Measurement device, measurement method, and measurement program

Abstract

To calculate distortion of a measurement mechanism to measure communication performance of a communication system with high accuracy.SOLUTION: A measurement apparatus outputs a correction result obtained by performing correction on a target radio wave received by a measurement mechanism which includes an antenna for receiving the target radio wave and a support part for supporting the antenna, on the basis of distortion generated in the support part. The measurement apparatus includes a first acquisition unit, a calculation unit, a second acquisition unit, and a correction unit. The first acquisition unit acquires, on the basis of a reference positional relationship between the antenna and a target transmitting the target radio wave, a first received radio wave phase of the target radio wave received by the antenna. The calculation unit calculates, on the basis of the first received radio wave phase, an ideal received radio wave phase of the target radio wave received by the antenna, at each position of the antenna. The second acquisition unit acquires a second received radio wave phase of the target radio wave received by the antenna, at each position of the antenna. The correction unit performs correction based on distortion of the support part which is calculated from a phase difference between the ideal received radio wave phase and the second received radio wave phase.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a measurement device, a measurement method, and a measurement program. [Background technology]

[0002] Conventionally, there is known a system that receives radio waves emitted from a communication system mounted on an object such as a mobile phone or a vehicle with an antenna and measures the communication performance of the communication system based on the received radio waves (see, for example, Patent Document 1). When the object to be measured is large, the measurement system is enlarged and radio waves are received while moving the antenna with a movable part of the measurement system. Also, a distortion detection device that detects distortion of a mechanism is known (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2019-505768 [Patent Document 2] Japanese Patent Application Publication No. 5-302817 Summary of the Invention [Problem to be solved by the invention]

[0004] However, for example, in the case of a large measurement system equipped with a measurement mechanism made of a non-metallic material, distortion may occur in the measurement mechanism. The detection device detects distortion by irradiating a laser beam, but when a distortion detection device is applied to a conventional measurement system, the distortion detection device using the laser beam becomes a reflector of the radio waves to be measured, and the distortion detection device using the laser beam becomes an obstacle to the measurement, making it difficult to measure the communication performance of the communication system with high accuracy. In other words, when a measurement device that measures radio waves is equipped with a large measurement mechanism, there is room for improvement in detecting distortion of the mechanism.

[0005] The present disclosure provides a measurement device, a measurement method, and a measurement program that are capable of calculating distortion of a measurement mechanism and performing highly accurate measurement of the communication performance of a communication system. [Means for solving the problem]

[0006] The measuring device according to the present disclosure comprises: The first one originates from the first subject. In a measurement mechanism including an antenna for receiving a target radio wave and a support for supporting the antenna, 1. The measurement device includes a first acquisition unit, a calculation unit, a second acquisition unit, and a correction unit. The first acquisition unit acquires the antenna, 1. Based on the positional relationship of the target reference , the first The calculation unit obtains a first received radio wave phase indicating a phase of the radio wave received by the antenna. The calculation unit calculates a first received radio wave phase for each position of the antenna based on the first received radio wave phase. , the first The second acquisition unit calculates an ideal received radio wave phase indicating the phase of an ideal radio wave received by the antenna for each position of the antenna. , the first A second received radio wave phase indicating the phase of the radio wave received by the antenna is acquired. A correction unit performs correction based on distortion information indicating distortion of the support portion calculated from a phase difference indicating the difference between the ideal received radio wave phase calculated by the calculation unit and the second received radio wave phase acquired by a second acquisition unit. Effect of the Invention

[0007] According to the measurement device, measurement method, and measurement program of the present disclosure, it is possible to calculate the distortion of a measurement mechanism and perform highly accurate measurement of the communication performance of a communication system. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing an example of a measurement system according to the first embodiment. [Diagram 2] FIG. 2 is a hardware configuration diagram illustrating an example of the measurement device according to the first embodiment. [Diagram 3] FIG. 3 is a functional block diagram illustrating an example of the measurement device according to the first embodiment. [Figure 4] FIG. 4 is a diagram illustrating an example of distance information between the antenna and the target according to the first embodiment. [Diagram 5] FIG. 5 is a flowchart showing an example of the flow of processing executed by the measurement device according to the first embodiment. [Figure 6] FIG. 6 is a flowchart showing an example of the flow of processing executed by the measurement device according to the first embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of position coordinates of an antenna and a target according to the second embodiment. [Figure 8] FIG. 8 is a flowchart showing an example of the flow of processing executed by the measurement device according to the second embodiment. [Figure 9] FIG. 9 is a flowchart showing an example of the flow of processing executed by the measurement device according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of a measurement device, a measurement method, and a measurement program according to the present disclosure will be described with reference to the accompanying drawings.

[0010] (First embodiment) 1 is a schematic diagram showing an example of a measurement system 1 according to the first embodiment. The measurement system 1 includes a measurement device 10, a measurement mechanism 20, and a reference wave source 40.

[0011] The measurement system 1 is a system for measuring the communication performance of a communication system 30 mounted on a target.

[0012] The target is an object that transmits a target radio wave. The target may be anything that can be equipped with the communication system 30. The target may be, for example, a vehicle T, a flying object such as an airplane, a ship, a structure such as a building, a mobile terminal, an electronic device such as a personal computer, etc. In this embodiment, a form in which the target is a vehicle T will be described as an example.

[0013] The communication system 30 is a radio wave transmitter that wirelessly transmits the measurement target radio waves 52. In other words, the communication system 30 is a radio wave transmitter that transmits the measurement target radio waves 52 into the air. The communication system 30 is, for example, a cordless telephone device, a wireless communication device such as a Wi-Fi (Wireless Fidelity) router, a radar transmitter, etc. In addition, the communication system 30 is, for example, various transmitters used for tracking, detection, communication, etc.

