System, information processing device, program, and method

Abstract

SOLUTION: A system comprises: a first antenna device including a radio wave emitting unit which emits radio waves of a terahertz band or high SHF band; a second antenna device including a radio wave receiving unit, a reflecting unit which reflects external radio waves and has a plate-like shape, and an angle changing unit which changes the rotation angle of the reflecting unit when reflecting external radio waves by rotationally moving the reflecting unit relative to the radio wave receiving unit; and an information processing device including an acquisition unit which acquires a plurality of pieces of measurement data measured when the second antenna device receives the radio waves emitted by the first antenna device at a plurality of measurement angles of the reflecting unit and a determination unit which determines the radio wave emitted by the first antenna device and received by the second antenna device when the rotation angle of the reflecting unit is a target rotation angle not included among the plurality of measurement angles on the basis of the plurality of pieces of measurement data.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Patent Document 1 describes a technology for identifying the combination of the emission direction and reception direction of radio waves in the terahertz wave band. Patent Document 2 describes a technology for changing the polarization of radio waves by adjusting the reflector of an antenna device. Patent Document 3 describes an antenna device that uses a reflector to perform azimuth scanning using a rotary drive device, and that is configured to eliminate electrical moving contacts and ensure that the primary radiator does not block the radio wave path between the reflector and free space. Non-Patent Document 1 describes a technology for applying a synthetic aperture direction-of-arrival measurement method to a measurement method using a rotating reflector. [Prior art document] [Patent documents] [Patent Document 1] Patent No. 7246537 [Patent Document 2] Patent No. 7301911 [Patent Document 3] JP 2007-251664 A [Non-patent literature] "Non-Patent Document 1" by Ryo Yamaguchi and Kazuma Toyomimoto, "Study on a synthetic aperture type direction of arrival measurement method using a rotating reflector - Concave circular arc virtual array synthetic beam generation method using a primary radiator mirror image -" Institute of Electronics, Information and Communication Engineers, December 2020, pp. 29-32 Summary of the Invention [Means for solving the problem]

[0003] According to one embodiment of the present invention, there is provided a system. The system may include a first antenna device having a radio wave emitting portion that emits radio waves in the terahertz wave band or a high SHF (Super High Frequency) band. The system may include a second antenna device having a radio wave receiving portion, a plate-shaped reflecting portion that reflects radio waves from outside, and an angle changing portion that changes the rotation angle of the reflecting portion when the reflecting portion reflects the radio waves from outside by rotating the reflecting portion relative to the radio wave receiving portion. The system may also include an information processing device having an acquisition portion that acquires multiple measurement data measured by the second antenna device reflecting and receiving radio waves radiated by the first antenna device at multiple measurement angles, and a determination portion that determines, based on the multiple 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 multiple measurement angles.

[0004] In the system, the radio wave emitting unit may emit radio waves while the second antenna device is receiving radio waves, with the position and angle being fixed.

[0005] In any of the above systems, the determination unit may determine 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.

[0006] In any of the systems, the determination unit may perform synthetic aperture processing based on the plurality of measurement data, and by regarding the radio waves reflected by the reflecting unit and received by the radio wave receiving unit as 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 reflecting unit, determine the radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflecting unit is the target rotation angle.

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

[0008]

number

[0009]

number

[0010] In any of the above systems, the angle change unit may rotate the reflecting unit one or more times relative to the radio wave receiving unit, and the information processing device may further have a selection unit that selects, from a plurality of measurement data measured by the second antenna device rotating the reflecting unit one or more times relative to the radio wave receiving unit to receive radio waves radiated by the first antenna device, the plurality of measurement data used to determine the radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflecting unit is the target rotation angle, and the determination unit may determine the radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflecting unit 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 change unit may rotate the reflecting unit relative to the radio wave receiving unit so that the reflecting unit reflects the radio waves emitted by the first antenna device at the plurality of measurement angles at a predetermined first angle interval, and the determination unit may determine the radio waves emitted by the first antenna device and received by the second antenna device when the rotation angle of the reflecting unit is each of the plurality of target rotation angles at a predetermined second angle interval.

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

[0013] In any of the above systems, the determination unit may determine the rotation angle of the reflector when the radio waves radiated by the first antenna device arrive at the second antenna device with the maximum 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 plurality of 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 plurality of target rotation angles.

[0014] According to one embodiment of the present invention, there is provided an information processing device. The information processing device may include an acquisition unit that acquires a plurality of measurement data measured by a second antenna device having a radio wave receiving unit, a plate-shaped reflecting unit that reflects radio waves from an external source, and an angle change unit that rotates the reflecting unit relative to the radio wave receiving unit to change the rotation angle of the reflecting unit when the reflecting unit reflects radio waves from an external source. The second antenna device receives radio waves in the terahertz wave band or the high SHF wave band radiated by a radio wave radiating unit of a first antenna device and reflects them at a plurality of measurement angles using the reflecting unit. The information processing device may also include 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 unit is a target rotation angle that is not included in the plurality of measurement angles.

