JP2019109137A - Radiated emissions measurement device and radiated emissions measuring method - Google Patents

Abstract

To provide a radiated emissions measurement device that can precisely detect the maximum electric field intensity of radiated emissions in frequencies to be measured.SOLUTION: A radiated emissions measurement device comprises: a measurement apparatus, which measures time domain signals in which electromagnetic waves radiated from an object to be measured temporally continues, obtains frequency domain signals corresponding to time domain signals for each first time period based on the measured time domain signals, and outputs frequency domain information for each second time period based on the obtained frequency domain signals; and a controller, which controls a mechanism changing relative positions between the object to be measured and antennas, and obtains the frequency domain information outputted from the measurement apparatus. The frequency domain information for each second time period is obtained from using the entire time domain signals from a first clock through to a second clock, and from two pieces of the frequency domain information whose first clocks are the closest and that differ one another, the first clock of the one with temporally late frequency domain information is equal to or earlier than the second clock of the one with temporally early frequency domain information.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radiation interference wave measuring apparatus and a radiation interference wave measuring method.

  Conventionally, in a radiation interference wave test for measuring a radiation interference wave emitted from an electronic device or the like, the electric field intensity of the radiation interference wave is measured for a fixed time at a position where the electric field intensity of the radiation interference wave is maximum. It is performed to check whether or not the value is less than the allowable value of the standard (see Patent Document 1).

Japanese Patent Application Publication No. 2001-330636

  In the prior art, the spectrum analyzer measures the frequency spectrum while sweeping the frequency at which the radiation interference wave can be measured with the bandwidth of the predetermined resolution every predetermined time (sampling time). For this reason, in the prior art, it is difficult to capture the radiation interference wave when the radiation interference wave is generated at a frequency other than the frequency while measuring the radiation interference wave of a certain frequency by the spectrum analyzer It is. For this reason, it has been difficult in some cases to accurately detect the maximum electric field strength of the radiation interference wave with the electric field strength obtained by the measurement by the spectrum analyzer.

  The present invention has been made in consideration of the above circumstances, and a radiation interference wave measuring apparatus and a radiation interference wave measuring method capable of accurately detecting the maximum electric field strength of the radiation interference wave at the frequency to be measured. The task is to provide.

  One aspect of the present invention measures a temporally continuous time-domain signal of the electromagnetic wave received by an antenna that receives an electromagnetic wave emitted from a device under test, based on the measured time-domain signal. A measuring device for acquiring a frequency domain signal corresponding to the time domain signal for each time of time, and outputting second frequency domain information for every second time based on the acquired frequency domain signal, the object to be measured, and the antenna And a control unit configured to control a mechanism for changing the relative position between the frequency domain information and the frequency domain information, and acquiring the frequency domain information output from the measuring device; It is obtained by using all of the time domain signals at least once from the time to the second time later than the first time, and the two different frequency domain information closest to the first time However, the first time of the frequency domain information whose time is later than the first time is the same as or later than the second time of the frequency domain information whose time is earlier than the first time. Also, it is a radiation interference wave measuring device.

  In the radiation disturbance wave measuring apparatus according to one aspect of the present invention, the measurement device measures the time domain signal, and corresponds to the time domain signal for each first time based on the time domain signal. The process of acquiring a frequency domain signal is performed in parallel in time.

  In the radiation disturbance wave measuring apparatus according to one aspect of the present invention, the timing at which the frequency domain information is output from the measuring device and the timing at which the frequency domain information is acquired by the control unit are synchronized with each other. Is the timing of a fixed cycle.

  In the radiation disturbance wave measuring apparatus according to one aspect of the present invention, the control unit keeps changing the relative position of the object to be measured and the antenna at a predetermined speed in a predetermined measurement period, and the control unit A storage unit that associates each of the frequency domain information acquired from the measuring instrument with a representative point of the relative position of the object to be measured and the antenna when each of the frequency domain information is obtained Remember to

  In the radiation disturbance wave measuring apparatus according to one aspect of the present invention, the frequency domain information per second time is the frequency domain information per first time or a predetermined time longer than the first time. In the case where the frequency domain information per hour is the frequency domain information per second predetermined time which is longer than the first time, the frequency domain information per second time per second time The frequency domain information is information obtained using the plurality of first frequency domain information for each time period.

  In one aspect of the present invention, a measuring device measures a temporally continuous time-domain signal of the electromagnetic wave received by an antenna that receives an electromagnetic wave emitted from an object to be measured, and measures the time-domain signal. Acquiring a frequency domain signal corresponding to the first time domain signal per time domain, and outputting a second frequency domain information per hour based on the acquired frequency domain signal; The mechanism for changing the relative position between the measurement body and the antenna is controlled to obtain the frequency domain information output from the measuring instrument, and the frequency domain information for each second time is a first one. The frequency domain information is obtained by using all of the time domain signals at least once from the time of one to the second time later than the first time, and the two different frequency domain information closest to the first time is of However, the first time of the frequency domain information whose time is later than the first time is the same as or later than the second time of the frequency domain information whose time is earlier than the first time. It is also an early, radiation disturbance measurement method.