[0014] The radio waves 52 to be measured are radio waves wirelessly transmitted from the communication system 30. The radio waves 52 to be measured are radio waves to be measured in the measurement system 1 of this embodiment. The radio waves 52 to be measured may be any of millimeter waves, microwaves, ultra-high frequency radio waves, ultra-high frequency radio waves, short waves, medium waves, and long waves. Millimeter waves are radio waves in the millimeter wave frequency band of 26 GHz or higher. Millimeter waves are used in mobile communication systems such as 5G (fifth generation mobile communication system), autonomous driving technology for vehicle T, ADAS (Advanced Driver Assistance System) technology, and the like. Radio waves used in ADAS technology include, for example, radar waves.

[0015] In this embodiment, the communication system 30 is mounted on a vehicle T, which is an example of a target. In this embodiment, a form in which the communication system 30 is mounted inside the vehicle T will be described as an example.

[0016] The measurement mechanism 20 is a mechanism for receiving the measurement target radio waves 52 transmitted from the communication system 30 mounted on the vehicle T. The measurement mechanism 20 is configured to be at least partially movable so that the measurement target radio waves 52 can be received at each of the positions in all directions of the vehicle T.

[0017] In detail, the measurement mechanism 20 includes an antenna 21, a support portion 22, a support portion 23, and a support portion 24.

[0018] The antenna 21 is a device for receiving and transmitting radio waves via radio waves. In other words, the antenna 21 emits radio waves into the air and receives radio waves that have propagated through the air.

[0019] The antenna 21 is supported by a support portion 24. The support portion 24 is a rod-shaped member. One end of the support portion 24 in the longitudinal direction supports the antenna 21, and the other end is supported by the support portion 23. In this embodiment, a form in which the support portion 24 is arranged so that the longitudinal direction of the support portion 24 and a direction intersecting the vertical direction approximately coincide with each other will be described as an example.

[0020] The support portion 23 is a rod-shaped member. In this embodiment, a form in which the support portion 23 is arranged so that the longitudinal direction of the support portion 23 and the vertical direction are approximately aligned will be described as an example. One end of the support portion 23 in the longitudinal direction is supported by the support portion 22. The support portion 22 is a rod-shaped member that is arranged on the ground or the like. In this embodiment, a form in which the longitudinal direction of the support portion 22 is approximately aligned with the horizontal direction will be described as an example.

[0021] The support part 25 is a member that supports the vehicle T. In this embodiment, the support part 25 is a disk-shaped member. In this embodiment, the disk-shaped surface of the support part 25 is arranged so as to be oriented along the horizontal direction. A drive part 25A is provided at the center of the circle of the support part 25. The drive part 25A is driven under the control of the measuring device 10 described later. Drive of the drive part 25A causes the support part 25 to rotate at a predetermined angle around the center of the circle as the center of rotation (in the direction of arrow Q). With the rotation of the support part 25, the vehicle T placed on the support part 25 rotates (in the direction of arrow Q). Note that the arrow Q in FIG. 1 in which the support part 25 rotates may be in the opposite direction to the arrow Q.

[0022] Support section 23 is provided with drive section 23A. Support section 24 is provided with drive section 24A. Drive sections 23A and 24A are driven under the control of measuring device 10, which will be described later. Drive section 23A moves support section 23 along the longitudinal direction of support section 22 (arrow X direction). Drive section 24A moves support section 24 along the longitudinal direction of support section 23 (arrow Z direction).

[0023] Antenna 21 supported by support unit 24 is supported so as to be movable in a direction approaching or moving away from vehicle T in the vertical direction and in a direction intersecting the vertical direction, by driving of drive units 23A and 24A. In other words, antenna 21 is supported so as to be movable between the apex of a hemisphere C with vehicle T as the spherical center and the peripheral portion of hemisphere C, by driving of drive units 23A and 24A.

[0024] The reference wave source 40 is a radio wave transmission source used to calculate the distortion of the measurement mechanism 20. The reference wave source 40 is installed at the center of the support portion 25. The radio waves transmitted from the reference wave source 40 are radio waves with known wavelengths, periods, and amplitudes. The reference wave source 40 is, for example, a dipole antenna. In this embodiment, the distortion of the measurement mechanism 20 is described for the support portion 23, but is not limited to this. Also, in this embodiment, a form in which the target is the reference wave source 40 in addition to the above-mentioned vehicle T will be described as an example.

[0025] The radio wave 50 emitted from the reference wave source 40 is a constant radio wave whose wavelength, period, and amplitude do not change over time. Period means the number of vibrations or frequency.

[0026] Next, the measurement device 10 will be described. The measurement device 10 is a device that measures the communication performance of the communication system 30 based on a measurement target radio wave 52 of the communication system 30 received by an antenna 21. The measurement device 10 outputs a correction result obtained by correcting the target radio wave received by a measurement mechanism 20 including an antenna 21 that receives the target radio wave and a support section 24 that supports the antenna 21, based on distortion occurring in the support section 24. The measurement device 10 will be described in detail later.

[0027] (Example of hardware configuration of measuring device) Fig. 2 is a diagram showing an example of a hardware configuration of the measurement device 10 according to this embodiment. As shown in Fig. 2, the measurement device 10 has a CPU (Central Processing Unit) 11, a ROM (Read Only Memory) 12, a RAM (Random Access Memory) 13, an auxiliary storage device 14, and an external I / F (Interface) 15, which are connected to each other via a bus 16, and has a hardware configuration using a normal computer.

