatial layout data used for radio wave propagation estimation based on spatial feature data within a building. [Solution] In an information processing system 10, a program causes an information processing device 100, which is a computer, to function as an acquisition unit that acquires spatial feature data indicating the characteristics of the space within a building, and as a layout data generation unit that generates spatial layout data of the space used for radio wave propagation estimation based on the spatial feature data.

The present disclosure relates to a restoration priority determination system comprising: a failure detection unit that detects a failure of at least one base station among a plurality of base stations; a radio wave propagation estimation unit that estimates, in a coverage area of the failure base station detected by the failure detection unit, the arrival status of radio waves from a neighboring base station other than the failure base station among the plurality of base stations; and a determination unit that determines the restoration priority of the failure base station on the basis of the result of the estimation by the radio wave propagation estimation unit.

Provided is a system that, when a service area is optimized via beamforming control, can obtain optimal antenna parameters by taking into account the radio wave propagation characteristics of the actual environment, and can lower the calculation load required to optimize the service area. The system pre-calculates and stores radio wave propagation characteristics for each of a plurality of radio wave propagation paths between one or more transmission points assumed for a terrestrial base station or an aerial relay type communication relay device and a plurality of reception points assumed for the service area, estimates the locations of a plurality of terminal devices within the service area, optimizes antenna parameters of a service link antenna on the basis of the results of calculating the radio wave propagation characteristics of the plurality of radio wave propagation paths and the results of estimating the locations of the plurality of terminal devices, and applies the optimal values of the antenna parameters to the service link antenna after the optimization is completed.

A vehicle is a movable vehicle and includes an access point function unit having an antenna and configured to function as an access point by wirelessly communicating with a terminal device located near the antenna and a control unit configured to control a directivity direction of radio waves transmitted through the antenna so that a radio wave intensity of radio waves transmitted to a predetermined first region set on the basis of a surrounding environment of the antenna is less than a radio wave intensity of radio waves transmitted to a second region other than the first region.

The invention relates to an anti-electric-shock high-voltage line near electric field source gridding positioning method for crane hoisting, and belongs to the technical field of high-voltage line near electric field source positioning. The method comprises the steps of firstly constructing a high-voltage line near electric field source radio wave propagation model; calculating the receiving signal intensity of the electric field induction device aiming at the near electric field source radiation signal; establishing a differential field intensity model of a high-voltage line near electric field source receiving signal by adopting a gridding multi-site monitoring mode; establishing a high-voltage line near electric field source positioning model; and solving the high-voltage line near electric field source positioning model to obtain high-voltage line near electric field source position coordinates. According to the invention, strong interference resistance, high accuracy and stable positioning result calculation of the near electric field source near the high-voltage line in the hoisting operation are effectively ensured, and reliable safety early warning can be provided for electric shock prevention of the hoisting operation of the crane.

A method includes generating a plurality of areas to which one of a plurality of transmission power values is allocated on the basis of at least the location of a first wireless device, the plurality of transmission power values, and a plurality of radio wave propagation models; and determining a transmission power value of a second wireless device on the basis of a transmission power value allocated to an area that does not include the location of the second wireless device. The generating includes calculating an area candidate using one of the plurality of radio wave propagation models, confirming validity of the used radio wave propagation model on the basis of a distance between a boundary of the area candidate and the first wireless device, and calculating another area candidate by using another radio wave propagation model in a case where the used radio wave propagation model is invalid.

To reduce a time required to design the placement of transmitters and receivers in a target area when performing sensing using wireless communication.SOLUTION: An equipment layout design device 300 includes: a placement candidate acquisition unit 331 that acquires candidate placement positions for the transmitter and receiver in the target area; a first model creation unit 332 that creates model information for the target area that reflects the positions of the transmitter and receiver using radio wave propagation simulation to calculate radio wave propagation information for the target area; a first CSI prediction unit 333 that calculates the radio wave propagation information from the transmitter to the receiver using the radio wave propagation simulation and the model information and predicts propagation channel information obtained by the receiver for each of multiple subcarriers of a radio signal received by the receiver placed in the target area; and an evaluation calculation unit 336 that evaluates the placement position of the receiver on the basis of an amplitude value of the propagation channel information for each of the multiple subcarriers.SELECTED DRAWING: Figure 4

This design device comprises: an input unit that acquires area information and design constraint information; an analysis unit that generates a radio wave propagation analysis result on the basis of the area information and the design constraint information; and a design unit that determines a pattern of a reflection plate on the basis of the area information, the design constraint information, and the radio wave propagation analysis result.