[0015] According to one embodiment of the present invention, a program is provided for causing a computer to execute an acquisition procedure in which a second antenna device having a radio wave receiving unit, a reflecting unit that reflects radio waves from outside and is plate-shaped, and an angle change unit that changes the 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, acquires multiple 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, and a determination procedure in which, based on the multiple measurement data, radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflecting unit is a target rotation angle that is not included in the multiple measurement angles.

[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 emitting portion that emits radio waves in the terahertz wave band or the high SHF wave band; a second antenna device having a radio wave receiving portion, a plate-shaped reflecting portion that reflects radio waves from outside, and an angle changing portion that changes the rotation angle of the reflecting portion when reflecting the radio waves from outside by rotating the reflecting portion relative to the radio wave receiving portion; and an information processing device. The method may include a receiving step in which the second antenna device receives radio waves radiated by the first antenna device by reflecting them at the reflecting portion at a plurality of measurement angles. The method may also include an acquiring step in which the information processing device acquires a plurality of measurement data measured by the second antenna device receiving the radio waves radiated by the first antenna device by reflecting them at the reflecting portion at the plurality of measurement angles. The method may include 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.

[0017] The above summary of the invention does not list all of the necessary features of the present invention, and subcombinations of these features may also constitute inventions. [Brief explanation of the drawings]

[0018] [Figure 1] An example of a system 10 is shown schematically. [Figure 2] 2 shows a schematic diagram of an example of an antenna device 200. [Figure 3] 10 is an explanatory diagram for explaining an example of the relationship between a radio wave receiving unit 204 and a virtual antenna 250. FIG. [Figure 4] FIG. 10 is an explanatory diagram for explaining an example of a virtual array 270. [Figure 5] FIG. 2 is an explanatory diagram for explaining an example of the position of a virtual antenna 250. [Figure 6] FIG. 10 is an explanatory diagram for explaining an example of a target rotation angle. [Figure 7] FIG. 2 is an explanatory diagram for explaining an example of a processing flow of the system 10. [Figure 8] An example of a simulation result of radio waves received by the antenna device 200 is shown. [Figure 9] 2 shows an example of a functional configuration of an information processing device 300. [Figure 10] An example of the hardware configuration of a computer 1200 that functions as the information processing device 300 is shown in schematic form. DETAILED DESCRIPTION OF THE INVENTION

[0019] The applicant has developed a so-called "rotating reflector antenna," which has a fixed primary radiator and a rotating parabolic reflector. A rotating reflector antenna has a mechanism that allows the reflector to rotate infinitely at high speed, enabling high-speed directional scanning. However, to precisely detect the direction of arrival of a beam, the measurement angle interval of the rotating reflector antenna must be narrowed. As a result, the measurement speed decreases. Furthermore, to narrow the beam width, a large-aperture parabolic antenna must be prepared, and it may not be possible to fabricate a large-aperture parabolic antenna due to the processing limitations of processing machines. In the system according to this embodiment, for example, a mechanism is employed in which the primary radiator is fixed and a planar reflector is rotated to measure the beam, and then synthetic aperture processing is performed offline using the measurement data.

[0020] The present invention will be described below through embodiments of the invention, but the following embodiments do not limit the scope of the invention according to the claims. Furthermore, not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0021] 1 schematically illustrates an example of a 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 has, for example, a radio wave radiating portion. The antenna device 100 may be an example of a first antenna device.

[0023] The radio wave emitting unit emits radio waves. The radio wave emitting unit emits radio waves, for example, by emitting a beam. The radio wave emitting unit is an antenna capable of emitting orthogonally polarized radio waves.

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

[0025] The radio wave emitting unit may emit radio waves in the high SHF band, which may be radio waves in the 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 includes, for example, a reflecting section 202, a radio wave receiving section 204, a support section 206, and an angle changing section 208. The antenna device 200 may be an example of a second antenna device. The radio wave emitting section of the antenna device 100 may emit radio waves while the position and angle are fixed while the antenna device 200 is receiving radio waves.

[0027] The reflecting section 202 reflects radio waves from the outside, for example, radio waves emitted by the antenna device 100.

[0028] The reflecting portion 202 has, for example, a plate-like shape. The reflecting portion 202 has, for example, a flat reflective surface that reflects radio waves. The reflecting portion 202 is, for example, a flat reflecting plate.

[0029] The reflecting portion 202 may be any member that can reflect radio waves. The reflecting portion 202 is, for example, a mirror. The reflecting portion 202 is, for example, a flat reflecting mirror.

[0030] The radio wave receiving unit 204 receives radio waves. For example, the radio wave receiving unit 204 receives radio waves reflected by the reflecting unit 202. The radio wave receiving unit 204 is, for example, an antenna capable of receiving orthogonally polarized radio waves.

[0031] The support portion 206 supports the reflecting portion 202. The reflecting portion 202 and the support portion 206 may be integral with each other or may be different members.

[0032] The angle changer 208 rotates the reflector 202. The angle changer 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 outside, for example, by rotating the reflecting unit 202 relative to the radio wave receiving unit 204. For example, the angle changing unit 208 rotates the reflecting unit 202 relative to the radio wave receiving unit 204 so that the reflecting unit 202 reflects radio waves emitted by the antenna device 100 at a plurality of rotation angles (sometimes referred to as measurement angles) at predetermined angular intervals.