[0028] The CPU 11 is a calculation device that controls the measuring device 10. The CPU 11 is an example of a processor in the measuring device 10 of this embodiment, and another processor or processing circuit may be provided instead of the CPU 11. The ROM 12 is a non-volatile memory, and stores various data including a program for starting up the measuring device 10 (information written during the manufacturing stage of the measuring device 10).

[0029] The RAM 13 is, for example, a main storage device of the measuring device 10, and stores data necessary for various processes by the CPU 11. The auxiliary storage device 14 stores various data, such as programs executed by the CPU 11. The auxiliary storage device 14 is, for example, configured with a hard disk drive (HDD) or a solid state drive (SSD). The external I / F 15 is an interface for transmitting and receiving data. The external I / F 15 is also an interface for connecting (communicating) with external devices such as the antenna 21, the drive unit 23A, the drive unit 24A, the drive unit 25A, the communication system 30, and the reference wave source 40.

[0030] (Example of measuring device functions) Fig. 3 is a block diagram showing an example of functions of the measurement device 10 according to this embodiment. As shown in Fig. 3, the measurement device 10 according to this embodiment includes a measurement unit 101, a transmission control unit 102, a first acquisition unit 103, a drive control unit 104, a second acquisition unit 105, a calculation unit 106, a third acquisition unit 107, and a correction unit 108. The functions of the measurement device 10 are not limited to these.

[0031] The measurement unit 101 measures the reference positional relationship between the antenna 21 and the communication system 30. In detail, the antenna 21 is placed on the support part 24, the communication system 30 is placed on the support part 25, and the positions of the placed antenna 21 and communication system 30 are measured. For example, the reference positional relationship includes coordinates indicating the positions of the antenna 21 and the communication system 30, and a distance connecting the antenna 21 and the communication system 30. The measurement unit 101 stores the measured reference positional relationship in the auxiliary storage device 14.

[0032] The measurement unit 101 also measures the reference positional relationship between the antenna 21 and the reference wave source 40. In detail, the antenna 21 is placed on the support unit 24, the reference wave source 40 is placed at the center of the support unit 25 as a reference, and the positions of the placed antenna 21 and reference wave source 40 are measured. For example, the reference positional relationship includes coordinates indicating the positions of the antenna 21 and the reference wave source 40, and the distance connecting the antenna 21 and the reference wave source 40. The measurement unit 101 stores the measured reference positional relationship in the auxiliary storage device 14.

[0033] The transmission control unit 102 controls the start and stop of transmission of radio waves from the communication system 30 and the reference wave source 40 .

[0034] In detail, the transmission control unit 102 cooperates with the external I / F 15 to transmit to the communication system 30 a transmission start signal indicating the start of transmission of the measurement target radio waves 52. The communication system 30 that has received the transmission start signal of the measurement target radio waves 52 starts wirelessly transmitting the measurement target radio waves 52. The transmission control unit 102 also cooperates with the external I / F 15 to transmit to the communication system 30 a transmission stop signal indicating the stop of transmission of the measurement target radio waves 52. The communication system 30 that has received the transmission stop signal of the measurement target radio waves 52 stops transmitting the measurement target radio waves 52.

[0035] Furthermore, the transmission control unit 102 cooperates with the external I / F 15 to transmit to the reference wave source 40 a transmission start signal indicating the start of transmission of the transmitted radio waves 50. Upon receiving the transmission start signal for the transmitted radio waves 50, the reference wave source 40 begins wirelessly transmitting the transmitted radio waves 50. Furthermore, the transmission control unit 102 cooperates with the external I / F 15 to transmit to the reference wave source 40 a transmission stop signal indicating the stop of transmission of the transmitted radio waves 50. Upon receiving the transmission stop signal for the transmitted radio waves 50, the reference wave source 40 stops transmitting the transmitted radio waves 50.

[0036] The communication system 30 and the reference wave source 40 may be configured to switch between starting and stopping the transmission of the transmission radio wave 50 and starting and stopping the transmission of the measurement target radio wave 52 in response to an operational instruction or the like from a user.

[0037] The first acquisition unit 103 acquires a first received radio wave phase indicating the phase of the target radio wave received by the antenna 21 from the target radio wave transmitted from the target based on a reference positional relationship between the antenna 21 and the target transmitting the target radio wave.

[0038] In detail, first, when the reference wave source 40 starts transmitting radio waves by the transmission control unit 102, the first acquisition unit 103 starts receiving the transmitted radio waves 50 at the antenna 21. Furthermore, the first acquisition unit 103 receives at the antenna 21 the transmitted radio waves 50 transmitted from the reference wave source 40 that has received a transmission start signal for the transmitted radio waves 50 transmitted by the transmission control unit 102, based on the reference positional relationship in which the antenna 21 and the reference wave source 40 are arranged.

[0039] Furthermore, when the transmission control unit 102 stops transmitting radio waves from the reference wave source 40, the first acquisition unit 103 stops receiving the transmitted radio waves 50 at the antenna 21. Then, the first acquisition unit 103 acquires a first received radio wave phase indicating the phase of the transmitted radio waves 50 received at the antenna 21. Furthermore, the first acquisition unit 103 stores the acquired first received radio wave phase in the auxiliary storage device 14. Note that the first acquisition unit 103 may store the first transmitted radio wave received at the antenna 21 in the auxiliary storage device 14 every time it receives the first transmitted radio wave.

