JP5678854B2 - Electromagnetic test equipment - Google Patents

Description

  The present invention relates to an electromagnetic wave testing apparatus that performs at least a resistance test of an electronic device using electromagnetic waves from the outside.

  Conventionally, the immunity test (hereinafter referred to as “EMS test”) for testing the resistance of electronic devices due to external interference waves and the like, and the magnitude of interference waves (noise generated by electronic devices, etc.) radiated from electronic devices are measured. Emission measurement (hereinafter referred to as “EMI measurement”) is known. An open field test site or an electromagnetic wave anechoic cell is used as an electromagnetic wave test apparatus that enables these EMS tests and EMI measurements.

  In the open field test site, an electronic device is placed on a support stand in the field, an antenna pole is set up at a position away from the electronic device, and the antenna is slidable in the vertical direction. The measuring instrument is connected with an antenna cable. When performing EMI measurement, an electromagnetic wave radiated from an electronic device is received by an antenna to measure whether the electromagnetic wave is below a specified value. When performing an EMS test, the electromagnetic wave is transmitted from the antenna. An electronic device is irradiated and an abnormal state in the electronic device, for example, malfunction of the electronic device is measured.

  By the way, at an open field test site, the test may not be possible depending on weather conditions such as rainfall, snowfall, and strong wind. In addition, the level of radiated electromagnetic wave noise of electronic equipment changes due to changes in the outside air temperature and the like, and it is difficult to obtain reproducibility of measurement results.

  In consideration of such circumstances, the electromagnetic wave anechoic cell is composed of a cell surrounded by an iron plate to shield external waves, and its inner peripheral wall and ceiling are made of a mixture of foamed urethane rubber and carbon. A wedge-shaped electromagnetic wave absorber is provided, and a support base, an antenna pole, and an antenna are installed in the cell in the same manner as described above, and the same test is performed on the target electronic device (for example, see Patent Document 1). ).

JP 2005-236595 A

  However, in the conventional anechoic cell (and open field test site), since a plurality of antenna elements constituting the antenna are connected to one signal generator via a distributor, in the EMS test, the frequency and amplitude There is a problem that it is difficult to inspect the resistance of an electronic device in an environment in which a plurality of types of electromagnetic waves having different (strength), phase, and modulation are mixed.

  In order to solve the above-described problems, an object of the present invention is to provide an electromagnetic wave test apparatus capable of irradiating a composite electromagnetic wave in an EMS test.

  An electromagnetic wave test apparatus that is an invention made to achieve the above object, as described in claim 1, includes an antenna having a plurality of antenna elements that radiate electromagnetic waves when a high-frequency signal is input, and each antenna element. A plurality of signal generators that are connected to the input terminals and generate high-frequency signals, and a measuring instrument.

The measuring device radiates an electromagnetic wave having a frequency, phase, modulation, and intensity set for each antenna element by controlling the frequency, phase, modulation, and amplitude of the high-frequency signal generated by the plurality of signal generators. In addition, it has an EMS control means for performing a resistance test of the electronic device by an electromagnetic wave from the outside based on an output (signal, image, etc.) from the electronic device placed on a support stand separated from the antenna.

  According to such a configuration, by radiating electromagnetic waves of different types such as frequency, intensity, phase, and modulation for each antenna element, it is possible to irradiate an electronic device with a composite electromagnetic wave in which electromagnetic waves of various frequencies are mixed. As a result, the tolerance test (EMC test) of the electronic device can be performed in a noise environment close to an assumed external environment.

  When performing an EMS test (and EMI measurement) using the electromagnetic wave test apparatus having such a configuration, an antenna may be installed in an anechoic chamber like a conventional electromagnetic wave anechoic cell, or an open field. An antenna may be installed outdoors like a test site.

By the way, in the configuration in which a plurality of antenna elements constituting the antenna are arranged horizontally and at equal intervals, as shown in FIG. 15A, the interval between adjacent antenna elements (hereinafter referred to as “element interval”) is set. d, when the amplitude of a _n of the high-frequency signal Sn is injected into the antenna elements located in n-th, the phase difference between the high-frequency signal Sn corresponding to adjacent antenna elements frequency signal Sn-1 [psi, a plurality of antennas The relationship between the combined directivity f of the elements and the phase difference ψ is expressed by the following equations (1) to (3).

In the above equations (2) and (3), k is a propagation constant, θ is a reference angle representing a certain reference direction, θ ₀ is an angle with respect to the reference direction, and two adjacent two It is an angle representing the combined directivity of the antenna element. According to the above equations (2) and (3), the angle θ ₀ is a value determined by the phase difference ψ and the element interval d, and u = 0 when θ = θ ₀ .

