System, Information Processing Apparatus, Program, and Method

Abstract

A system is provided that includes a first antenna device having a radio wave radiation unit that radiates radio waves in the terahertz band or the high SHF band, a radio wave reception unit, a reflection unit that reflects radio waves from the outside and has a plate-like shape, and an angle change unit that changes the rotation angle of the reflection unit when the reflection unit reflects radio waves from the outside by rotating the reflection unit with respect to the radio wave reception unit. The system also includes an acquisition unit that acquires a plurality of measurement data measured by the second antenna device receiving the radio waves radiated by the first antenna device at a plurality of measurement angles of the reflection unit, and a determination unit that determines, based on the plurality of measurement data, the radio waves received by the second antenna device when the rotation angle of the reflection unit is a target rotation angle that is not included in the plurality of measurement angles and the radio waves are radiated by the first antenna device.

Description

Technical Field

[0001] The present invention relates to a system, an information processing apparatus, a program, and a method.

Background Art

[0002] Patent Document 1 describes a technique for specifying a combination of an emission direction and a reception directivity of radio waves in the terahertz wave band. Patent Document 2 describes a technique for changing the polarization of radio waves according to adjustment of a reflection part of an antenna device. Patent Document 3 describes an antenna device configured such that, in a reflector type antenna device that performs azimuth scanning with a rotation drive device, an electrical movable contact is eliminated and a primary radiator does not shield a radio wave path between a reflector and free space. Non-Patent Document 1 describes a technique for applying a synthetic aperture type arrival direction measurement method to a measurement method using a rotating reflector. [Prior Art Documents] [Patent Documents] [Patent Document 1] Japanese Patent No. 7246537 [Patent Document 2] Patent No. 7301911 [Patent Document 3] Japanese Unexamined Patent Application Publication No. 2007-251664 [Non-Patent Documents] "Non-Patent Document 1": Yamaguchi, Ryo; Toyomoto, Kazuma, "Examination of Synthetic Aperture Type Arrival Direction Measurement Method Using a Rotating Reflector - Concave Arc Virtual Array Synthesis Beam Generation Method by Primary Radiator Mirror Image -", Institute of Electronics, Information and Communication Engineers, December 2020, pp. 29-32

Summary of the Invention

Means for Solving the Problems

[0003] According to an embodiment of the present invention, a system is provided. The system may include a first antenna device having a radio wave radiating unit that radiates radio waves in the terahertz band or the high SHF (Super High Frequency) band. The system may include a second antenna device having a radio wave receiving unit, a reflecting unit that reflects radio waves from the outside and has a plate-like shape, and an angle changing unit that changes the rotation angle of the reflecting unit when the reflecting unit reflects radio waves from the outside by rotating the reflecting unit with respect to the radio wave receiving unit. The system may include an information processing device having an acquisition unit that acquires a plurality of measurement data measured by the second antenna device receiving radio waves reflected by the reflecting unit at a plurality of measurement angles when the second antenna device reflects radio waves radiated by the first antenna device, and a determination unit that determines radio waves received by the second antenna device when the radio waves radiated by the first antenna device and the rotation angle of the reflecting unit are a target rotation angle not included in the plurality of measurement angles based on the plurality of measurement data.

[0004] In the system, the radio wave radiating unit may radiate radio waves in a state where the position and angle are fixed while the second antenna device is receiving radio waves.

[0005] In any of the systems, the determination unit may determine radio waves received by the second antenna device when the radio waves radiated by the first antenna device and the rotation angle of the reflecting unit are the target rotation angle based on radio waves when radio waves received by the second antenna device when the rotation angle of the reflecting unit is each measurement angle among the plurality of measurement angles are combined.

[0006] In any of the above systems, the determination unit may determine the radio wave radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflection unit is the target rotation angle, by performing synthetic aperture processing based on the plurality of measurement data, and regarding the radio wave reflected by the reflection unit and received by the radio wave receiving unit as the radio wave received by a virtual antenna located at a position symmetric to the position of the radio wave receiving unit with respect to the reflection unit.

[0007] In any of the above systems, the determination unit may perform the synthetic aperture processing using the following mathematical formula.

[0008]

Equation

[0009]

Equation

[0010] In any of the above systems, the angle changing unit may rotate and move the reflection part one or more times with respect to the radio wave receiving unit. The information processing device may select, from a plurality of measurement data measured by receiving the radio wave radiated by the first antenna device when the second antenna device rotates and moves the reflection part one or more times with respect to the radio wave receiving unit, the plurality of measurement data used to determine the radio wave received by the second antenna device when the radio wave is radiated by the first antenna device and the rotation angle of the reflection part is the target rotation angle. The determination unit may determine the radio wave received by the second antenna device when the radio wave is radiated by the first antenna device and the rotation angle of the reflection part is the target rotation angle based on the plurality of measurement data selected by the selection unit.

[0011] In any of the above systems, the angle changing unit may rotate and move the reflection part with respect to the radio wave receiving unit so that the reflection part reflects the radio wave radiated by the first antenna device at a plurality of measurement angles at a predetermined first angle interval. The determination unit may determine the radio wave received by the second antenna device when the radio wave is radiated by the first antenna device and the rotation angle of the reflection part is each target rotation angle at a plurality of target rotation angles at a predetermined second angle interval.

[0012] In any of the above systems, the second angle interval may be an angle interval shorter than the first angle interval.

[0013] In any of the above systems, the determination unit may determine the rotation angle of the reflection unit when the radio wave radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflection unit is each measurement angle of the plurality of measurement angles, and the radio wave radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflection unit is each target rotation angle of the plurality of target rotation angles, and determine the rotation angle of the reflection unit when the radio wave radiated by the first antenna device arrives at the second antenna device with the maximum electric field strength.

[0014] According to an embodiment of the present invention, an information processing apparatus is provided. The information processing apparatus includes a radio wave receiving unit, a reflection unit that reflects radio waves from the outside and has a plate-like shape, and an angle changing unit that changes the rotation angle of the reflection unit when the reflection unit reflects radio waves from the outside by rotating the reflection unit with respect to the radio wave receiving unit. The second antenna device may include an acquisition unit that acquires a plurality of measurement data measured by reflecting and receiving radio waves in the terahertz wave band or the high SHF band radiated by the radio wave radiating unit of the first antenna device at the reflection unit at a plurality of measurement angles. The information processing apparatus may include a determination unit that determines a radio wave received by the second antenna device when the radio wave radiated by the first antenna device and the rotation angle of the reflection unit are target rotation angles not included in the plurality of measurement angles based on the plurality of measurement data.

[0015] According to one embodiment of the present invention, a computer has a radio wave receiving unit, a reflecting unit that reflects radio waves from the outside and has a plate-like shape, and an angle changing unit that changes the rotation angle of the reflecting unit when the reflecting unit reflects radio waves from the outside by rotating the reflecting unit relative to the radio wave receiving unit. A second antenna device is provided with a program for executing an acquisition procedure for acquiring a plurality of measurement data measured by reflecting and receiving radio waves in a terahertz wave band or a high SHF band radiated by a radio wave radiating unit of a first antenna device at the reflecting unit at a plurality of measurement angles, and a determination procedure for determining radio waves received by the second antenna device when the rotation angle of the reflecting unit is a target rotation angle not included in the plurality of measurement angles and radiated by the first antenna device based on the plurality of measurement data.

[0016] According to one embodiment of the present invention, there is provided a method executed by a system including a first antenna device having a radio wave radiating unit that radiates radio waves in a terahertz wave band or a high SHF band, a second antenna device having a radio wave receiving unit, a reflecting unit that reflects radio waves from the outside and has a plate-like shape, and an angle changing unit that changes the rotation angle of the reflecting unit when the reflecting unit reflects radio waves from the outside by rotating the reflecting unit relative to the radio wave receiving unit, and an information processing device. The method may include a receiving step in which the second antenna device reflects and receives radio waves radiated by the first antenna device at the reflecting unit at a plurality of measurement angles. The method may include an acquisition step in which the information processing device acquires a plurality of measurement data measured by reflecting and receiving radio waves radiated by the first antenna device at the reflecting unit at the plurality of measurement angles in the receiving step. The method may include a determination step in which the information processing device determines radio waves received by the second antenna device when the rotation angle of the reflecting unit is a target rotation angle not included in the plurality of measurement angles and radiated by the first antenna device based on the plurality of measurement data acquired in the acquisition step.