[0040] The drive control unit 104 controls the drive of the drive unit 23A, the drive unit 24A, and the drive unit 25A. For example, the drive control unit 104 drives the drive unit 23A, the drive unit 24A, and the drive unit 25A so that the antenna 21 is sequentially arranged in each region obtained by dividing the outer periphery of a hemisphere C (see FIG. 1) centered on the vehicle T into a plurality of regions.

[0041] In detail, the drive control unit 104 cooperates with the drive units 23A and 24A to control the drive unit 25A each time the position of the antenna 21 is controlled and moved to the next measurement position between the apex of the hemisphere C and the periphery of the hemisphere C. By controlling the drive unit 25A, the drive control unit 104 drives and rotates the vehicle T placed on the support unit 25 by a predetermined rotation angle.

[0042] In the measurement device 10, the antenna 21 is moved to the next measurement position by drive control of the drive control unit 104, and the communication performance of the communication system 30 is derived using the received measurement radio waves of the measurement target radio waves 52 received by the antenna 21 every time the vehicle T placed on the support unit 25 is rotated and driven by a predetermined rotation angle. That is, the measurement device 10 is configured to be capable of acquiring the received measurement radio waves received in each of a plurality of regions obtained by dividing the outer periphery of a hemisphere C centered on the vehicle T. In other words, the measurement device 10 is configured to be capable of acquiring the received measurement radio waves received at each position in all directions of the vehicle T.

[0043] The second acquisition unit 105 acquires a second received radio wave phase indicating the phase of a target radio wave transmitted from a target and received by the antenna 21.

[0044] In detail, first, when the reference wave source 40 starts transmitting radio waves by the transmission control unit 102, the second acquisition unit 105 starts receiving the transmitted radio waves 50 at the antenna 21. Furthermore, the second acquisition unit 105 receives, at the antenna 21, the transmitted radio waves 50 transmitted from the reference wave source 40 that has received a transmission start signal for the transmitted radio waves 50 transmitted by the transmission control unit 102, each time the position of the antenna 21 is controlled and moved to the next measurement position between the apex of the hemisphere C and the periphery of the hemisphere C by the drive control of the drive control unit 104 in cooperation with the drive units 23A and 24A.

[0045] Furthermore, when the transmission control unit 102 stops transmitting radio waves from the reference wave source 40, the second acquisition unit 105 stops receiving the transmitted radio waves 50 at the antenna 21. Then, the second acquisition unit 105 acquires a second received radio wave phase indicating the phase of the transmitted radio waves 50 received at the antenna 21. Furthermore, the second acquisition unit 105 stores the acquired second received radio wave phase in the auxiliary storage device 14. Note that the second acquisition unit 105 may store the second transmitted radio wave received at the antenna 21 in the auxiliary storage device 14 every time it receives the second transmitted radio wave.

[0046] The calculation unit 106 calculates, based on the first received radio wave phase acquired by the first acquisition unit 103, an ideal received radio wave phase indicating the phase of an ideal radio wave received by the antenna 21 from a target radio wave transmitted from a target, for each position of the antenna 21.

[0047] In detail, when the calculation unit 106 acquires the first received radio wave phase acquired by the first acquisition unit 103, the calculation unit 106 calculates the transmission / reception distance with the target for each position of the antenna 21. The calculation unit 106 calculates an ideal received radio wave phase indicating the phase of an ideal radio wave when the target radio wave transmitted from the target is received by the antenna 21 for each position of the antenna 21, based on the distance connecting the antenna 21 and the reference wave source 40 measured by the measurement unit 101 (hereinafter also referred to as the reference distance of the reference position) and the calculated transmission / reception distance.

[0048] Here, the ideal received radio wave phase will be described with reference to FIG. 4. For convenience, in the drawings described below, an X-axis and a Z-axis perpendicular to each other are shown, and the left-right direction (X-direction) and the up-down direction (Z-direction) in the measurement mechanism 20 of the embodiment will be described using the X-axis and the Z-axis. In the following description, when simply described as the X-direction or the Z-direction, it refers to the respective axial direction, and includes two opposite directions. When the positive direction of the X-axis is specified, it is one direction from the right side to the left side, and when the positive direction of the Z-axis is specified, it is one direction from the bottom to the top.

[0049] When the support 23 is not distorted, the antenna 21 (X0, Z0) indicating the reference position coordinates and the reference wave source 40 (X r ,Z r) does not change. If the measured distance from antenna 21 to reference wave source 40 does not change, there will be no change in the phase characteristics of the radio wave received by antenna 21. The phase of the received radio wave that does not change is called the ideal received radio wave phase. The ideal received radio wave phase is also called the theoretical phase. The theoretical phase is derived using the following formula 1. R0 [m] indicates the reference distance between the reference positions of antenna 21 and reference wave source 40. R [m] indicates the transmitting / receiving distance between antenna 21 and reference wave source 40 when no distortion occurs. S0 [deg] indicates the phase of the reference positions of antenna 21 and reference wave source 40. λ [m] indicates the wavelength.

[0050]

number

[0051] Furthermore, the calculation unit 106 calculates distortion information indicating distortion of the support unit 23 from a phase difference indicating the difference between the calculated ideal received radio wave phase and the second received radio wave phase acquired by the second acquisition unit 105. The distortion information includes distance information indicating the distance between the antenna 21 and the target.

[0052] When the support section 23 is large, distortion may occur in a part of the support section 23. Here, distance information included in the distortion information indicating the distortion of the support section 23 will be described with reference to FIG.