For example, element spacing d is half wavelength lambda / 2 for the wavelength lambda of the high-frequency signal into two phased array antenna consisting of antenna element (hereinafter referred to as "array antenna"), each antenna amplitudes a _n is equal to the high-frequency signal Assuming a case where elements are injected, θ = θ ₀ = 0 when the phase difference ψ = 0, and the main lobe representing the directivity of the array antenna faces the reference direction (antenna front direction). When the phase difference ψ = π / 2, θ ₀ = 30 °, and when the phase difference ψ = −π / 2, θ ₀ = −30 ° (where θ = 0). In this way, the direction of the main lobe of the array antenna can be changed from −30 ° to 30 ° (see FIGS. 15B and 15C).

  That is, the combined directivity of these two antenna elements can be changed by the value of the phase difference ψ of each high-frequency signal corresponding to two adjacent antenna elements, and as a result, the number of antenna elements is increased. The combined directivity f of a plurality of antenna elements can be changed by the above equation (1) (for details, see Naohisa Goto, “Illustrated / Antenna”, IEICE, Corona).

Therefore, as described in claim 1 , in the configuration in which the plurality of antenna elements constituting the antenna are arranged horizontally and at equal intervals, the plurality of signal generators are phase shifters that perform phase modulation of the high-frequency signal. EMS control means adjusts each phase of the electromagnetic wave radiated from the plurality of antenna elements according to the interval of the plurality of antenna elements via each phase shifter, and the interval between the plurality of antenna elements and By adjusting the combined directivity calculated from each phase, it is possible to irradiate an electromagnetic wave to a specific position from the antenna. As a result, it is possible to intensively test a specific electronic device that has malfunctioned in a test product in which a plurality of electronic devices are mounted in each part. In addition, in order to irradiate an electromagnetic wave to a specific position, you may use together the turntable mentioned later.

In the electromagnetic wave testing apparatus according to claim 1 , high-frequency signals having the same amplitude and frequency are generated in a plurality of signal generation units, and each phase shifter is controlled so as not to change the phase of these high-frequency signals. Thus, a uniform electromagnetic wave can be emitted from the antenna to the outside.

On the other hand, as described in claim 2 , each of the plurality of signal generation units includes a distributor that distributes the high-frequency signal to the plurality of antenna elements, and the EMS control means includes one of the plurality of signal generation units. By selectively operating, uniform electromagnetic waves can be emitted from the antenna to the outside.

  According to this configuration, it is possible to reduce the load on the device related to the control by reducing the number of objects to be controlled as compared with the case where all the signal generating units are operated. The plurality of signal generators may be configured to generate high-frequency signals having different natural frequencies in order to radiate electromagnetic waves having a frequency set in advance for each antenna element, or according to individual control commands. Alternatively, a high frequency signal having a variable frequency may be generated.

  By the way, in the conventional electromagnetic wave anechoic cell (and open field test site), in the EMI measurement, it is necessary to place one electronic device on a support base one by one, and thus a plurality of electronic devices are mounted on each part. When trying to measure one specimen, there was a problem that it was difficult to know from which electronic device in the specimen the electromagnetic wave exceeding the specified value was detected. Therefore, for this type of specimen, each electronic device before mounting must be individually measured, and time and effort have to be taken.

On the other hand, as described in claim 3 , the support base has a support surface on which a test product in which a plurality of electronic devices are mounted on each part is placed, and the center of the support surface is an axis. The plurality of antenna elements are arranged in parallel to the support surface above the turntable, and receive electromagnetic waves radiated from the specimen. The measuring instrument has EMI control means for measuring the electromagnetic wave radiated from the test sample based on the input signal from each antenna element.

  In the measuring instrument, when the EMI control means determines that the measured value of the electromagnetic wave exceeds the specified value, the position of the EUT is changed with respect to the antenna by driving and controlling the turntable. A configuration in which the position of an electronic device that emits an electromagnetic wave that exceeds a specified value can be specified based on an input signal from each subsequent antenna element.

  According to this configuration, in the EMI measurement, it is possible to easily specify the electronic device as the abnormal part of the test sample, and thereby shorten the measurement time. The specified value represents, for example, the intensity of the electromagnetic wave determined by the Radio Law, and is a value specified in advance for each electronic device or specimen.