  According to the present invention, it is possible to provide a radiation interference wave measuring apparatus and a radiation interference wave measuring method capable of accurately detecting the maximum electric field strength of the radiation interference wave at the frequency to be measured.

It is a figure which shows an example of the radiation disturbance wave measurement system of 1st Embodiment. It is a figure which shows the example of a drive of the antenna movement mechanism of 1st Embodiment, a rotation mechanism, and an antenna rotation mechanism. It is a figure showing an example of composition of a control device of a 1st embodiment. It is a figure which shows an example of the processing timing of the time-domain signal of 1st Embodiment, and a frequency-domain signal. It is a flowchart which shows an example of operation | movement of the radiation interference wave measurement system of this embodiment. It is a figure which shows an example of the timing which the control apparatus of 2nd Embodiment acquires a frequency domain signal. It is a figure which shows the other example of the timing which the control apparatus of 2nd Embodiment acquires a frequency domain signal.

Preferred embodiments of the present invention will be described in detail with reference to the drawings.
The present invention is not limited by the contents described in the following embodiments. In addition, the components described below include those which can be easily conceived by those skilled in the art, substantially the same components, and equivalents. Furthermore, the components described below can be combined as appropriate. In addition, various omissions, replacements or modifications of the components can be made without departing from the scope of the present invention.

First Embodiment
FIG. 1 is a diagram showing an example of the radiation interference wave measurement system 1 according to the first embodiment. The radiation disturbance wave measurement system 1 includes a control device 10, an antenna moving mechanism 21, a rotation mechanism 22, an antenna rotation mechanism 23, an antenna 30, and a measuring device 40. The radiation disturbance wave measurement system 1 is disposed, for example, inside the anechoic chamber. The radio anechoic chamber has a metal floor surface and a wall surface to which a radio wave absorber is attached. The metal floor is a ground plane. The radiation interference wave measurement system 1 is an example of a radiation interference wave measurement device.

  The radiation interference wave measurement system 1 measures the radiation interference wave radiated from the measured object 50 in accordance with, for example, the EMC standard or the CISPR (CISPR) 16-2-3 standard. Specifically, the radiation interference wave measurement system 1 measures the radiation interference wave of the object to be measured 50 rotated by 15 degrees by the rotation mechanism 22 in accordance with the EMC standard or the Syspul 16-2-3 standard. Here, the antenna movement mechanism 21 and the rotation mechanism 22 are an example of a mechanism for changing the relative position of the antenna 30 and the object to be measured 50. The angle at which the object to be measured 50 is rotated may be every angle other than 15 degrees.

  The antenna moving mechanism 21 is attached to the antenna mast M and supports the antenna 30. The antenna mast M is a pillar disposed vertically to the plane on which the antenna mast M is installed. The surface on which the antenna mast M is installed is, for example, a floor surface F. The antenna moving mechanism 21 moves the antenna 30 along the antenna mast M based on the control performed by the control device 10. That is, the antenna 30 moves in the vertical direction with respect to the floor surface F by the drive of the antenna moving mechanism 21. In the present embodiment, the range in the vertical direction in which the antenna moving mechanism 21 moves the antenna 30 is substantially the same as the vertical length of the antenna mast M. In the present embodiment, it is assumed that the floor surface F is a flat surface, and the direction perpendicular to the floor surface F coincides with the direction of gravity and the opposite direction (upper and lower direction) of gravity. Note that another positional relationship may be used as the positional relationship between the plane on which the antenna mast M is installed and the moving direction of the antenna 30.

  The rotation mechanism 22 rotates an object disposed on the rotation mechanism 22 based on the control performed by the control device 10. The rotation mechanism 22 is, for example, a rotary table. In the present embodiment, a stand (hereinafter referred to as a stand B) is disposed on the rotation mechanism 22. Then, on the table B, an apparatus (referred to as an object to be measured 50) to be an object to be measured (measurement object) by the measuring device 40 is disposed. The rotation mechanism 22 rotates the base B and the object to be measured 50 around a rotation axis AX in a direction (vertical direction) orthogonal to the floor surface F based on the control performed by the control device 10. The rotation mechanism 22 is preferably disposed such that the rotation axis AX of the rotation mechanism 22 and the antenna mast M are parallel (or substantially parallel), and in this embodiment, such an arrangement is employed.