[0053] First, the position coordinates (X t , Z t ) is shown. The position coordinates (X α ,Z α ) When the support 23 is distorted, the measured distance between the antenna 21 and the reference wave source 40, which is derived from the reference position coordinates, changes. When the measured distance changes, the phase characteristics of the radio waves received by the antenna 21 change. In other words, the measured phase, which indicates the phase of the received radio waves, differs from the theoretical phase.

[0054] The calculation unit 106 calculates the phase difference S, which indicates the difference between the measured phase and the theoretical phase, = (measured phase) - (theoretical phase), to calculate the distance information L1 included in the following distortion information. The distance information L1 can be expressed by the following formula 2.

[0055]

number

[0056] Thereby, the calculation section 106 calculates the phase difference S, whereby the distortion information of the support section 23 can be calculated.

[0057] Returning to Fig. 3, the third acquiring unit 107 acquires a received measurement radio wave indicating a measurement radio wave received by the antenna 21 from the measurement target radio wave 52 transmitted from the target.

[0058] In detail, first, when the transmission control unit 102 starts transmitting radio waves from the communication system 30, the third acquisition unit 107 starts receiving the measurement radio waves at the antenna 21. Moreover, the third acquisition unit 107 receives, at the antenna 21, the measurement target radio waves 52 transmitted from the communication system 30 mounted on the vehicle T placed on the support unit 25 which is rotationally driven by the drive control unit 104 by a predetermined rotation angle each time the position of the antenna 21 is controlled and moved to the next measurement position between the apex of the hemisphere C and the periphery of the hemisphere C in cooperation with the drive units 23A and 24A by the drive control of the drive control unit 104.

[0059] Furthermore, when the transmission control unit 102 stops transmitting radio waves from the communication system 30, the third acquisition unit 107 stops receiving the measurement radio waves at the antenna 21. Then, the third acquisition unit 107 acquires the received measurement radio waves received at the antenna 21. Moreover, the third acquisition unit 107 stores the acquired received measurement radio waves in the auxiliary storage device 14.

[0060] The correction unit 108 performs correction based on distortion information indicating the distortion of the support unit 23 calculated from the phase difference S indicating the difference between the ideal received radio wave phase calculated by the calculation unit 106 and the second received radio wave phase acquired by the second acquisition unit 105.

[0061] In detail, the correction unit 108 corrects the received measurement radio wave acquired by the third acquisition unit 107, based on the distance information L1 included in the distortion information calculated by the calculation unit 106. For example, the correction unit 108 corrects at least one of the amplitude and the phase of the received measurement radio wave.

[0062] Here, the details of correcting the amplitude and phase of the received measurement radio wave will be described.

[0063] The amplitude of the received measurement radio wave is the amplitude of the power of the received measurement radio wave. The correction unit 108 adds a correction value derived from the distance information L1 of the distortion of the support unit 23 calculated by the calculation unit 106, the transmission-reception distance R between the antenna 21 and the reference wave source 40 when no distortion occurs, and the free space propagation loss, to the received measurement radio wave acquired by the third acquisition unit 107, to correct the amplitude of the power of the received measurement radio wave. The correction unit 108 stores the corrected amplitude of the power of the received measurement radio wave in the auxiliary storage device 14. The correction value can be expressed by the following equation 3.

[0064]

number

[0065] Furthermore, the correction unit 108 adds a phase correction value = S × f2 / f1 consisting of the phase difference S calculated by the calculation unit 106, the frequency f1 of the reference wave source 40, and the frequency f2 of the communication system 30 to the received measurement radio wave acquired by the third acquisition unit 107, to correct the phase of the received measurement radio wave. The correction unit 108 stores the corrected phase of the received measurement radio wave in the auxiliary storage device 14.

[0066] This allows highly accurate measurements to be performed by correcting the measurement results using the calculated phase difference S.

[0067] Next, an example of the flow of processing executed by the measurement device 10 of the first embodiment will be described.

[0068] Fig. 5 is a flowchart showing an example of the flow of processing executed by the measurement device 10. The following description will be given on the assumption that the reference wave source 40 is not emitting radio waves immediately before the flowchart shown in Fig. 5 is executed.

[0069] The measurement unit 101 measures the reference positional relationship between the antenna 21 and the reference wave source 40 (step S501).

[0070] The transmission control unit 102 transmits a transmission start signal, which indicates the start of transmission of the transmission radio wave 50, to the reference wave source 40 (step S502). The reference wave source 40, which has received the transmission start signal, starts transmitting the transmission radio wave 50.

[0071] The first acquisition unit 103 acquires a first received radio wave phase indicating the phase of the radio wave received by the antenna 21 from the reference wave source 40, based on the reference positional relationship between the antenna 21 and the reference wave source 40 that transmits the target radio wave (step S503).

[0072] The drive control unit 104 cooperates with the drive units 23A and 24A to start control for moving the position of the antenna 21 to a measurement position between the apex of the hemisphere C and the periphery of the hemisphere C (step S504).

[0073] The second acquisition unit 105 receives the transmitted radio wave 50 emitted from the reference wave source 40 at the antenna 21 each time the position of the antenna 21 is controlled to move to the measurement position, and acquires a second received radio wave phase indicating the phase of the transmitted radio wave 50 (step S505).

[0074] The calculation unit 106 calculates a theoretical phase based on the reference distance between the antenna 21 and the reference wave source 40 measured by the measurement unit 101, the first received radio wave phase acquired by the first acquisition unit 103, and the transmission-reception distance R between the antenna 21 and the reference wave source 40 (step S506).

[0075] Furthermore, the calculation unit 106 calculates the phase difference S from the difference between the second received radio wave phase acquired by the second acquisition unit 105 and the theoretical phase (step S507).