[0017] Furthermore, the above summary of the invention does not enumerate all of the necessary features of the present invention. Also, sub - combinations of these groups of features may also be inventions.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0019] The applicant has developed a so-called "rotating reflector antenna" that fixes a primary radiator and rotates a parabolic reflector. The rotating reflector antenna has a mechanism that can rotate the reflector at high speed infinitely, and it is possible to realize high-speed directional scanning using the rotating reflector antenna. However, when detecting the arrival direction of the beam in detail, the measurement angular interval of the rotating reflector antenna must be made finer. As a result, the measurement speed decreases. Also, when narrowing the beam width of the beam, a large-aperture parabolic antenna must be prepared, and due to the processing limit of the processing machine, it may not be possible to create a large-aperture parabolic antenna. In the system according to this embodiment, for example, a mechanism is adopted in which the primary radiator is fixed, a planar reflector is rotated to measure the beam, and then synthetic aperture processing using the measurement data is executed offline.

[0020] Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims. Also, not all combinations of features described in the embodiments are essential for the solution means of the invention.

[0021] FIG. 1 schematically shows an example of the system 10. The system 10 may include an antenna device 100. The system 10 may include an antenna device 200. The system 10 may include an information processing device 300. The system 10 may include an angle controller 400. The system 10 may include a VNA 500.

[0022] The antenna device 100 is an antenna device that radiates radio waves. The antenna device 100 may have, for example, a radio wave radiation unit. The antenna device 100 may be an example of a first antenna device.

[0023] The radio wave radiation unit radiates radio waves. The radio wave radiation unit radiates radio waves, for example, by radiating a beam. The radio wave radiation unit is an antenna capable of radiating radio waves of orthogonal polarization.

[0024] The radio wave radiating unit radiates radio waves in, for example, the terahertz wave band. The radio waves in the terahertz wave band may be radio waves in a frequency band from 100 GHz to 10 THz.

[0025] The radio wave radiating unit may radiate radio waves in the high SHF band. The radio waves in the high SHF band may be radio waves in a frequency band from 6 GHz to 30 GHz.

[0026] The antenna device 200 is an antenna device that receives radio waves. The antenna device 200 has, for example, a reflection unit 202, a radio wave receiving unit 204, a support unit 206, and an angle changing unit 208. The antenna device 200 may be an example of a second antenna device. The radio wave radiating unit of the antenna device 100 may radiate radio waves in a state where the position and angle are fixed while the antenna device 200 is receiving radio waves.

[0027] The reflection unit 202 reflects radio waves from the outside. The reflection unit 202 reflects, for example, the radio waves radiated by the antenna device 100.

[0028] The reflection unit 202 has, for example, a plate-like shape. The reflection unit 202 has, for example, a flat reflection surface for reflecting radio waves. The reflection unit 202 is, for example, a plane reflector.

[0029] The reflection unit 202 may be any member as long as it can reflect radio waves. The reflection unit 202 is, for example, a mirror. The reflection unit 202 is, for example, a plane mirror.

[0030] The radio wave receiving unit 204 receives radio waves. The radio wave receiving unit 204 receives, for example, the radio waves reflected by the reflection unit 202. The radio wave receiving unit 204 is, for example, an antenna capable of receiving radio waves of orthogonal polarization.

[0031] The support unit 206 supports the reflection unit 202. The reflection unit 202 and the support unit 206 may be integrated or may be different members.

[0032] The angle changing unit 208 rotates and moves the reflecting unit 202. The angle changing unit 208 is, for example, a turntable.

[0033] The angle changing unit 208 changes the rotation angle of the reflecting unit 202 when the reflecting unit 202 reflects radio waves from the outside, for example, by rotating and moving the reflecting unit 202 with respect to the radio wave receiving unit 204. The angle changing unit 208 rotates and moves the reflecting unit 202 with respect to the radio wave receiving unit 204 so that the reflecting unit 202 reflects the radio waves radiated by the antenna device 100 at a plurality of rotation angles (which may be described as measurement angles) at a predetermined angular interval.

[0034] The angular interval between the plurality of measurement angles of the reflecting unit 202 may be described as AS (Angular Space). AS is, for example, 2°.

[0035] The angle changing unit 208 rotates and moves the reflecting unit 202 with respect to the radio wave receiving unit 204 by one or more rotations, for example. For example, when the angle changing unit 208 rotates and moves the reflecting unit 202 with respect to the radio wave receiving unit 204 by only one rotation so that the reflecting unit 202 reflects the radio waves radiated by the antenna device 100 at 2° intervals, the reflecting unit 202 reflects the radio waves radiated by the antenna device 100 at 180 measurement angles. The angle changing unit 208 may rotate and move the reflecting unit 202 with respect to the radio wave receiving unit 204 by less than one rotation.

[0036] The angle changing unit 208 rotates about a rotation axis, for example. The rotation axis may be perpendicular to the installation surface of the angle changing unit 208 where the support unit 206 is installed.

[0037] The angle changing unit 208 rotates counterclockwise about the rotation axis, for example. The angle changing unit 208 may rotate clockwise about the rotation axis.

[0038] The radio wave receiving unit 204 is installed in the antenna device 200 so that, for example, its position and angle are fixed. The radio wave receiving unit 204 is installed in the antenna device 200 so that, for example, the central axis of the radio wave receiving unit 204 perpendicular to the installation surface of the angle changing unit 208 coincides with the rotation axis of the angle changing unit 208.

[0039] The support unit 206 is installed on the installation surface of the angle changing unit 208 so that, for example, the support unit 206 is perpendicular to the installation surface of the angle changing unit 208. The support unit 206 supports the reflecting unit 202 so that, for example, the elevation angle of the reflecting unit 202 with respect to the installation surface of the angle changing unit 208 is 45°.

[0040] The information processing device 300 executes various information processes. The information processing device 300 executes, for example, a process for determining the arrival direction of radio waves when the radio waves radiated by the antenna device 100 arrive at the antenna device 200 appropriately.

[0041] The information processing device 300 executes various information processes in cooperation with, for example, the angle controller 400. The information processing device 300 executes various information processes in cooperation with, for example, the VNA (Vector Network Analyzer) 500.

[0042] The angle controller 400 controls the rotation angle of the angle changing unit 208. Note that controlling the rotation angle of the angle changing unit 208 may mean controlling the rotation angle of the reflecting unit 202. The angle changing unit 208 may rotate the reflecting unit 202 relative to the radio wave receiving unit 204 according to the control by the angle controller 400.

[0043] The angle controller 400 transmits, for example, angle data indicating the rotation angle of the reflecting unit 202 when the reflecting unit 202 reflects radio waves from the outside to the information processing device 300. The angle controller 400 transmits the angle data to the information processing device 300 via, for example, a wired connection. The angle controller 400 may transmit the angle data to the information processing device 300 via a wireless connection.

[0044] The information processing device 300 may have the function of the angle controller 400. The information processing device 300 and the angle controller 400 may be integrated. For example, the information processing device 300 may incorporate the angle controller 400.

[0045] The VNA 500 measures the electric field strength of the radio wave received by the antenna device 200. The VNA 500 measures, for example, the electric field strength of the radio wave when the antenna device 200 receives the radio wave radiated by the antenna device 100 at the measurement angle of one reflection part 202. The VNA 500 measures, for example, the electric field strength of the radio wave when the antenna device 200 receives the radio wave radiated by the antenna device 100 at a plurality of measurement angles of the reflection part 202.

[0046] The VNA 500 has, for example, two terminals for measuring the electric field strength of the radio wave. In an example shown in FIG. 1, the VNA 500 measures the electric field strength of the radio wave with two terminals, terminal 1 and terminal 2.

[0047] The VNA 500 starts measuring the electric field strength of the radio wave when the antenna device 200 receives the radio wave, for example, in response to receiving a trigger input from the angle controller 400. In this case, the VNA 500 may start measuring the electric field strength of the radio wave when the antenna device 200 receives the radio wave by causing the antenna device 100 to radiate the radio wave.