A measurement system according to one embodiment of the present invention comprises: an information processing device that calculates pieces of path information for a plurality of radio waves transmitted from a transmission station and arriving at measurement points; an analysis device that sets, on the basis of the individual pieces of path information, a plurality of measurement points at which the propagation characteristics of the radio waves should be measured, and analyzes and outputs the propagation characteristics of the radio waves; and a measurement device that measures the propagation characteristics of the radio waves at the plurality of measurement points. The analysis device includes: a reflection influence calculation unit that calculates, on the basis of the individual pieces of path information calculated by the information processing device, the influences of the individual paths on the reception power at the individual measurement points; a measurement density calculation unit that divides, into a plurality of subregions, a target region for which the propagation characteristics of the radio waves are to be measured, and calculates, for each of the subregions and on the basis of the result of the calculation by the reflection influence calculation unit, the density at which measurement points are to be positioned; and an interpolation unit that performs interpolation for the propagation characteristics of the radio waves measured by the measurement device at the measurement points positioned at the density calculated by the measurement density calculation unit.

A wireless communication system includes a sensing unit that detects an obstacle currently present between a transmitting station and a receiving station. There is an environment memory that stores information on a detection result of the sensing unit, an environment prediction unit that predicts a variation in a radio wave propagation environment between the transmitting station and the receiving station from the information stored in the environment memory. There is further a simulation calculation unit that simulates an environment in which a communication path between the receiving station and a reflector and a communication path between the transmitting station and the reflector are a line-of-sight environment on the basis of a prediction result of the environment prediction unit and calculates a control parameter of the reflector that achieves the environment. Further, a reflector control unit controls the reflector in accordance with the control parameter calculated by the simulation calculation unit.

A data transmission device includes a wireless communication unit that wirelessly communicates with an external communication device, a travel route information acquirer that acquires a future travel route of a moving object, a travel route, a propagation environment information acquirer that acquires propagation environment information of a radio wave propagation path used in wireless communication, a speed information acquisition unit that acquires the moving speed of a moving object, and a converter that converts a relationship between the travel route and propagation environment information into a plurality of data slots each defined by the communication speed per unit time; a transmission instructor that instructs the wireless communication unit to transmit the data allocated to the data slot.

This invention provides an information processing device and a model modification method that improve the accuracy and reliability of radio wave propagation models. [Solution] The method involves acquiring a radio wave propagation model having a radio wave propagation area in a virtual space and objects within the area having predetermined radio wave propagation characteristics, acquiring radio wave propagation path information and reception level information for each receiving point in the model based on the simulation results of radio wave propagation, acquiring radio wave direction of arrival information and reception level information for each actual measurement candidate position in real space corresponding to the receiving point, deriving the difference between the reception level at the first receiving point and the reception level at the corresponding first actual measurement candidate position, extracting the second receiving point with the largest difference among the first receiving points, deriving the first direction of arrival received at the second actual measurement candidate position with the maximum reception level based on the direction of arrival information at the corresponding second actual measurement candidate position, extracting the first path that has a direction close to the first direction of arrival among the paths passing through the second receiving point, and correcting the radio wave propagation characteristics of objects on the first path.

This system provides an optimization method that can expand service area coverage, which is affected by terrain-related interference such as radio wave blockage and diffraction losses, while also reducing the computational load required for that optimization. [Solution] For each of the multiple candidate locations in the sky where multiple aerial PFs can be placed, the system acquires data on the radio wave propagation characteristics of the radio wave propagation path between the candidate location and the service area, based on the geographical characteristics of the service area. Based on the radio wave propagation characteristics data, it determines the locations of the multiple aerial PFs that will form cells toward the service area, or both the number and locations of the multiple aerial PFs. Based on the radio wave propagation characteristics data, it determines the values ​​of the beam parameters to be used to form cells for the multiple aerial PFs.

The purpose of the present invention is to provide a technology for appropriately estimating or evaluating radio wave reception intensity without requiring a large number of man-hours in an area where there are a large number of shielding and reflecting objects.　To this end, a radio wave propagation evaluation device according to the present invention includes a means for creating, using a first computer simulation, first model terrain data with which statistical properties substantially matching those of the sample measured values are obtained, the sample measured values indicating the relationship between a reception position and reception power in an evaluation area. The device may further include: a means for adding a dynamic object to the first model terrain data to create second model terrain data; and a means for outputting radio wave reception intensity in the evaluation area by performing a second computer simulation using the second model terrain data.