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

[0035] For example, the angle changing unit 208 rotates the reflecting unit 202 one or more times relative to the radio wave receiving unit 204. For example, if the angle changing unit 208 rotates the reflecting unit 202 one time relative to the radio wave receiving unit 204 so that the reflecting unit 202 reflects the radio waves emitted by the antenna device 100 at intervals of 2°, the reflecting unit 202 reflects the radio waves emitted by the antenna device 100 at 180 measurement angles. The angle changing unit 208 may rotate the reflecting unit 202 less than one time relative to the radio wave receiving unit 204.

[0036] The angle changer 208 rotates, for example, around a rotation axis, which may be perpendicular to the installation surface of the angle changer 208 on which the support 206 is installed.

[0037] The angle changer 208 rotates, for example, counterclockwise around the rotation axis, or may rotate clockwise around the rotation axis.

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

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

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

[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, a vector network analyzer (VNA) 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 in accordance with the control of 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 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 also 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 have the angle controller 400 built in.

[0045] The VNA 500 measures the field strength of radio waves received by the antenna device 200. For example, the VNA 500 measures the field strength of radio waves when the antenna device 200 receives radio waves radiated by the antenna device 100 at one measurement angle of the reflector 202. For example, the VNA 500 measures the field strength of radio waves when the antenna device 200 receives radio waves radiated by the antenna device 100 at multiple measurement angles of the reflector 202.

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

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

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

[0049] The VNA 500 transmits, for example, measurement data obtained by measuring the field intensity of radio waves received by the antenna device 200 to the information processing device 300. The VNA 500 transmits the measurement data to the information processing device 300 via, for example, a wired connection. The VNA 500 may also transmit the measurement data to the information processing device 300 via a wireless connection.

[0050] The VNA 500 may be replaced with any device capable of measuring the field strength of the radio waves received by the antenna device 200. The VNA 500 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 VNA 500. The information processing device 300 and the VNA 500 may be integrated. For example, the information processing device 300 may have the VNA 500 built in.

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

[0053] The information processing device 300 acquires measurement data from, for example, the VNA 500. The information processing device 300 acquires angle data corresponding to the measurement data from, for example, the angle controller 400.

[0054] For example, the information processing device 300 performs a basis transformation on the measurement data. For example, the information processing device 300 performs a basis transformation on the measurement data based on angle data corresponding to the measurement data.

[0055] The information processing device 300 may consider the radio waves reflected by the reflecting unit 202 and received by the radio wave receiving unit 204 to be radio waves received by a virtual antenna 250 located at a position symmetrical to the position of the radio wave receiving unit 204 with respect to the reflecting unit 202. For example, when the angle changing unit 208 rotates the reflecting unit 202 one or more times relative to the radio wave receiving unit 204 so that the reflecting unit 202 reflects the radio waves emitted by the antenna device 100 at a plurality of measurement angles, the information processing device 300 may consider the radio waves reflected by the reflecting unit 202 and received by the radio wave receiving unit 204 to be radio waves received by the virtual antennas 250 located at each of the plurality of black circles shown around the reflecting unit 202 in FIG.

[0056] The information processing device 300 may regard the radio waves reflected by the reflecting unit 202 and received by the radio wave receiving unit 204 as radio waves received by a virtual array 270 composed of multiple virtual antennas 250. For example, when the angle changing unit 208 rotates the reflecting unit 202 one or more times relative to the radio wave receiving unit 204 so that the reflecting unit 202 reflects the radio waves emitted by the antenna device 100 at multiple measurement angles, the information processing device 300 may select the multiple virtual antennas 250 that compose the virtual array 270.

[0057] For example, 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 reflector 202, the information processing device 300 determines radio waves radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is a target rotation angle that is not included in the plurality of measurement angles. For example, the information processing device 300 performs synthetic aperture processing on the aperture of the radio wave receiving unit 204 based on the plurality of measurement data, thereby determining radio waves radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is the target rotation angle. Specific processing by the information processing device 300 to determine radio waves radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is the target rotation angle will be described later.

[0058] 2 is a schematic diagram of an example of an antenna device 200. Here, the relationship between the rotation angle of the reflector 202 and the rotation angle of the virtual antenna 250 will be mainly described.

[0059] 2, the angle changer 208 rotates around a rotation axis parallel to the z-axis. Here, the rotation direction in which the angle changer 208 rotates counterclockwise around the rotation axis is defined as a positive rotation direction, and the rotation direction in which the angle changer 208 rotates clockwise around the rotation axis is defined as a negative rotation direction.

[0060] 2 , when angle changing unit 208 rotates reflecting unit 202 by an angle θ relative to radio wave receiving unit 204, virtual antenna 250 rotates by an angle θ. Therefore, θ may represent the rotation angle of reflecting unit 202 or the rotation angle of virtual antenna 250.

