JP2021039050A - Radio wave anechoic box, measurement device, and monitoring method of posture of object under test - Google Patents

Abstract

To provide a radio wave anechoic box, a measurement device, and a monitoring method of a posture of an object under test, which can suppress heat generation inside the box and switching noise associated with power supply, and reliably monitor the posture of the object under test inside the box without degrading the measurement accuracy.SOLUTION: A radio wave anechoic box 1 consists of a camera device 8 having a light source 8a1 that emits infrared rays, a light-receiving sensor 8a2 that receives infrared rays, and a power supply unit 8a3 as means of imaging an object under test (DUT) 100 inside an inner space 52 of an enclosure body 51 of an OTA chamber 50. The enclosure body 51 is connected to an integrated control unit 10 by an external connection panel (access panel 51h) provided on a front outer wall by a DC power supply cable 18. The integrated control unit 10 is configured to supply DC power to the power supply unit 8a3 of the camera device 8 via the DC power supply cable 18.SELECTED DRAWING: Figure 8

Description

The present invention relates to an anechoic box used to measure transmission / reception characteristics and protocol tests of wireless terminals such as mobile phones, smartphones, tablets, and wireless routers, a measuring device, and a method for monitoring the attitude of a subject to be tested.

In recent years, with the development of multimedia, the above-mentioned various wireless terminals have been actively produced. In the future, in particular, wireless terminals (5G terminals) for 5th generation communication that transmit and receive wideband wireless signals in the millimeter wave band will be required, and their performance tests will be effective in line with improvements in communication performance. A measuring method is required.

Among the measurements for 5G terminals as the test target (Device Under Test: DUT), millimeter-wave band transmission / reception characteristics, protocol test, throughput, AFS (average fading sensitivity), TIS (omnidirectional sensitivity), and TRP (radiation). In order to measure the total power), the DUT is housed in a box that is not affected by the surrounding radio wave environment, a so-called anechoic box, together with the test antenna, and measurement is performed in an OTA (Over The Air) environment. There is a need.

As a conventional device for measuring by putting a DUT in an anechoic box, as described in Patent Document 1, an apparatus for performing omnidirectional measurement such as TIS measurement (see paragraphs 0006 to 0007) is already known. It was.

Japanese Patent No. 5886947

In the above-mentioned conventional device, the measurement time becomes long, especially when performing omnidirectional measurement such as TIS measurement. On the other hand, the door of the anechoic box needs to be closed during the measurement, the door cannot be opened until the measurement is completed, and the DUT cannot be visually confirmed. Therefore, as a means for confirming that there is no abnormality such as the DUT falling during the measurement, a video camera built in the anechoic box has been proposed as in Patent Document 1.

However, in order to capture the image of the test object with the video camera, visible light illumination that illuminates the DUT is required. When LED lighting, which is easily available as a commercially available product, is used as the lighting, high illuminance is required for the LED lighting in order to capture the image in the anechoic box with a video camera.

Such LED lighting consumes power consumption of, for example, 10 W or more, and if there is no cooling device such as a fan device, the measurement accuracy may deteriorate due to the temperature rise in the anechoic box. Further, when the above-mentioned LED lighting is used, the switching noise of the AC / DC converter that converts AC50Hz / 60Hz of the commercial power supply into direct current (DC) has an adverse effect during the measurement of DUT. The frequency of the switching noise of the AC / DC converter is, for example, 140 MHz, and the high frequency of the switching noise affects the measurement frequency of the DUT (for example, 400 MHZ in the LTE frequency band) (see FIG. 13) to improve the measurement accuracy. There was a possibility of lowering it.

The present invention has been made to solve such a conventional problem, suppresses heat generation inside the box and switching noise due to power supply, and is a test object inside the box without deteriorating measurement accuracy. It is an object of the present invention to provide an anechoic box, a measuring device, and a method for monitoring the attitude of an object to be tested, which can reliably monitor the attitude of the subject.

In order to solve the above problems, the anechoic box according to claim 1 of the present invention is provided in a housing portion (51) having an internal space (52) in which radio waves from the surroundings are blocked, and in the internal space. A turntable (56) that fixes and rotates an object to be tested (100) that transmits or receives a wireless signal to a fixing jig (56d), a light source that emits infrared rays (8a1), and a light receiving sensor that receives infrared rays. A camera device (8) having (8a2) and a power supply unit (8a3), installed in the internal space, and imaging the object to be tested rotated by the turntable, and an external device (10). It is connected by a DC power supply cable (18), and includes a power supply unit (51h) that supplies DC power to the power supply unit by the DC power supply cable.

With this configuration, the anechoic box according to claim 1 of the present invention uses a camera device that emits infrared rays and receives reflected light (infrared rays) from the subject to be tested. Therefore, a conventional device that uses a video camera to obtain a color image. Compared to the above, the current consumption can be suppressed and the heat generation can be significantly reduced, and the temperature rise inside the box can be suppressed. Further, since the DC power supply is supplied to the camera device from the external device, it is possible to eliminate the switching noise as in the conventional device using the commercial power supply. Although the image captured by the camera device is a monochromatic image, it can achieve sufficient performance for confirming the displacement or dropping of the object to be tested.

In the anechoic box according to claim 2 of the present invention, the power supply unit is connected to the external device by a USB cable as the DC power supply cable, and the DC power is supplied from the external device via the USB cable. It may be configured to be.

With this configuration, the anechoic box according to claim 2 of the present invention can supply DC power to the camera device simply by connecting to the external device with a USB cable, and the connection work becomes easy.

In the anechoic box according to claim 3 of the present invention, the camera device has a camera body portion (8a) in which the light source and the light receiving sensor are arranged on the same surface, and an opening (8b3) on one side surface. The light source and the light receiving sensor have a metal housing (8b) for accommodating the camera body so that the light receiving sensor can be seen through the opening, and the housing has the light source and the light receiving sensor on one side surface thereof. A radio wave absorber (8c) may be attached so as to cover the area narrower than the opening to the outer peripheral portion of the opening while leaving the periphery of the opening.

With this configuration, in the anechoic box according to claim 3 of the present invention, the metal housing accommodating the camera body can be electromagnetically shielded by the radio wave absorber, and deterioration of measurement accuracy can be prevented. it can.

In the anechoic box according to claim 4 of the present invention, the housing portion is further provided with a reflector (7) for reflecting the radio signal in the internal space, and the camera device passes through the reflector. The configuration may be arranged so as to avoid the propagation path of the radio signal. With this configuration, the anechoic box according to claim 4 of the present invention can monitor the posture of the object to be tested in a state where heat generation and switching noise are suppressed without lowering the measurement accuracy of the object to be tested.

In the anechoic box according to claim 5 of the present invention, the camera device is positioned between the reflector and the object to be tested on the radio signal propagation axis (RS2) between the reflector and the object to be tested. It is arranged on either the upper surface of the internal space or the four side surfaces of the internal space parallel to the propagation axis so as to be higher than the reflector in the vertical direction orthogonal to the propagation axis. May be.

With this configuration, the anechoic box according to claim 5 of the present invention is located on the four sides of the internal space under the arrangement condition that it is located between the reflector and the test object in the horizontal direction and higher than the reflector in the vertical direction. On the other hand, the camera device can be selectively arranged, and the degree of freedom in design can be increased.

In the radio wave anechoic box according to claim 6 of the present invention, the housing portion is further provided with an antenna (6) for transmitting or receiving the radio signal reflected by the reflector on the bottom surface (52a) of the internal space. A radio wave absorber (55) is installed on the bottom surface of the internal space so as to cover the antenna while avoiding the propagation path of the radio signal, and on the upper surface and the four side surfaces of the internal space, respectively. A radio wave absorber that covers the surface may be provided.

With this configuration, the anechoic box according to claim 6 of the present invention can electromagnetically shield the antenna without interfering with the transmission and reception of radio signals via the reflector between the test object and the antenna, and the measurement of the test object can be performed. It is possible to monitor the posture of the test object while suppressing heat generation and switching noise without adversely affecting the test.

In the anechoic box according to claim 7 of the present invention, the camera device has a distance of 450 mm or more and 600 mm or less to the center of the fixing jig, and the camera device moves toward the center of the fixing jig. The angle formed by the direction and the height direction from the center of the fixing jig to the upper surface of the internal space may be larger than 0 ° and 42 ° or less.

With this configuration, the anechoic box according to claim 7 of the present invention places the camera device at a position where high-precision imaging can be performed without adversely affecting the measurement of the object to be tested and without causing the camera device to be out of focus. It can be arranged, and the attitude monitoring accuracy can be improved while maintaining the measurement accuracy.

The anechoic box according to claim 8 of the present invention may have a configuration in which the housing portion is further provided with a fan device (51k) for cooling the internal space in the internal space. With this configuration, the anechoic box according to claim 8 of the present invention can further suppress heat generation in the internal space, and can monitor the posture of the subject to be tested under even better conditions.

The radio wave anechoic box according to claim 9 of the present invention has a light source (9a1) that emits far infrared rays, a light receiving sensor (9a2) that receives far infrared rays, and a power supply unit (9a3), and is installed in the internal space. Further, the structure may further include a thermal camera device (9) that images the object to be tested, which is rotated by the turntable.

