JP2010117275A - Multi-antenna measuring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-antenna measuring system efficiently carrying out a characteristic measurement including both an active measurement and a passive measurement, about an antenna applied to a communication device loaded with a plurality of antennas. <P>SOLUTION: The active measurement is carried out, such that a signal sent from a measurement signal supply section 320 corresponding to a base station apparatus is transmitted from a measurement antenna 310, and received by the antenna to be measured 110 and inputted to a communication device to be tested 100 having a circuit configuration corresponding to a mobile communication terminal unit. Meanwhile, the passive measurement is carried out, such that the signal received by the antenna to be measured 110 is distributed by a distributor and inputted directly to a vector signal analyzer 120. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a multi-antenna measurement system that measures the characteristics of an antenna applied to a communication scheme that transmits information using a plurality of antennas, such as diversity and MIMO (Multi-Input Multi-Output) schemes.

Conventionally, a single antenna for communication mounted on a mobile communication terminal device represented by a mobile phone has been mainly used.
However, in recent years, communication techniques for transmitting information using a plurality of antennas, such as diversity or MIMO systems, have been introduced, and higher speed and higher quality of communication are becoming more advanced.
A mobile communication terminal apparatus to which such a technique is applied takes the form of a multi-antenna equipped with a plurality of antennas.

Since the performance of the multi-antenna greatly affects the transmission characteristics of the communication system, it is important to develop a multi-antenna that is applied to this type of communication transmission.
There is also a need for a measurement system that quantitatively evaluates the performance of a multi-antenna prototyped based on a design that meets various conditions.
More specifically, the process of developing an antenna is roughly divided into the following two phases.
The first phase is an antenna design / development phase, which is a so-called initial phase.
In the first phase, optimization of antenna performance in design is achieved using target antenna parameters (antenna gain, efficiency, correlation coefficient, etc.).

The second phase is an antenna performance confirmation phase, which is a so-called final phase.
In this second phase, the final confirmation of the performance of the antenna prototyped in the design and development phase of the antenna in the first phase will be performed. Conduct tests involving radio circuits and baseband signals.
In such a test, effective radiation power (TRP: Total Radiated Sensitivity) and effective reception sensitivity (TRS: Total Radiated Sensitivity) defined by 3GPP (3rd Generation Partnership Project) are measured for a single antenna.
Further, for multi-antennas, effective received power, correlation coefficient, transmission capacity, and the like are items to be measured.

The antenna measurement methods that are generally applied at present are roughly divided into the following two methods.
The first method is passive measurement. In this passive measurement, antenna gain and correlation coefficient are measured. The measurement is usually performed off-line.
Specifically, a network analyzer or a signal generator and a spectrum analyzer are connected to the antenna under measurement and the counter antenna, and the amplitude and phase of the signal when the signal transmitted / received from the counter antenna is transmitted / received by the antenna under measurement are measured.
The second method is active measurement. In this active measurement, radiated power and received power are measured.

Specifically, communication is established between the (simulated) base station apparatus and the mobile communication terminal apparatus, and the transmission performance of the mobile communication terminal apparatus is evaluated.
That is, the received power (RSCP: Received Signal Code Power), the received quality (SIR: Signai to Interference Retio), the error rate (BER: Bit Error Rate), etc., from the mobile communication terminal device to the base station device And the reception performance of the mobile communication terminal apparatus is evaluated by processing the information obtained by the base station apparatus.

On the other hand, various techniques have been proposed in the past for efficiently performing this measurement when measuring antenna performance.
For example, the antenna to be measured is attached to a rotation mechanism, and the measured value of the power gain directivity corresponding to the elevation angle of the antenna with respect to the azimuth angle of n points, which are a plurality of rotation angle positions of the rotation mechanism, and the incoming wave incident on the antenna There is a proposal to shorten the measurement time by calculating the effective gain from the angular density function corresponding to the elevation angle (see, for example, Patent Document 1).
There is also a proposal of a technique in which a mobile communication terminal device is fixed on a rotary table and various antenna characteristics such as a radiation pattern and their frequency characteristics are measured at high speed (for example, see Patent Document 2).
JP 2000-214201 A (summary, paragraphs 0013 to 0014, etc.) JP 2000-338155 A (Summary, paragraphs 0017 to 0018, etc.)