  The antenna rotation mechanism 23 and the antenna 30 are connected, and the antenna rotation mechanism 23 rotates the antenna 30 based on the control performed by the control device 10 and changes the installation direction of the antenna 30 by 90 degrees. Depending on the installation direction of the antenna 30, the polarization that can be received by the antenna 30 changes. The antenna rotation mechanism 23 includes, for example, a motor.

  The object to be measured 50 may be arranged on the rotation mechanism 22 without passing through the table B. Moreover, as the to-be-measured body 50, arbitrary things may be used, for example, IT apparatuses, such as a computer and a portable apparatus, may be used.

  The antenna 30 receives an electromagnetic wave emitted by the object to be measured 50. The antenna 30 receives an electromagnetic wave (for example, horizontal polarization) emitted by the object to be measured 50. The measuring device 40 and the antenna 30 are connected so as to transmit and receive information, and the measuring device 40 measures the electric field intensity of the electromagnetic wave received by the antenna 30 as the electric field intensity of the electromagnetic wave emitted by the object 50 Do. After the measurement of the horizontal polarization by the measuring device 40 is completed, the radiation interference wave measurement system 1 rotates the antenna 30 by 90 degrees by the antenna rotation mechanism 23. Thereby, the antenna 30 receives different polarized waves (for example, vertical polarized waves) of the electromagnetic wave emitted by the measured object 50 by the setting direction being changed by the antenna rotation mechanism 23.

  The antenna 30 may be an antenna capable of simultaneously measuring horizontal polarization and vertical polarization of an electromagnetic wave. In this case, the radiation interference wave measurement system 1 may not include the antenna rotation mechanism 23. In addition, the radiation disturbance wave measurement system 1 is configured to include two antennas: an antenna capable of measuring horizontal polarization of an electromagnetic wave and an antenna capable of measuring vertical polarization of the electromagnetic wave. In this case, for example, information based on reception results by these two antennas is summed.

  The measuring device 40 is a device that measures the electric field intensity of the electromagnetic wave received by the antenna 30 as a signal on the time axis (time domain) (hereinafter referred to as a time domain signal St). Further, the measuring device 40 acquires a signal of the frequency axis (frequency domain) (hereinafter referred to as a frequency domain signal Sf) based on the acquired time domain signal St. The measuring device 40 converts, for example, the time domain signal St into a frequency domain signal Sf by conversion processing such as fast Fourier transform. The measuring device 40 is, for example, a real time spectrum analyzer, and can perform measurement of the time domain signal St and fast Fourier transformation to the frequency domain signal Sf in parallel. The measuring device 40 measures the time domain signal St continuously in time from the start to the end of the measurement of the electromagnetic wave emitted by the object to be measured 50.

<Overview of each mechanism>
FIG. 2 is a view showing a driving example of the antenna movement mechanism 21, the rotation mechanism 22 and the antenna rotation mechanism 23 of the first embodiment. The rotating mechanism 22 constantly rotates the object to be measured 50 in a predetermined rotation direction at a constant speed based on the control performed by the controller 10 during the measurement of the radiation disturbance wave. The antenna 30 is, for example, an electromagnetic wave radiated from the object to be measured 50, and is a predetermined distance from the rotation axis AX of the rotation mechanism 22 in a direction perpendicular to the rotation axis AX (a distance r shown in FIG. 2). Measure the electromagnetic wave at a position far away. The distance r is, for example, a distance from the rotation axis AX of the rotation mechanism 22 to the antenna 30. Here, the object to be measured 50 is disposed at a position where the rotation axis AX of the rotation mechanism 22 passes through the object to be measured 50 or a position near the rotation axis AX. Therefore, the distance r is the same as (or substantially the same as) the distance from the object 50 to the antenna 30. In this case, the measurement result measured by the measuring device 40 is a cylinder having a circle with a radius r centered on the rotation axis AX as the distance r and a height substantially the same as the vertical length of the antenna mast M Measurement results of the area present on the side of the That is, the measurement result measured by the measuring device 40 is the result of measurement of the electromagnetic wave on the side surface of such a cylinder. FIG. 2 shows points (also referred to as representative points MP) on the side surface of such a cylinder.

  In the measurement of the radiation disturbance wave, first, the antenna moving mechanism 21 stops the antenna 30 at the lower side of the antenna mast M. At the lower side of the antenna mast M, the antenna 30 is disposed at a position such as 1 m from the floor surface F, for example. The antenna moving mechanism 21 moves the antenna 30 by a predetermined height in a direction (upward) away from the floor surface F and stops it each time the object to be measured 50 is rotated by one turn by the rotation mechanism 22. The predetermined height is preferably, for example, a length equal to or less than a half wavelength of the wavelength of the maximum frequency of the electromagnetic wave measured by the measuring device 40 (that is, the shortest wavelength λ). Such movement of the antenna 30 is repeated, and when the antenna 30 reaches a height at which the antenna 30 is located on the upper side of the antenna mast M, the movement of the antenna 30 is ended after being rotated by one turn. The upper side of the antenna mast M is, for example, a position such as 4 m from the floor surface F.