[0048] The VNA 500 receives a trigger input from the angle controller 400 via a wired connection, for example. The VNA 500 may receive a trigger input from the angle controller 400 via a wireless connection.

[0049] The VNA 500 transmits the measurement data of the electric field strength of the radio wave measured by the antenna device 200 to the information processing device 300, for example. The VNA 500 transmits the measurement data to the information processing device 300 via a wired connection, for example. The VNA 500 may transmit the measurement data to the information processing device 300 via a wireless connection.

[0050] The VNA500 may be replaced with any device capable of measuring the electric field strength of the radio wave received by the antenna device 200. The VNA500 may be replaced with, for example, a spectrum analyzer and a signal generator.

[0051] The information processing device 300 may have the functions of the VNA500. The information processing device 300 and the VNA500 may be integrated. For example, the information processing device 300 may incorporate the VNA500.

[0052] The information processing device 300 acquires, for example, measurement data measured by the antenna device 200 receiving the radio wave radiated by the antenna device 100 at the measurement angle of one reflection unit 202. The information processing device 300 acquires, for example, a plurality of measurement data measured by the antenna device 200 receiving the radio wave radiated by the antenna device 100 at a plurality of measurement angles of the reflection unit 202.

[0053] The information processing device 300 acquires measurement data from the VNA500, for example. The information processing device 300 acquires angle data corresponding to the measurement data from the angle controller 400, for example.

[0054] The information processing device 300 executes a base conversion on the measurement data, for example. The information processing device 300 executes a base conversion on the measurement data based on the angle data corresponding to the measurement data, for example.

[0055] The information processing apparatus 300 may regard the radio wave reflected by the reflection unit 202 and received by the radio wave receiving unit 204 as the radio wave received by the virtual antenna 250 located at a position symmetric to the position of the radio wave receiving unit 204 with respect to the reflection unit 202. For example, when the angle changing unit 208 rotates and moves the reflection unit 202 one or more times with respect to the radio wave receiving unit 204 so that the reflection unit 202 reflects the radio wave radiated by the antenna device 100 at a plurality of measurement angles, the information processing apparatus 300 may regard the radio wave reflected by the reflection unit 202 and received by the radio wave receiving unit 204 as the radio wave received by the virtual antenna 250 located at each of the plurality of black circles shown around the reflection unit 202 in FIG. 1.

[0056] The information processing apparatus 300 may regard the radio wave reflected by the reflection unit 202 and received by the radio wave receiving unit 204 as the radio wave received by the virtual array 270 composed of a plurality of virtual antennas 250. For example, when the angle changing unit 208 rotates and moves the reflection unit 202 one or more times with respect to the radio wave receiving unit 204 so that the reflection unit 202 reflects the radio wave radiated by the antenna device 100 at a plurality of measurement angles, the information processing apparatus 300 may select a plurality of virtual antennas 250 constituting the virtual array 270.

[0057] The information processing apparatus 300 determines, for example, the radio wave received by the antenna device 200 when the radio wave radiated by the antenna device 100 and the rotation angle of the reflection unit 202 is the target rotation angle not included in the plurality of measurement angles, based on a plurality of measurement data measured by the antenna device 200 receiving the radio wave radiated by the antenna device 100 at a plurality of measurement angles of the reflection unit 202. The information processing apparatus 300 determines, for example, the radio wave received by the antenna device 200 when the radio wave radiated by the antenna device 100 and the rotation angle of the reflection unit 202 is the target rotation angle, by performing synthetic aperture processing on the opening of the radio wave receiving unit 204 based on the plurality of measurement data. Specific processing for the information processing apparatus 300 to determine the radio wave received by the antenna device 200 when the radio wave is radiated by the antenna device 100 and the rotation angle of the reflection unit 202 is the target rotation angle will be described later.

[0058] FIG. 2 schematically shows an example of the antenna device 200. Here, the relationship between the rotation angle of the reflection unit 202 and the rotation angle of the virtual antenna 250 will be mainly described.

[0059] In the example shown in FIG. 2, the angle changing unit 208 rotates about a rotation axis parallel to the z-axis. Here, the rotation direction in which the angle changing unit 208 rotates counterclockwise about the rotation axis is defined as the positive rotation direction, and the rotation direction in which the angle changing unit 208 rotates clockwise about the rotation axis is defined as the negative rotation direction.

[0060] When the angle changing unit 208 rotates and moves the reflection unit 202 relative to the radio wave receiving unit 204, the virtual antenna 250 rotates and moves. In the example shown in FIG. 2, when the angle changing unit 208 rotates and moves the reflection unit 202 by θ relative to the radio wave receiving unit 204, the virtual antenna 250 rotates and moves by θ. Therefore, θ may represent the rotation angle of the reflection unit 202 or the rotation angle of the virtual antenna 250.

[0061] In the example shown in FIG. 2, the installation surface of the angle changing unit 208 is a plane parallel to the xy plane. Also, in the example shown in FIG. 2, the support unit 206 is installed on the installation surface of the angle changing unit 208 so as to be parallel to the z-axis.

[0062] FIG. 3 is an explanatory diagram for explaining an example of the relationship between the radio wave receiving unit 204 and the virtual antenna 250. Here, the positional relationship between the radio wave receiving unit 204 and the virtual antenna 250 will be mainly described.

[0063] Since the virtual antenna 250 is located at a position symmetric to the position of the radio wave receiving unit 204 with respect to the reflection unit 202, the distance from the reflection unit 202 to the virtual antenna 250 is the same as the distance from the reflection unit 202 to the radio wave receiving unit 204. In the example shown in FIG. 3, both the distance from the reflection unit 202 to the radio wave receiving unit 204 and the distance from the reflection unit 202 to the virtual antenna 250 are R.

[0064] In addition, since the virtual antenna 250 is located at a position symmetric to the position of the radio wave receiving unit 204 with respect to the reflecting unit 202, the angle formed by the reflecting unit 202 and a straight line perpendicular to the opening surface 252 of the opening of the virtual antenna 250 is the same as the angle formed by the reflecting unit 202 and a straight line perpendicular to the opening surface 205 of the opening of the radio wave receiving unit 204. In an example shown in FIG. 3, the straight line perpendicular to the reflecting unit 202 and the opening surface 205 is a straight line parallel to the z-axis, and the straight line perpendicular to the reflecting unit 202 and the opening surface 252 is a straight line parallel to the y-axis. Also, in an example shown in FIG. 3, both the angle formed by the reflecting unit 202 and the straight line perpendicular to the opening surface 205 and the angle formed by the reflecting unit 202 and the straight line perpendicular to the opening surface 252 are 45°.

[0065] FIG. 4 is an explanatory diagram for explaining an example of the virtual array 270. Here, it is assumed that the origin of the xyz coordinate system shown in FIG. 4 is the reflection point where the reflecting unit 202 reflects the radio wave received by the radio wave receiving unit 204.

[0066] In an example shown in FIG. 4, the virtual array 270 is composed of 2N + 1 virtual antennas 250 located at each of the 2N + 1 black circles. Note that N is an integer of 0 or more.

[0067] φ is the rotation angle at the center of the rotation angles of the 2N + 1 virtual antennas 250. Therefore, among the 2N + 1 virtual antennas 250, N virtual antennas 250 have a larger θ than the virtual antenna 250 located at the black circle corresponding to θ = φ, and among the 2N + 1 virtual antennas 250, N virtual antennas 250 have a smaller θ than the virtual antenna 250 located at the black circle corresponding to θ = φ.

[0068] In an example shown in FIG. 4, among the 2N + 1 virtual antennas 250 constituting the virtual array 270, the virtual antenna 250 located at the black circle corresponding to θ = φ + θ 1 the virtual antenna 250 located at the black circle corresponding to θ = φ + θ 2 the virtual antenna 250 located at the black circle corresponding to ···, θ = φ + θ N-2 the virtual antenna 250 located at the black circle corresponding to θ = φ + θ N-1The virtual antenna 250 located at the black circle corresponding to it, and θ = φ + θ N Among the N virtual antennas 250 of the virtual antenna 250 located at the black circle corresponding to θ = φ + θ, the θ is larger than that of the virtual antenna 250 located at the black circle corresponding to θ = φ. Also, among the 2N + 1 virtual antennas 250 constituting the virtual array 270, the virtual antenna 250 located at the black circle corresponding to θ = φ + θ -1 The virtual antenna 250 located at the black circle corresponding to it, θ = φ + θ -2 The virtual antenna 250 located at the black circle corresponding to it, ···, θ = φ + θ -(N-2) The virtual antenna 250 located at the black circle corresponding to it, θ = φ + θ -(N-1) The virtual antenna 250 located at the black circle corresponding to it, and θ = φ + θ -N Among the N virtual antennas 250 of the virtual antenna 250 located at the black circle corresponding to θ = φ + θ, the θ is smaller than that of the virtual antenna 250 located at the black circle corresponding to θ = φ.