Moreover, in the electromagnetic wave test apparatus according to claim 3, as described in claim 4 , the EMI control means specifies the position of the noise generation source which is an electronic device that emits an electromagnetic wave exceeding a specified value. In this case, noise information in which the position of the noise generation source is associated with the measured value of the electromagnetic wave based on the input signal from each antenna element is stored. When it is determined that the measured value of the electromagnetic wave exceeds the specified value after the next time, the position of the noise generation source can be specified by referring to the noise information based on the measured value of the electromagnetic wave.

  According to such a configuration, when the position of the noise generation source can be specified by using the noise information, it is possible to omit the above-described turntable drive control, and further reduce the measurement time. be able to. In the EMI control means, the correspondence with the EMS control means described above is that the position of the noise generation source is the electromagnetic wave irradiation position, the electronic device is the antenna element, the antenna element is the electronic device, and the input signal from the antenna element is from the electronic device. Therefore, the function of the EMI control means can be applied to the EMS control means.

It is explanatory drawing which shows the whole structure of the electromagnetic wave test apparatus of embodiment. It is a block diagram which shows the structure of the transmission / reception apparatus connected to the antenna element. It is explanatory drawing which shows the example of irradiation of the electromagnetic waves from an antenna element. It is a flowchart which shows the EMS test process which a measuring device performs. It is the 1st explanatory view showing an example of the simulation data in the EMS test processing. It is the 2nd explanatory view showing an example of the simulation data in the EMS test processing. It is the 3rd explanatory view showing an example of the simulation data in the EMS test processing. It is the 4th explanatory view showing an example of the simulation data in the EMS test processing. It is a flowchart which shows the EMI measurement process which a measuring device performs. It is a 1st explanatory view showing an example of simulation data in EMI measurement processing. It is the 2nd explanatory view showing an example of the simulation data in EMI measurement processing. It is explanatory drawing which shows the noise information in an EMI measurement process. It is explanatory drawing which shows an example of the method of pinpointing the position of a noise generation source. It is a matrix figure which shows the modification which concerns on arrangement | positioning of an antenna element. It is explanatory drawing which shows the relationship between a phase difference and the directivity of an antenna.

  A vehicle strip line as an electromagnetic wave test apparatus according to an embodiment to which the present invention is applied will be described below. The vehicle strip line of the present embodiment is for installing an automobile in an electromagnetic wave anechoic chamber and performing an EMS test and an EMI measurement on a plurality of vehicle parts including an electronic device by regarding the automobile as a specimen. . That is, a radio wave absorber is attached to the entire surface of the electromagnetic wave anechoic chamber, and when the radiated or reflected electromagnetic wave reaches the radio wave absorber, it is absorbed by the radio wave absorber.

  A vehicle strip line 1 according to this embodiment shown in FIG. 1 includes an indoor portion 10 installed in an electromagnetic wave anechoic chamber 3 and a measurement unit 20 installed in a measurement chamber 5 outside the electromagnetic wave anechoic chamber 3. . In the electromagnetic wave anechoic chamber 3 of the present embodiment, the automobile is transported on the automobile production line in a state where all the vehicle parts to be subjected to the EMS test and the EMI measurement are mounted. However, this automobile is not limited to a completed product (finished vehicle), but may be a vehicle under development (developed vehicle). Further, it goes without saying that not only automobiles but also those including vehicle parts under development (developed vehicle parts) can be regarded as specimens.

  The indoor unit 10 includes a turntable 12 installed on the transportation route of the automobile, and a plurality of antenna elements 14 disposed above the turntable 12. On the other hand, the measurement unit 20 is connected to the transmitter 22 connected to the input terminal of each antenna element 14, the receiver 24 connected to the output terminal of each antenna element 14, and the transmitter 22 and the receiver 24. A measuring device 26 having a communication control circuit 26a (see FIG. 2) and a drive control device 28 connected to the turntable 12 and the measuring device 26 are provided. Note that the measuring instrument 26 and the drive control device 28 may be configured by a single computer including various user interfaces and displays. Further, the transmitter 22 and the receiver 24 of the present embodiment are integrally configured as a transceiver 40.

  The turntable 12 is controlled by the drive control device 28 and is supported in the circumferential direction from the center of the support surface 12a on which the automobile transported on the production line is placed with the vertical direction to the support surface 12a as an axis. A drive motor unit 12c for rotating a support base 12b including 12a is provided. Further, the turntable 12 of the present embodiment includes a twin roller 12d that rotates in a direction opposite to the rotation of the wheel when the automobile is operated on the support surface 12a, and the power of the automobile (horsepower) simultaneously with the EMS test and the EMI measurement.・ Torque) can be measured. A detection sensor (not shown) for detecting the electric field strength of the electromagnetic wave radiated from the plurality of antenna elements 14 is provided at each position on the support surface 12a.