With this configuration, the anechoic box according to claim 9 of the present invention can also monitor the temperature of the object to be tested based on the thermal image captured by the thermal camera device, and the failure of the object to be tested due to abnormal heat generation. The possibility of

In order to solve the above problems, the measuring device according to claim 10 of the present invention is arranged outside the anechoic box according to any one of claims 1 to 9 and the housing portion, and is provided in the internal space. A measuring device (20, 30) that performs a measurement related to a performance test of the test object based on a transmission / reception signal between the provided antenna (5, 6) and the test object, and an external device arranged as described above. A control device (10) for controlling the measuring device is provided, and the anechoic box is provided with a USB terminal (53 g) in which the power supply unit is connected to the power supply unit by wiring in the internal space. The control device has an external connection panel (51h), and the control device has a USB port (11d1) and is connected via a USB cable (18) connected between the USB port and the USB terminal of the external connection panel. It has a configuration in which a DC power supply is supplied to the power supply unit of the camera device.

With this configuration, the measuring device according to claim 10 of the present invention supplies DC power to the camera device by connecting the USB port of the control device and the USB terminal of the external connection panel of the housing portion with a USB cable. It is possible to suppress heat generation inside the box and switching noise due to power supply through simple connection work, and it is possible to reliably monitor the posture of the object to be tested inside the box without degrading the measurement accuracy. ..

In order to solve the above problems, the attitude monitoring method to be tested according to claim 11 of the present invention is arranged as the anechoic box according to any one of claims 1 to 9 and the external device, and is provided in the internal space. The control device (10), which comprises the turntable and the control device (10) for driving and controlling the camera device, and monitors the posture of the test target in the internal space. DC power is supplied to the power supply unit of the camera device via the USB cable (18) connected between the USB port (11d1) of the above and the USB terminal (53 g) of the external connection panel (51h) of the housing unit. A step (S4) of driving the camera device so as to image the object to be tested, a step (S5) of acquiring an image pickup signal of the camera device via the USB cable, and an image pickup signal of the camera device. It is characterized by including a step (S6) of displaying the captured image of the test object on the display unit based on the above.

With this configuration, the test target posture monitoring method according to claim 11 of the present invention connects the USB port of the control device and the USB terminal of the external connection panel of the housing portion with a USB cable to the camera device. It can supply DC power, and through simple connection work, it suppresses heat generation inside the box and switching noise associated with power supply, and reliably monitors the posture of the object to be tested inside the box without degrading measurement accuracy. can do.

The present invention suppresses heat generation inside the box and switching noise due to power supply, and can reliably monitor the posture of the object to be tested in the box without deteriorating the measurement accuracy. A target posture monitoring method can be provided.

It is a figure which shows the appearance structure of the measuring apparatus which concerns on 1st Embodiment of this invention. It is an enlarged view which shows the structure of the access panel provided in the housing main body part of the measuring apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the structure in the state which see through the OTA chamber of the measuring apparatus which concerns on 1st Embodiment of this invention. It is a schematic diagram for demonstrating the whole spherical scanning of DUT and the principle of TRP measurement by the DUT holding part of the measuring apparatus which concerns on 1st Embodiment of this invention. It is a conceptual diagram which shows the arrangement example of the receiving antenna in the antenna holding mechanism of the measuring apparatus which concerns on 1st Embodiment of this invention. It is an exploded perspective view which shows the structure of the camera apparatus arranged inside the housing main body part of the measuring apparatus which concerns on 1st Embodiment of this invention. It is a schematic diagram for demonstrating the arrangement condition of the camera apparatus inside the housing main body part of the measuring apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the connection mode of the internal component of the housing main body part by the access panel of the measuring apparatus which concerns on 1st Embodiment of this invention, and the external element arranged outside the housing main body part. It is a block diagram which shows the functional structure of the integrated control apparatus of the measuring apparatus which concerns on 1st Embodiment of this invention. It is a flowchart which shows the attitude monitoring control of the DUT by the integrated control device of the measuring device which concerns on 1st Embodiment of this invention. It is a flowchart which shows the TRP measurement processing operation in FIG. It is a signal characteristic graph which shows the radiated noise inside the anechoic box in the measuring apparatus which concerns on 1st Embodiment of this invention. It is a signal characteristic graph which shows the radiation noise inside an anechoic box in a conventional apparatus. It is a figure which shows the structure of the measuring apparatus which concerns on 2nd Embodiment of this invention in the state which see through the OTA chamber. It is a block diagram which shows the functional structure of the integrated control apparatus of the measuring apparatus which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the structure of the camera body part of the thermal camera apparatus mounted on the measuring apparatus which concerns on 2nd Embodiment of this invention.

Hereinafter, the anechoic box, the measuring device, and the posture monitoring method for the test object according to the present invention will be described with reference to the drawings.

(First Embodiment)
First, the configuration of the measuring device 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 9.

The measuring device 1 according to the present embodiment has an external structure as shown in FIG. FIG. 1 is a front view of the measuring device 1, and FIG. 1 (b) is a rear view. As shown in FIG. 1, the measuring device 1 includes an integrated control device 10, an NR system simulator 20 and a wireless communication analyzer 30 arranged in each rack 90a of the gantry 90, and an OTA chamber mounted on the gantry 90. It is configured to include 50. The integrated control device 10, the NR system simulator 20, and the wireless communication analyzer 30 are configured as the control device (external device) and the measuring device of the present invention, respectively.

In the measuring device 1, the OTA chamber 50 targets, for example, a wireless terminal (5G wireless terminal) for a 5G NR system (New Radio System) or a wireless terminal (4G wireless terminal) for LTE (Device Under Test: This is an example of a Compact Antenna test Range (CATR) that provides an OTA (Over The Air) test environment in a performance test called DUT). The OTA chamber 50 constitutes the anechoic box of the present invention.

The OTA chamber 50 is composed of a metal housing body 51 having a rectangular appearance as a whole. As shown in FIG. 1A, a door 51a is provided on the front outer wall surface of the housing body 51. The door 51a has a rectangular planar shape and is attached to the housing body 51 so as to be openable and closable via a hinge 51b. The door 51a is also provided with a pair of sealed handles 51c and one handle 51f at the end opposite to the hinge 51b. The sealing handle 51c is configured to be rotatable on a surface parallel to the front outer wall surface of the housing body 51. The closed handle 51c can close the door 51a in a closed state by rotating the integrally formed engaging portion 51d so as to engage with the opposing side engaging portion 51e, and the engaging portion 51d can be closed. The door 51a can be released from the sealed state by rotating the door 51a so that the engagement with the opposing side engaging portion 51e is released. The handle 51f functions as an operating means for opening and closing the door 51a released from the sealed state. The housing body 51 constitutes the housing of the present invention.

In the housing body 51, the mounting position of the door 51a is, for example, in the case of a structure in which the front outer wall of the housing body 51 is formed by connecting three plate members by two divided portions 51g. The position is within the range from the right end portion of the housing to the second divided portion 51 g toward the front surface of FIG. 1 (a) and straddles the first divided portion 51 g from the right end portion of the housing. .. The housing main body 51 has an opening (not shown) at a position corresponding to the door 51a, and the opening can be opened and closed by opening and closing the door 51a. In the OTA chamber 50, the position of the door 51a in the housing body 51 is arranged in the internal space 52 of the housing body 51 through the opening when the door 51a is opened, for example, for a test described later. The antenna 5, the antenna for spurious measurement (hereinafter referred to as the receiving antenna) 6, the camera device 8, the DUT holding unit 56, the antenna holding mechanism 61, the DUT 110, and the like can be appropriately accessed.

The housing main body 51 has an access panel 51h and a ventilation hole 51i on the front outer wall in addition to the door 51a described above. The access panel 51h is a part of the components arranged in the internal space 52 of the housing body 51 (test antenna 5, receiving antenna 6, camera device 8, fan 51k, and driving unit of the DUT holding unit 56, which will be described later). 56e, the power unit 64 of the antenna holding mechanism 61, the DUT 100, etc.) and the integrated control device 10, the NR system simulator 20, and the wireless communication analyzer 30 (or the integrated control device 10) arranged outside the housing body 51. , The NR system simulator 20 and the wireless communication analyzer 30) have a function of electrically connecting (see FIG. 8).

As shown in FIG. 2, the access panel 51h has, for example, connector portions 53a, 53b, 53c, a LAN connection terminal 53d, an RF signal input / output terminal 53e, a connection terminal 53f for an LTE link antenna, and a USB (Universal Serial Bus) terminal. It has 53 g and through holes 53h, 53i, 53j. The connector units 53a and 53b are for connecting, for example, the NR system simulator 20, and the connector units 53c are for connecting, for example, the wireless communication analyzer 30. The LAN connection terminal 53d is, for example, a terminal for connecting a LAN cable extending from a hub (HUB) of the network (LAN) 19 to which the integrated control device 10 is connected. The RF signal input / output terminal 53e is, for example, a terminal for connecting the test antenna 5. The connection terminal 53f for the LTE link antenna is, for example, a terminal for connecting the receiving antenna 6. The USB terminal 53g is for connecting a USB cable as a DC power supply cable 18 described later. The access panel 51h constitutes the power supply unit and the external connection panel of the present invention.

The ventilation hole 51i functions to release the air in the internal space 52 of the housing body 51 to the outside, and as will be described later, the fan 51k (which is provided on the back outer wall of the housing body 51). It is provided at a position corresponding to (see FIG. 1 (b)).