[0069] FIG. 5 is an explanatory diagram for explaining an example of the position of the virtual antenna 250. Here, it is assumed that the origin of the xyz coordinate system shown in FIG. 5 is the reflection point where the radio wave received by the radio wave receiving unit 204 is reflected by the reflecting unit 202.

[0070] The position of the virtual antenna 250 may be represented by a position vector. In an example shown in FIG. 5, for the virtual antenna 250 located at the black circle corresponding to θ = φ + θ n The position vector R representing the position of the virtual antenna 250 located at the black circle corresponding to it n is R n =(Rcos(180°+(φ + θ n )), Rsin(180°+(φ + θ n )))=(-Rcos(φ + θ n ), -Rsin(φ + θ n ))). θ n is n×AS, and n is an integer satisfying -N ≦ n ≦ N.

[0071] FIG. 6 is an explanatory diagram for explaining an example of the target rotation angle. Here, it is assumed that the origin of the xyz coordinate system shown in FIG. 6 is the reflection point where the radio wave received by the radio wave receiving unit 204 is reflected by the reflecting unit 202.

[0072] In an example shown in FIG. 6, φ + φ SC is the target rotation angle. φ SC is the offset angle, where 0° < φ SC ≦ (AS - φ step ). φ step is the step angle, where 0.1° ≦ φ step ≦ 1°. For example, if AS = 2° and φ step = 0.1°, then φ SC satisfies 0° < φ SC ≦ 1.9°.

[0073] When θ = φ + φ SC , determining the radio wave received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 may be equivalent to determining the radio wave received by the virtual antenna 250 located at the black square corresponding to θ = φ + φ SC . k sc is the wave number vector of the radio wave received by the virtual antenna 250 located at the black square corresponding to θ = φ + φ SC . In an example shown in FIG. 6, k sc is represented as k sc = (kcos(180° + (φ + φ SC )), ksin(180° + (φ + φ SC ))) = (-kcos(φ + φ SC ), -ksin(φ + φ SC )). k is the wave number of k sc .

[0074] FIG. 7 is an explanatory diagram for explaining an example of the processing flow of the system 10. Here, the start state is a state where the information processing device 300 has not acquired measurement data.

[0075] In step (steps may be abbreviated as S), in step 102, the radio wave radiating unit of the antenna device 100 radiates a radio wave. While the antenna device 100 is radiating the radio wave, the antenna device 200 receives the radio wave radiated by the antenna device 100 at a plurality of measurement angles.

[0076] For example, while the antenna device 100 is radiating radio waves, when the angle changing unit 208 rotates and moves the reflecting unit 202 by one rotation with respect to the radio wave receiving unit 204, and when AS = 2°, the antenna device 200 receives the radio waves radiated by the antenna device 100 at the measured angles of 180 reflecting units 202. For example, the radio wave receiving unit 204 receives the radio waves reflected by the reflecting unit 202 when θ = -180°, the radio waves reflected by the reflecting unit 202 when θ = -178°, the radio waves reflected by the reflecting unit 202 when θ = -176°, ···, the radio waves reflected by the reflecting unit 202 when θ = 174°, the radio waves reflected by the reflecting unit 202 when θ = 176°, and the radio waves reflected by the reflecting unit 202 when θ = 178°.

[0077] In S104, the VNA 500 measures the electric field strength of the radio waves received by the antenna device 200 while the antenna device 100 is radiating radio waves in S102. For example, the VNA 500 measures the electric field strength of the radio waves received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = -180°, the electric field strength of the radio waves received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = -178°, the electric field strength of the radio waves received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = -176°, ···, the electric field strength of the radio waves received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = 174°, the electric field strength of the radio waves received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = 176°, and the electric field strength of the radio waves received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = 178°.

[0078] In S106, the information processing apparatus 300 acquires a plurality of measurement data measured by the VNA 500 in S104 from the VNA 500. For example, the information processing apparatus 300 measures the electric field strength of the radio wave received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = -180°, the measurement data of the electric field strength of the radio wave received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = -178°, the measurement data of the electric field strength of the radio wave received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = -176°, ···, the measurement data of the electric field strength of the radio wave received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = 174°, the measurement data of the electric field strength of the radio wave received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = 176°, and the measurement data of the electric field strength of the radio wave received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = 178°. The information processing apparatus 300 acquires 180 pieces of measurement data including these.

[0079] In S108, the information processing apparatus 300 performs a base conversion process on each piece of measurement data of the plurality of measurement data acquired from the VNA 500 in S106. For example, the information processing apparatus 300 determines φ, which is the measurement angle at the center of the plurality of measurement angles of the reflecting unit 202 corresponding to the plurality of measurement data, in order to perform a base conversion process on the measurement data. Then, the information processing apparatus 300 performs a base conversion process on each piece of measurement data of the plurality of measurement data using the following mathematical formula.

[0080]

Number

[0081] E V (φ + θ n ) is the electric field strength of the vertically polarized wave component of the radio wave radiated by the antenna device 100 and received by the radio wave receiving unit 204 when the measurement angle of the reflecting unit 202 is φ + θ n . E H (φ + θ n ) is the electric field strength of the vertically polarized wave component of the radio wave radiated by the antenna device 100 and received by the radio wave receiving unit 204 when the measurement angle of the reflecting unit 202 is φ + θn is the electric field strength of the horizontally polarized wave component of the radio wave received by the radio wave receiving unit 204 when it is as follows. E Rx1 (φ + θ n ) is the electric field strength of the radio wave received by the radio wave receiving unit 204 when the radio wave is radiated by the antenna device 100 and the measurement angle of the reflecting unit 202 is φ + θ n and is the electric field strength of the radio wave measured at terminal 1 of the VNA500, which is included in the measurement data measured by the VNA500 of the electric field strength of the radio wave received by the radio wave receiving unit 204 when it is as follows. E Rx2 (φ + θ n ) is the electric field strength of the radio wave measured at terminal 2 of the VNA500, which is included in the said measurement data. θ n is n × AS.

[0082] In S110, the information processing device 300 selects a plurality of measurement data used to determine the radio wave received by the antenna device 200 when the radio wave is radiated by the antenna device 100 and the rotation angle of the reflecting unit 202 is the target rotation angle, from among the plurality of measurement data for which the base conversion process has been executed in S108. For example, the information processing device 300 selects measurement data centered on the measurement data of the electric field strength of the radio wave received by the radio wave receiving unit 204 when the radio wave is radiated by the antenna device 100 and the measurement angle of the reflecting unit 202 is φ, from among 180 pieces of measurement data for which the base conversion process has been executed.