The conventional antenna characteristic measurement technique described above cannot simultaneously measure and evaluate antenna gain, correlation coefficient between antennas, radiated power, reception sensitivity, and transmission capacity.
That is, in the conventional measurement technique, it is necessary to perform the above-described passive measurement and active measurement separately.
This is because when performing a passive measurement of a mobile communication terminal device equipped with a plurality of antennas, it is common to use a network analyzer suitable for this measurement in order to measure the received power and phase. On the other hand, the main reason is that a network analyzer cannot be used for active measurement.

In active measurement, it is necessary to establish communication between a base station device and a mobile communication terminal device (for example, a simulation), and this situation is caused because a network analyzer is not used. Yes.
It should be noted that the measurement related to the existing mobile communication terminal device equipped with a single antenna essentially does not require the measurement of the correlation coefficient between the antennas, so the measurement data between the active measurement and the passive measurement is not really different. There was no situation where both measurements had to be performed. However, when multiple antennas are installed, it is necessary to perform both active and passive measurements. In this respect, the situation is fundamentally different from the case where a single antenna is installed. is there.

On the other hand, regarding the point of trying to improve the efficiency of measurement related to a mobile communication terminal device equipped with a plurality of antennas on the condition that both active measurement and passive measurement are included, reference is made to any of the above-mentioned patent documents. There is no.
The present invention has been made in view of such a situation, and relates to the antenna applied to a communication device equipped with a plurality of antennas, and efficiently performs measurement of characteristics including both active measurement and passive measurement. It is an object of the present invention to provide a multi-antenna measurement system that can be used.

In order to solve the above-described problems, the present application proposes the following techniques.
(1) A measured antenna holding unit having a movable holding mechanism for holding a plurality of measured antennas to be applied to a communication device under test while maintaining a selectively set mounting posture;
A holding mechanism control unit that controls the displacement of the holding mechanism over time;
A measurement signal supply unit for supplying a measurement signal to a measurement antenna corresponding to the antenna to be measured held by the holding mechanism;
A measurement signal supply control unit for controlling the operation of the measurement signal supply unit;
A received signal analyzer for analyzing an effective received power in the communication device under test when the radio wave radiated from the antenna for measurement is received by the antenna under measurement and a correlation coefficient between the antennas under measurement;
A transmission capacity characteristic measuring unit for measuring a transmission capacity characteristic of a signal transmission path including a radio transmission path from the measurement antenna to the antenna to be measured;
A measurement timing management unit that manages the operation under communication between the device under test, the measurement signal supply control unit, and the reception signal analysis unit;
A multi-antenna measurement system comprising:

In the multi-antenna measurement system of (1) above, a plurality of antennas to be measured that are applied to the communication device under test are maintained in a selectively mounted posture in the antenna holding unit to be measured and are moved to a movable holding mechanism. Retained.
The holding mechanism control unit controls the displacement of the movable holding mechanism over time.
On the other hand, the measurement signal supply unit supplies the measurement signal to the measurement antenna corresponding to the antenna under measurement held by the holding mechanism.

The measurement signal supply control unit controls the operation of the measurement signal supply unit.
The received signal analysis unit analyzes the effective received power in the communication device under test and the correlation coefficient between the antennas under measurement when the radio waves radiated from the antenna for measurement are received by the antenna under measurement.
Further, the transmission capacity characteristic measuring unit measures the transmission capacity characteristic of a signal transmission path including a radio transmission path from the measurement antenna to the antenna to be measured.
In the above, the measurement timing management unit manages so that operations among the communication device under test, the measurement signal supply control unit, and the reception signal analysis unit are synchronized.

(2) The multi-antenna measurement system according to (1), wherein the antenna under measurement holding unit is configured such that the holding mechanism gives a rotational displacement to the antenna under measurement.
In the multi-antenna measurement system of (2), particularly in the multi-antenna measurement system of (1), the measured antenna holding unit is configured such that the holding mechanism gives a rotational displacement to the measured antenna. It is possible to measure characteristics while changing the direction of the incoming radio wave to the measurement antenna.

(3) The multi-antenna measurement according to (1), wherein the holding mechanism control unit includes a holding mechanism control computer, and the holding mechanism control computer also functions as the measurement timing management unit. system.
In the multi-antenna measurement system of (3) above, particularly in the multi-antenna measurement system of (1), the holding mechanism control computer of the holding mechanism control unit serves as the measurement timing management unit as the communication device under test, the measurement signal. Management is performed so that operations between the supply control unit and the reception signal analysis unit are synchronized.