As shown in FIG. 1B, the OTA chamber 50 is provided with a ventilation hole 51j and a fan 51k on the back outer wall surface of the housing body 51. Like the front outer wall, the back outer wall surface of the housing main body 51 also has a structure in which three plate members are connected by two divided portions 51 g to form one. On the back outer wall surface of the housing body 51, the ventilation hole 51j is formed, for example, at a position above the left end plate member toward the back surface, and the fan 51k is formed, for example, at a position below the left end plate member. ing. As described above, the arrangement position of the fan 51k is a position corresponding to the ventilation hole 51i on the front outer wall of the housing main body 51. The fan 51k constitutes the fan device of the present invention.

Next, the internal configuration of the OTA chamber 50 will be described. As shown in FIG. 3, the OTA chamber 50 includes a test antenna 5, a plurality of receiving antennas 6, a reflector 7, and a camera device 8 in a rectangular parallelepiped internal space 52 of the housing main body 51. The DUT holding portion 56 and the antenna holding mechanism 61 are arranged and configured. A radio wave absorber 55 is attached to the entire inner surface of the housing body 51, that is, the bottom surface 52a, the four side surfaces 52b, and the top surface 52c in the internal space 52, and the function of restricting the radiation of radio waves to the outside is strengthened.

Specifically, in the OTA chamber 50, the housing body 51 is provided with a receiving antenna 6 on the bottom surface 52a of the internal space 52 to transmit or receive a radio signal reflected by the reflector 7, and is provided on the bottom surface 52a of the internal space 52. The radio wave absorber 55 is installed so as to cover the receiving antenna 6 while avoiding the propagation path of the radio signal, and the radio wave absorbers covering the upper surfaces 52c and the four side surfaces 52b of the internal space 52 are covered. It has a configuration in which 55 is provided. As the radio wave absorber 55, for example, a radio wave absorber material such as urethane foam impregnated with a dielectric paint is used. Further, the shape of the radio wave absorber has the shape of a pyramid. In this way, the OTA chamber 50 realizes an anechoic box having an internal space 52 that is not affected by the surrounding radio wave environment. The anechoic chamber used in this embodiment is, for example, an Anechoic type.

The test antenna 5 transmits and receives radio signals to and from the antenna 110 of the DUT 100, which is rotatably held by the DUT holding unit 56. The test antenna 5 is attached to the required position of the side surface 52b of the internal space 52 of the housing body 51 by using the holder 57 so as to have directivity with respect to the DUT 100 held by the DUT holding portion 56. There is. The antenna 110 of the DUT 100 uses, for example, a radio signal in a specified frequency band (millimeter wave band) conforming to the 5G NR standard, and the test antenna 5 also uses a radio signal in the same frequency band as the antenna 110 of the DUT 100. Is used.

The receiving antenna 6 receives the radio signal radiated from the antenna 110 of the DUT 100 via the reflector 7. In the present embodiment, for example, the six receiving antennas 6 are rotatably held by the antenna holding mechanism 61 so as to be separated from each other and sequentially pass through the focal position F of the reflector 7. Each of the six receiving antennas 6 uses radio signals of a predetermined spurious frequency band from a frequency band lower than the above-mentioned specified frequency band (millimeter wave band) to a predetermined spurious frequency band, for example, six division frequency bands. Is what you do. Specifically, the frequency bands used by the six receiving antennas 6 correspond to, for example, numbers 1, 2, 3, 4, 5, 6, ..., 6 GHz to 18 GHz, 18 GHz to 26 GHz, 26 GHz. Each division frequency band of ~ 40 GHz, 40 GHz to 60 GHz, 60 GHz to 76 GHz, 76 GHz to 90 GHz is defined. As the test antenna 5 arranged in the internal space 52 of the OTA chamber 50, for example, an antenna that uses a frequency band of 24.25 GHz to 43.5 GHz as a default frequency band may be adopted.

The reflector 7 realizes a radio wave path that returns a radio signal radiated from the antenna 110 of the DUT 100 to the light receiving surface of the receiving antenna 6. The reflector 7 has an offset parabola-type structure having a mirror surface (a shape obtained by cutting out a part of the rotating parabola of a perfect circular parabola) that is asymmetric with respect to the axis of the rotating radiation surface. As shown in FIG. 3, the reflector 7 is attached to a required position on the side surface 52b of the OTA chamber 50 by using the reflector holder 58. The reflector 7 is held by the reflector holder 58 in such a posture that the radio signal from the antenna 110 of the DUT 100 held by the DUT holding portion 56 can be incident on the rotating paraboloid. The reflector 7 receives a radio signal in the spurious frequency band radiated from the antenna 110 together with the signal to be measured by the DUT 100 that has received the test signal on the rotating paraboloid, and is arranged at the focal position F of the rotating paraboloid. It is arranged at a position and orientation that can be reflected toward the receiving antenna 6.

Specifically, in the OTA chamber 50 according to the present embodiment, as shown in FIG. 3, the reflector 7 is arranged in the radio wave propagation path between the DUT 100 and the receiving antenna 6. The reflector 7 is attached to the side surface 52b of the housing body 51 so that the position indicated by the reference numeral F in the drawing is the focal position.

The reflector 7 and one receiving antenna 6 held by the antenna holding mechanism 61 are in an offset state in which the beam axis BS1 of the receiving antenna 6 is tilted by a predetermined angle α with respect to the axis RS1 of the reflector 7. The one receiving antenna 6 referred to here is a receiving antenna 6 that can be seen through from the reflector 7 through the opening 67a of the cover portion 67 that covers the antenna holding mechanism 61.

The reflector 7 has a focal position F on the beam axis BS1 of the receiving antenna 6, and each receiving antenna 6 held by the rotating body 62 of the antenna holding mechanism 61 is one receiving that can secure the above-mentioned see-through. The position of the antenna 6, that is, the focal position F of the reflector 7 can be sequentially passed. The tilt angle α described above can be set to, for example, 30 degrees. In this case, the receiving antenna 6 is held so as to face the reflector 7 at an elevation angle of 30 degrees, that is, at an angle facing the reflector 7 and the receiving surface of the receiving antenna 6 is perpendicular to the beam axis of the radio signal. It will be held by the mechanism 61. By adopting the offset parabolic reflector 7, the reflector 7 itself can be made small, and the mirror surface can be arranged in a posture close to vertical, which has the advantage that the structure of the OTA chamber 50 can be reduced. ..

Next, the configurations of the DUT holding portion 56 and the antenna holding mechanism 61 will be described. The DUT holding portion 56 rotates the DUT 100 while holding the DUT 100 (such as a spherical scan described later), and is provided so as to extend in the vertical direction on the bottom surface 52a of the internal space 52 of the OTA chamber 50. There is.

As shown in FIG. 3, the DUT holding portion 56 has a turntable 56a, a support column member 56b, a DUT mounting portion 56c, and a driving portion 56e (see FIG. 9). The turntable 56a is composed of a plate member having a disk shape, and has a configuration (see FIG. 9) that rotates about an azimus axis (rotation axis in the vertical direction). The strut member 56b is composed of columnar members arranged so as to extend in the vertical direction on the plate surface of the turntable 56a.

The DUT mounting portion 56c is arranged in parallel with the turntable 56a near the upper end of the support column member 56b, and has a mounting tray 56d on which the DUT 100 is mounted. The DUT mounting portion 56c has a configuration (see FIG. 9) that can rotate around a roll axis (rotation axis in the horizontal direction).

As shown in FIG. 9, the drive unit 56e includes, for example, a drive motor 56f that rotationally drives the azimuth shaft and a drive motor 56g that rotationally drives the roll shaft. The drive unit 56e is composed of a two-axis positioner provided with a mechanism for rotating the azimuth shaft and the roll shaft in their respective rotation directions by the drive motor 56f and the drive motor 56g. In this way, the drive unit 56e can rotate the DUT 100 mounted on the mounting tray 56d in two axial directions (azimus axis and roll axis) together with the mounting tray 56d. Hereinafter, the entire DUT holding unit 56 including the driving unit 56e may be referred to as a biaxial positioner (see FIG. 9).

The DUT holding unit 56 can scan the DUT 100 in a spherical shape while mounting (holding) the DUT 100 on the mounting tray 56d. The DUT scanning in the DUT holding unit 56 is controlled by the DUT attitude control unit 15c of the integrated control device 10 described later.

Here, the whole spherical scanning and TRP measurement principle of the DUT 100 will be described with reference to FIG. FIG. 4A is a diagram showing a spherical coordinate system related to the total spherical scanning of the DUT 100, and FIG. 4B is a diagram showing the distribution of the angular sample points PS in the spherical coordinate system. The total spherical scanning of the DUT 100 means that the antenna surface of the antenna 110 is one of the spheres B (see FIG. 4B) that defines the spherical coordinate system (γ, θ, φ) (see FIG. 4A). The DUT holding unit 56 is moved in the azimuth direction so that the operation of stopping for a specified time toward the angle sample point PS and then moving to the next angle sample point PS is sequentially and repeatedly executed for all the angle sample points PS. And it is a control to drive the rotation in the roll direction.

The antenna holding mechanism 61 constitutes, for example, an antenna automatic arrangement means 60 (see FIG. 3) that automatically arranges the reflectors 7 of the six receiving antennas 6 at the focal position F, and is an internal space 52 of the OTA chamber 50. It is provided on the bottom surface 52a of the.