[0083] For example, the information processing device 300 selects measurement data of the electric field strength of the radio wave received by the radio wave receiving unit 204 when the radio wave is radiated by the antenna device 100 and the measurement angle of the reflecting unit 202 is φ + θ 1 measurement data of the electric field strength of the radio wave received by the radio wave receiving unit 204 when the radio wave is radiated by the antenna device 100 and the measurement angle of the reflecting unit 202 is φ + θ 2 measurement data of the electric field strength of the radio wave received by the radio wave receiving unit 204 when the radio wave is radiated by the antenna device 100 and the measurement angle of the reflecting unit 202 is φ + θ N-2 measurement data of the electric field strength of the radio wave received by the radio wave receiving unit 204 when the radio wave is radiated by the antenna device 100 and the measurement angle of the reflecting unit 202 is φ + θ N-1Measurement data obtained by measuring the electric field strength of the radio wave received by the radio wave receiving unit 204 when it is as described, and the radio wave radiated by the antenna device 100 and the measurement angle of the reflection unit 202 is φ + θ N Select N pieces of measurement data including the measurement data obtained by measuring the electric field strength of the radio wave received by the radio wave receiving unit 204 when it is as described. Further, the information processing device 300 is the radio wave radiated by the antenna device 100 and the measurement angle of the reflection unit 202 is φ + θ -1 Measurement data obtained by measuring the electric field strength of the radio wave received by the radio wave receiving unit 204 when it is as described, the radio wave radiated by the antenna device 100 and the measurement angle of the reflection unit 202 is φ + θ -2 Measurement data obtained by measuring the electric field strength of the radio wave received by the radio wave receiving unit 204 when it is as described, ···, the radio wave radiated by the antenna device 100 and the measurement angle of the reflection unit 202 is φ + θ -(N-2) Measurement data obtained by measuring the electric field strength of the radio wave received by the radio wave receiving unit 204 when it is as described, the radio wave radiated by the antenna device 100 and the measurement angle of the reflection unit 202 is φ + θ -(N-1) Measurement data obtained by measuring the electric field strength of the radio wave received by the radio wave receiving unit 204 when it is as described, and the radio wave radiated by the antenna device 100 and the measurement angle of the reflection unit 202 is φ + θ -N Select N pieces of measurement data including the measurement data obtained by measuring the electric field strength of the radio wave received by the radio wave receiving unit 204 when it is as described. Thereby, the information processing device 300 selects 2N + 1 pieces of measurement data.

[0084] In S112, the information processing device 300 determines the radio wave received by the antenna device 200 when the rotation angle of the reflection unit 202 radiated by the antenna device 100 is the target rotation angle based on the plurality of measurement data selected in S110. For example, the information processing device 300 determines the radio wave received by the antenna device 200 when the rotation angle of the reflection unit 202 radiated by the antenna device 100 is the target rotation angle based on 2N + 1 pieces of measurement data.

[0085] The information processing device 300 determines the radio wave radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflecting unit 202 is the target rotation angle, by regarding the radio wave reflected by the reflecting unit 202 at a single measurement angle and received by the radio wave receiving unit 204 as the radio wave received by the virtual antenna 250, for example, by performing synthetic aperture processing based on a plurality of measurement data selected in S110. The information processing device 300 determines the radio wave radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflecting unit 202 is the target rotation angle, by regarding the radio wave reflected by the reflecting unit 202 at a plurality of measurement angles and received by the radio wave receiving unit 204 as the radio wave received by the virtual array 270 composed of a plurality of virtual antennas 250, for example, by performing synthetic aperture processing based on a plurality of measurement data selected in S110. The information processing device 300 performs synthetic aperture processing, for example, using the following mathematical formula.

[0086] [Number]

[0087] [Number] is the electric field strength of the vertically polarized wave component of the radio wave received by the virtual antenna 250 when the radio wave is radiated by the antenna device 100 and the rotation angle of the reflecting unit 202 is the target rotation angle. φ + φ SC is the target rotation angle. φ SC is the offset angle. E V (φ + θ n ) is the electric field strength of the vertically polarized wave component of the radio wave received by the virtual antenna 250 when the radio wave is radiated by the antenna device 100 and the measurement angle of the reflecting unit 202 is φ + θ n is. w n is the Gaussian window. k SC is the wave number vector of the radio wave received by the virtual antenna 250 when the rotation angle of the reflecting unit 202 is the target rotation angle. R nis the position vector of the virtual antenna 250 when the measurement angle of the reflection unit 202 is φ + θ n Here, R is the distance from the reflection unit 202 to the virtual antenna 250, and σ is the standard deviation defining the width of the Gaussian window.

[0088] The information processing device 300 may determine the electric field strength of the horizontally polarized wave component of the radio wave radiated by the antenna device 100 and received by the virtual antenna 250 when the rotation angle of the reflection unit 202 is the target rotation angle. In this case, the formula of the above synthetic aperture processing is transformed as follows.

[0089] [Number]

[0090] [Number] is the electric field strength of the horizontally polarized wave component of the radio wave radiated by the antenna device 100 and received by the virtual antenna 250 when the rotation angle of the reflection unit 202 is the target rotation angle. E H (φ + θ n ) is the electric field strength of the horizontally polarized wave component of the radio wave radiated by the antenna device 100 and received by the virtual antenna 250 when the measurement angle of the reflection unit 202 is φ + θ n

[0091] In the formula of the above synthetic aperture processing, k SC ·R n is the inner product of k SC and R n k SC ·R n can be expressed as k SC ·R n = kRcosα. Here, α is the angle between k SC and R n .

[0092] As shown in the formula of the above synthetic aperture processing, k SC and R​n includes φ. Thus, k SC and R n even if the φ included in SC k and R n is omitted, the angle α formed by k SC ·R n does not change. From the above, the formula of the synthetic aperture process described above may be transformed as follows.

[0093]

Equation

[0094] The information processing apparatus 300 determines, for example, radio waves received by the antenna apparatus 200 when the radio waves radiated by the antenna apparatus 100 and the rotation angle of the reflecting unit 202 are each of a plurality of target rotation angles at predetermined angular intervals. The angular interval may step coincide with φ. The angular interval may be shorter than AS.

[0095] Here, when φ = 0°, AS = 2°, and φ step = 0.1°, an example of a process in which the information processing apparatus 300 determines radio waves received by the antenna apparatus 200 when the radio waves radiated by the antenna apparatus 100 and the rotation angle of the reflecting unit 202 are each of a plurality of target rotation angles by scanning φ SC will be described. In this case, the plurality of target rotation angles are 19 rotation angles of 0.1°, 0.2°, ···, 1.8°, and 1.9°.

[0096] First, the information processing apparatus 300 sets φ SC = 0.1° to determine radio waves received by the antenna apparatus 200 when the radio waves radiated by the antenna apparatus 100 and the rotation angle of the reflecting unit 202 are 0.1°. Next, the information processing apparatus 300 sets φ SC to φ stepBy only performing scanning, the radio wave radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflecting portion 202 is 0.2° is determined. Thereafter, the information processing device 300 similarly scans φ SC to determine the radio wave radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflecting portion 202 is 1.9°.

[0097] In S114, the information processing device 300, based on the electric field strength of the radio wave radiated by the antenna device 100 and received at a plurality of measurement angles of the reflecting portion 202 by the antenna device 200, included in the plurality of measurement data selected in S110, and the electric field strength of the radio wave radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflecting portion 202 is each target rotation angle of the plurality of target rotation angles determined in S112, determines the rotation angle of the reflecting portion 202 when the radio wave radiated by the antenna device 100 arrives at the antenna device 200 with the maximum electric field strength. For example, when AS = 2° and φ step = 0.1°, the information processing device 300, based on the electric field strength of the radio wave radiated by the antenna device 100 and received at 2N + 1 measurement angles of the reflecting portion 202 by the antenna device 200, and the electric field strength of the radio wave radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflecting portion 202 is each target rotation angle of 2N × 19 target rotation angles, determines the rotation angle of the reflecting portion 202 when the radio wave radiated by the antenna device 100 arrives at the antenna device 200 with the maximum electric field strength.

[0098] The applicant has developed a so-called "rotating reflector antenna" that receives radio waves reflected by a reflector with a parabolic shape while changing the rotation angle of the reflector by rotating the reflector relative to a primary radiator with a fixed position and angle. One of the advantages of the rotating reflector antenna is that the arrival direction of radio waves can be determined at high speed by rotating the reflector. On the other hand, when receiving radio waves with short wavelengths such as in the terahertz band and high SHF band using a rotating reflector antenna, a parabolic reflector with a large aperture is required when narrowing the beam width of the radio waves received by the primary radiator. A parabolic reflector with a large aperture tends to have a high manufacturing cost. Furthermore, due to the processing limits of processing machines and the like, it may not be possible to manufacture a parabolic reflector with a large aperture. In addition, when determining the arrival direction of radio waves with high precision using a rotating reflector antenna, it is necessary to finely change the angular interval of the rotation angle of the reflector when the reflector reflects radio waves from the outside to obtain a large number of measurement data. As a result, when determining the arrival direction of radio waves with high precision using a rotating reflector antenna, the arrival direction of radio waves cannot be determined in a short measurement time. From the above, it is desirable to be able to realize an antenna that can receive radio waves with short wavelengths with a narrow beam width at a low manufacturing cost, and to be able to determine the arrival direction of radio waves with high precision in a short measurement time.