  The plurality of antenna elements 14 constitutes a radiating antenna device together with the transmitter 22 as a radiating element, and constitutes a radiating antenna device together with the receiver 24 as a radiating element, and is parallel to the support surface 12a by a support (not shown). And are arranged at equal intervals so that the distance between adjacent antenna elements 14 is constant.

  Further, the plurality of antenna elements 14 can have strong directivity in a specific direction by controlling each phase of the electromagnetic wave radiated from each antenna element 14 as a radiating antenna element by the communication control circuit 26a. A phased array antenna. In practice, the plurality of antenna elements 14 are configured such that the radiating element and the radiating element are separated from each other. However, for the convenience of explanation, the distinction of these classifications is omitted.

Next, the configuration of the transceiver 40 will be described with reference to FIG.
The transmitter 22 constituting the transmitter / receiver 40 is mainly configured by a plurality of signal generators that generate RF band high-frequency signals, and has an oscillation frequency according to the modulation signal M from the communication control circuit 26a as shown in FIG. A plurality of voltage controlled oscillators (hereinafter referred to as “SG”) 31 configured to change, and connected to each SG 31, the output level (amplitude) from SG 31 is converted into an amplitude control signal CA from communication control circuit 26 a. And a plurality of amplifiers 35 that are connected to the level adjusters 33 to amplify the output from the level adjusters 33, and are connected to the amplifiers 35, respectively. And a plurality of phase shifters 37 for adjusting the phase of the transmission signal supplied in accordance with the phase control signal CF from the communication control circuit 26a. The plurality of phase shifters 37 are respectively connected to the input terminals of the antenna elements 14 and can change the combined directivity of the entire radiating antenna device as described in the above formulas (1) to (3). it can.

  Further, in the transmitter 22, according to the selection signal S from the communication control circuit 26a, the selection circuit 30 for turning on / off each operation state of each SG31, and any one SG31 is selected to be on by the selection circuit 30. In this case, a plurality of first distributors 32 provided so that the output from the SG 31 can be distributed to all the level adjusters 33, and a transmission signal supplied via the amplifier 35, And a second distributor 36 that distributes to the communication control circuit 26a.

  On the other hand, the receiver 24 constituting the transmitter / receiver 40 includes an amplifying unit 41 that is connected to each antenna element 14 and individually amplifies the received signal from each antenna element 14. The signal is transmitted to the communication control circuit 26a.

  The communication control circuit 26a is connected to the transceiver 40, detects the amplitude, frequency, and phase of each received signal transmitted via the amplifier 41, and sends the detected information to the measuring device 26. introduce. The communication control circuit 26a is configured to output a modulation signal M, an amplitude control signal CA, a phase control signal CF, and a selection signal S to the transmitter 22 in accordance with a command from the microcomputer 26b described later.

  For example, according to the communication control circuit 26 a and the transmitter 22 configured as described above, the selection signal S is input to the selection circuit 30 so that the operation state of one SG 31 is turned on and the operation state of the other SG 31 is turned off. At the same time, the modulation signal M is input to the SG 31 in the on state so as to generate a high-frequency signal of a specific frequency, and the phase control signal CF is input to the phase shifter 37 so as to align the phases of the transmission signals. And a uniform electromagnetic wave can be irradiated to a car.

  Further, when the selection signal S is input to the selection circuit so as to turn on the operation state of some SGs 31, electromagnetic waves are irradiated only from the antenna element 14 corresponding to the SG 31 in the on state, so that power is injected. The antenna element 14 can be selected, and thereby the irradiation position of the electromagnetic wave can be changed (see FIG. 3A).

  Further, when the phase control signal CF is input to the phase shifter 37 so as to adjust the phase of the current supplied to each antenna element so as to join in an arbitrary phase in the same phase, strong directivity is given in that direction. It is possible to irradiate the electromagnetic wave, and the irradiation position of the electromagnetic wave can also be changed by this (see FIG. 3B).

  Further, a modulation signal M is input to each SG 31 so as to change the frequency of the high-frequency signal for each SG 31 or generate a random or periodic pulsed high-frequency signal or a continuous high-frequency signal. And since various different electromagnetic waves are radiated | emitted from each antenna element 14, a composite noise environment is reproducible (refer FIG.3 (c)).

  Note that the measuring device 26 outputs these various signals to the communication control circuit 26a, or inputs detection information regarding the received signal of each antenna element 14 from the communication control circuit 26a, and performs an EMS test and an EMI measurement. Are provided with a microcomputer (microcomputer) 26b that executes the various processes (EMS test process and EMI measurement process).