  Thus, the antenna moving mechanism 21 raises the antenna 30 by a predetermined height from the position of the lower end of the antenna mast M to the position of the upper end every time the object 50 is rotated by one rotation. As another example of the operation, the antenna moving mechanism 21 may lower the antenna 30 by a predetermined height from the upper end to the lower end of the antenna mast M.

  The measuring device 40 acquires the frequency domain signal Sf corresponding to the portion based on the time domain signal St measured while the object 50 is rotated by the antenna rotation mechanism 23 by a predetermined angle. In the present embodiment, the predetermined angle is 15 degrees. The measuring device 40 outputs information based on the frequency domain signal Sf to the control device 10 at predetermined time intervals. In the present embodiment, the predetermined time interval is the time until the object 50 is rotated by 15 degrees by the antenna rotation mechanism 23.

<Configuration of Control Device 10>
FIG. 3 is a diagram illustrating an example of the configuration of the control device 10 according to the first embodiment. As shown in FIG. 3, the control device 10 includes a main control unit 100, an input device 110, an output device 120, a communication unit 130, a storage unit 140, and an internal bus 150. Each unit (main control unit 100, input device 110, output device 120, communication unit 130, and storage unit 140) included in control device 10 is connected to be able to transmit and receive information via internal bus 150.

  The input device 110 is, for example, a keyboard, a mouse, a touch pad, and the like. Various types of information are input to the input device 110 by an operation performed by the user of the radiation interference wave measurement system 1. For example, contents of various settings relating to measurement of an electromagnetic wave emitted by the object to be measured 50 are input to the input device 110. The contents of the various settings may be, for example, information indicating the moving speed or moving direction of the antenna moving mechanism 21 and information indicating the rotational speed or rotating direction of the rotating mechanism 22. The various settings may be, for example, initial settings or change settings.

  The output device 120 is, for example, a display device including a liquid crystal display panel or an organic EL (ElectroLuminescence) display panel. The output device 120 outputs information indicating the measurement result of the electromagnetic wave emitted by the object to be measured 50 and the like. Further, the output device 120 is connected to, for example, a collection device that collects various types of information via a network, and outputs information indicating a measurement result of an electromagnetic wave emitted by the object to be measured 50 to the collection device. You may

  The control device 10 communicates with the antenna movement mechanism 21, the rotation mechanism 22, the antenna rotation mechanism 23 and the measuring device 40 via the communication unit 130. The control device 10 outputs, to the antenna moving mechanism 21 via the communication unit 130, information necessary for the antenna moving mechanism 21 to move the antenna 30, which is the information input to the input device 110. The information required when the antenna moving mechanism 21 moves the antenna 30 is, for example, information on the moving speed of the antenna 30 and the movement start timing of the antenna 30. In addition, the control device 10 outputs, to the rotation mechanism 22 via the communication unit 130, information that is input to the input device 110 and is necessary when the rotation mechanism 22 rotates the object to be measured 50. The information required when the rotation mechanism 22 rotates the measured object 50 is, for example, information on the rotation speed of the measured object 50 and the rotation start timing of the measured object 50. In addition, the control device 10 receives the information input to the input device 110, which is necessary when the antenna rotation mechanism 23 changes the installation direction of the antenna 30, to the antenna rotation mechanism 23 via the communication unit 130. Output.

  The main control unit 100 executes a program (software) stored in the storage unit 140 by a hardware processor such as a CPU (Central Processing Unit) to perform functions of the drive control unit 101 and the electric field strength analysis unit 102. Realize as a department. Some or all of these components are realized by hardware such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), and GPU (Graphics Processing Unit). Or may be realized by cooperation of software and hardware. The storage unit 140 is realized by, for example, a read only memory (ROM), a flash memory, a secure digital (SD) card, a random access memory (RAM), a register, or the like. The storage unit 140 stores measurement information 141. In the present embodiment, information in which information representing a representative point MP and information based on a frequency domain signal Sf corresponding to the representative point MP are associated is used as the measurement information 141.

  The drive control unit 101 controls the operations of the antenna movement mechanism 21, the rotation mechanism 22, and the antenna rotation mechanism 23 based on various information input from the input device 110. Drive control unit 101 is configured to control antenna moving mechanism 21, rotation mechanism 22 and antenna rotation mechanism 23 based on the information input to input device 110, and is used as information stored in storage unit 140. The configuration may be such that the antenna moving mechanism 21, the rotation mechanism 22, and the antenna rotation mechanism 23 are controlled based on them. In the present embodiment, the drive control unit 101 controls the antenna movement mechanism 21, the rotation mechanism 22, and the antenna rotation mechanism 23 based on the information indicating the initial setting stored in the storage unit 140.