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

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

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

[0064] Furthermore, since virtual antenna 250 is located at a position symmetrical to the position of radio wave receiving unit 204 with respect to reflector 202, the angle formed by reflector 202 and a line perpendicular to aperture surface 252 of the opening of virtual antenna 250 is the same as the angle formed by reflector 202 and a line perpendicular to aperture surface 205 of the opening of radio wave receiving unit 204. In the example shown in Fig. 3, the line perpendicular to reflector 202 and aperture surface 205 is a line parallel to the z-axis, and the line perpendicular to reflector 202 and aperture surface 252 is a line parallel to the y-axis. In the example shown in Fig. 3, the angle formed by reflector 202 and a line perpendicular to aperture surface 205 and the angle formed by reflector 202 and a line perpendicular to aperture surface 252 are both 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 at which the reflecting unit 202 reflects the radio waves received by the radio wave receiving unit 204.

[0066] 4, virtual array 270 is composed of 2N+1 virtual antennas 250 located at 2N+1 black circles, where N is an integer greater than or equal to 0.

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

[0068] In the example shown in FIG. 4 , among the 2N+1 virtual antennas 250 constituting the virtual array 270, there is a virtual antenna 250 located at a black circle corresponding to θ=φ+θ1, a virtual antenna 250 located at a black circle corresponding to θ=φ+θ2, . . . , θ=φ+θ N-2 The virtual antenna 250 located at the black circle corresponding to θ=φ+θ N-1 and a virtual antenna 250 located at the black circle corresponding to θ=φ+θN The N virtual antennas 250 located at the black circles corresponding to θ=φ have a larger θ than the virtual antenna 250 located at the black circle corresponding to θ=φ. -1 The virtual antenna 250 located at the black circle corresponding to θ=φ+θ -2 A 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-1) and a virtual antenna 250 located at the black circle corresponding to θ=φ+θ -N The N virtual antennas 250 located on the black circles corresponding to θ=φ have a smaller θ than the virtual antennas 250 located on the black circles corresponding to θ=φ.

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

[0070] The position of the virtual antenna 250 may be represented by a position vector. In the example shown in FIG. 5, θ=φ+θ n The position vector R represents the position of the virtual antenna 250 located at the black circle corresponding to 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, where n is an integer that satisfies -N≦n≦N.

[0071] Fig. 6 is an explanatory diagram for explaining an example of the target rotation angle. Here, the origin of the xyz coordinate system shown in Fig. 6 is assumed to be the reflection point at which the reflecting unit 202 reflects the radio waves received by the radio wave receiving unit 204.

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

[0073] θ=φ+φ SC The radio wave reflected by the reflecting unit 202 and received by the radio wave receiving unit 204 when θ=φ+φ SC The purpose may be to determine the radio waves received by the virtual antenna 250 located in the black square corresponding to k. sc θ=φ+φ SC In the example shown in FIG. 6, k sc is k sc =(kcos(180°+(φ+φ SC )),ksin(180°+(φ+φ SC )))=(-kcos(φ+φ SC ),-ksin(φ+φ SC )) where k is k sc is the wave number.

[0074] 7 is an explanatory diagram for explaining an example of the flow of processing in the system 10. Here, a state in which the information processing device 300 has not acquired any measurement data is taken as the starting state.

[0075] In step (sometimes abbreviated as S) 102, the radio wave emitting unit of the antenna device 100 emits radio waves. While the antenna device 100 is emitting radio waves, the antenna device 200 receives the radio waves radiated by the antenna device 100 at a plurality of measurement angles.

[0076] For example, when the angle changing unit 208 rotates the reflecting unit 202 by one rotation relative to the radio wave receiving unit 204 while the antenna device 100 is radiating radio waves, and when AS=2°, the antenna device 200 receives the radio waves radiated by the antenna device 100 at 180 measurement angles of the reflecting unit 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, VNA 500 measures the field strength of the radio waves received by antenna device 200 while antenna device 100 is radiating radio waves in S102. For example, VNA 500 measures the field strength of the radio waves reflected by reflector 202 and received by radio wave receiving unit 204 when θ = -180°, the field strength of the radio waves reflected by reflector 202 and received by radio wave receiving unit 204 when θ = -178°, the field strength of the radio waves reflected by reflector 202 and received by radio wave receiving unit 204 when θ = -176°, ..., the field strength of the radio waves reflected by reflector 202 and received by radio wave receiving unit 204 when θ = 174°, the field strength of the radio waves reflected by reflector 202 and received by radio wave receiving unit 204 when θ = 176°, and the field strength of the radio waves reflected by reflector 202 and received by radio wave receiving unit 204 when θ = 178°.

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

[0079] In S108, the information processing device 300 performs a basis conversion process on each of the plurality of measurement data acquired from the VNA 500 in S106. For example, in order to perform a basis conversion process on the measurement data, the information processing device 300 determines φ, which is the central measurement angle of the plurality of measurement angles of the reflecting unit 202 corresponding to the plurality of measurement data. Thereafter, the information processing device 300 performs a basis conversion process on each of the plurality of measurement data using the following formula:

[0080]

number

[0081] E V (φ+θ n ) is the angle radiated by the antenna device 100 and measured at the reflector 202, φ+θ n is the electric field intensity of the vertically polarized component of the radio wave received by the radio wave receiving unit 204 when E H (φ+θ n ) is the angle radiated by the antenna device 100 and measured at the reflector 202, φ+θn is the electric field strength of the horizontally polarized component of the radio wave received by the radio wave receiving unit 204 when E Rx1 (φ+θ n ) is the angle radiated by the antenna device 100 and measured at the reflector 202, φ+θ n The electric field strength of the radio wave received by the radio wave receiving unit 204 when E is included in the measurement data measured by the VNA 500. Rx2 (φ+θ n ) is the electric field strength of the radio wave measured at terminal 2 of the VNA 500, included in the measurement data. n is n×AS.