[0076] Furthermore, the calculation unit 106 calculates the distortion information of the support unit 23 from the calculated phase difference S (step S508). When step S508 ends, this process ends.

[0077] Next, Fig. 6 is a flowchart showing an example of the flow of processing executed by the measurement device 10. The description will be given assuming that the processing of Fig. 5 has been completed immediately before the flowchart shown in Fig. 6 is executed. Also, the description will be given assuming that the communication system 30 is not transmitting radio waves immediately before the flowchart shown in Fig. 6 is executed.

[0078] The measurement unit 101 measures the reference positional relationship between the antenna 21 and the communication system 30 (step S511).

[0079] The transmission control unit 102 transmits a transmission start signal indicating the start of transmission of the measurement target radio wave 52 to the communication system 30 (step S512). The communication system 30 that has received the transmission start signal starts transmitting the measurement target radio wave 52.

[0080] The drive control unit 104 cooperates with the drive units 23A and 24A to start control for moving the position of the antenna 21 to a measurement position between the apex and the periphery of the hemisphere C (step S513). The drive control unit 104 controls the drive unit 25A every time the position of the antenna 21 is moved.

[0081] Further, the drive control unit 104 cooperates with the drive unit 25A to control the rotational drive of the vehicle T placed on the support unit 25 at predetermined rotation angles (step S514).

[0082] The third acquiring unit 107 acquires a received measurement radio wave indicating the measurement radio wave received by the antenna 21 from the measurement target radio wave 52 transmitted from the communication system 30 (step S515).

[0083] The correction unit 108 corrects the received measurement radio wave acquired by the third acquisition unit 107 based on the distortion information calculated by the calculation unit 106 (step S516). The correction unit 108 stores the corrected received measurement radio wave in the auxiliary storage device 14. When the correction unit 108 stores the corrected received measurement radio wave in the auxiliary storage device 14, this process ends.

[0084] As described above, the measurement device 10 according to an embodiment of the present disclosure acquires a first received radio wave phase indicating the phase of the radio wave received by the antenna 21 based on the reference positional relationship between the antenna 21 and the target transmitting the target radio wave. The measurement device 10 also calculates an ideal received radio wave phase indicating the phase of an ideal radio wave received by the antenna 21 from the target radio wave transmitted from the target for each position of the antenna 21 based on the first received radio wave phase. Furthermore, the measurement device 10 acquires a second received radio wave phase indicating the phase of the radio wave received by the antenna 21 for each position of the antenna 21. Then, the measurement device 10 performs correction based on distortion information indicating the distortion of the support part 23 calculated from the phase difference S indicating the difference between the ideal received radio wave phase and the second received radio wave phase.

[0085] As a result, according to this embodiment, even when distortion occurs in the support portion 23 that supports the antenna 21, the distortion of the support portion 23 can be calculated from the phase difference S of the radio waves received by the antenna 21, thereby making it possible to measure the communication performance of the communication system 30 with high accuracy.

[0086] Second embodiment The second embodiment will be described with reference to the drawings.

[0087] Next, a second embodiment will be described. Explanations of parts common to the first embodiment will be omitted as appropriate. Note that the same components as those in the first embodiment will be given the same reference numerals and explanations will be omitted as appropriate.

[0088] In the above-described first embodiment, a form has been described in which the received measurement radio wave acquired by the third acquisition unit 107 is corrected based on the phase difference S calculated by the calculation unit 106. In the second embodiment, a form will be described in which the calculation unit 106 calculates the position coordinates of the support unit 23, thereby correcting the drive control content of the antenna 21 by the drive control unit 104.

[0089] In detail, the distortion information calculated by the calculation unit 106 included in the measurement apparatus 10 according to the second embodiment includes position information indicating the position of the distortion of the support unit 23. Here, the position information will be described with reference to FIG.

[0090] FIG. 7 is a diagram for explaining an example of the position coordinates of the antenna 21 and the reference wave source 40. As shown in FIG.

[0091] First, the drive control unit 104 cooperates with the drive unit 23A to control the position of the antenna 21 to move in the Z direction at a constant interval Δh. Here, the constant interval Δh indicates the distance that the antenna 21 moves in the Z direction. The value of the constant interval Δh is constant. Also, the constant interval Δh is calculated based on the (n-1)th position coordinate (X n-1 ,Z n-1 ) and the position coordinates of the n-th antenna 21 (X n ,Z n ), this can be expressed by the following equation 4.

[0092]

number

[0093] When there is no distortion in the support portion 23, the position coordinate (X n ,Z n ) is expressed as the position coordinates of the antenna 21 at the n-1th time and a constant interval Δh, the position coordinates (X n ,Zn )=(X n-1 ,Z n-1 +Δh). Path 211 shows the movement trajectory of antenna 21 in a state where support portion 23 is distorted. For example, when support portion 23 is distorted, antenna 21 moves in the X direction and Z direction as shown by path 211, and therefore the position coordinates of antenna 21 at the nth time cannot be expressed as a constant interval Δh from the position coordinates of antenna 21 at the (n-1)th time.

[0094] In this embodiment, the calculation unit 106 calculates distortion information of the support unit 23 based on the phase difference S between the first received radio wave phase acquired by the first acquisition unit 103 and the second received radio wave phase acquired by the second acquisition unit 105.