(4) The measurement signal supply unit is configured to supply a measurement signal corresponding to a signal transmitted from a base station in mobile communication to a mobile communication terminal device. Multi-antenna measurement system.
In the multi-antenna measurement system of (4) above, particularly in the multi-antenna measurement system of (1), a measurement signal corresponding to a signal emitted from a base station in mobile communication to a mobile communication terminal device is the measurement signal supply unit. Since the antenna is supplied from the measurement antenna and radiated from the measurement antenna, the characteristics of the antenna when the communication apparatus under test is in an actual use state can be verified.

(5) The multi-antenna measurement system according to (1), wherein the reception signal analysis unit includes a vector signal analyzer 121 and a vector signal analyzer control computer for controlling the vector signal analyzer 121. .
In the multi-antenna measurement system of (5) above, the received signal analysis unit is configured to include a vector signal analyzer and a vector signal analyzer control computer for controlling the vector signal analyzer, particularly in the multi-antenna measurement system of (1). Therefore, accurate measurement and analysis can be performed promptly.

(6) The transmission capacity characteristic measurement unit includes a measurement signal supply unit control computer constituting the measurement signal supply unit control unit, and a communication device control computer for controlling the communication device under test. (1) The multi-antenna measurement system according to (1).
In the multi-antenna measurement system of (6) above, particularly in the multi-antenna measurement system of (1), the measurement signal supply unit control computer constituting the measurement signal supply unit control unit and the communication device under test are controlled. The transmission capacity characteristic measuring unit is configured to include a computer for controlling the communication device under test, so that the transmission capacity characteristics of the signal transmission path including the wireless transmission path from the measurement antenna to the antenna to be measured can be obtained. Measurements can be made promptly and accurately.

(7) The measurement timing management unit is configured mainly by the holding mechanism control computer, and according to each predetermined displacement position of the holding mechanism, the communication device under test, the measurement signal supply control unit, and The multi-antenna according to (1), wherein execution of a linkage operation is performed so that each predetermined measurement related to the measured multi-antenna is performed so that operations between the received signal analysis units are synchronized Measuring system.

  In the multi-antenna measurement system of the above (7), in particular, in the multi-antenna measurement system of (1), each predetermined displacement position of the holding mechanism is determined by the measurement timing management unit configured mainly by the holding mechanism control computer. Accordingly, the predetermined measurements related to the multi-antenna to be measured are performed so that the operations of the communication device under test, the measurement signal supply control unit, and the reception signal analysis unit are synchronized. Since the execution of the linking operation is controlled, it is possible to measure the characteristics of the antenna under measurement at an appropriate timing while changing the direction of the incoming radio wave to the antenna under measurement.

  According to the present invention, a multi-antenna measurement system that can efficiently perform measurement of characteristics including both active measurement and passive measurement, with respect to the antenna applied to a communication device equipped with a plurality of antennas. Is realized.

Hereinafter, the present invention will be clarified by describing embodiments of the present invention in detail with reference to the drawings.
In each drawing referred to below, portions related to the main part of the present invention are exaggerated as appropriate, and other portions are appropriately simplified or omitted.
(Configuration example of multi-antenna measurement system)
FIG. 1 is a diagram showing a configuration of a multi-antenna measurement system as one embodiment of the present invention.

  In FIG. 1, a plurality (two in the illustrated example) of antennas 111 and 112 to be applied to the communication device under test 100 are maintained while maintaining the mounting postures selectively set by, for example, a measurer. A measured antenna holding unit 200 having a movable holding mechanism 210 is provided. Hereinafter, the multi-antenna including the plurality of antennas 111 and 112 to be measured is generally referred to as the antenna to be measured 110 as appropriate.

The communication device under test 100 is, for example, a mobile communication terminal device or an antenna measurement test circuit device having a circuit unit corresponding thereto. In this embodiment, the operation is controlled by the communication device under test control computer 101. Is done.
The holding mechanism 210 is configured, for example, as a mechanism having a turntable that is rotationally displaced by an electric motor, and is controlled to rotate while maintaining a predetermined rotation speed by a holding mechanism control computer 220 as a holding mechanism control unit. .

On the other hand, a measurement antenna 310 that is a multi-antenna including, for example, a plurality of antennas 311 and 312 corresponding to the antenna under measurement 110 held by the holding mechanism is provided.
In this case, the measurement antenna 310 is held by the measurement antenna holding unit 400 having the holding mechanism 410 similar to the holding mechanism 210 described above.
Further, a measurement signal supply unit 320 that supplies a measurement signal to the measurement antenna 310 is provided.