  Next, an EMS test process and an EMI measurement process executed by the microcomputer 26b of the measuring instrument 26 will be described. Note that the microcomputer 26b is a well-known microcomputer including a CPU, ROM, RAM, I / O, and a bus line, and is configured to be connected to an external storage device such as a hard disk or a flash memory. Specifically, the CPU executes an EMS test process and an EMI measurement process based on a program stored in the ROM or the external storage device. Both processes are started manually or automatically in accordance with an input operation by the examiner.

  Further, the external storage device includes control parameters for controlling the transmitter 22 via the communication control circuit 26a in the EMS test process, and a specimen (automobile in this embodiment) in the anechoic chamber 3. EMS simulation data (to be described later) in which electric field strengths at respective positions (hereinafter referred to as “target positions”) of the possible spaces are associated with each other are stored in advance.

  Further, the external storage device includes a detection parameter corresponding to detection information input from the receiver 24 via the communication control circuit 26a in the EMI measurement process, and a plurality of electronic devices (vehicle parts in the present embodiment) in the target space. EMI simulation data (to be described later) associated with each position (target position) is stored in advance.

<EMS test processing>
Among these, when the EMS test process is started, as shown in FIG. 4, first, in S110, the transmitter 22 is controlled via the communication control circuit 26a, whereby uniform electromagnetic waves or complex electromagnetic waves are generated. Irradiate or irradiate a specific position with electromagnetic waves, input detection values from detection sensors provided at each position on the support surface 12a, and calibrate the transmitter 22 based on the input detection values. .

  By the way, EMS simulation data is stored in advance in an external storage device for each operation mode for irradiating various electromagnetic waves as described above, and a space including a target position (hereinafter referred to as “target space”) by simulation using a computer. ) Is the calculated data of the electric field strength.

  For example, the condition shown in FIG. 5A is that the distance between the antenna elements 14 (pole distance) is 600 mm, the length of the antenna element 14 is 12000 mm, the installation height of the antenna element 14 is 2000 mm, and the area of the support surface 12a is 14000 mm in length. The width is 6000 mm.

  Further, under this condition, it is assumed that 20 MHz power is injected into all the antenna elements 14 (poles) as shown in FIG. At this time, as shown in FIG. 5C, the electric field strength when the region of the support surface 12 a is viewed from above shows a distribution depending on the frequency of the high-frequency signal transmitted through the antenna element 14. And as shown in FIG.5 (d), the electric field strength in the cross section of the horizontal direction of the area | region of the support surface 12a shows a substantially uniform distribution centering on the antenna element 14 of the center.

  As another example, as shown in FIG. 6 (b) under the above-described conditions (see FIG. 6 (a)), the case where 20 MHz power is injected only into the antenna element 14 (pole) at one end. Suppose. At this time, as shown in FIG. 6C, the electric field strength when the region of the support surface 12a is viewed from above shows a distribution shifted toward the antenna element 14 at one end where power is injected. As shown in FIG. 6D, the electric field strength in the cross section in the lateral direction of the region of the support surface 12a shows a strong distribution in the lower position of the antenna element 14 at the one end.

  As another example, under the above-described conditions, as shown in FIGS. 7A and 8A, 20 MHz power is injected into all antenna elements 14 (poles) with different phases. Is assumed. In addition, the phase difference of the high frequency signal which transmits the adjacent antenna element 14 is the same, and the case where the phase difference is 15 degrees, 30 degrees, 45 degrees, 60 degrees, 75 degrees, 90 degrees is assumed. At this time, the electric field strength in the cross section in the height direction from the support surface 12a (for example, the height is 1000 mm; see FIG. 7B) is one end as the phase difference increases as shown in FIG. 7C. The distribution is weakened while shifting in the direction of the antenna element (downward in the figure).

  At this time, the electric field strength in the lateral cross section (for example, the distance from the center to the cross section is 3000 mm; see FIG. 8B) of the region of the support surface 12a has a phase difference as shown in FIG. 8C. As it increases, the strong distribution appearing at the lower position of the antenna element 14 becomes weaker while shifting to one end side.

  Based on the distribution of the electric field strength, the amplitude, frequency, and phase of the high-frequency signal input to each antenna element 14 are used as control parameters, and the electromagnetic wave irradiation position by the plurality of antenna elements and the electric field at the irradiation position. EMS simulation data is obtained by previously calculating data indicating the strength.