A radio transmission system of which the radio-wave propagation environment is improved is provided. A radio transmission system comprises a base station configured to perform radio communication in a frequency band within a range of 1 GHz or higher and 300 GHz or lower; a first reflector configured to reflect a direct wave emitted from the base station; and a second reflector configured to reflect an electromagnetic wave reflected by the first reflector, wherein when a maximum gain of a transmitting antenna of the base station is 5 dBi or higher and 30 dBi or lower, a sum total of a first straight-line distance D1 from the base station to the first reflector and a second straight-line distance D2 from the first reflector to the second reflector is 2.5 m or longer and 250.0 m or shorter.

Millimeter wave band communication device, including: a substrate (2); a high-frequency circuit element (4) provided on the substrate (2) for a millimeter wave band; and a cover (1) made of a solid material, covering at least part of the high-frequency circuit element (4) and a surface of the substrate (2), wherein the cover (1) is formed by mixing a material with dielectric loss into a base material, characterized by a high-frequency line (3) provided on the substrate surface and connected to the high-frequency circuit element (4) and at its opposite end to an antenna (9); and a groove structure (8) which is formed in the cover (1) in such a way as to prevent contact between the radio frequency line (3) and the cover (1), and whose width at a cross-section which intersects with a radio wave propagation direction of the radio frequency line (3) is less than or equal to a wavelength λ of a millimeter wave operating frequency of the millimeter wave band communication device.

This enables the imaging of objects that may exist in areas beyond the line of sight. [Solution] The system includes: a geometry information acquisition unit that acquires geometry information representing the environment of an imaging target area which is a non-line-of-sight region; a propagation characteristics calculation unit that calculates radio wave propagation characteristics in the environment of the imaging target area using the geometry information and the observation conditions of an observation device that performs observations using radio waves; an observation result acquisition unit that acquires observation results from an observation device; and an imaging processing unit that performs imaging processing to generate an image of the non-line-of-sight region using the radio wave propagation characteristics calculated by the propagation characteristics calculation unit and the observation results from the observation device.

A control signal used for selecting a parent node in a tree route is transmitted from a first wireless node among a plurality of wireless nodes which constitute a backhaul network. Second wireless nodes each select, as a parent node, one of transmission source nodes of a plurality of control signals on the basis of an index indicating the radio wave propagation quality of a route through which each of the control signals received from different route has been propagated. Fixed wireless nodes among the second wireless nodes each transmit the received control signal to the other second wireless nodes, and a movable wireless node among the second wireless nodes terminates the received control signal.

A device according to one aspect is provided with an acquisition unit for acquiring an input data set including an outer shape diagram indicating the outer shape of a floor plan and information indicating an installation position of a wireless communication device within the outer shape diagram, and a generation unit for outputting a floor plan diagram having the same outer shape as the outer shape of the floor plan and having an excellent radio wave propagation characteristic, by inputting the input data set to an AI model trained through machine learning using a training data set including a training floor plan diagram having an excellent radio wave propagation characteristic and information indicating an installation position of the wireless communication device within the training floor plan diagram.

To provide an information processing system and a program for generating space layout data used for radio wave propagation estimation on the basis of space feature data in a building.SOLUTION: In the information processing system 10, the program causes the information processing apparatus 100, which is a computer, to function as an acquisition unit that acquires space feature data indicating a feature of a space in a building, and a layout data generation unit that generates space layout data of a space used for radio wave propagation estimation on the basis of the space feature data.SELECTED DRAWING: Figure 1

Provided is an information processing device 1 including a control unit, a communication unit, and a storage unit, wherein the control unit executes an operation including acquiring time-series data of a backscatter coefficient on the basis of data measured by the synthetic aperture radar of an artificial satellite 3 that transmits radio waves to a geographical region, determining the occurrence state of fallen leaves of plants on the basis of the time-series data, and outputting information relating to the occurrence state.

To provide a high-quality on-vehicle window glass causing less change in gain between when the window glass is a unit and when the window glass is attached to a vehicle body.SOLUTION: An on-vehicle window glass attached to a vehicle body includes: a communication antenna disposed on an upper side located above or a lower side located below a test region A determined by safety standards of road transport vehicles in the on-vehicle window glass; and a pair of radio wave propagation inhibition member on left and right sides of the communication antenna.SELECTED DRAWING: Figure 1