  The electric field strength analysis unit 102 analyzes the electric field strength of the electromagnetic wave emitted by the object to be measured 50 using the information based on the frequency domain signal Sf acquired from the measuring device 40. The electric field strength analysis unit 102 specifies, for example, a part where the frequency domain signal Sf has the strongest (large) value using the information based on the acquired frequency domain signal Sf. In the present embodiment, the location may be identified using the representative point MP. The output device 120 displays the representative point MP specified by the electric field strength analysis unit 102. As another example, the field strength analysis unit 102 may specify a point at which the frequency domain signal Sf indicates a value whose field strength is stronger (larger) than a predetermined threshold value.

<Processing Timing of Time-Domain Signal St and Frequency-Domain Signal Sf>
FIG. 4 is a diagram showing an example of processing timing of the time domain signal St and the frequency domain signal Sf according to the first embodiment. In the example shown in FIG. 4, time t1 is the time when the measuring device 40 starts measurement. Further, the position P1 is a position on the circumference of a circle having a radius r centered on the rotation axis AX at a distance r, and the position closest to the antenna 30 at the timing when the measuring device 40 starts measurement In the embodiment, it is a position coincident with the antenna 30). In the following description, the time when the object to be measured 50 is rotated by (15 × n) degrees from the angle at time t1 is referred to as time t (n + 1). Further, at time t (n + 1), the length of the radius centered on the rotation axis AX is a position on the circumference of the circle of the distance r and is the closest position to the antenna 30 (in the present embodiment, The coincident position) is described as a position P (n + 1). Here, n is a natural number.

  As described above, the measuring device 40 measures the time domain signal St continuously in time. Further, the measuring device 40 obtains the frequency domain signal Sf corresponding to the portion based on the time domain signal St of the portion measured while the object 50 is rotated by 15 degrees by the antenna rotation mechanism 23. . In the following description, in the time domain signal St, a portion (target segment) for acquiring the frequency domain signal Sf is referred to as an FFT target segment. In the present embodiment, the FFT target section and the section in which the object 50 is rotated by 15 degrees by the antenna rotation mechanism 23 coincide with each other. Therefore, as shown in FIG. 4, in the present embodiment, two adjacent FFT target sections are continuous in time. The temporally continuous time domain signal St is divided into FFT target sections, and all of the divided respective sections are converted into frequency domain signals Sf. In the following description, a plurality of consecutive FFT target sections are described as an FFT target section Z1, an FFT target section Z2,..., An FFT target section Zm. m is a natural number. In addition, the frequency domain signal Sf obtained by converting the FFT target section Z1, the FFT target section Z2, ..., and the FFT target section Zm by FFT (Fast Fourier Transform) into a frequency domain signal Sf1, The frequency domain signals Sf2, ..., and the frequency domain signals Sfm are described.

  As shown in FIG. 4, the measuring device 40 performs the process of measuring the time domain signal St and the process of acquiring the frequency domain signal Sf in parallel. Here, the time taken by the measuring instrument 40 to obtain the frequency domain signal Sf is shorter than the FFT target zone Z. The measuring device 40 outputs frequency domain signal information (hereinafter referred to as frequency domain signal information SfI) indicating the frequency domain signal Sf to the control device 10. Here, the timing when the process of the measuring device 40 outputting the frequency domain signal information SfI to the control device 10 is performed, and the timing when the process of the control device 10 acquiring the frequency domain signal information SfI from the measuring device 40 are performed, They are synchronized, and match (or substantially match) in the present embodiment. This timing is timing of a fixed cycle. In the example shown in FIG. 4, this period matches the period of the FFT target section Z.

  Control device 10 obtains position P (n) at the timing when frequency domain signal information SfI acquired from measuring instrument 40 and time domain signal St which is the original data of frequency domain signal Sf corresponding to frequency domain signal information SfI are acquired. Alternatively, the position P (n + 1) is associated with the measurement information 141. In this case, the representative point MP is the position P or the position P (n + 1). As another example, control device 10 measures frequency domain signal information SfI and a point (representative point MP in this case) such as a position intermediate between position P (n) and position P (n + 1). You may associate as. In the present embodiment, the portion of the time-domain signal St in the FFT target zone Z1 reflects the measurement result from the position P1 to the position P2, and the same applies to the FFT target zone Z2 and thereafter. Further, although the frequency domain signal information SfI based on the frequency domain signal Sf is information indicating the frequency domain signal Sf itself in the present embodiment, the information may be information obtained by processing the frequency domain signal Sf as another example. Good.