  In contrast, in S110, the control parameters when the transmitter 22 is actually controlled via the communication control circuit 26a and the actual electric field strength obtained from the detection sensors provided at the respective positions on the support surface 12a are obtained. Based on the EMS simulation data, the operation of each unit (SG31, amplifier 35, phase shifter 37, etc.) of the transmitter 22 is adjusted so that an electromagnetic wave having a prescribed electric field strength is generated. Then, the control parameters including the adjustment values of the transmitter 22 at this time are overwritten and saved in the external storage device as EMS calibration data. Specifically, it is necessary to check the strength of the electromagnetic wave in the test standard and whether the assumed electromagnetic wave is irradiated to each position on the support surface 12a, and to reproduce the electromagnetic environment when it can be confirmed. Various control parameters are stored sequentially. Note that this step can be omitted from the next time onward.

  In subsequent S120, when the automobile transported on the production line is placed on the turntable 12, the twin roller 12d is driven via the drive control device 28, and various vehicle components ( The wheel is rotated by operating the engine etc., and the power of the car is measured.

  In subsequent S130, based on the EMS calibration data stored in S110, the modulation signal M, the amplitude control signal CA, the phase control signal CF, and the selection signal S are output to the transmitter 22 via the communication control circuit 26a. Thus, the electromagnetic wave from the antenna element 14 is irradiated to each part of the automobile in various operation modes. In various operation modes, for example, the frequency of the electromagnetic wave is changed by the modulation signal M, the intensity of the electromagnetic wave is changed by the amplitude control signal CA, and the irradiation position of the electromagnetic wave is changed by the phase control signal CF or the selection signal S. .

  In subsequent S140, it is determined whether there is any malfunction such as an output abnormality based on the output from the vehicle components (electronic devices) mounted on each part of the automobile, and the vehicle components corresponding to the electromagnetic waves irradiated in S130. Record the malfunction status. A measuring instrument 26 is connected to the output terminal of each electronic device, and the malfunction status of each part is confirmed according to a method predetermined for each vehicle component.

  In subsequent S150, it is determined whether or not the irradiation test of S130 and S140 has been performed a predetermined number of times from the start of the test. If it is determined that the irradiation test has been performed a predetermined number of times, the process proceeds to S180. If it is determined that the vehicle has not been operated, the process proceeds to S160. In S160, it is determined whether or not a malfunctioning position indicating the position of a vehicle component that has malfunctioned in the automobile has been identified. If a malfunction position is specified here, the process proceeds to S180, and if not specified, the process proceeds to S170.

In S170, the turntable 12 is rotated via the drive control device 28 to change the direction of the automobile, and the irradiation tests in S130 and S140 are performed again.
On the other hand, in S180, the malfunction state (irradiation test result) recorded in S140 is displayed on the display of the measuring instrument 26, and this process is terminated. If it is determined in S140 that there is a malfunction, the malfunction position specified in S160, the power injected into the antenna element 14 at the malfunction, the frequency of the high-frequency signal, and the operation mode (type of radiation noise) Display the measurement conditions.

<EMI measurement processing>
Next, when the EMI measurement process is started, as shown in FIG. 9, first, in S210, the EMI simulation data is calibrated based on the detection information obtained in the measurement tests of S230 and S240 described later.

  By the way, the EMI simulation data is stored in advance in the external storage device for each vehicle part as described above, and is a data in which detection parameters relating to electromagnetic waves radiated from the target position are calculated by simulation using a computer.

  For example, under the conditions described above (see FIG. 5A), as shown in FIGS. 10A and 11A, the center side is a predetermined distance (1000 mm) from the lateral end of the region of the support surface 12a. A case where a known vehicle part is placed at the target position is assumed as a target position. At this time, as shown in FIGS. 10 (b) and 11 (b), when noise is radiated from a known vehicle part, the electric field strength in the cross-section in the lateral direction including the vehicle part is radial from the target position. The distribution spreads out.

  Then, as shown in FIG. 10C, the amplitude (voltage) of the received signal (detection information) of each antenna element 14 at this time has a higher value as the antenna element 14 is closer to the target position. On the other hand, the voltage and the frequency have an inherent relationship depending on the target position and the type of noise. At this time, as shown in FIG. 11C, the phase shows a different value for each antenna element 14, and the phase and the frequency have a specific relationship depending on the target position and the type of noise.

  Based on such values and relationships, the amplitude (voltage), frequency, and phase of each received signal of each antenna element 14 are used as detection parameters, and data indicating the target position and the type of noise is calculated in advance. EMI simulation data.