[0095] In detail, the first acquisition unit 103 receives, at the antenna 21, the transmitted radio waves 50 transmitted from the reference wave source 40 that has received a transmission start signal for the transmitted radio waves 50 transmitted by the transmission control unit 102, based on a reference positional relationship in which the antenna 21 and the reference wave source 40 are disposed. The second acquisition unit 105 receives, at the antenna 21, the transmitted radio waves 50 transmitted from the reference wave source 40 that has received a transmission start signal for the transmitted radio waves 50 transmitted by the transmission control unit 102, every time the position of the antenna 21 is controlled to move to the next measurement position between the apex of the hemisphere C and the periphery of the hemisphere C in cooperation with the drive unit 23A through drive control by the drive control unit 104.

[0096] Since the second acquisition unit 105 receives the transmitted radio wave 50 from the reference wave source 40 at the antenna 21 every time the position of the antenna 21 is moved and controlled to the measurement device 10, the second acquisition unit 105 can acquire the second received radio wave phase received at the (n-1)th time and the second received radio wave phase received at the antenna 21 at the nth time. The calculation unit 106 can calculate the difference L2 between the (n-1)th and nth time transmission / reception distances based on the second received radio wave phase received at the (n-1)th time and the second received radio wave phase received at the antenna 21 at the nth time.

[0097] The difference L2 in the distance between the transmitter and receiver is expressed as the position coordinate (X n-1 ,Zn-1 ) and the position coordinates of the n-th antenna 21 (X n ,Z n ) and the position coordinates of the reference wave source 40 (X r ,Z r ), this can be expressed by the following equation 5.

[0098]

number

[0099] The calculation unit 106 can calculate the distortion coordinates of the support unit 23 by solving the simultaneous equations consisting of the position coordinates (X0, Z0) of the reference positions of the antenna 21 and the reference wave source 40 measured by the measurement unit 101, the calculated phase difference S, and equations 4 and 5.

[0100] The correction unit 108 corrects the control content related to the drive control of the antenna 21 driven and controlled by the drive control unit 104, based on the position information calculated by the calculation unit 106. In detail, the correction unit 108 corrects the coordinate information indicating the coordinates of the distortion of the support unit 23 of the antenna 21 corresponding to the control content. For example, if the antenna 21 is distorted in the +X direction, the correction content is to move the antenna 21 in the −X direction. Also, if the antenna 21 is distorted in the −Z direction, the correction content is to move the antenna 21 in the +Z direction.

[0101] As a result, by correcting the movement coordinates of the antenna 21, highly accurate measurements can be performed without correcting the radio waves received by the antenna 21.

[0102] Fig. 8 is a flowchart showing an example of the flow of processing executed by the measurement device 10. The following description will be given on the assumption that the reference wave source 40 is not emitting radio waves immediately before the flowchart shown in Fig. 8 is executed.

[0103] The measurement unit 101 measures the reference positional relationship between the antenna 21 and the reference wave source 40 (step S521).

[0104] The transmission control unit 102 transmits a transmission start signal, which indicates the start of transmission of the transmission radio wave 50, to the reference wave source 40 (step S522). The reference wave source 40, which has received the transmission start signal, starts transmitting the transmission radio wave 50.

[0105] The first acquisition unit 103 acquires a first received radio wave phase indicating the phase of the radio wave 50 transmitted from the reference wave source 40 and received by the antenna 21 based on the reference positional relationship between the antenna 21 and the reference wave source 40 (step S523).

[0106] The drive control unit 104 cooperates with the drive unit 23A to perform control to move the position of the antenna 21 in the +Z direction at constant intervals Δh (step S524).

[0107] The second acquisition unit 105 receives the transmitted radio wave 50 emitted from the reference wave source 40 via the antenna 21 each time the position of the antenna 21 is controlled to move to the measurement position, and acquires a second received radio wave phase indicating the phase of the transmitted radio wave 50 (step S525).

[0108] Furthermore, the calculation unit 106 calculates the phase difference S from the difference between the second received radio wave phase acquired by the second acquisition unit 105 and the second received radio wave phase acquired immediately before (step S526).

[0109] Furthermore, the calculation unit 106 calculates distortion information of the support unit 23 from the position coordinates of the reference positions of the antenna 21 and the reference wave source 40 measured by the measurement unit 101 and the calculated phase difference S (step S527). When step S527 ends, this process ends.

[0110] Next, Fig. 9 is a flowchart showing an example of the flow of processing executed by the measurement device 10. The description will be given on the assumption that the processing in Fig. 8 has been completed immediately before the execution of the flowchart shown in Fig. 9. The description will be given on the assumption that the communication system 30 is not transmitting radio waves immediately before the execution of the flowchart shown in Fig. 9.

[0111] The measurement unit 101 measures the reference positional relationship between the antenna 21 and the communication system 30 (step S531).

[0112] The correction unit 108 corrects the contents of the drive unit 23A controlled by the drive control unit 104 (step S532).

[0113] The drive control unit 104 starts control for moving the position of the antenna 21 to a measurement position between the apex of the hemisphere C and the periphery of the hemisphere C based on the correction made by the correction unit 108, and controls the drive unit 25A every time the position of the antenna 21 is controlled to move (step S533). In addition, the drive control unit 104 cooperates with the drive unit 25A to control the rotational drive of the vehicle T placed on the support unit 25 at predetermined rotation angles. When the measurement of the communication system 30 is completed, this process ends.

[0114] As described above, the measurement device 10 according to an embodiment of the present disclosure acquires a first received radio wave phase indicating the phase of the radio wave received by the antenna 21 based on the reference positional relationship between the antenna 21 and the target that transmits the target radio wave. The measurement device 10 also acquires a second received radio wave phase indicating the phase of the radio wave received by the antenna 21 for each position of the antenna 21. Furthermore, the measurement device 10 calculates position information indicating the position of the distortion of the support unit 23 based on the phase difference S between the first received radio wave phase and the second received radio wave phase. The measurement device 10 also corrects the control content related to the drive control of the antenna 21 based on the position information indicating the position of the distortion of the support unit 23.