As shown in FIG. 3, the antenna holding mechanism 61 has a power unit 64 and a cover unit 67. The antenna holding mechanism 61 is composed of a rotating body 62 that can rotate around the rotating shaft 63, and the rotating body 62 has, for example, six receiving antennas 6 arranged on a circumference centered on the rotating shaft 63. .. More specifically, as shown in FIG. 5, the rotating body 62 is centered on the rotation axis 63 at equal intervals, that is, on a horizontal plane, along the outer circumference of the circle C1 that defines the circumference described above. Each receiving antenna 6 is arranged at an interval of 60 degrees. Here, the antenna holding mechanism 61 is in the internal space 52 so that the receiving surface of each receiving antenna 6 whose position moves (orbits) in the circumferential direction on the circumference due to the rotation of the rotating body 62 passes through the focal position F of the reflector 7. It is installed in.

The power unit 64 has a drive motor 65 that rotationally drives the rotating body 62 via the rotary shaft 63, and a connecting member 66 such as a gear arranged between the drive motor 65 and the rotary shaft 63. .. The cover unit 67 covers the antenna holding mechanism 61 and the power unit 64 so that the intrusion of radio waves from the outside and the radiation of radio waves to the outside can be regulated.

An opening 67a is formed in the cover portion 67. The opening 67a provides a view from the receiving antenna 6 to the rotating paraboloid of the reflector 7 when one of the receiving antennas 6 held by the antenna holding mechanism 61 is arranged at the focal position F of the reflector 7. It is formed in a position where it can be secured.

Next, the configuration of the camera device 8 will be described with reference to FIG. The camera device 8 is, for example, an imaging means for imaging the DUT 100 during measurement. The camera device 8 can be driven to monitor the posture of the DUT 100 at an appropriate timing in addition to the measurement of TIS, TRP, and the like.

As shown in FIG. 6, the camera device 8 includes a camera main body 8a, a camera holding portion 8b, and a radio wave absorbing plate 8c. The camera body 8a is provided inside the housing, a light receiving sensor 8a2 provided on one surface of a rectangular parallelepiped housing, a plurality of infrared LEDs 8a1 arranged on the circumference of the light receiving sensor 8a2 so as to surround the light receiving sensor 8a2. It has a power supply unit 8a3 to be used. The infrared LED 8a1 is a light source that irradiates infrared rays, and the light receiving sensor 8a2 receives the reflected light from the irradiated infrared rays DUT100. The power supply unit 8a3 supplies a DC power supply for driving the infrared LED 8a1 and the like.

The camera holding portion 8b is a metal component having a housing portion 8b1 having a space capable of accommodating the camera main body portion 8a and an extending portion 8b2 integrally formed with the housing portion 8b1 and extending outward. Is. The housing portion 8b1 has an opening 8b3 on one surface opposite to the extending portion 8b2, and each outer surface has a mesh-like structure in which a plurality of heat dissipation holes 8b4 are formed. The end of the extending portion 8b2 of the housing portion 8b1 has a structure in which the camera holding portion 8b can be screwed and fixed to the fixture 8d fixed to, for example, the upper surface 52c of the internal space 52 of the OTA chamber 50.

The camera holding portion 8b can accommodate the camera main body portion 8a in the space of the housing portion 8b1 through the opening 8b3. To do this, first, the camera body 8a is inserted into the space together with the support member 8b4, and then the support member 8b4 is returned to a position where it abuts on the inner surface of the space, and then the support member 8b4 is opened to the opening 8b3. It is fixed to the outer circumference of the camera by screwing. In this state, the surface of the camera body 8a on which the infrared LED 8a1 and the light receiving sensor 8a2 are provided and the surface of the camera holding unit 8b on which the opening 8b3 is formed are substantially flush with each other.

In this state, the opening 8b3 is left around the infrared LED 8a1 and the light receiving sensor 8a2 on the surface of the camera body 8a where the infrared LED 8a1 and the light receiving sensor 8a2 are provided and the surface of the camera holding portion 8b where the opening 8b3 is formed. A radio wave absorbing plate 8c is attached from a narrower area to the outer peripheral portion of the opening 8b3. The radio wave absorbing plate 8c blocks electromagnetic waves incident from the front of the infrared LED 8a1 and the light receiving sensor 8a2, protects the camera body 8a and the camera holding part 8b from the electromagnetic waves, and is predetermined for maintaining a sufficient electromagnetic wave shielding function. Has the size of.

The camera device 8 accommodates the camera main body 8a in the housing 8b1 of the camera holding portion 8b, and when the camera holding portion 8b and the radio wave absorbing plate 8c on one side of the camera main body 8a are attached, the infrared LED 8a1 And the light receiving sensor 8a2 can be seen from the opening 8b3. In this state, it can be attached to the fixture 8d fixed to the upper surface 52c of the internal space 52 of the OTA chamber 50 by screwing it with the screw 8b5. Here, it is desirable that the angle of the extending portion 8b2 with respect to the housing portion 8b1 is formed so that the light receiving sensor 8a2 faces the area where the DUT 100 can be imaged when attached to the fixture 8d.

Further, it is desirable that the camera device 8 is mounted at a position where it does not interfere with the radio wave propagation path between the antenna 110 of the DUT 100 and the reflector 7. FIG. 7 shows an arrangement example of the camera device 8 when the OTA chamber 50 having the housing main body 51 having a size of 2000 mm in width, less than 2000 mm in length, and 1200 mm in depth is used, for example. FIG. 7A is a conceptual diagram showing the size of the housing body 51 and the positional relationship between the camera device 8 and the DUT holding portion 56 in the internal space 52, and FIG. 7A is a conceptual diagram showing the positional relationship between the camera device 8 and the DUT holding unit 56 in the internal space 52. It is an enlarged view which shows the positional relationship between the upper surface 52c and the DUT holding part 56.

In the example shown in FIG. 7, the camera device 8 has a distance of 300 mm from the upper end of the mounting tray (fixing jig) 56d of the DUT mounting portion 56c to the upper surface of the internal space 52, and the center O of the mounting tray 56d. The distance from the top surface to the top surface is 450 mm (see FIG. 7B), the distance to the center O of the mounting tray 56d is 600 mm, and the distance from the side surface of the internal space 52 near the installation position of the DUT holding portion 56. It is located at a position of 750 mm (see FIG. 7 (a)). The angle θ formed by the direction of the center O from the camera device with respect to the height direction is 42 °, and the DUT 100 can be photographed with a desired size. If the camera device is arranged in a place where the angle θ is further larger than this, the DUT 100 appears small, and it is necessary to use an expensive camera having a large lens magnification in order to shoot the DUT 100 at a desired size. In this case, mass production becomes difficult in terms of cost. Further, if the camera is installed directly above the DUT 100, the entire DUT 100 may not be displayed. Therefore, the range of θ in which the camera device 8 is installed is 0 ° <θ ≦ 42 °, and the camera device 8 and the camera device 8 are installed. the distance _{d c} of the center O 450mm ≦ _{d c} ≦ 600mm is desirable.

In FIG. 7, it is assumed that the propagation axis of the radio signal between the reflector 7 and the DUT 100 is represented by RS2. In this case, the arrangement mode of the camera device 8 shown in FIG. 7 is located between the reflector 7 and the DUT 100 on the propagation axis RS2 of the radio signal between the reflector 7 and the DUT 100, and is in the vertical direction orthogonal to the propagation axis RS2. Then, the arrangement condition of arranging the interior space 52 on either the upper surface 52c of the internal space 52 or the four side surfaces 52b of the internal space parallel to the propagation axis is satisfied so as to be higher than the reflector 7.

Next, a mode of connecting the internal components of the housing body 51 and the external elements arranged outside by the access panel 51h of the OTA chamber 50 will be described. Among the components arranged in the internal space 52 in the OTA chamber 50, the test antenna 5, the receiving antenna 6, the camera device 8, the DUT 100, the drive motor 65 of the antenna holding mechanism 61, and the drive unit of the DUT holding unit 56. The 56e (drive motors 56f, 56g) are electrically connected to an external component via an access panel 51h, for example, as shown in FIG.

In order to realize the connection mode shown in FIG. 8, in the internal space 52 of the OTA chamber 50, the signal line 5l of the test antenna 5, the signal line 6l of the receiving antenna 6, the signal line 8l1 of the camera device 8, and the connection terminal of the DUT 100. The signal line 100l connected to the antenna holding mechanism 61, the power line 65l of the driving motor 65 of the antenna holding mechanism 61, the driving motor 56f of the DUT holding unit 56 and the power lines 56l1 and 56l2 of 56g, the power line 8l2 of the camera device 8, and the access panel. The connection with each terminal a1, a2, a3, a4, b1, b2, b3, b4 of 51h is realized by wiring carried out by an appropriate route along the bottom surface 52a, the four side surfaces 52b and the top surface 52c of the internal space 52. ing. It is desirable that each of these wirings has a structure that is covered with a radio wave absorber and electromagnetically shielded.

On the other hand, outside the OTA chamber 50, the terminals a1 and a2 of the access panel 51h are connected to the signal output terminal of the NR system simulator 20 and the signal input terminal of the wireless communication analyzer 30 via the corresponding signal lines, respectively. .. The terminals a3 and a4 of the access panel 51h are connected to the imaging signal input terminal and the DUT control terminal of the integrated control device 10 via the corresponding signal lines.