<Operation of Radiation Interference Measurement System 1>
FIG. 5 is a flowchart showing an example of the operation of the radiation disturbance wave measurement system 1 according to the first embodiment. The drive control unit 101 reads out the information of the initial setting of the antenna moving mechanism 21 and the rotating mechanism 22 from the storage unit 140, and performs the setting for operating the antenna moving mechanism 21 and the rotating mechanism 22 based on the read information of the initial setting. Perform (step S110). Next, the rotation mechanism 22 starts the rotation of the object to be measured 50 based on the control of the drive control unit 101 (step S120). Next, the measuring device 40 starts measurement processing of the electromagnetic wave emitted by the object to be measured 50 (step S130). The measurement process includes a process of measuring a temporally continuous time domain signal St, a process of acquiring a frequency domain signal Sf of the FFT target section Z, and frequency domain signal information SfI based on the acquired frequency domain signal Sf. And a process of outputting to the control device 10 at predetermined time intervals.

  In the present embodiment, the antenna 30 is initially disposed at the lower end of the antenna mast M. The drive control unit 101 does not operate the antenna moving mechanism 21 and does not operate the height of the antenna 30 while the measurement is not completed until the measured object 50 makes one revolution at the same height (step S140; NO). Not change. On the other hand, when measurement is performed until the measured object 50 makes one revolution at the same height (step S140; YES), the drive control unit 101 determines whether to operate the drive control unit 101 or not. It determines (step S150). That is, when the position of the antenna 30 is not the upper end of the antenna mast M (step S150; NO), the drive control unit 101 operates the antenna moving mechanism 21 to raise the antenna 30 by a predetermined height (step S160). . After the process of step S160, the control device 10 causes the process to proceed to step S140.

  On the other hand, when the position of the antenna 30 is the upper end of the antenna mast M (step S150; YES), the drive control unit 101 ends the operation of the antenna rotation mechanism 23 (step S170). Next, for example, based on the control of the control device 10, the measuring device 40 ends the measurement process (step S180). Next, the electric field strength analysis unit 102 analyzes the electric field strength of the electromagnetic wave emitted by the object to be measured 50 based on the frequency domain signal information SfI acquired from the measuring device 40 (step S190). For example, based on the acquired frequency domain signal information SfI, the field strength analysis unit 102 identifies a portion where the frequency domain signal Sf corresponding to the frequency domain signal information SfI has the strongest field strength, and Identify a representative point MP corresponding to the location. The output device 120 outputs information on the result analyzed by the electric field strength analysis unit 102 (step S200).

Summary of First Embodiment
As described above, the radiation disturbance wave measurement system 1 of the present embodiment measures the temporally continuous time-domain signal St of the electromagnetic wave received by the antenna 30 that receives the electromagnetic wave emitted from the device under test 50. The frequency domain signal Sf corresponding to the time domain signal St for each first time (in the present embodiment, the FFT target zone Z) is acquired based on the measured time domain signal St, and the acquired frequency domain signal Sf is acquired. Measuring device 40 for outputting frequency domain information for each second time (in the present embodiment, the FFT target section Z) based on the above, and a mechanism for changing the relative position between the measured object 50 and the antenna 30 (this embodiment The controller 10 controls the antenna movement mechanism 21 and the rotation mechanism 22), and acquires the frequency domain signal information SfI output from the measuring device 40. In the radiation disturbance wave measurement system 1 of the present embodiment, the second frequency domain signal information SfI every second time is a first one that is later than the first time from the first time (in the present embodiment, time t (n)). It is obtained using all of the time domain signal St up to time 2 (in this embodiment, time t (n + 1)). Further, in the radiation interference wave measurement system 1 of the present embodiment, of the frequency domain signal information SfI of the adjacent FFT target zone Z, the time of the start of the frequency domain signal information SfI whose time of the FFT target zone Z is temporally late. Is the same as the time at the end of the FFT target section Z of the frequency domain signal information SfI, which is earlier in time in the FFT target section Z.

  Thereby, the radiation disturbance wave measurement system 1 of the present embodiment can measure the frequency domain signal Sf of the electromagnetic wave emitted by the object 50 by the measuring device 40 continuously in time. The electromagnetic wave of the frequency which can be measured can be measured at any time. Therefore, the radiation interference wave measurement system 1 of the present embodiment can accurately detect the maximum electric field strength of the radiation interference wave at the frequency to be measured.

  Further, in the radiation disturbance wave measurement system 1 of the present embodiment, the measuring device 40 measures the time domain signal St, and the frequency corresponding to the time domain signal St for each FFT target section Z based on the time domain signal St. The process of acquiring the area signal Sf is performed in parallel in time. Thereby, the radiation interference wave measurement system 1 of this embodiment can shorten the time which acquires the frequency domain signal Sf of the electromagnetic waves which the to-be-measured body 50 radiates | emits by the measuring device 40. FIG.