  On the other hand, in S210, the received signal (detection information) of each antenna element 14 actually input via the communication control circuit 26a is used as a detection parameter, and the EMI simulation data is calibrated according to the target position specified in S260 described later. Then, the calibrated data (hereinafter referred to as “EMI calibration data”) is overwritten and saved in the external storage device.

  Note that the EMI calibration data is detected information corresponding to each antenna element 14 (pole) when a noise generation source described later is set for each of a plurality of target positions (see FIG. 12A). b)) and the data representing the relationship between the respective pieces of detection information (voltage, frequency, phase, etc.) (FIG. 12C) is stored in the external storage device. From the next time onward, this EMI calibration data becomes the object of calibration in S210.

In subsequent S220, as in S120 described above, measurement of vehicle power (measurement of operation) is continued, and the process proceeds to S230.
In S230, the electromagnetic wave radiated from the vehicle is measured based on the detection information input from the communication control circuit 26a. In the subsequent S240, the measured value of the electromagnetic wave is compared with a preset specified value, and a specified value is obtained. A measurement test is performed to determine whether or not there is an electromagnetic wave exceeding. The measured value of the electromagnetic wave is obtained by detection information analysis, for example, by calculating the total value of the amplitude (voltage) corresponding to each antenna element 14 from the detection information and extracting the maximum total value at each frequency. It is done.

  In S250, it is determined whether the measurement test of S230 and S240 has been performed a predetermined number of times from the start of the test. If it is determined that the measurement test has been performed a predetermined number of times, the process proceeds to SS280, If it is determined that it is not, the process proceeds to S260.

  In S260, when it is determined in S240 that there is an electromagnetic wave exceeding the specified value, the EMI calibration data (noise information is stored in the external storage device) based on the detection information (and thus the measured value of the electromagnetic wave) input in S230. By referring to (corresponding), it is determined whether or not the position of the noise generation source, which is a vehicle component (and thus an electronic device) that emits an electromagnetic wave exceeding a specified value, can be specified.

  That is, the amplitude (voltage), frequency, and phase of each received signal (detection information) of each antenna element 14 is used as a detection parameter, and data matching or similar to this is extracted from the EMI calibration data, so that the target position and noise are extracted. Try to identify the type of When the position of the noise generation source (noise generation position) is specified, the process proceeds to S280, and when it is not specified, the process proceeds to S270.

  In S270, the turntable 12 is rotated by 90 °, for example, via the drive control device 28, thereby changing the direction of the automobile and attempting to specify the noise generation position again. Here, as shown in FIG. 13A, before and after the turntable 12 is rotated, the antenna element 14 having the maximum amplitude (noise detection amount) is specified from the detected information. It can be assumed that there is a matrix of antenna elements 14 shown in FIG. 13 (b), and the noise occurrence position is specified by extracting the intersection where the noise detection amount shows the maximum value in the matrix.

  In S280, the presence / absence of the electromagnetic wave exceeding the specified value determined in S240 (presence / absence of noise generation source) is displayed on the display of the measuring instrument 26 as a result of the measurement test, and the process is terminated. If it is determined in S240 that a noise generation source exists, the detection information and the measured value when the noise is generated are displayed together with the noise generation position specified in S260. Further, when a vehicle part (electronic device) corresponding to the noise generation source is specified from the target position (noise generation position) and the type of noise, the electronic device is displayed together with the noise generation position.

[effect]
As described above, in the vehicle stripline 1 of the present embodiment, it is possible to radiate electromagnetic waves of different types (frequency, phase, amplitude) for each antenna element 14 in the EMS test. It is possible to irradiate the test sample (automobile) with mixed electromagnetic waves, and to reproduce various noise environments.

  Further, in the vehicle stripline 1, in the EMS test, it is possible to switch the operation state on / off for each antenna element 14 and to adjust the phase of the high-frequency signal transmitted through each antenna element 14. It is possible to irradiate an automobile with electromagnetic waves uniformly or to irradiate a specific part of the automobile.

  Further, in the vehicle stripline 1, in the EMI measurement, the turntable 12 is rotated, and a portion that emits strong electromagnetic waves in the automobile is formed by a matrix formed by the arrangement of the antenna elements 14 before and after the rotation. This makes it possible to identify the noise source without performing complicated control.

  Further, the vehicle stripline 1 can measure the power of the automobile while performing the EMS test or the EMI measurement, thereby shortening the working time on the production line.

[Correspondence with Invention]
In the present embodiment, the transmitter 22 corresponds to an example of a plurality of signal generators, the microcomputer 26b that performs EMS test processing corresponds to an EMS control unit, and the microcomputer 26b that performs EMI measurement processing corresponds to an example of EMI control unit. Note that, in the transmitter 22, one row of the components 31 to 37 corresponding to one antenna element 14 corresponds to one signal generation unit.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it is possible to implement in various aspects.