[0115] As a result, according to this embodiment, even when distortion occurs in the support part 23 supporting the antenna 21, the movement coordinates of the antenna 21 can be corrected based on the position coordinates of the distortion of the support part 23 calculated from the phase difference S of the radio waves received by the antenna 21, thereby making it possible to measure the communication performance of the communication system 30 with high accuracy.

[0116] The program for executing the above-mentioned processes executed by the measuring device 10 of the above-mentioned embodiment may be stored in a computer-readable storage medium such as a CD-ROM, CD-R, memory card, DVD (Digital Versatile Disk), or flexible disk (FD) in an installable or executable format file and provided as a computer program product. The program for executing the above-mentioned processes executed by the measuring device 10 of the above-mentioned embodiment may be stored on a computer connected to a network such as the Internet and provided by downloading the program via the network. The program for executing the above-mentioned processes executed by the measuring device 10 of the above-mentioned embodiment may be provided or distributed via a network such as the Internet.

[0117] Although the embodiment of the present invention has been described above, the embodiment is presented as an example and is not intended to limit the scope of the invention. This new embodiment can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0118] 10. Measuring Equipment 11 CPU 12 ROM 13 RAM 14 Auxiliary storage 15 External I / F 21 Antenna 22, 23, 24, 25 Support part 30. Communication Systems 40 Reference Wave Source 101 Measuring section 102 Outgoing call control section 103 First Acquisition Section 104 Drive control unit 105 Second Acquisition Section 106 Calculation section 107 Third Acquisition Section 108 Correction section

Claims

1. A measurement device comprising a measurement mechanism including an antenna for receiving a first target radio wave transmitted from a first target and a support for supporting the antenna, the measurement device outputting a correction result for the received first target radio wave based on distortion occurring in the support, a first acquisition unit that acquires a first received radio wave phase indicating a phase of the first target radio wave received by the antenna based on a reference positional relationship between the antenna and the first target; a calculation unit that calculates, for each position of the antenna, an ideal received radio wave phase that indicates a phase of an ideal radio wave when the first target radio wave is received by the antenna based on the first received radio wave phase; a second acquisition unit that acquires, for each position of the antenna, a second received radio wave phase indicating a phase of the first target radio wave received by the antenna; a correction unit that performs correction based on distortion information indicating distortion of the support unit, the distortion information being calculated from a phase difference indicating a difference between the ideal received radio wave phase calculated by the calculation unit and the second received radio wave phase acquired by a second acquisition unit; A measuring device comprising:

2. The antenna receives a second target radio wave from a second target different from the first target; a third acquisition unit that acquires a received measurement radio wave indicating a measurement radio wave received by the antenna of the second target radio wave; the distortion information includes distance information indicating a distance between the antenna and the second object, The measurement device according to claim 1 , wherein the correction unit corrects the received measurement radio wave acquired by the third acquisition unit based on the distance information.

3. The measurement device according to claim 2 , wherein the correction section corrects at least one of an amplitude of the received measurement radio wave and a phase of the received measurement radio wave.

4. A drive control unit that drives and controls the antenna; The distortion information includes position information indicating a position of the distortion of the support portion, The measuring device according to claim 1 , wherein the correction section corrects a control content relating to drive control of the antenna, which is drive-controlled by the drive control section, based on the position information.

5. The measurement device according to claim 4 , wherein the correction unit corrects coordinate information indicating coordinates of distortion of a support member of the antenna corresponding to the control content.

6. A measurement method implemented in a measurement device having an antenna for receiving a first target radio wave transmitted from a first target and a support for supporting the antenna, the measurement device outputting a correction result for the received first target radio wave based on distortion occurring in the support, comprising: a first acquisition step of acquiring a first received radio wave phase indicating a phase of the first target radio wave received by the antenna based on a reference positional relationship between the antenna and the first target; a calculation step of calculating an ideal received radio wave phase indicating an ideal radio wave phase of the first target radio wave received by the antenna for each position of the antenna based on the first received radio wave phase; a second acquisition step of acquiring a second received radio wave phase indicating a phase of the first target radio wave received by the antenna for each position of the antenna; a correction step of performing correction based on distortion information indicating distortion of the support portion, the distortion information being calculated from a phase difference indicating a difference between the ideal received radio wave phase calculated in the calculation step and the second received radio wave phase acquired in the second acquisition step; A measurement method including:

7. In a measurement mechanism including an antenna for receiving a first target radio wave transmitted from a first target and a support for supporting the antenna, a computer of the measurement device outputs a correction result obtained by correcting the received first target radio wave based on a distortion occurring in the support, a first acquisition step of acquiring a first received radio wave phase indicating a phase of the first target radio wave received by the antenna based on a reference positional relationship between the antenna and the first target; a calculation step of calculating an ideal received radio wave phase indicating an ideal radio wave phase of the first target radio wave received by the antenna for each position of the antenna based on the first received radio wave phase; a second acquisition step of acquiring a second received radio wave phase indicating a phase of the first target radio wave received by the antenna for each position of the antenna; a correction step of performing correction based on distortion information indicating distortion of the support portion, the distortion information being calculated from a phase difference indicating a difference between the ideal received radio wave phase calculated in the calculation step and the second received radio wave phase acquired in the second acquisition step; A measurement program that executes the measurement.

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