[0082] In S110, the information processing device 300 selects, from the plurality of pieces of measurement data on which the basis conversion process has been performed in S108, a plurality of pieces of measurement data to be used for determining radio waves radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is the target rotation angle. For example, from the 180 pieces of measurement data on which the basis conversion process has been performed, the information processing device 300 selects measurement data centered on measurement data that measure the field intensity of radio waves radiated by the antenna device 100 and received by the radio wave receiving unit 204 when the measurement angle of the reflector 202 is φ.

[0083] For example, the information processing device 300 may collect measurement data of the field strength of radio waves 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+θ1, measurement data of the field strength of radio waves 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+θ2, ..., measurement data of the field strength of radio waves 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-2 The measurement data shows the electric field strength of the radio wave received by the radio wave receiving unit 204 when the measured angle of the radio wave radiated by the antenna device 100 and the reflecting unit 202 is φ+θ N-1and measurement data obtained by measuring the field strength of the radio wave received by the radio wave receiving unit 204 when the measured angle of the reflecting unit 202 is φ+θ. N Furthermore, the information processing device 300 selects N pieces of measurement data including measurement data that measures the field intensity 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 -1 The measurement data shows the electric field strength of the radio wave received by the radio wave receiving unit 204 when the measured angle of the radio wave radiated by the antenna device 100 and 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 measured angle of the radio wave radiated by the antenna device 100 and the reflecting unit 202 is φ+θ -(N-2) The measurement data shows the electric field strength of the radio wave received by the radio wave receiving unit 204 when the measured angle of the radio wave radiated by the antenna device 100 and the reflecting unit 202 is φ+θ -(N-1) and measurement data obtained by measuring the field strength of the radio wave received by the radio wave receiving unit 204 when the measured angle of the reflecting unit 202 is φ+θ. -N The information processing device 300 selects N pieces of measurement data including measurement data that measures the field intensity of the radio waves received by the radio wave receiving unit 204 when

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

[0085] The information processing device 300 performs synthetic aperture processing based on the plurality of measurement data selected in S110, for example, by regarding radio waves reflected by the reflector 202 at one measurement angle and received by the radio wave receiving unit 204 as radio waves received by the virtual antenna 250, thereby determining radio waves radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is the target rotation angle. The information processing device 300 performs synthetic aperture processing based on the plurality of measurement data selected in S110, for example, by regarding radio waves reflected by the reflector 202 at multiple measurement angles and received by the radio wave receiving unit 204 as radio waves received by the virtual array 270 configured with the plurality of virtual antennas 250, thereby determining radio waves radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is the target rotation angle. The information processing device 300 performs synthetic aperture processing using, for example, the following formula:

[0086]

number

[0087]

number

[0088] The information processing device 300 may determine the electric field intensity 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 reflector 202 is the target rotation angle. In this case, the above-described formula for synthetic aperture processing is modified as shown in the following formula.

[0089]

number

[0090]

number

[0091] In the above synthetic aperture processing formula, k SC ·R n is k SC and R n k SC ·R n is k SC ·R n = kRcosα, where α is the SC and R n It is the angle between

[0092] As shown in the synthetic aperture processing formula above, k SC and Rn contains φ. Therefore, k SC and R n Even if φ included in k is omitted, SC and R n Since the angle α between the SC ·R n The value of does not change. From the above, the above formula for synthetic aperture processing may be modified as shown in the following formula.

[0093]

number

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

[0095] where φ=0°, AS=2°, and φ step =0.1°, the information processing device 300 SC An example of a process for determining radio waves radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is each of a plurality of target rotation angles by scanning the target rotation angle will be described below. 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 device 300 calculates φ SC =0.1°, the information processing device 300 determines the radio waves that are radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is 0.1°. SC φ stepBy scanning only φ, the radio waves 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° are determined. SC By scanning the azimuth angle, the radio waves 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° are determined.

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

[0098] The applicant has developed a so-called "rotating reflector antenna," in which a parabolic reflector is rotated relative to a primary radiator whose position and angle are fixed, thereby changing the rotation angle of the reflector and receiving radio waves reflected by the reflector with the primary radiator. One advantage of a rotating reflector antenna is that it can quickly determine the direction of arrival of radio waves by rotating the reflector. On the other hand, when using a rotating reflector antenna to receive short-wavelength radio waves such as those in the terahertz and high SHF bands, a large-aperture parabolic reflector is required to narrow the beamwidth of the radio waves received by the primary radiator. Large-aperture parabolic reflectors tend to be expensive to manufacture. Furthermore, due to the processing limitations of machining equipment, it may not be possible to manufacture large-aperture parabolic reflectors. In addition, to precisely determine the direction of arrival of radio waves using a rotating reflector antenna, the angle interval of the reflector's rotation when reflecting external radio waves must be finely adjusted to acquire a large number of measurement data. As a result, when determining the direction of arrival of radio waves with high precision using a rotating reflector antenna, it is not possible to determine the direction of arrival of radio waves in a short measurement time. For these reasons, it is desirable to realize an antenna that can receive short-wavelength radio waves with a narrow beam width at low manufacturing cost, and to be able to determine the direction of arrival of radio waves with high precision in a short measurement time.

