34 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.

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.

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 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.

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 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

The present invention provides an information processing device that can efficiently determine candidate locations for radio wave propagation models that can be improved using measurement results, while reducing the number of candidate locations for actual measurement of radio waves in real space. [Solution] An information processing device equipped with a processor, the processor acquires a radio wave propagation model having a radio wave propagation area which is a virtual space in which radio waves propagate, and objects placed in the area having predetermined radio wave propagation characteristics, performs a simulation of radio wave propagation using the model, and determines candidate measurement locations in real space for acquiring measured values ​​to be used to modify the characteristics of the radio wave propagation model based on the simulation results.

To provide a versatile power transmission system and power transmission equipment. [Solution] The power transmission system 100 includes a power transmission unit 101 that transmits AC power of multiple frequencies to which a bias voltage is applied as power transmission radio waves; a power transmission side radio wave lens 1016 and a power receiving side radio wave lens 1021 formed of a conductive medium whose radio wave propagation speed is different from that of the atmosphere or outer space, and which output transmitted waves from the medium at a transmission angle different from the incident angle of the incident wave; and a power receiving unit 102 that receives power transmission radio waves transmitted through the power transmission side radio wave lens 1016 and focused by the power receiving side radio wave lens 1021.

A radio wave visualization system according to an embodiment includes: a model creation unit that creates a three-dimensional scale model of an environment including a terrain and a building of an area to be evaluated for a propagation characteristic of radio waves used for a wireless communication system in which a base station and a terminal station perform wireless communication via a RIS reflector; an evaluation condition creation unit that creates a plurality of evaluation conditions used for evaluating the propagation characteristic of radio waves for the target area on the basis of performance of the wireless communication system; and a RIS simulation unit that simulates and adds a reflection characteristic of the RIS reflector to the three-dimensional scale model created by the model creation unit on the basis of each of the plurality of evaluation conditions created by the evaluation condition creation unit.

To provide an electromagnetic wave reflecting device, an electromagnetic wave reflecting fence, and a radio transmission system capable of improving a radio wave propagation environment and securing the strength of the electromagnetic wave reflecting device.SOLUTION: The electromagnetic-wave reflecting device includes an electromagnetic-wave reflecting panel for reflecting electromagnetic waves in a predetermined band selected from 1MHz or more and 300GHz or less, and a frame for holding the electromagnetic-wave reflecting panel, and has strength adapted to a test based on a pendulum test of ISO14120.SELECTED DRAWING: Figure 1A

The system according to the embodiment aims to accurately simulate the radio wave conditions of wireless communication equipment. [Solution] A system according to an embodiment includes a receiving unit, an identifying unit, a simulation unit, and a providing unit. The receiving unit receives input of an address or latitude and longitude. The identifying unit identifies the location of existing wireless communication equipment based on the information received by the receiving unit. The simulation unit performs a simulation using a radio wave propagation model based on the location information identified by the identifying unit. The providing unit visually provides the simulation results obtained by the simulation unit.

A radio wave propagation simulation system is constituted with a computer including an arithmetic device that executes predetermined arithmetic processing and a storage device connected to the arithmetic device, and includes a model generation unit which generates a radio wave propagation model by the arithmetic processing of the arithmetic device, and the model generation unit generates a plurality of planes that simulate one surface of a structure, defines, as an attribute of each of the planes to be generated, a unit normal vector representing an orientation of each of the planes and generates a radio wave propagation model constituted with the generated planes.

An information processing system includes: a first ray tracing unit configured to determine a two-dimensional ray trace from a transmission point at which a radio wave is transmitted, to a reception point at which the radio wave is received; a second ray tracing unit configured to determine a three-dimensional ray trace corresponding to the two-dimensional ray trace, using height information about the transmission point and the reception point; and a radio field intensity calculation unit that calculates the intensity of the radio wave at the reception point, using one or more three-dimensional ray traces determined by the second ray tracing unit.

Provided is an information processing system comprising an acquisition unit that acquires spatial feature data indicating a feature of a space in a building, and a layout data generation unit that, on the basis of the spatial feature data, generates space layout data of the space to be used to estimate radio propagation. Also provided is a program for causing a computer to function as an acquisition unit that acquires spatial feature data indicating a feature of a space in a building, and a layout data generation unit that, on the basis of the spatial feature data, generates space layout data of the space to be used to estimate radio propagation.

To provide a radio wave propagation estimation device and a radio wave propagation estimation method that can achieve highly accurate estimation of propagation characteristics, on the premise of the use of reflected waves, or the use of a high gain antenna on the receiving side.SOLUTION: A radio wave propagation estimation device includes: a first propagation characteristic estimation unit that is connected to a wireless communication device including a radio wave receiving unit 30 and estimates propagation characteristics of a radio wave based on the reception state of the radio wave; and a second propagation characteristic estimation unit that estimates propagation characteristics of a radio wave in cyberspace that virtually reproduces a radio wave propagation environment using the propagation characteristics estimated by the first propagation characteristic estimation unit. The second propagation characteristic estimation unit outputs the estimated propagation characteristics to the wireless communication device or an external device.SELECTED DRAWING: Figure 1