  Further, in the radiation disturbance wave measurement system 1 of the present embodiment, the control device 10 keeps changing the relative position of the measured object 50 and the antenna 30 at a predetermined speed in a predetermined measurement period. In the present embodiment, the antenna rotation mechanism 23 keeps rotating the measured object 50 at a predetermined speed. The control device 10 sets the respective frequency domain signal information SfI acquired from the measuring device 40 and the representative point MP of the relative position of the measured object 50 and the antenna 30 when the respective frequency domain signal information SfI is obtained. , And stored in the storage unit 140 in association with each other. Thereby, the user can easily refer to the frequency domain signal Sf of the representative point MP.

Second Embodiment
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In the first embodiment, the case has been described where the FFT target section Z and the section until the measured object 50 is rotated by 15 degrees by the antenna rotation mechanism 23 coincide with each other. In the second embodiment, a case will be described in which the FFT target section Z and the section until the measured object 50 is rotated by 15 degrees by the antenna rotation mechanism 23 are different. In addition, about the structure similar to embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted.

<When the FFT target section Z is long>
FIG. 6 is a diagram showing an example of timing when the control device 10 of the second embodiment acquires the frequency domain signal Sf. As shown in FIG. 6, in this example, the FFT target section Z is longer than the section until the object 50 is rotated by 15 degrees by the antenna rotation mechanism 23. In this case, at the end time of the FFT target section Zm and the time of the start of the FFT target section Zm + 1, the time of the start of the FFT target section Zm + 1 is a faster time.

<About the case where the FFT target section Z is short>
FIG. 7 is a diagram showing another example of timing when the control device 10 of the second embodiment acquires the frequency domain signal Sf. As shown in FIG. 7, in this example, the FFT target section Z is shorter than the section until the object 50 is rotated by 15 degrees by the antenna rotation mechanism 23. As described above, the timing when the processing of the measuring device 40 to output the frequency domain signal information SfI to the control device 10 is performed, and the timing when the processing of the control device 10 acquiring the frequency domain signal information SfI from the measuring device 40 is performed. Synchronize.
In the present example, the measuring device 40 performs from the previous timing to the current timing at each periodic timing (in the present example, timing of a fixed cycle) at which the process of outputting the frequency domain signal information SfI to the control device 10 is performed. Are combined by performing statistical processing (for example, processing for calculating the maximum value, the minimum value, or the average value to obtain the result of combination). Then, the measuring device 40 acquires frequency domain signal information SfI based on the combined frequency domain signal Sf, and outputs the frequency domain signal information SfI to the control device 10 at the current timing. As a result, the frequency domain signal information SfI output to the control device 10 reflects all of the time domain signal St continuous in time.
Here, the frequency domain signal information SfI based on the combined frequency domain signal Sf is information indicating the combined frequency domain signal Sf itself in the present embodiment, but as another example, the combined frequency The area signal Sf may be processed information.

Summary of Second Embodiment
As described above, in the radiation interference wave measurement system 1 of the present embodiment, the frequency domain signal information SfI for each FFT target section Z is calculated from the first time (in the present embodiment, time t (n)). It is obtained using all of the time domain signal St up to the second time (in the present embodiment, time t (n + 1)) later than time 1. Further, in the radiation interference wave measurement system 1 of the present embodiment, of the frequency domain signal information SfI of the adjacent FFT target zone Z, the time of the start of the frequency domain signal information SfI whose time of the FFT target zone Z is temporally late. The time of the FFT target section Z is earlier than the time of the end of the FFT target section Z of the frequency domain signal information SfI, which is earlier in time (example in FIG. 6). Here, when the time domain signal St for acquiring the frequency domain signal Sf becomes longer, it is considered that the accuracy of the information obtained based on the frequency domain signal Sf may be higher. The radiation disturbance wave measurement system 1 of this embodiment acquires the frequency domain signal Sf based on the time domain signal St in a section longer than a section between adjacent positions (for example, between the position P1 and the position P2). By doing this, it is possible to obtain the frequency domain signal Sf more accurately.

  Further, in the radiation disturbance wave measurement system 1 of the present embodiment, the frequency domain signal information SfI for each FFT target section Z is based on the plurality of frequency domain signals Sf (in the present embodiment, two frequency domain signals Sf Combined) generated (example in FIG. 7). Thus, in the radiation interference wave measurement system 1 of the present embodiment, the frequency domain signal information SfI for each FFT target section Z is calculated from the first time from the first time (in the present embodiment, time t (n)). It is obtained using all of the time domain signal St up to the second time (in the present embodiment, the time t (n + 1)) that is too late. Further, in the radiation interference wave measurement system 1 of the present embodiment, of the frequency domain signal information SfI of the adjacent FFT target zone Z, the time of the start of the frequency domain signal information SfI whose time of the FFT target zone Z is temporally late. Is the same as the time at the end of the FFT target section Z of the frequency domain signal information SfI, which is earlier in time in the FFT target section Z.