Further, the terminals b1 and the terminals b2 and b3 of the access panel 51h are connected to the feeding terminal for the driving motor 65 of the antenna holding mechanism 61 of the integrated control device 10 and the driving of the DUT holding portion 56 via the respective feeding lines. It is connected to the feeding terminal for the motors 56f and 56g. The terminal b4 of the access panel 51h is connected to the DC power supply cable 18 for the camera device 8 extending from the integrated control device 10.

The DC power supply cable 18 is composed of a USB cable having a USB connector that can be connected to a USB port 11d1 (see FIG. 9) provided as, for example, an external I / F unit 11d of the integrated control device 10. By using a DC power supply cable 18 having a USB connector at the other end, when the terminal b4 of the access panel 51h is composed of a USB terminal (corresponding to the USB terminal 53g in FIG. 2), USB By connecting the port 11d1 and the terminal b4 with a DC power supply cable 18, it is possible to supply DC power to the camera device 8 from the USB port 11d1.

As the DC power supply cable 18, various USB cables such as Type-A, Type-B, and Type-C can be used. The DC power supply cable 18 has a USB. Those conforming to a standard of 3.0 or higher are preferable.

The signal line 8l1 and the power supply line 8l2 of the camera device 8 in the internal space 52 of the OTA chamber 50 may be collectively replaced with a USB cable connected to the terminal b4 (USB terminal 53g) of the access panel 51h. Good. According to this configuration, the camera device 8 and the terminal b4 of the access panel 51h are connected by the above USB cable, and the terminal b4 and the USB port of the integrated control device 10 are connected by the DC power supply cable 18. , The drive DC power can be supplied from the integrated control device 10 to the camera device 8 in the OTA chamber 50 via the DC power supply cable 18.

The access panel 51h is a terminal for connecting the wiring in the internal space 52 of the fan 51k (not shown in FIG. 8) and the integrated control device 10 outside the housing body 51 (for example, terminal b5: see FIG. 8). It may be configured to have.

Next, the functional configuration of the integrated control device 10 will be described. As shown in FIG. 9, the integrated control device 10 has a control unit 11, an operation unit 12, and a display unit 13. The control unit 11 is composed of, for example, a computer device. As shown in FIG. 9, this computer device is, for example, a CPU that performs predetermined information processing for realizing the function of the measuring device 1 and comprehensive control for the NR system simulator 20 and the wireless communication analyzer 30. (Central Processing Unit) 11a, ROM (Read Only Memory) 11b for storing the OS (Operating System) for starting up the CPU 11a, other programs, control parameters, etc., and the OS and applications used by the CPU 11a for operation. A RAM (Random Access Memory) 11c for storing an execution code, data, etc., an external interface (I / F) unit 11d having an input interface function for inputting a predetermined signal and an output interface function for outputting a predetermined signal. It has a non-volatile storage medium such as a hard disk device (not shown) and various input / output ports.

The external I / F unit 11d is communicably connected to the NR system simulator 20 and the wireless communication analyzer 30 via the network 19. Further, the external I / F unit 11d is also connected to the drive motor 65 and the 2-axis positioner 56 in the OTA chamber 50 via the network 19. Further, the external I / F unit 11d includes a USB port 11d1. An operation unit 12 and a display unit 13 are connected to the input / output port. The operation unit 12 is a functional unit for inputting various information such as commands, and the display unit 13 is a functional unit for displaying various information such as the input screen of the various information and the measurement result.

The computer device as the integrated control device 10 functions as the control unit 11 when the CPU 11a executes a program stored in the ROM 11b with the RAM 11c as a work area. As shown in FIG. 9, the control unit 11 includes a signal transmission control unit 15a, an antenna automatic arrangement control unit 15b, a DUT attitude control unit 15c, an analyzer control unit 15d, a camera control unit 15e, and a display control unit 15f. .. The signal transmission control unit 15a, the antenna automatic arrangement control unit 15b, the DUT attitude control unit 15c, the analyzer control unit 15d, the camera control unit 15e, and the display control unit 15f are also predetermined programs in which the CPU 11a is stored in the ROM 11b in the work area of the RAM 11c. It is realized by executing.

The signal transmission control unit 15a monitors the user operation in the operation unit 12, transmits a signal transmission command to the NR system simulator 20 when a predetermined spurious measurement start operation is performed by the user, and tests. Control is performed to transmit a test signal via the antenna 5.

The antenna automatic arrangement control unit 15b controls the plurality of receiving antennas 6 held by the antenna holding mechanism 61 to be sequentially and automatically arranged with respect to the focal position F of the reflector 7. In order to realize this control, for example, the antenna automatic arrangement control table 16a is stored in the ROM 11b in advance. The antenna automatic arrangement control table 16a stores, for example, the number of drive pulses (number of operation pulses) that determine the rotational drive of the stepping motor as control data when the stepping motor is adopted as the drive motor 65. Is. In the present embodiment, the antenna automatic arrangement control table 16a determines the number of operating pulses of the drive motor 65 for moving each receiving antenna 6 to the focal position F of the reflector 7, for example, corresponding to each of the six divided frequency bands. It is stored as control data.

The antenna automatic arrangement control unit 15b expands the antenna automatic arrangement control table 16a into the work area of the RAM 11c, and based on the antenna automatic arrangement control table 16a, the antenna automatic arrangement control unit 15b according to the division frequency band corresponding to each receiving antenna 6. The drive motor 65 in the power unit 64 of the arrangement means 60 is controlled to be rotationally driven. This control makes it possible to realize automatic antenna placement control in which each receiving antenna 6 is sequentially stopped (placed) at the focal position F of the reflector 7.

The DUT attitude control unit 15c controls the attitude of the DUT 100 held by the DUT holding unit 56 at the time of measurement. In order to realize this control, for example, the DUT attitude control table 17a is stored in advance in the ROM 11b. The DUT attitude control table 17a stores, for example, control data of the two-axis positioner 56 constituting the DUT holding unit 56.

The DUT attitude control unit 15c expands the DUT attitude control table 17a into the work area of the RAM 11c, and based on the DUT attitude control table 17a, for example, the DUT 100 sequentially faces all points on the surface of the sphere. The two-axis positioner 56 is driven and controlled so as to change the attitude.

The analyzer control unit 15d controls the measurement processing operation by the wireless communication analyzer 30 connected via the network 19.

The camera control unit 15e supplies a DC power supply to the camera device 8 and controls the drive of the camera device 8 for imaging the DUT 100 on the DUT mounting unit 56c. The display control unit 15f performs display control for displaying the image captured by the camera device 8 in the performance test of the DUT 100, the measurement result of the wireless communication analyzer 30, and the like on the display unit 13.

Next, the posture monitoring control of the DUT 100 in the measuring device 1 according to the present embodiment will be described with reference to FIG. In FIG. 11, the attitude monitoring control at the time of spurious measurement (TRP measurement) for the DUT 100 will be described.

In order to perform TRP measurement in the measuring device 1, it is first necessary to set the DUT 100 in the internal space 52 of the OTA chamber 50. As a result, in the measuring device 1, as the first process of the attitude monitoring control, the user sets the DUT 100 to be tested on the DUT mounting portion 56c of the DUT holding portion 56 of the OTA chamber 50 ( Step S1).

After the setting work of the DUT 100 is performed, in the integrated control device 10, for example, the camera control unit 15e monitors whether or not the posture monitoring start operation of the DUT 100 is performed in the operation unit 12 (step S2).

Here, if it is determined that the attitude monitoring start operation has not been performed (NO in step S2), the camera control unit 15e continues the monitoring in step S1. On the other hand, when it is determined that the attitude monitoring start operation has been performed (YES in step S2), the camera control unit 15e monitors whether or not the TRP measurement start operation has been performed in the operation unit 12 (step S3). ..

Here, when it is determined that the TRP measurement start operation has not been performed (NO in step S3), the camera control unit 15e continues to supply DC power to the camera device 8 by the USB cable used as the DC power supply cable 18. Is supplied, and the camera device 8 is driven so as to image the DUT 100 held by the DUT mounting portion 56c of the DUT holding portion 56 (step S4).

Next, the camera control unit 15e acquires the image pickup signal of the camera device 8 through the signal line of the USB cable having a function as the DC power supply cable 18 (step S5). The display control unit 15f controls the display unit 13 to display the image captured by the camera device 8 on the DUT 100 based on the image pickup signal (step S6).

Subsequently, the camera control unit 15e monitors whether or not the attitude monitoring end operation of the DUT 100 has been performed by the operation unit 12 (step S7). Here, when it is determined that the attitude monitoring end operation has not been performed (NO in step S7), the camera control unit 15e continuously performs the control in step S3 and subsequent steps. On the other hand, when it is determined that the attitude monitoring end operation has been performed (YES in step S7), the camera control unit 15e stops driving the camera device 8 and ends a series of attitude control processes.

On the other hand, when it is determined in step S3 that the TRP measurement start operation has been performed (YES in step S3), the integrated control device 10 executes the TRP measurement process in cooperation with the NR system simulator 20 and the wireless communication analyzer 30. (Step S8).

The TRP measurement process in step S8 will be described with reference to the flowchart shown in FIG. In FIG. 11, a case where six antennas 6 are used to measure spurious signals in different division frequency bands corresponding to the respective receiving antennas 6 will be described.

In the TRP measurement process in step S8, first, the antenna automatic arrangement control unit 15b sets n indicating the measurement order of the spurious measurement frequency band to n = 1 indicating the first frequency band (step S11).