The invention relates to the field of civil engineering intelligent monitoring and Internet of Things application, and particularly discloses a high-fill foundation construction communication monitoring system based on the Internet of Things. The system comprises a distributed sensing node array, a wireless communication network, a rock-soil-channel coupling analysis server, a routing dynamic optimization unit and a remote monitoring center, the sensing nodes are buried in different depths of a foundation to collect settlement, displacement, soil pressure and moisture content data, the wireless network synchronously records signal strength and uploads physical layer characteristics, the rock-soil-channel coupling analysis server fuses rock-soil parameters and a radio wave propagation model, constructs a four-dimensional coupling relation between soil body characteristics and signal attenuation, and transmits the four-dimensional coupling relation to the ground. And the route dynamic optimization unit prejudges a communication blind area and adjusts a forwarding path according to the communication blind area, and the remote monitoring center realizes state visualization and construction decision support. According to the invention, the deep fusion of monitoring and communication is realized, the sensing capability can still be maintained when the sensor part fails, and the continuity and reliability of data transmission in a complex construction environment are ensured.

An object of the present disclosure is to provide a method of automatically setting an input parameter capable of suppressing an increase in calculation time at the time of ray trace calculation.SOLUTION: A parameter setting processing device 10 includes a determination part 15 for evaluating a contribution degree to one or a plurality of objective functions of one or a plurality of parameters contributing to propagation path calculation of a radio wave emitted from a transmission part and reaching a reception part, and a GA calculation part 13 for setting the one or the plurality of parameters using a genetic algorithm on the basis of an evaluation result of the determination part 15.SELECTED DRAWING: Figure 1

The system allows for real-time monitoring of precipitation conditions in the propagation path between opposing radios while transmitting and receiving signals, enabling adjustment of the frequency bandwidth. [Solution] In a wireless communication system according to one embodiment of the present invention, the master station a stores a portion of the transmission signal to the slave station b as a known signal in memory 17a, the correlation calculation unit 19a performs a correlation calculation between the reflected signal reflected in the propagation path 30 between the transmission signal and the slave station b and the known signal in memory 17a, the precipitation estimation unit 20a estimates the precipitation conditions in the propagation path 30 based on the results of the correlation calculation, and the communication parameter control unit 21a changes the frequency bandwidth according to the estimated result of the precipitation conditions in the propagation path 30.

A base station allocation support apparatus includes a first calculation unit that calculates radio wave propagation attenuation values between a plurality of wireless terminals in a certain area based on position information of each of the plurality of wireless terminals and information indicating a layout of the area, a clustering unit that performs clustering on the plurality of wireless terminals based on the radio wave propagation attenuation values; and a determination unit that determines an arrangement position of a wireless base station with respect to the wireless terminals based on a result of the clustering.

The technologies described herein are generally directed to modeling radio wave propagation in a fifth generation (5G) network or other next generation networks. For example, a method described herein can include, for a network application, identifying, by a system comprising a processor, a characteristic value of a performance characteristic associated with an uplink connection enabled via a network of a user equipment to application server equipment hosting the network application. The method can further include, based on the characteristic value and a criterion, selecting, by the system, a first packet size for the uplink connection. The method can further include communicating, by the system, to the user equipment, the first packet size for use with the uplink connection.

A method for creating a radio wave propagation model (M2) for performing radio wave propagation analysis of a target structure, said method comprising: an acquisition step (S1) of acquiring a three-dimensional model (M1) of the target structure; a determination step (S2) of determining RCS in the three-dimensional model (M1); and a radio wave propagation model creation step (S3) of creating a radio wave propagation model (M2) by removing a portion where RCS is equal to or less than a threshold value from the three-dimensional model (M1).

[Object] To provide a communication control apparatus that can prevent radio waves of a certain communication apparatus from interfering with radio waves of another communication apparatus or reduce the interference in a wireless communication system in which the radio wave propagation controlling apparatus can be used, where the certain communication apparatus and the other communication apparatus use one wireless communication resource.[Solving Means] A communication control apparatus includes a first calculator that calculates a distance and a direction between a first communication apparatus and a second communication apparatus on the basis of position information regarding a position of the first communication apparatus and position information regarding a position of the second communication apparatus; a second calculator that calculates characteristics regarding radio wave propagation between the first communication apparatus and the second communication apparatus on the basis of the distance between the first communication apparatus and the second communication apparatus, the direction between the first communication apparatus and the second communication apparatus, position information regarding a position of a radio wave propagation controlling apparatus, and characteristic information regarding characteristics of the radio wave propagation controlling apparatus; and a first determination section that determines an operational parameter for the radio wave propagation controlling apparatus on the basis of the characteristics regarding the radio wave propagation between the first communication apparatus and the second communication apparatus.

The present disclosure relates to a wireless space design device, a wireless space design method, a wireless space design device, and a wireless space design program. This wireless space design device is configured to execute: a process in which an information acquisition score that indicates an information acquisition performance is calculated on the basis of a spatial model and a sensor position pattern candidate; a process in which a process for calculating radio wave propagation scores for the spatial model and a plurality of base station position candidates is repeated for all sensor position pattern candidates, and the maximum value of the radio wave propagation scores for each of a plurality of sensor position pattern candidates is calculated; a process in which composite scores are calculated on the basis of information acquisition scores and the maximum values; a process in which, out of all of the composite scores, a prescribed number of composite scores are extracted in order of highest value; and a process in which the base station positions and the sensor position patterns corresponding to the extracted composite scores are output as the base station positions and the sensor position patterns that apply to a base station design.