The measurement signal supply unit 320 is configured to supply, for example, a measurement signal corresponding to a signal emitted from a base station in mobile communication assumed in this measurement to the mobile communication terminal device. It can be configured as a signal generation circuit having a circuit portion similar to such a base station.
In this embodiment, the operation of the measurement signal supply unit 320 is controlled by a measurement signal supply control computer 330 that forms a measurement signal supply control unit.

When measuring the characteristics of the antenna under measurement 110, the antenna under measurement 110 and the antenna for measurement 310 are connected by the downlink radio transmission path.
On the other hand, a received signal from the antenna under measurement 110 is supplied to a received signal analysis unit 120 for analyzing the received signal, and is passed through the isolator 131 and 132 and the corresponding variable attenuators 141 and 142 in the subsequent stage. And supplied to the device under test 100.

The isolators 131 and 132 are inserted so as to be in the forward direction from the antenna under measurement 110 toward the communication device under test 100, and the signal levels are adjusted by the variable attenuators 141 and 142.
The reception signal analysis unit 120 is configured by applying, for example, a vector signal analyzer 121. In the illustrated example, the vector signal analyzer 121 is configured to be controlled by a vector signal analyzer control computer 122.

Since the reception signal analysis unit 120 includes the vector signal analyzer 121 and the vector signal analyzer control computer 122 that controls the vector signal analyzer 121, accurate measurement and analysis can be performed quickly.
The received signal analysis unit 120 may be configured by a vector signal analyzer with a built-in control computer.

In the above description, the antenna to be measured 110, the antenna holding unit to be measured 200 that holds the antenna to be measured, and the antenna for measurement 310 and the measurement antenna holding unit 400 that holds the antenna to be measured are installed in the predetermined anechoic chamber 20. 10 is also generated in the anechoic chamber 20.
On the other hand, a signal derived from an intermediate position between the above-described isolators 131 and 132 and the variable attenuators 141 and 142 in the subsequent stage of the antenna to be measured 110 is inserted through the variable attenuator 143 and the isolator 133 in this order, and the measurement signal supply unit 320. An uplink wired transmission path 30 that is transmitted toward the network is provided.

The isolator 133 is inserted in the transmission line 20 with a polarity in the forward direction from the test communication apparatus 100 to be measured toward the measurement signal supply unit 320.
It includes a test signal transmission side including a measurement signal supply unit 320 and a measurement signal supply control unit (measurement signal supply control computer 330), a communication device under test 100, and a communication device control computer 101 under test. As described above, the receiving side of the test signal has the downlink connected by the wireless transmission path 10 and the uplink connected by the wired transmission path 30.

  The test signal transmission side including the measurement signal supply unit 320 and the measurement signal supply control computer 330, the communication device under test 100, and the communication device control computer 101 under test are connected as described above. A transmission capacity measuring unit 40 that measures the transmission capacity characteristics of the signal transmission path including the wireless transmission path 10 to be measured is configured by the reception side of the test signal.

On the other hand, the holding mechanism control computer 220 is linked to the vector signal analyzer control computer 122, the communication device control computer 101, and the measurement signal supply control computer 330 by, for example, a LAN, as shown by broken lines. It is tied to possible.
By the above-described linkage, the operations among the communication device under test 100, the measurement signal supply control unit 330, and the reception signal analysis unit 120 are synchronized according to each predetermined displacement position of the holding mechanism 210. Thus, the execution of the linkage operation in which each predetermined measurement regarding the antenna under measurement 110 that is a multi-antenna is performed is controlled.

That is, the measurement timing management unit 50 in the multi-antenna measurement system is configured by the above-described linkage units mainly including the holding mechanism control computer 220.
The measurement timing management unit 50 is configured mainly by the holding mechanism control computer 220 as described above, and entrusts such a measurement timing management function to a server computer that functions as a supervisor that supervises the above-described computers. It is also possible to adopt a configuration.

(Operation of multi-antenna measurement system)
Next, the operation of the multi-antenna measurement system of FIG. 1 will be described.
First, a signal supplied from the measurement signal supply unit 320 functioning as a simulated base station apparatus is radiated from the measurement antenna 310, and the radiated signal is received by the measured antenna 110 of the communication apparatus under test 100. Establish communication.
As described above, the signal supplied from the measurement signal supply unit 320 is a measurement signal corresponding to a signal emitted from the base station in the mobile communication assumed in this measurement to the mobile communication terminal device.

Since a measurement signal corresponding to a signal emitted from a base station in mobile communication to a mobile communication terminal device is supplied from the measurement signal supply unit 320 and radiated from the measurement antenna 310, the communication device under test 100 is actually connected. The characteristics of the antenna 110 when in use can be verified.
The establishment of the communication as described above is performed by linking the measurement signal supply control computer 330 and the communication device under test control computer 101.