Next, the antenna automatic arrangement control unit 15b controls to automatically move (arrange) the receiving antenna 6 corresponding to the first divided frequency band corresponding to n = 1 to the focal position F of the reflector 7 (step S12). ). At this time, the antenna automatic arrangement control unit 15b reads the number of operation pulses of the receiving antenna 6 corresponding to the first division frequency band corresponding to n = 1 from the antenna automatic arrangement control table 16a, and is based on the number of operation pulses. The drive motor 65 is rotationally controlled.

After executing the automatic arrangement control of the receiving antenna 6 in step S12, the signal transmission control unit 15a transmits a signal transmission command to the NR system simulator 20. In the NR system simulator 20, based on the signal transmission command, the DUT 100 is made to transmit a test signal via the test antenna 5 (step S13).

The signal transmission control unit 15a starts controlling the test signal transmission in step S13 until the spurious measurement with the receiving antenna 6 corresponding to all the divided frequency bands of the spurious frequency band to be measured is completed. (Spurious measurement period), control to continue transmitting test signals.

Further, in the integrated control device 10, after the test signal transmission is started in step S13, the DUT attitude control unit 15c is mounted on the mounting tray 56d of the DUT mounting section 56c in the DUT holding section (2-axis positioner) 56. Control for total spherical scanning of the DUT 100 is performed (step S14). The spherical scanning of the DUT 100 by the DUT attitude control unit 15c is continuously performed during the period up to step S16 (the spherical scanning period) at which the spurious measurement is completed.

During this time, in the integrated control device 10, the analyzer control unit 15d controls the wireless communication analyzer 30 and causes the TRP measurement process to be performed based on the spurious signal received by the receiving antenna 6 moved in step S12 (step S15). Here, the integrated control device 10 passes through each angle sample point PS in the φ direction while maintaining a certain angle of θ in the spherical coordinate system (γ, θ, φ) shown in FIG. 4 (a). The wireless communication analyzer 30 is controlled so that the EIRP is sequentially measured at each angle sampling point PS as the scanning is performed. By performing such EIRP measurement control in accordance with the spherical scanning of the DUT 100 passing through all the angle sample points PS by changing the angle of θ, the wireless communication analyzer 30 has a spherical coordinate system (γ, θ, φ). Measure the EIRP for all angular sample points PS of the system. Further, the integrated control device 10 controls the wireless communication analyzer 30 so as to obtain the TRP which is the sum of the EIRP measurements for all the angular sample points PS.

While executing the TRP measurement process in step S15, the integrated control device 10 determines whether or not the spurious measurement of the first division frequency band corresponding to n = 1 is completed (step S16). Here, when it is determined that the spurious measurement of the first division frequency band has not been completed (NO in step S16), the processing after step S11 is continued.

On the other hand, when it is determined that the spurious measurement of the first division frequency band is completed (YES in step S16), the antenna automatic arrangement control unit 15b indicates that the above n is the last division frequency band. It is determined whether or not n = 6 has been reached (step S9). Here, when it is determined that n = 6 has not been reached (NO in step S17), the antenna automatic arrangement control unit 15b shifts to step S11 and sets n to n = 2, which indicates the second frequency band. To do.

After that, the integrated control device 10 performs the processing of steps S12 to S17 performed on the received signal by the receiving antenna 6 corresponding to the first divided frequency band corresponding to n = 1 to the second processing corresponding to n = 2. It is also carried out for the received signal by the receiving antenna 6 corresponding to the divided frequency band of. Further, the integrated control device 10 is operated by each receiving antenna 6 corresponding to the 3rd to 6th divided frequency bands corresponding to n = 3 to 6 even after the processing of steps S12 to S17 at the time of setting to n = 2 is completed. The processing of S12 to S17 is sequentially executed for the received signal.

During this period, if it is determined in step S17 that n = 6 has been reached (YES in step S17), the antenna automatic arrangement control unit 15b ends a series of TRP measurement processes shown in FIG.

According to the above-described configuration of the measuring device 1 according to the present embodiment, in the drive control of the camera device 8 (see step S4 in FIG. 10), for example, the DC power supply cable 18 as a USB cable is used to control the camera device 8. It supplies DC power for driving. Therefore, unlike the conventional configuration in which the camera device 8 is driven by using the AC / DC converter, switching noise due to the AC / DC converter does not occur.

FIG. 13 is a graph showing signal characteristics showing radiation noise inside the anechoic box of the DUT 100 in a conventional measuring device using an AC / DC converter. In the signal characteristic graph shown in FIG. 13, the horizontal axis represents the frequency and the vertical axis represents the power level. In this signal characteristic graph, it can be seen that remarkable waveform disturbance due to AC / DC converter switching noise occurs in the frequency band from 100 Mhz to 500 Mhz, that is, the LTE frequency band.

On the other hand, FIG. 12 is a graph showing signal characteristics showing radiation noise inside the anechoic box of the DUT 100 in the measuring device 1 according to the present embodiment. In the signal characteristic graph shown in FIG. 12, by adopting the drive control of the camera device 8 using the DC power supply cable 18 having the function of the USB cable, the disturbance of the signal waveform in the LTE frequency band is significantly reduced. I can understand that.

According to FIGS. 12 and 13, the measurement accuracy of the LTE frequency band (400Mhz) is not lowered by suppressing the generation of switching noise (140Mhz) when the commercial power supply is AC / DC converted to drive the camera. It mentions the advantages of realizing the attitude monitoring of the DUT100. However, the present invention adopts the configuration of these embodiments in which the influence on the measurement of the LTE frequency band is eliminated, and thereby, the operation of the non-standalone NR that combines LTE and 5G NR, which has been developed in recent years. As a result, the attitude monitoring of the DUT 100 can be realized without deteriorating the measurement accuracy of the DUT 100.

As described above, the OTA chamber 50 according to the present embodiment is provided in the housing main body 51 having an internal space 52 in which radio waves from the surroundings are blocked, and in the internal space 52, and transmits or receives radio signals. It has a DUT holding unit 56 that fixes and rotates the DUT 100 to the mounting tray 56d, an infrared LED 8a1, a light receiving sensor 8a2, and a power supply unit 8a3, is installed in the internal space 52, and is rotated by the DUT holding unit 56. It includes a camera device 8 that captures an image of the DUT 100, and an access panel 51h that is connected to the integrated control device 10 by a DC power supply cable 18 and supplies DC power to the power supply unit 8a3 by the DC power supply cable 18. ..

With this configuration, the OTA chamber 50 according to the present embodiment can monitor the posture of the DUT 100 installed in the DUT holding portion 56 in the internal space 52 of the pitch-black OTA chamber 50. Since the purpose of monitoring the image of the subject to be tested inside the anechoic box is to check the position shift and drop of the DUT100, the illuminance required for color photography is not required, and a single color image taken with the infrared LED 8a1 is used. If there is, it is possible to confirm it sufficiently.

Further, since the OTA chamber 50 according to the present embodiment can monitor the DUT 100 without LED lighting (LED for lighting), the scale of change when installing the OTA chamber 50 is small and the installation is easy. Is. Furthermore, by using the infrared LED 8a1 that supplies DC power from the integrated control device 10 via USB connection instead of using the lighting LED that supplies power from the commercial power supply, the DUT100 under test in a good environment with less noise It becomes possible to monitor the posture. Further, the power consumption of the camera device 8 is about 1/10 of that when the LED for lighting is used, and it is possible to monitor the DUT 100 during the test in an environment where the measurement accuracy does not deteriorate due to the temperature rise inside the OTA chamber 50. become.

Further, in the OTA chamber 50 according to the present embodiment, the access panel 51h is connected to the integrated control device 10 by a USB cable as the DC power supply cable 18, and DC power is supplied from the integrated control device 10 via the USB cable. It is a composition.

With this configuration, the OTA chamber 50 according to the present embodiment can supply DC power to the camera device 8 simply by connecting to the integrated control device 10 with a USB cable, and the connection work becomes easy.

Further, in the OTA chamber 50 according to the present embodiment, the camera device 8 has a camera body 8a in which the infrared LED 8a1 and the light receiving sensor 8a2 are arranged on the same surface, and an opening 8b3 on one side surface, and the infrared LED 8a1 and the light receiving sensor 8a2. The sensor 8a2 has a metal housing portion 8b for accommodating the camera body portion 8a so that the sensor 8a2 can be seen from the opening 8b3, and the housing portion 8b leaves the periphery of the infrared LED 8a1 and the light receiving sensor 8a2 on one side surface. The radio absorbing plate 8c is attached so as to cover the area narrower than the opening 8b3 to the outer peripheral portion of the opening.

With this configuration, in the OTA chamber 50 according to the present embodiment, the housing portion 8b accommodating the camera main body portion 8a can be electromagnetically shielded by the radio wave absorbing plate 8c, and deterioration of measurement accuracy can be prevented. ..

Further, in the OTA chamber 50 according to the present embodiment, the housing main body 51 is further provided with a reflector 7 for reflecting a radio signal in the internal space 52, and the camera device 8 is a camera device 8 for the radio signal passing through the reflector 7. It has a configuration that is arranged at a position that avoids the propagation path. With this configuration, the OTA chamber 50 according to the present embodiment can monitor the attitude of the DUT 100 in a state where heat generation and switching noise are suppressed without lowering the measurement accuracy of the DUT 100.