  For example, in the transmitter 22 of the above embodiment, when only one operation state is selected as the ON state among the plurality of SGs 31, the output from the SG 31 is distributed by the first distributor 32 corresponding to the SG 31. However, the present invention is not limited to this, and the communication control circuit 26a (and thus the microcomputer 26b) may be configured to control whether or not the output from the SG 31 is distributed by the first distributor 32.

  Further, the antenna elements 14 of the above embodiment are arranged horizontally and at equal intervals. However, the present invention is not limited to this. For example, as shown in FIG. 14A, the antenna elements 14 are arranged in a lattice shape (mesh shape). It may be arranged in a hemispherical shape. For example, when arranged in a mesh shape, it is possible to adjust the irradiation range of electromagnetic waves with high accuracy by configuring the conduction state of the intersection of each antenna element 14 so as to be switched on / off (FIG. 14 ( b) and (c)).

  In the above-described embodiment, the description has been made by picking up an automobile as a specimen. However, the present invention is not limited to this, and the specimen may include an electronic device, and more specifically, an electronic device. It may be itself.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle strip line, 3 ... Electromagnetic anechoic chamber, 5 ... Measurement room, 10 ... Indoor part, 12 ... Turntable, 12a ... Support surface, 12b ... Support stand, 12c ... Drive motor part, 12d ... Twin roller, 14 DESCRIPTION OF SYMBOLS ... Antenna element 20 ... Measuring part 22 ... Transmitter 24 ... Receiver 26 ... Measuring instrument 26a ... Communication control circuit 26b ... Microcomputer 28 ... Drive control device 30 ... Selection circuit 32 ... First distribution 33 ... Level adjuster, 35 ... Amplifier, 36 ... Second distributor, 37 ... Phase shifter, 40 ... Transceiver.

Claims (4)

An antenna having a plurality of antenna elements that emit electromagnetic waves when a high-frequency signal is input;
A plurality of signal generators connected to input terminals of the antenna elements, respectively, for generating the high-frequency signal;
By controlling the frequency, phase, modulation, and amplitude of the high-frequency signals generated by the plurality of signal generators, each antenna element emits an electromagnetic wave having a frequency, phase, modulation, and intensity set, and the antenna A measuring instrument having an EMS control means for performing a resistance test of the electronic device by an electromagnetic wave from the outside, based on an output from the electronic device mounted on a support stand separated from the
With
The plurality of antenna elements are arranged horizontally and at equal intervals,
Each of the plurality of signal generators includes a phase shifter that performs phase modulation of the high-frequency signal,
The EMS control means adjusts each phase of electromagnetic waves radiated from the plurality of antenna elements according to the intervals of the plurality of antenna elements via the phase shifters, by adjusting the combined directivity are calculated from each phase, you characterized electromagnetic wave testing apparatus that irradiates the electromagnetic wave in a specific position from said antenna. The plurality of signal generation units each have a distributor that distributes the high-frequency signal to the plurality of antenna elements,
2. The electromagnetic wave according to claim 1, wherein the EMS control unit causes a uniform electromagnetic wave to be emitted from the antenna by selectively operating one of the plurality of signal generation units. Test equipment. The support base is a turntable that has a support surface on which a test product in which a plurality of the electronic devices are mounted on each part is placed, and rotates in the circumferential direction around the center of the support surface.
The plurality of antenna elements are arranged in parallel to the support surface above the turntable, and each receive an electromagnetic wave radiated from the EUT.
The measuring device has EMI control means for measuring electromagnetic waves radiated from the specimen based on input signals from the antenna elements,
When it is determined that the measured value of the electromagnetic wave exceeds a specified value, the EMI control means changes the position of the EUT with respect to the antenna by driving and controlling the turntable, and before and after the change. 3. The electromagnetic wave test apparatus according to claim 1, wherein a position of an electronic device that emits an electromagnetic wave exceeding the specified value is specified based on an input signal from each of the antenna elements. When the position of a noise generation source that is an electronic device that radiates an electromagnetic wave exceeding the specified value is specified, the EMI control means is configured to detect the position of the noise generation source and the input signal from each antenna element. By storing the noise information associated with the measurement value of the electromagnetic wave, and when it is determined that the measurement value of the electromagnetic wave exceeds a specified value after the next time, by referring to the noise information based on the measurement value of the electromagnetic wave The electromagnetic wave test apparatus according to claim 3 , wherein a position of the noise generation source is specified.