[0099] On the other hand, according to the system 10 according to the present embodiment, the antenna device 200 that receives radio waves at the radio wave receiving unit 204 while changing the rotation angle of the reflecting unit 202 by rotating the reflecting unit 202 having a plate-like shape with respect to the radio wave receiving unit 204 receives radio waves from the antenna device 100. Since the shape of the reflecting unit 202 is plate-like, a commercially available flat mirror or the like can be used as the reflecting unit 202. And by increasing the distance between the reflecting unit 202 and the radio wave receiving unit 204, it is possible to realize a large aperture of the antenna without performing special processing. Therefore, the antenna device 200 having the reflecting unit 202 with a plate-like shape can realize a large aperture of the antenna required for receiving radio waves with a short wavelength and a narrow beam width at a low manufacturing cost as compared with a rotating reflecting mirror antenna having a parabolic reflecting mirror. Furthermore, according to the system 10 according to the present embodiment, the information processing device 300 determines, based on a plurality of measurement data measured by the antenna device 200 receiving radio waves radiated by the antenna device 100 at a plurality of measurement angles of the reflecting unit 202, the radio waves radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflecting unit 202 is the target rotation angle. By the information processing device 300 determining the radio waves received by the antenna device 200 when the rotation angle of the reflecting unit 202 is the target rotation angle based on the plurality of measurement data, it is possible to determine the arrival direction of the radio waves with high precision using a small number of measurement data. Therefore, the system 10 according to the present embodiment can determine the arrival direction of radio waves with high precision in a short measurement time. From the above, the system 10 according to the present embodiment can realize an antenna capable of receiving radio waves with a short wavelength and a narrow beam width at a low manufacturing cost, and can determine the arrival direction of radio waves with high precision in a short measurement time.

[0100] FIG. 8 shows an example of a simulation result of simulating radio waves received by the antenna device 200. In an example shown in FIG. 8, it is assumed that the rotation angle of the reflecting unit 202 is 1° when radio waves radiated by the antenna device 100 arrive at the antenna device 200 with the maximum electric field strength.

[0101] Here, the description will continue assuming that the simulation conditions are AS = 2° and φ step = 1°. In this case, the information processing apparatus 300 measures the measurement data of the electric field strength of the radio wave received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = -180°, the measurement data of the electric field strength of the radio wave received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = -178°, ···. Further, the information processing apparatus 300 executes synthetic aperture processing to determine the radio waves received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = -179°, the radio waves received by the radio wave receiving unit 204 after being reflected by the reflecting unit 202 when θ = -177°, ···.

[0102] The horizontal axis of the graph shown in FIG. 8 is the rotation angle [°] of the reflecting unit 202. The vertical axis of the graph shown in FIG. 8 is the electric field strength [dB] of the vertically polarized wave component of the radio wave received by the radio wave receiving unit 204. The thin line of the graph shown in FIG. 8 is the simulation result when synthetic aperture processing is not executed. The thick line of the graph shown in FIG. 8 is the simulation result when synthetic aperture processing is executed.

[0103] In the simulation result when synthetic aperture processing is not executed, it can only be determined that the rotation angle of the reflecting unit 202 is in the range from 0° to 2° when the radio wave radiated by the antenna device 100 arrives at the antenna device 200 with the maximum electric field strength. On the other hand, in the simulation result when synthetic aperture processing is executed, it can be determined that the rotation angle of the reflecting unit 202 is 1° when the radio wave radiated by the antenna device 100 arrives at the antenna device 200 with the maximum electric field strength. Therefore, as shown by the simulation result, the system 10 according to the present embodiment can determine the arrival direction of the radio wave with high precision using a small number of measurement data by executing synthetic aperture processing.

[0104] FIG. 9 schematically shows an example of the functional configuration of the information processing apparatus 300. The information processing apparatus 300 includes an acquisition unit 302, a storage unit 304, a determination unit 306, and a selection unit 308. Note that it is not always essential for the information processing apparatus 300 to have all of these configurations.

[0105] The acquisition unit 302 acquires various data. The acquisition unit 302 acquires measurement data from, for example, the VNA 500. The acquisition unit 302 acquires angular data from, for example, the angle controller 400. The acquisition unit 302 may store the acquired various data in the storage unit 304.

[0106] The acquisition unit 302 acquires a plurality of measurement data measured, for example, by the antenna device 200 receiving the radio wave radiated by the antenna device 100 at the measurement angle of one reflection unit 202. The acquisition unit 302 acquires a plurality of measurement data measured, for example, by the antenna device 200 receiving the radio wave radiated by the antenna device 100 at a plurality of measurement angles of the reflection unit 202.

[0107] The determination unit 306 determines the radio wave received by the antenna device 200 when the radio wave radiated by the antenna device 100 and the rotation angle of the reflection unit 202 are the target rotation angle. The determination unit 306 determines, for example, the radio wave received by the antenna device 200 when the radio wave radiated by the antenna device 100 and the rotation angle of the reflection unit 202 are the target rotation angle based on a plurality of measurement data stored in the storage unit 304.

[0108] The determination unit 306 determines, for example, the radio wave received by the antenna device 200 when the radio wave radiated by the antenna device 100 and the rotation angle of the reflection unit 202 are the target rotation angle by performing a base conversion process on each measurement data of the plurality of measurement data. For example, the determination unit 306 determines φ which is the measurement angle at the center of the plurality of measurement angles of the reflection unit 202 corresponding to the plurality of measurement data. Thereafter, the determination unit 306 performs a base conversion process on each measurement data of the plurality of measurement data using the above-described mathematical formula.

[0109] The determination unit 306 determines the radio wave received by the antenna device 200 when the radio wave radiated by the antenna device 100 and reflected by the reflecting unit 202 at a plurality of measurement angles of the reflecting unit 202 is synthesized, and the rotation angle of the reflecting unit 202 is the target rotation angle. For example, the determination unit 306 executes synthetic aperture processing based on the plurality of measurement data, and regards the radio wave reflected by the reflecting unit 202 and received by the radio wave receiving unit 204 as the radio wave received by the virtual antenna 250, thereby determining the radio wave received by the antenna device 200 when the radio wave radiated by the antenna device 100 and the rotation angle of the reflecting unit 202 is the target rotation angle. For example, the determination unit 306 executes synthetic aperture processing based on the plurality of measurement data, and regards the radio wave reflected by the reflecting unit 202 at a plurality of measurement angles and received by the radio wave receiving unit 204 as the radio wave received by the virtual array 270 composed of a plurality of virtual antennas 250, thereby determining the radio wave received by the antenna device 200 when the radio wave radiated by the antenna device 100 and the rotation angle of the reflecting unit 202 is the target rotation angle. For example, the determination unit 306 executes synthetic aperture processing using the above-mentioned mathematical formula.

[0110] The determination unit 306 determines the radio wave received by the antenna device 200 when the rotation angle of the reflecting unit 202 is each target rotation angle of a plurality of target rotation angles of the radio wave radiated by the antenna device 100. For example, the determination unit 306 determines the radio wave received by the antenna device 200 when the rotation angle of the reflecting unit 202 is each target rotation angle of a plurality of target rotation angles at a predetermined angular interval of the radio wave radiated by the antenna device 100. For example, the determination unit 306 scans φ SC to determine the radio wave received by the antenna device 200 when the rotation angle of the reflecting unit 202 is each target rotation angle of a plurality of target rotation angles of the radio wave radiated by the antenna device 100. For example, the determination unit 306 uses the angle controller 400 to scan φ SC to scan.

[0111] The selection unit 308 selects a plurality of measurement data used to determine the radio wave radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflection unit 202 is the target rotation angle. The determination unit 306 may determine the radio wave radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflection unit 202 is the target rotation angle based on the plurality of measurement data selected by the selection unit 308.