Further, in the OTA chamber 50 according to the present embodiment, the camera device 8 is located between the reflector 7 and the DUT 100 on the propagation axis RS2 of the radio signal between the reflector 7 and the DUT 100, and is orthogonal to the propagation axis RS2. It has a configuration in which it is arranged on either the upper surface 52c of the internal space 52 or the four side surfaces 52b of the internal space 52 parallel to the propagation axis RS2 so as to be higher than the reflector 7 in the vertical direction.

With this configuration, the OTA chamber 50 according to the present embodiment is selected on the four sides of the internal space 52 under the arrangement condition that it is located between the reflector 7 and the DUT 100 in the horizontal direction and higher than the reflector 7 in the vertical direction. The camera device 8 can be arranged in a specific manner, and the degree of freedom in design can be increased.

Further, in the OTA chamber 50 according to the present embodiment, the housing main body 51 is further provided with a receiving antenna 6 for transmitting or receiving a radio signal reflected by the reflector 7 on the bottom surface 52a of the internal space 52, and the internal space 52. A radio wave absorber 55 is installed on the bottom surface 52a of the internal space 52 so as to cover the receiving antenna 6 while avoiding the propagation path of the radio signal, and the upper surface 52c and the four side surfaces 52b of the internal space 52 have their respective surfaces. The structure is such that a radio wave absorber 55 is provided to cover the radio wave absorber 55.

With this configuration, the OTA chamber 50 according to the present embodiment can electromagnetically shield the receiving antenna 6 without interfering with the transmission and reception of the radio signal via the reflector 7 between the DUT 100 and the receiving antenna 6, and can be used for the measurement of the DUT 100. The attitude of the DUT can be monitored while heat generation and switching noise are suppressed without adversely affecting the DUT.

Further, in the OTA chamber 50 according to the present embodiment, the camera device 8 has a distance d _c from the camera device 8 to the center O of the mounting tray 56d of 450 mm or more and 600 mm or less, and the center O of the mounting tray 56d from the camera device 8 The angle formed by the direction toward the direction and the height direction from the center O of the mounting tray 56d to the upper surface of the internal space 52 is larger than 0 ° and 42 ° or less.

With this configuration, the OTA chamber 50 according to the present embodiment arranges the camera device 8 at a position where high-precision imaging is possible without adversely affecting the measurement of the DUT 100 and without causing the camera device 8 to be out of focus. This makes it possible to improve the attitude monitoring accuracy of the DUT 100 while maintaining the measurement accuracy.

Further, in the OTA chamber 50 according to the present embodiment, the housing main body 51 has a configuration in which a fan 51k for cooling the internal space 52 is further arranged in the internal space 52. With this configuration, heat generation in the internal space 52 can be further suppressed, and the attitude of the DUT 100 can be monitored under even better conditions.

Further, the OTA chamber 50 according to the present embodiment has a far-infrared LED 9a1, a light receiving sensor 9a2 for receiving far-infrared rays, and a power supply unit 9a3, which are installed in the internal space 52 and rotated by the DUT holding unit 56. The configuration further includes a thermal camera device 9 that captures an image of the DUT 100.

With this configuration, the OTA chamber 50 according to the present embodiment can also monitor the temperature of the DUT 100 based on the thermal image captured by the thermal camera device 9, reducing the possibility of failure of the DUT 100 due to abnormal heat generation. can do.

Further, the measuring device 1 according to the present embodiment includes an OTA chamber 50 having the above-described configuration, a test antenna, a receiving antenna 6 and a DUT 100 arranged outside the housing main body 51 and provided in the internal space 52. The NR system simulator 20 and the wireless communication analyzer 30 that perform measurements related to the performance test of the DUT 100 based on the transmission / reception signals between the two, and the integrated control device 10 that is arranged as an external device and controls the NR system simulator 20 and the wireless communication analyzer 30. The OTA chamber 50 has an access panel 51h provided with a USB terminal 53g connected to the power supply unit 8a3 by wiring in the internal space 52, and the integrated control device 10 has a USB port 11d1. It has a configuration in which DC power is supplied to the power supply unit 8a3 of the camera device 8 via a USB cable connected between the USB port 11d1 and the USB terminal 53g of the access panel 51h.

With this configuration, the measuring device 1 according to the present embodiment connects the USB port 11d1 of the integrated control device 10 and the USB terminal 53g of the access panel 51h of the housing body 51 to the camera device 8 by connecting with a USB cable. DC power can be supplied, and through simple connection work, heat generation inside the OTA chamber 50 and switching noise associated with power supply are suppressed, and the object to be tested in the internal space 52 without deteriorating the measurement accuracy. The posture can be reliably monitored.

Further, the method for monitoring the posture to be tested according to the present embodiment is integrated with the OTA chamber 50 having the above-described configuration, arranged as an external device, and driving and controlling the DUT holding unit 56 in the internal space 52 and the camera device 8. A method for monitoring the posture of the DUT 100 to be tested, which comprises a control device 10 and monitors the posture of the DUT 100 in the internal space 52, and is a USB port 11d1 of the integrated control device and a USB terminal of the access panel 51h of the housing body 51. A step (S4) of supplying DC power to the power supply unit 8a3 of the camera device 8 via a USB cable (DC power supply cable 18) connected between 53 g and driving the camera device 8 so as to image the DUT 100. It has a configuration including a step S5 of acquiring an image pickup signal of the camera device 8 via a USB cable, and a step S6 of displaying an image captured image of the DUT 100 on the display unit 13 based on the image pickup signal of the camera device 8. There is.

With this configuration, the posture monitoring method to be tested according to the present embodiment is a camera device by connecting the USB port 11d1 of the integrated control device 10 and the USB terminal 53g of the access panel 51h of the housing body 51 with a USB cable. DC power can be supplied to 8 and through simple connection work, heat generation in the internal space 52 and switching noise due to power supply are suppressed, and the measurement accuracy is not deteriorated in the internal space 52. The attitude of the DUT 100 can be reliably monitored.

With the above configuration, in the present embodiment, heat generation in the internal space 52 of the OTA chamber 50 and switching noise due to power supply are suppressed, and the DUT 100 in the pitch-black internal space 52 is not deteriorated in the measurement accuracy of the DUT 100. You can reliably monitor your posture.

(Second Embodiment)
FIG. 14 is a diagram showing the configuration of the measuring device 1A according to the second embodiment of the present invention, and shows a configuration example of the OTA chamber 50 in a perspective state. Further, FIG. 15 shows the functional configuration of the integrated control device 10A of the measuring device 1A according to the present embodiment. In FIGS. 14 and 15, the components equivalent to those of the measuring device 1 according to the first embodiment are designated by the same reference numerals.

As shown in FIG. 14, in the measuring device 1A according to the present embodiment, the thermal camera device 9 is provided in the internal space 52 of the OTA chamber 50. Further, in the measuring device 1A, as shown in FIG. 15, the control unit 11 of the integrated control device 10A has the camera control unit 15e1 and the display control unit 15f1 as different configurations from the integrated control device 10 according to the first embodiment. Have. The camera control unit 15e1 has a function of controlling the thermal camera device 9 added to the function of controlling the camera control unit 15e in the control unit 11 of the integrated control device 10 according to the first embodiment. The display control unit 15f1 sets the temperature of each part of the thermal camera device 9 (thermal image: temperature of each part of the DUT 100) to the control function of displaying the image captured by the camera device 8 of the display control unit 15f in the control unit 11 of the integrated control device 10. A control function for displaying the image) is added. The display control unit 15f1 displays, for example, the captured image of the camera device 8 and the captured image (thermal image) of the thermal camera device 9 side by side on the display unit 13. The measuring device 1 has the same configuration as the measuring device 1 according to the first embodiment except that it has a thermal camera device 9, a camera control unit 15e1 and a display control unit 15f1.

In the measuring device 1A, in the thermal camera device 9, the camera body 9a is arranged on one surface of the rectangular parallelepiped housing so as to surround the light receiving sensor 9a2 and the light receiving sensor 9a2. It has a plurality of far-infrared LEDs 9a1 and a power supply unit 9a3 provided inside the housing. The far-infrared LED 9a1 is a light source that irradiates far-infrared rays, and the light receiving sensor 9a2 receives the reflected light from the irradiated far-infrared DUT 100. The power supply unit 9a3 supplies a DC power supply for driving the far-infrared LED 9a1 and the like.

The camera body 9a can be mounted in the internal space 52 by using, for example, a camera holding portion 8b (which may have a dedicated structure) equivalent to the camera holding portion 8b of the camera device 8 according to the first embodiment. it can. At that time, the camera body 9a is, for example, the surface of the housing of the camera body where the far-infrared LED 9a1 and the light receiving sensor 9a2 are provided, and the opening of the camera holding part 8b, as in the camera device 8 according to the first embodiment. It is desirable to have a structure in which the radio wave absorbing plate 8c is attached so as to leave the periphery of the far-infrared LED 9a1 and the light receiving sensor 9a2 around the peripheral portion of 8b3 (see FIG. 6).

It is premised that the arrangement position of the thermal camera device 9 is a position that does not interfere with the imaging of the DUT 100 by the camera device 8. Other than that, it is desirable that the thermal camera device 9 is arranged according to the same arrangement conditions as the camera device 8, for example, a position avoiding the propagation path of the radio signal passing through the reflector 7, or the reflector 7 and the DUT 100. It is located between the reflector 7 and the DUT 100 on the propagation axis of the radio signal between the two, and is parallel to the upper surface 52c of the internal space 52 or the propagation axis so as to be higher than the reflector 7 in the vertical direction orthogonal to the propagation axis. Consideration such as arranging on any surface of the four side surfaces 52b of the internal space is desired.