[0099] In contrast, according to the system 10 of this embodiment, the antenna device 200 receives radio waves from the antenna device 100 by rotating the plate-shaped reflector 202 relative to the radio wave receiving unit 204 to change the rotation angle of the reflector 202. Because the reflector 202 is plate-shaped, a commercially available flat reflector or the like can be used as the reflector 202. Furthermore, by increasing the distance between the reflector 202 and the radio wave receiving unit 204, a large antenna aperture can be achieved without special processing. Therefore, compared to a rotating reflector antenna having a parabolic reflector, the antenna device 200 having the plate-shaped reflector 202 can achieve a large antenna aperture, which is necessary to receive short-wavelength radio waves with a narrow beam width, at a lower manufacturing cost. Furthermore, according to the system 10 of this embodiment, the information processing device 300 determines the radio waves radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is a target rotation angle, based on multiple measurement data measured by the antenna device 200 receiving the radio waves radiated by the antenna device 100 at multiple measurement angles of the reflector 202. By determining the radio waves received by the antenna device 200 when the rotation angle of the reflector 202 is the target rotation angle based on the multiple measurement data, the information processing device 300 can accurately determine the arrival direction of the radio waves using a small number of measurement data. Therefore, the system 10 of this embodiment can accurately determine the arrival direction of the radio waves in a short measurement time. As described above, the system 10 of this embodiment can realize an antenna capable of receiving short-wavelength radio waves with a narrow beamwidth at low manufacturing cost and can accurately determine the arrival direction of the radio waves in a short measurement time.

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

[0101] Here, the simulation conditions are AS=2° and φ step = 1°. In this case, the information processing device 300 acquires measurement data measuring the field strength of radio waves reflected by the reflecting unit 202 and received by the radio wave receiving unit 204 when θ = -180°, measurement data measuring the field strength of radio waves reflected by the reflecting unit 202 and received by the radio wave receiving unit 204 when θ = -178°, ... Furthermore, the information processing device 300 executes synthetic aperture processing to determine radio waves reflected by the reflecting unit 202 and received by the radio wave receiving unit 204 when θ = -179°, radio waves reflected by the reflecting unit 202 and received by the radio wave receiving unit 204 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 vertical polarization component of the radio wave received by the radio wave receiving unit 204. The thin line in the graph shown in Fig. 8 is the simulation result when synthetic aperture processing is not performed. The thick line in the graph shown in Fig. 8 is the simulation result when synthetic aperture processing is performed.

[0103] In the simulation results when synthetic aperture processing is not performed, it is only possible to determine that the rotation angle of the reflector 202 when the radio waves radiated by the antenna device 100 arrive at the antenna device 200 with the maximum field strength is in the range of 0° to 2°. In contrast, in the simulation results when synthetic aperture processing is performed, it is possible to determine that the rotation angle of the reflector 202 when the radio waves radiated by the antenna device 100 arrive at the antenna device 200 with the maximum field strength is 1°. Therefore, as shown by the simulation results, the system 10 according to this embodiment can determine the direction of arrival of the radio waves with high precision using a small amount of measurement data by performing synthetic aperture processing.

[0104] 9 schematically illustrates an example of the functional configuration of the information processing device 300. The information processing device 300 includes an acquisition unit 302, a storage unit 304, a determination unit 306, and a selection unit 308. Note that it is not essential that the information processing device 300 includes all of these components.

[0105] The acquiring unit 302 acquires various types of data. For example, the acquiring unit 302 acquires measurement data from the VNA 500. For example, the acquiring unit 302 acquires angle data from the angle controller 400. The acquiring unit 302 may store the acquired various types of data in the storage unit 304.

[0106] The acquiring unit 302 acquires, for example, a plurality of pieces of measurement data measured by the antenna device 200 receiving radio waves radiated by the antenna device 100 at one measurement angle of the reflecting unit 202. The acquiring unit 302 acquires, for example, a plurality of pieces 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.

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

[0108] The determination unit 306 determines the radio waves radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is the target rotation angle, for example, by performing a basis conversion process on each piece of the plurality of measurement data. For example, the determination unit 306 determines φ, which is the center measurement angle of the plurality of measurement angles of the reflector 202 corresponding to the plurality of measurement data. Then, the determination unit 306 performs a basis conversion process on each piece of the plurality of measurement data using the above-mentioned formula.

[0109] For example, the determination unit 306 determines the radio waves that are radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is the target rotation angle, based on radio waves obtained by combining radio waves that are radiated by the antenna device 100 and received by the antenna device 200 at a plurality of measurement angles of the reflector 202. The determination unit 306 determines the radio waves that are radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is the target rotation angle, for example, by performing synthetic aperture processing based on the plurality of measurement data and regarding the radio waves reflected by the reflector 202 and received by the radio wave receiver 204 as radio waves received by the virtual antenna 250. The determination unit 306 performs synthetic aperture processing based on the plurality of measurement data, for example, to consider the radio waves reflected by the reflecting unit 202 at the plurality of measurement angles and received by the radio wave receiving unit 204 as radio waves received by a virtual array 270 configured with the plurality of virtual antennas 250, thereby determining 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. The determination unit 306 performs synthetic aperture processing using, for example, the above-mentioned formula.