  Thereby, in the emission disturbance wave measurement system 1 of the present embodiment, even when the FFT target section Z is at a timing shorter than the timing at which the control device 10 acquires the frequency domain signal information SfI from the measuring instrument 40, The frequency domain signal Sf of the electromagnetic wave emitted by the object to be measured 50 can be measured continuously in time, and the electromagnetic wave of the frequency that can be measured by the measuring device 40 is measured at any time. be able to. Therefore, the radiation interference wave measurement system 1 of the present embodiment can accurately detect the maximum electric field strength of the radiation interference wave at the frequency to be measured.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like within the scope of the present invention are also included.

DESCRIPTION OF SYMBOLS 1 ... Radiation interference wave measuring system, 10 ... Control apparatus, 21 ... Antenna moving mechanism, 22 ... Rotation mechanism, 30 ... Antenna, 40 ... Measurement device, 50 ... Measurement object, 100 ... Main control part, 101 ... Drive control part , 102: electric field strength analysis unit, 110: input device, 120: output device, 130: communication unit, 140: storage unit, 141: measurement information, 150: internal bus, 500: radiation source, 501: biconical antenna, 502 ... signal generator, AX ... rotation axis, d ... predetermined distance, M ... antenna mast, P ... position, MP ... representative point, Sf, Sfa, Sfb, Sfc, Sfd ... frequency domain signal, St, Sta, Stb, Stc , Std ... time domain signal

Claims (6)

The temporally continuous time domain signal of the electromagnetic wave received by the antenna receiving the electromagnetic wave radiated from the object to be measured is measured, and based on the measured time domain signal, the time domain per first time interval A measuring device for acquiring a frequency domain signal corresponding to the signal and outputting second frequency domain information per second time based on the acquired frequency domain signal;
A control unit that controls a mechanism that changes the relative position of the object to be measured and the antenna, and acquires the frequency domain information output from the measuring device;
Equipped with
The frequency domain information for each second time is obtained by using all of the time domain signals from a first time to a second time later than the first time at least once.
Among the two different pieces of frequency domain information that are closest to the first time, the first time of the frequency domain information that is temporally late as the first time is temporally the first time as the first time. The same as or earlier than the second time of the earlier frequency domain information,
Radiation interference measurement device. The measuring device is parallel in time processing of measuring the time domain signal and processing of acquiring the frequency domain signal corresponding to the time domain signal for each first time based on the time domain signal. To do,
The radiation interference wave measuring apparatus according to claim 1. The timing at which the frequency domain information is output from the measurement device and the timing at which the frequency domain information is acquired by the control unit are synchronized,
These timings are timings of a fixed cycle,
The radiation interference wave measuring device according to any one of claims 1 or 2. The control unit keeps changing the relative position of the measured object and the antenna at a predetermined speed during a predetermined measurement period.
The control unit is configured to indicate each of the frequency domain information acquired from the measuring device and a representative point of relative positions of the object to be measured and the antenna when each of the frequency domain information is obtained. Associate and store in storage unit,
The radiation interference wave measuring apparatus according to any one of claims 1 to 3. The frequency domain information of the second time interval is the frequency domain information of the first time interval or the frequency domain information of a predetermined time interval longer than the first time.
If the frequency domain information for each second time is the frequency domain information for each predetermined time longer than the first time, the frequency domain information for each second time may be a plurality of the plurality of It is information obtained by using the frequency domain information of one hour,
The radiation interference wave measuring apparatus according to any one of claims 1 to 4. A measuring device measures a temporally continuous time-domain signal of the electromagnetic wave received by the antenna that receives the electromagnetic wave emitted from the object to be measured, and a first time interval is measured based on the measured time-domain signal. Acquiring a frequency domain signal corresponding to the time domain signal, and outputting second frequency domain information per second based on the acquired frequency domain signal,
The control unit controls a mechanism for changing the relative position of the object to be measured and the antenna, and acquires the frequency domain information output from the measuring device,
Furthermore, the frequency domain information per second time can be obtained at least once using all of the time domain signals from a first time to a second time later than the first time. Of the two different pieces of frequency domain information closest to the first point of time, the first point of time of the frequency domain information that is temporally late in time is the time in which the first point of time is the first time. Equal to or earlier than the second time of the frequency domain information that is earlier
Radiation interference measurement method.

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