[0112] The selection unit 308 selects, for example, among the plurality of measurement data stored in the storage unit 304, which are measured by the antenna device 200 receiving the radio wave radiated by the antenna device 100 by rotating the reflection unit 202 one or more rotations with respect to the radio wave receiving unit 204, a plurality of measurement data used to determine the radio wave radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflection unit 202 is the target rotation angle. The selection unit 308 selects, for example, a plurality of measurement data used to determine the radio wave radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflection unit 202 is the target rotation angle by selecting measurement data centered on the measurement data measuring the electric field strength of the radio wave received by the radio wave receiving unit 204 when the measurement angle of the reflection unit 202 is φ and radiated by the antenna device 100.

[0113] The determination unit 306 determines, for example, the rotation angle of the reflection unit 202 when the radio wave radiated by the antenna device 100 and received at a plurality of measurement angles of the reflection unit 202 by the antenna device 200 and the radio wave radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflection unit 202 is each target rotation angle of a plurality of target rotation angles, based on the electric field strength of the radio wave arriving at the antenna device 200 with the maximum electric field strength. The determination unit 306 determines, for example, the rotation angle of the reflection unit 202 when the vertically polarized wave component of the radio wave radiated by the antenna device 100 arrives at the antenna device 200 with the maximum electric field strength. The determination unit 306 determines, for example, the rotation angle of the reflection unit 202 when the horizontally polarized wave component of the radio wave radiated by the antenna device 100 arrives at the antenna device 200 with the maximum electric field strength.

[0114] FIG. 10 schematically shows an example of the hardware configuration of a computer 1200 that functions as the information processing device 300. The program installed in the computer 1200 causes the computer 1200 to function as one or more "units" of the device according to the present embodiment, or causes the computer 1200 to execute an operation associated with the device according to the present embodiment or the one or more "units", and / or causes the computer 1200 to execute the process according to the present embodiment or a stage of the process. Such a program may be executed by the CPU 1212 so as to cause the computer 1200 to execute specific operations associated with some or all of the blocks of the flowcharts and block diagrams described herein.

[0115] The computer 1200 according to this embodiment includes a CPU 1212, a RAM 1214, and a graphic controller 1216, which are interconnected by a host controller 1210. The computer 1200 also includes input / output units such as a communication interface 1222, a storage device 1224, a DVD drive 1226, and an IC card drive, which are connected to the host controller 1210 via an input / output controller 1220. The DVD drive 1226 may be a DVD-ROM drive, a DVD-RAM drive, or the like. The storage device 1224 may be a hard disk drive, a solid state drive, or the like. The computer 1200 also includes legacy input / output units such as a ROM 1230 and a keyboard, which are connected to the input / output controller 1220 via an input / output chip 1240.

[0116] The CPU 1212 operates according to programs stored in the ROM 1230 and the RAM 1214, thereby controlling each unit. The graphic controller 1216 acquires image data generated by the CPU 1212 in a frame buffer or the like provided in the RAM 1214 or within itself, and causes the image data to be displayed on the display device 1218.

[0117] The communication interface 1222 communicates with other electronic devices via a network. The storage device 1224 stores programs and data used by the CPU 1212 within the computer 1200. The DVD drive 1226 reads a program or data from a DVD-ROM 1227 or the like and provides it to the storage device 1224. The IC card drive reads programs and data from an IC card and / or writes programs and data to an IC card.

[0118] ROM 1230 stores therein a boot program or the like executed by the computer 1200 upon activation, and / or a program dependent on the hardware of the computer 1200. The input / output chip 1240 may also be connected to the input / output controller 1220 via various input / output units such as a USB port, a parallel port, a serial port, a keyboard port, a mouse port, etc.

[0119] The program is provided by a computer-readable storage medium such as a DVD-ROM 1227 or an IC card. The program is read from the computer-readable storage medium, installed in the storage device 1224, the RAM 1214, or the ROM 1230 which is also an example of a computer-readable storage medium, and executed by the CPU 1212. The information processing described in these programs is read by the computer 1200, resulting in the cooperation between the programs and the various types of hardware resources described above. The apparatus or method may be configured by realizing the operation or processing of information according to the use of the computer 1200.

[0120] For example, when communication is executed between the computer 1200 and an external device, the CPU 1212 may execute a communication program loaded in the RAM 1214 and instruct the communication interface 1222 to perform communication processing based on the processing described in the communication program. The communication interface 1222 reads the transmission data stored in the transmission buffer area provided in a recording medium such as the RAM 1214, the storage device 1224, the DVD-ROM 1227, or the IC card under the control of the CPU 1212, transmits the read transmission data to the network, or writes the received data received from the network to the reception buffer area or the like provided on the recording medium.

[0121] Further, the CPU 1212 may cause all or a necessary part of a file or database stored in an external recording medium such as the storage device 1224, the DVD drive 1226 (DVD-ROM 1227), an IC card, etc. to be read into the RAM 1214, and may execute various types of processing on the data on the RAM 1214. Next, the CPU 1212 may write back the processed data to the external recording medium.

[0122] Various types of information such as various types of programs, data, tables, and databases may be stored in a recording medium and may be subjected to information processing. The CPU 1212 may perform various types of processing on the data read from the RAM 1214, including various types of operations, information processing, conditional judgment, conditional branch, unconditional branch, information search / replacement, etc. described throughout this disclosure and specified by the instruction sequence of the program, and write back the result to the RAM 1214. Also, the CPU 1212 may search for information in files, databases, etc. within the recording medium. For example, when a plurality of entries each having an attribute value of a first attribute associated with an attribute value of a second attribute are stored in the recording medium, the CPU 1212 searches for an entry that matches the condition where the attribute value of the first attribute is specified among the plurality of entries, reads the attribute value of the second attribute stored in the entry, and thereby may obtain the attribute value of the second attribute associated with the first attribute that satisfies a predetermined condition.

[0123] The programs or software modules described above may be stored in a computer-readable storage medium on or near the computer 1200. Also, a recording medium such as a hard disk or RAM provided in a server system connected to a dedicated communication network or the Internet can be used as a computer-readable storage medium, thereby providing the program to the computer 1200 via the network.

[0124] In the flowchart and block diagram in this embodiment, the blocks may represent stages of a process in which an operation is executed or "parts" of a device having a role of executing an operation. Specific stages and "parts" may be implemented by a dedicated circuit, a programmable circuit supplied with computer-readable instructions stored on a computer-readable storage medium, and / or a processor supplied with computer-readable instructions stored on a computer-readable storage medium. The dedicated circuit may include digital and / or analog hardware circuits, and may include an integrated circuit (IC) and / or discrete circuits. The programmable circuit may include, for example, a reconfigurable hardware circuit including logical products, logical sums, exclusive logical sums, negative logical products, negative logical sums, and other logical operations, flip-flops, registers, and memory elements, such as a field programmable gate array (FPGA) and a programmable logic array (PLA).

[0125] The computer-readable medium may include any tangible device capable of storing instructions executable by an appropriate device, and as a result, the computer-readable medium having the instructions stored therein will comprise a product including instructions executable to create means for performing the operations specified in the flowchart or block diagram. Examples of the computer-readable medium may include electronic storage media, magnetic storage media, optical storage media, electromagnetic storage media, semiconductor storage media, and the like. More specific examples of the computer-readable medium may include floppy (registered trademark) disks, diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), electrically erasable programmable read-only memory (EEPROM), static random access memory (SRAM), compact disk read-only memory (CD-ROM), digital versatile disk (DVD), Blu-ray (registered trademark) disk, memory stick, integrated circuit card, and the like.

[0126] Computer-readable instructions may include any combination of one or more programming languages, including assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state-setting data, or source code or object code written in an object-oriented programming language such as Smalltalk®, JAVA®, C++, and a conventional procedural programming language such as the "C" programming language or a similar programming language.

[0127] Computer-readable instructions may be executed to create means for a processor or programmable circuit of a programmable data processing apparatus such as a computer to perform the operations specified in a flowchart or block diagram, provided locally or via a wide area network (WAN) such as a local area network (LAN), the Internet, etc. Here, the computer may be a personal computer (PC), tablet computer, smartphone, workstation, server computer, general-purpose computer, or special-purpose computer, etc., or may be a computer system with a plurality of computers connected thereto. Such a computer system with a plurality of computers connected thereto is also called a distributed computing system and is a computer in a broad sense. In a distributed computing system, each of the plurality of computers executes a part of the program and, if necessary, passes data during program execution between the computers, so that the plurality of computers collectively execute the program.