[0110] The determination unit 306 determines, for example, radio waves radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is each of a plurality of target rotation angles. The determination unit 306 determines, for example, radio waves radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is each of a plurality of target rotation angles at predetermined angular intervals. The determination unit 306 determines, for example, φ SC By scanning the angle φ, the determination unit 306 determines the radio wave that is radiated by the antenna device 100 and received by the antenna device 200 when the rotation angle of the reflector 202 is each of the target rotation angles. SC Scan the.

[0111] The selection unit 308 selects a plurality of measurement data used to determine radio waves that are 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. The determination unit 306 may determine, based on the plurality of measurement data selected by the selection unit 308, radio waves that are 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.

[0112] The selection unit 308 selects, for example, from the plurality of measurement data stored in the storage unit 304, which are measured by the antenna device 200 receiving radio waves radiated by the antenna device 100 while rotating the reflecting unit 202 relative to the radio wave receiving unit 204 one or more times. The selection unit 308 selects, for example, the plurality of measurement data to be used for determining 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 selecting measurement data mainly based on measurement data that measure the field intensity of radio waves 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.

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

[0114] 10 schematically illustrates an example of the hardware configuration of a computer 1200 functioning as the information processing device 300. A program installed on the computer 1200 can cause the computer 1200 to function as one or more "units" of an apparatus according to the present embodiment, or can cause the computer 1200 to execute operations associated with the apparatus according to the present embodiment or one or more "units," and / or can cause the computer 1200 to execute a process according to the present embodiment or steps of the process. Such a program can be executed by the CPU 1212 to cause the computer 1200 to perform specific operations associated with some or all of the blocks in the flowcharts and block diagrams described herein.

[0115] The computer 1200 according to this embodiment includes a CPU 1212, a RAM 1214, and a graphics controller 1216, which are interconnected by a host controller 1210. The computer 1200 also includes input / output units such as a communications 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 a ROM 1230 and legacy input / output units such as 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 graphics controller 1216 acquires image data generated by the CPU 1212 into a frame buffer or the like provided in the RAM 1214 or into the graphics controller 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 in the computer 1200. The DVD drive 1226 reads programs or data from a DVD-ROM 1227 or the like and provides them 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] The ROM 1230 stores therein a boot program or the like that is executed by the computer 1200 upon activation, and / or programs that depend on the hardware of the computer 1200. The input / output chip 1240 may also connect various input / output units to the input / output controller 1220 via a USB port, a parallel port, a serial port, a keyboard port, a mouse port, etc.

[0119] The programs are provided by a computer-readable storage medium such as a DVD-ROM 1227 or an IC card. The programs are read from the computer-readable storage medium, installed in the storage device 1224, RAM 1214, or ROM 1230, which are also examples of computer-readable storage media, and executed by the CPU 1212. Information processing described in these programs is read by the computer 1200, and causes cooperation between the programs and the various types of hardware resources described above. An apparatus or method may be configured by implementing operations or processing of information in accordance with the use of the computer 1200.

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

[0121] Furthermore, the CPU 1212 may cause all or a necessary portion 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 perform various types of processing on the data on the RAM 1214. The CPU 1212 may then 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 on the recording medium and may undergo information processing. The CPU 1212 may perform various types of processing on data read from the RAM 1214, including various types of operations, information processing, conditional judgment, conditional branching, unconditional branching, information search / replacement, etc., as described throughout this disclosure and specified by the instruction sequences of the programs, and write the results back to the RAM 1214. The CPU 1212 may also search for information in a file, database, etc. on the recording medium. For example, if multiple entries, each having an attribute value of a first attribute associated with an attribute value of a second attribute, are stored on the recording medium, the CPU 1212 may search for an entry whose attribute value of the first attribute matches a specified condition from among the multiple entries, read the attribute value of the second attribute stored in the entry, and thereby obtain the attribute value of the second attribute associated with the first attribute that satisfies a predetermined condition.

[0123] The above-described programs or software modules may be stored in a computer-readable storage medium on or near the computer 1200. 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 also be used as a computer-readable storage medium, thereby providing the programs to the computer 1200 via the network.

[0124] The blocks in the flowcharts and block diagrams in the present embodiments may represent stages of a process in which an operation is performed or "parts" of an apparatus responsible for performing the operation. Particular stages and "parts" may be implemented by dedicated circuitry, programmable circuitry provided with computer-readable instructions stored on a computer-readable storage medium, and / or a processor provided with computer-readable instructions stored on a computer-readable storage medium. The dedicated circuitry may include digital and / or analog hardware circuits, including integrated circuits (ICs) and / or discrete circuits. The programmable circuitry may include reconfigurable hardware circuits, such as field programmable gate arrays (FPGAs) and programmable logic arrays (PLAs), including AND, OR, XOR, NAND, NOR, and other logical operations, flip-flops, registers, and memory elements.