Similar to the camera device 8, the thermal camera device 9 supplies DC power from the power supply unit 9a3 to drive the far-infrared LED 9a1 and the like. Therefore, in the measuring device 1A according to the present embodiment, not only the camera device 8 but also the power supply unit 9a3 of the thermal camera device 9 is supplied with DC power from the integrated control device 10 through the DC power supply cable 18. It has become. Specifically, wiring (signal line 9l1 and power supply line 9l2) along the internal space 52 between the thermal camera device 9 and a predetermined terminal of the access panel 51h, for example, terminal b6 (see FIG. 8): FIG. 16) to connect. Here, the wiring may be a USB cable. On the other hand, the terminal b6 and the USB port 11d1 (see FIG. 9) of the integrated control device 10 are connected by a DC power supply cable 18 (different from the one that supplies DC power to the camera device 8). Then, the drive DC power can be supplied from the integrated control device 10 to the thermal camera device 9 in the OTA chamber 50 via the DC power supply cable 18.

As described above, the measuring device 1A according to the present embodiment has the far-infrared LED 9a1 which is a light source for radiating far-infrared rays, the light receiving sensor 9a2 for receiving far-infrared rays, and the power supply unit 9a3 in the internal space 52 of the OTA chamber 50. A thermal camera device 9 that has and images the DUT 100 that is held or rotated by the DUT holding unit 56 is further provided.

With this configuration, the measuring device 1A according to the present embodiment has the same effect and effect as the measuring device 1 according to the first embodiment by having the camera device 8 using infrared rays, and the camera device 8 is displayed on the display unit 13. Based on the thermal image displayed together with the captured image of the above, the temperature of the DUT 100 to be monitored can also be monitored. Since the temperature of the DUT 100 becomes high when high-speed transmission / reception such as 5G communication is performed, it is also important to check the transmission / reception characteristics and the temperature of the DUT 100 during the protocol test. In order to confirm the temperature of the DUT 100, a control PC (integrated control device 10) connected to the thermal camera device 9 is mounted by mounting a thermal camera device 9 having a light receiving sensor 9a2 that receives far infrared rays inside the OTA chamber 50. ), The temperature of the DUT 100 can be monitored in parallel with the attitude monitoring of the DUT 100 under test, and the possibility of failure of the DUT 100 due to abnormal heat generation can be reduced.

In each of the above-described embodiments, an example of monitoring the posture of the DUT 100 during global scanning such as TIS and TRP measurement is given, but the present invention is not limited to this, and the protocol test, throughput, AFS, etc. are not limited to this. Needless to say, it can be applied to the attitude monitoring of the DUT 100 in the pitch-black internal space 52 in which the door 51a is closed, such as when the normal scanning (rotation) of the above is performed.

Further, although each of the above-described embodiments is premised on a configuration that does not have an existing LED lighting that consumes a large amount of power, the present invention can also have a configuration in which the LED lighting (LED for lighting) is used in combination. .. In this case, the lighting LED is not used during the measurement of the DUT 100 with the door 51a of the OTA chamber 50 closed, but is used as the lighting for work such as when the door 51a is opened. Can be done. Further, even when the lighting LED is driven during measurement, in order to avoid heat generation as much as possible, for example, the brightness is acquired from the captured image of the camera device 8, and the illumination LED emits light according to the acquired brightness. A configuration may be provided in which a light emitting amount adjustment control function for adjusting the amount is added.
The present invention can be applied not only to an anechoic box but also to an anechoic chamber.

As described above, the anechoic box, the measuring device, and the attitude monitoring method to be tested according to the present invention suppress the heat generation inside the box and the switching noise due to the power supply, and the test inside the box is performed without deteriorating the measurement accuracy. It has the effect of being able to reliably monitor the posture of the target, and is useful for an anechoic box for measuring a wireless terminal capable of using the 5G NR band, a measuring device, and a general method for monitoring the posture of the target to be tested.

1, 1A measuring device 5 Test antenna (antenna)
6 Receiving antenna (antenna)
7 Reflector 8 Camera device 8a Camera body 8a1 Infrared LED (light source)
8a2 Light receiving sensor 8a3 Power supply unit 8b Camera holding unit 8b1 Housing unit (housing)
8b3 opening 8c radio wave absorber (radio wave absorber)
9 Thermal camera device 9a1 Far infrared LED (light source)
9a2 Light receiving sensor 9a3 Power supply unit 10 Integrated control device (external device, control device)
11d1 USB port 18 DC power supply cable (USB cable)
20 NR system simulator (measuring device)
30 Wireless communication analyzer (measuring device)
50 OTA chamber (anechoic box)
51 Housing body (housing)
51k fan (fan device)
51h access panel (external connection panel, power supply unit)
52 Internal space 53g USB terminal 55 Radio wave absorber 56 DUT holding part (turntable)
56c DUT mounting part 56d mounting tray (fixing jig)
100 DUT (subject to test)
110 antenna

Claims (11)

A housing portion (51) having an internal space (52) in which radio waves from the surroundings are blocked, and
A turntable (56) provided in the internal space to rotate an object to be tested (100) for transmitting or receiving a wireless signal by fixing it to a fixing jig (56d).
The object to be tested, which has a light source (8a1) that emits infrared rays, a light receiving sensor (8a2) that receives infrared rays, and a power supply unit (8a3), is installed in the internal space and is rotated by the turntable. Camera device (8) for imaging and
A power supply unit (51h) that is connected to the external device (10) by a DC power supply cable (18) and supplies DC power to the power supply unit by the DC power supply cable.
An anechoic box characterized by having. The first aspect of claim 1, wherein the power supply unit is connected to the external device by a USB cable as the DC power supply cable, and supplies the DC power supply from the external device via the USB cable. Radio anechoic box. The camera device has a camera body portion (8a) in which the light source and the light receiving sensor are arranged on the same surface and an opening (8b3) on one side surface so that the light source and the light receiving sensor can be seen through the opening. Has a metal housing (8b) for accommodating the camera body.
The housing is characterized in that a radio wave absorber (8c) is attached to the one side surface so as to cover the area narrower than the opening to the outer peripheral portion of the opening, leaving the periphery of the light source and the light receiving sensor. The radio wave anechoic box according to claim 1 or 2. The housing portion is further provided with a reflector (7) that reflects the radio signal in the internal space.
The anechoic box according to any one of claims 1 to 3, wherein the camera device is arranged at a position avoiding a propagation path of the radio signal passing through the reflector. The camera device is located between the reflector and the test object on the radio signal propagation axis (RS2) between the reflector and the test object, and is located in the vertical direction orthogonal to the propagation axis. The anechoic box according to claim 4, wherein the anechoic box is arranged on any of the upper surface of the internal space or the four side surfaces of the internal space parallel to the propagation axis so as to be higher than the reflector. .. The housing portion is further provided with an antenna (6) for transmitting or receiving the radio signal reflected by the reflector on the bottom surface (52a) of the internal space.
A radio wave absorber (55) is installed on the bottom surface of the internal space so as to cover the antenna while avoiding the propagation path of the radio signal, and on the upper surface and the four side surfaces of the internal space, respectively. The anechoic box according to claim 4 or 5, wherein a radio wave absorber covering the surface is provided. The camera device has a distance of 450 mm or more and 600 mm or less from the center of the fixing jig, and the direction from the camera device toward the center of the fixing jig and the center of the fixing jig to the center of the fixing jig. The anechoic box according to any one of claims 1 to 6, wherein the angle formed by the height direction to the upper surface of the internal space is larger than 0 ° and 42 ° or less. The anechoic box according to any one of claims 1 to 7, wherein a fan device (51k) for cooling the internal space is further arranged in the housing portion. The test subject has a light source (9a1) that emits far infrared rays, a light receiving sensor (9a2) that receives far infrared rays, and a power supply unit (9a3), which are installed in the internal space and rotated by the turntable. The anechoic box according to any one of claims 1 to 8, further comprising a thermal camera device (9) for imaging an object. The radio wave anechoic box according to any one of claims 1 to 9, and the transmitted / received signal between the antennas (5, 6) arranged outside the housing and provided in the internal space and the test object. Based on this, a measuring device (20, 30) for performing a measurement related to the performance test of the object to be tested and a control device (10) arranged as the external device and controlling the measuring device are provided.
The radio wave anechoic box has an external connection panel (51h) provided with a USB terminal (53 g) in which the power supply unit is connected to the power supply unit by wiring in the internal space.
The control device has a USB port (11d1), and supplies a DC power supply to the power supply unit of the camera device via a USB cable (18) connected between the USB port and the USB terminal of the external connection panel. A measuring device characterized by supplying. The anechoic box according to any one of claims 1 to 9, the turntable arranged as the external device, and a control device (10) for driving and controlling the camera device are provided. A method for monitoring the posture of the subject to be tested, which monitors the posture of the subject to be tested in the internal space.
A DC power supply is supplied to the power supply unit of the camera device via a USB cable (18) connected between the USB port (11d1) of the control device and the USB terminal (53 g) of the external connection panel (51h) of the housing unit. And the step (S4) of driving the camera device so as to image the object to be tested.
In the step (S5) of acquiring the image pickup signal of the camera device via the USB cable,
A step (S6) of displaying the captured image of the test object on the display unit based on the imaging signal of the camera device, and
A posture monitoring method for a subject to be tested, which comprises.