[0128] Examples of processors include computer processors, central processing units (CPUs), processing units, microprocessors, digital signal processors, controllers, microcontrollers, etc. A computer may include one processor or multiple processors. In a multiprocessor system with multiple processors, each processor executes a part of the program and, if necessary, the processors exchange data during program execution with each other so that the multiple processors execute the program collectively. For example, in the execution of multitasking, each of the multiple processors may execute a small part of each task by switching tasks every time slice. In this case, which part of a program each processor executes changes dynamically. Which part of a program each of the multiple processors executes may be statically determined by programming that takes into account the multiprocessor.

[0129] As described above, the present invention has been described using embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various changes or improvements can be made to the above embodiments. It is clear from the description of the claims that forms with such changes or improvements can also be included in the technical scope of the present invention.

[0130] It should be noted that the execution order of each process such as operations, procedures, steps, and stages in the devices, systems, programs, and methods shown in the claims, the specification, and the drawings is not explicitly stated as "earlier" or "preceding" etc., and can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flows in the claims, the specification, and the drawings, even if explanations are given using "first," "next," etc. for convenience, it does not mean that it is essential to implement in this order.

Description of Reference Numerals

[0131] 10 System, 100 Antenna device, 200 Antenna device, 202 Reflecting part, 204 Radio wave receiving part, 205 Aperture plane, 206 Support part, 208 Angle changing part, 250 Virtual antenna, 252 Aperture plane, 270 Virtual array, 300 Information processing device, 302 Acquisition part, 304 Storage part, 306 Determination part, 308 Selection part, 400 Angle controller, 500 VNA, 1200 Computer, 1210 Host controller, 1212 CPU, 1214 RAM, 1216 Graphic controller, 1218 Display device, 1220 Input / output controller, 1222 Communication interface, 1224 Storage device, 1226 DVD drive, 1227 DVD-ROM, 1230 ROM, 1240 Input / output chip

Claims

1. A first antenna device having a radio wave radiating portion that radiates radio waves in the terahertz wave band or a high SHF (super high frequency) band; a second antenna device including a radio wave receiving unit, a plate-shaped reflecting unit that reflects radio waves from outside, and an angle changing unit that changes a rotation angle of the reflecting unit when the reflecting unit reflects radio waves from outside by rotating and moving the reflecting unit relative to the radio wave receiving unit; an information processing device having: an acquisition unit that acquires a plurality of measurement data measured by the second antenna device by reflecting and receiving the radio waves radiated by the first antenna device at the reflecting portion at a plurality of measurement angles; and a determination unit that determines, based on the plurality of measurement data, radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflecting portion is a target rotation angle that is not included in the plurality of measurement angles; A system comprising:

2. The system according to claim 1 , wherein the radio wave radiating unit radiates radio waves while the second antenna device is receiving radio waves, with the position and angle being fixed.

3. 3. The system according to claim 1, wherein the determination unit determines the radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflector is the target rotation angle, based on radio waves obtained by combining the radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflector is each of the multiple measurement angles.

4. 4. The system according to claim 3, wherein the determination unit performs synthetic aperture processing based on the multiple measurement data, and considers the radio waves reflected by the reflector and received by the radio wave receiving unit to be radio waves received by a virtual antenna located at a position symmetrical to the position of the radio wave receiving unit with respect to the reflector, thereby determining the radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflector is the target rotation angle.

5. The determination unit executes the synthetic aperture process using the following formula: [0010] Where: [0025] is the electric field intensity of the vertically polarized component of the radio wave radiated by the first antenna device and received by the virtual antenna when the rotation angle of the reflector is the target rotation angle, and φ + φ ＳＣ is the target rotation angle, φ is a central measurement angle of the plurality of measurement angles, and φ ＳＣ is the offset angle, E Ｖ (φ+θ ｎ ) is radiated by the first antenna device and the measurement angle of the reflector is φ+θ ｎ is the electric field strength of the vertically polarized component of the radio wave received by the virtual antenna when θ ｎ is n×AS, where AS is a first angular interval of the plurality of measured angles, and w ｎ is a Gaussian window, and k ＳＣ is the wave vector of the radio wave received by the virtual antenna when the rotation angle of the reflector is the target rotation angle, and R ｎ The measurement angle of the reflecting part is φ+θ ｎ where R is the distance from the reflector to the virtual antenna, and σ is the standard deviation that defines the width of the Gaussian window. The system of claim 4.

6. The angle changing unit rotates the reflecting unit at least one revolution relative to the radio wave receiving unit, the information processing device further includes a selection unit that selects, from a plurality of pieces of measurement data measured by the second antenna device by rotating the reflector one or more times relative to the radio wave receiving unit and receiving the radio waves radiated by the first antenna device, the plurality of pieces of measurement data used to determine radio waves radiated by the first antenna device and received by the second antenna device when a rotation angle of the reflector is the target rotation angle; the determination unit determines, based on the plurality of measurement data selected by the selection unit, radio waves that are radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflector is the target rotation angle.

3. A system according to claim 1 or 2.

7. the angle changing unit rotates and moves the reflecting unit relative to the radio wave receiving unit so that the reflecting unit reflects the radio wave radiated by the first antenna device at the plurality of measurement angles at a predetermined first angle interval; the determination unit determines radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflector is each of the plurality of target rotation angles at a predetermined second angle interval.

3. A system according to claim 1 or 2.

8. The system of claim 7 , wherein the second angular interval is a shorter angular interval than the first angular interval.

9. 3. The system described in claim 1 or 2, wherein the determination unit determines the rotation angle of the reflector when the radio waves radiated by the first antenna device arrive at the second antenna device with maximum electric field strength, based on the electric field strength of the radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflector is each of the multiple measurement angles, and the electric field strength of the radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflector is each of the multiple target rotation angles.

10. a second antenna device having a radio wave receiving unit, a reflecting unit having a plate-like shape that reflects radio waves from outside, and an angle changing unit that changes a rotation angle of the reflecting unit when the reflecting unit reflects radio waves from outside by rotating and moving the reflecting unit relative to the radio wave receiving unit, and an acquiring unit that acquires multiple pieces of measurement data measured by receiving radio waves in the terahertz wave band or high SHF wave band radiated by a radio wave radiating unit of a first antenna device by reflecting them at the reflecting unit at multiple measurement angles; a determination unit that determines, based on the plurality of measurement data, radio waves that are radiated by the first antenna device and received by the second antenna device when a rotation angle of the reflector is a target rotation angle that is not included in the plurality of measurement angles; An information processing device comprising:

11. On the computer, an acquisition step in which a second antenna device having a radio wave receiving unit, a reflecting unit having a plate-like shape and reflecting external radio waves, and an angle changing unit which changes a rotation angle of the reflecting unit when the reflecting unit reflects external radio waves by rotating and moving the reflecting unit relative to the radio wave receiving unit, acquires a plurality of measurement data measured by receiving radio waves in the terahertz wave band or high SHF wave band radiated by a radio wave radiating unit of a first antenna device by reflecting the radio waves at the reflecting unit at a plurality of measurement angles; a determination step of determining, based on the plurality of measurement data, radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflector is a target rotation angle that is not included in the plurality of measurement angles; A program for executing the above.

12. A method executed by a system including: a first antenna device having a radio wave emitting portion that emits radio waves in the terahertz wave band or the high SHF band; a radio wave receiving portion; a second antenna device having a plate-shaped reflecting portion that reflects radio waves from outside; and an angle changing portion that changes a rotation angle of the reflecting portion when the reflecting portion reflects radio waves from outside by rotating and moving the reflecting portion relative to the radio wave receiving portion; and an information processing device, a receiving step in which the second antenna device receives radio waves radiated by the first antenna device by reflecting the radio waves at the reflecting portions at a plurality of measurement angles; an acquisition step in which the information processing device acquires a plurality of measurement data measured by the second antenna device reflecting and receiving the radio waves radiated by the first antenna device at the reflecting portions at the plurality of measurement angles in the reception step; a determination step in which the information processing device determines, based on the plurality of measurement data acquired in the acquisition step, radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflector is a target rotation angle that is not included in the plurality of measurement angles; A method comprising:

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