[0125] A computer-readable medium may include any tangible device capable of storing instructions that are executed by a suitable device, such that the computer-readable medium having instructions stored thereon comprises an article of manufacture containing instructions that can be executed to create means for performing the operations specified in the flowcharts or block diagrams. Examples of computer-readable media may include electronic, magnetic, optical, electromagnetic, and semiconductor storage media. More specific examples of computer-readable media may include floppy 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 disc read-only memory (CD-ROM), digital versatile disc (DVD), Blu-ray disc, memory stick, integrated circuit card, and the like.

[0126] The computer readable instructions may include either assembler instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state-setting data, or source or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk®, JAVA®, C++, etc., and conventional procedural programming languages ​​such as the “C” programming language or similar programming languages.

[0127] The computer-readable instructions may be provided to a processor or programmable circuit of a programmable data processing device, such as a computer, locally or via a wide area network (WAN) such as a local area network (LAN) or the Internet, and the computer-readable instructions may be executed to create means for performing the operations specified in the flowcharts or block diagrams. Here, the computer may be a personal computer (PC), a tablet computer, a smartphone, a workstation, a server computer, a general-purpose computer, a special-purpose computer, or the like, or may be a computer system in which multiple computers are connected. Such a computer system in which multiple computers are connected is also called a distributed computing system, and is a broad definition of computer. In a distributed computing system, the multiple computers collectively execute a program by each executing a portion of the program and passing data between the computers as needed during program execution.

[0128] Examples of processors include a computer processor, a central processing unit (CPU), a processing unit, a microprocessor, a digital signal processor, a controller, a microcontroller, etc. A computer may have one or more processors. In a multiprocessor system with multiple processors, each processor executes a portion of a program and passes data between processors as needed during program execution, allowing the multiple processors to collectively execute the program. For example, in multitasking, each of the multiple processors may execute a portion of each task in small chunks by switching tasks at time slice intervals. In this case, which portion of a program each processor executes changes dynamically. Which portion of a program each of the multiple processors executes may also be statically determined by multiprocessor-aware programming.

[0129] Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the claims that such modifications and improvements can also be included within 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, specifications, and drawings is not specifically stated as "before," "prior to," etc., and that the processes can be performed in any order unless the output of a previous process is used in a later process. Even if the operational flow in the claims, specifications, and drawings is described using "first," "next," etc. for convenience, this does not mean that the processes must be performed in this order. [Explanation of symbols]

[0131] 10 System, 100 Antenna device, 200 Antenna device, 202 Reflector, 204 Radio wave receiving unit, 205 Aperture surface, 206 Support unit, 208 Angle change unit, 250 Virtual antenna, 252 Aperture surface, 270 Virtual array, 300 Information processing device, 302 Acquisition unit, 304 Storage unit, 306 Determination unit, 308 Selection unit, 400 Angle controller, 500 VNA, 1200 Computer, 1210 Host controller, 1212 CPU, 1214 RAM, 1216 Graphics 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 emitting portion that emits radio waves in the terahertz wave band or a high SHF (Super High Frequency) band; a second antenna device having 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 reflecting radio waves from outside by rotating the reflecting unit relative to the radio wave receiving unit; an information processing device including: 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 unit 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 unit 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 position and angle are fixed while the second antenna device receives radio waves.

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 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 measurement angles.

4. 4. The system according to claim 3, wherein the determination unit performs synthetic aperture processing based on the plurality of measurement data, thereby regarding the radio waves reflected by the reflecting unit and received by the radio wave receiving unit as 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 reflecting unit, thereby determining the radio waves radiated by the first antenna device and received by the second antenna device when the rotation angle of the reflecting unit is the target rotation angle.

5. The determination unit performs the synthetic aperture processing using the following formula: [Equation 1] where: [Equation 2] is the electric field intensity of the vertically polarized wave 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 the central measurement angle of the plurality of measurement angles, and φ ＳＣ is the offset angle, and 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 measurement 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 one or more times relative to the radio wave receiving unit, the information processing device further includes a selection unit that selects, from a plurality of measurement data measured by the second antenna device receiving radio waves radiated by the first antenna device while rotating the reflecting unit one or more times relative to the radio wave receiving unit, the plurality 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 reflecting unit 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. The 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 waves radiated by the first antenna device at the plurality of measurement angles at predetermined first angle intervals; the determination unit determines 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 each of the plurality of target rotation angles at a predetermined second angle interval.

3. The 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 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 plurality of 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 plurality of target rotation angles.

10. an acquisition unit that acquires a plurality of measurement data measured by a second antenna device having a radio wave receiving unit, a plate-shaped reflecting unit that reflects radio waves from outside, and an angle changing unit that changes the 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 that receives radio waves in the terahertz wave band or high SHF wave band radiated by a radio wave radiating unit of a first antenna device and reflects them at the reflecting unit at a plurality of 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 that are 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; 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 plate-shaped reflecting unit that reflects radio waves from outside, and an angle changing unit that changes the rotation angle of the reflecting unit when the reflecting unit reflects radio waves from outside by rotating 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 them 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 to execute.

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 second antenna device having a radio wave receiving portion, 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 reflecting 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 that are 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:

Images