In this case, the timing of linkage is adjusted by the holding mechanism control computer 220 functioning as the measurement timing management unit 50.
The measurement signal transmitted through the downlink wireless communication path 10 after the establishment of the above-described communication is input to the communication device under test 100 through the isolators 131 and 132 and the variable attenuators 141 and 142.

Further, as described above, the uplink wired transmission path 30 is provided from the communication device under test 100 to the measured signal supply unit 320, and the measurement signal supply control computer 330 and the communication device under test are controlled. Linkage with the computer 101 is performed.
The above-described downlink and uplink are separated by the isolators 131 and 132, and interference of both is suppressed, and the uplink signal level is adjusted by the variable attenuators 141 and 142 as described above.

With the communication established as described above, transmission of predetermined test data is started from the measurement signal supply control computer 330 side to the communication apparatus control computer 101 side.
When FDD (Frequency Division Duplex) is adopted as a communication method, it is not necessary to separate transmission and reception, so the following explanation is based on TDD (Time Division Duplex). This is the case.

After the communication is established, rotation of the holding mechanism 210 in the antenna holding unit 200 to be measured is started under the control of the holding mechanism control computer 220 serving as the holding mechanism control unit.
In accordance with the rotation of the holding mechanism 210, and hence the rotation of the antenna under measurement 110 (111 and 112), the measured received power, the correlation coefficient between the antennas, and the transmission capacity characteristics are measured at each predetermined rotation position.

In this measurement, under the control of the holding mechanism control computer 220 that also functions as the measurement timing management unit 50, the vector signal analyzer control computer 122, the communication device control computer 101, and the measurement signal supply control Appropriate synchronization between predetermined operations in the computer 330 is achieved.
In this embodiment, the transmission capacity characteristic is measured as follows.

Under the control of the measurement signal supply control computer 330 constituting the transmission capacity measurement unit, data having a large capacity (a certain file whose content is represented by this data) is transferred to the measurement signal supply unit (for example, simulated From the base station) through the wireless transmission path 10 and the antenna under measurement 110 to the communication device under test 100.
In order to download a large amount of data, the download is continuously performed over a certain period of time.

The transmission capacity is measured in the communication device under test control computer 101 within the period during which the download continues.
In addition to the above-described method, transmission capacity is measured by installing communication capacity measurement application software (for example, iperf) on both the measurement signal supply control computer 330 and the communication device control computer 101. In addition, the transmission capacity may be measured using a function by such application software.

The measured value of the transmission capacity described above depends only on the performance of the antenna under measurement 110. Therefore, it is possible to evaluate the performance of the antenna under measurement 110 from the measured value of the transmission capacity.
The signal received by the antenna under measurement 110 is input to the communication device under test 100, and is also input to the vector signal analyzer 120 that is distributed by a distributor (not shown) and forms a received signal analyzer.

This configuration will be considered from the viewpoint of either the active measurement or the passive measurement described above.
For example, a signal emitted from a device (measurement signal supply unit 320) equivalent to an actual wireless device corresponding to a base station device is transmitted from the measurement antenna 310 and received by the measured antenna 110, and the communication device under test The part input to 100 corresponds to the configuration for active measurement.

On the other hand, the part received by the antenna under measurement 110 is branched by a distributor and directly input to the vector signal analyzer 120 corresponds to a configuration for passive measurement.
Therefore, in the multi-antenna measurement system of FIG. 1, the part corresponding to the active measurement and the part corresponding to the passive measurement are mixed, and both measurements can be performed simultaneously.

Therefore, there is no need to reconfigure the measurement connection during active measurement and passive measurement, and the time and effort required to construct and reconstruct the measurement system can be saved, reducing the measurement time and improving measurement accuracy. it can.
Since the illustrated isolators 131 and 132 are provided in the form as described above, a signal emitted from the communication device under test 100, which can be a simulated mobile communication terminal device, is also input to the vector signal analyzer 120. It is deterred.

The vector signal analyzer 120 acquires the effective received power received by the antenna under measurement 110 and the correlation coefficient between the antennas (between the antennas 111 and 112 under measurement) in real time.
As a result, the effective received power, the correlation coefficient between the antennas, and the transmission capacity of the antenna under measurement 110 (111 and 112) and the transmission capacity are measured and acquired, and the performance of the antenna under measurement 110 is measured based on these measured values. Is accurately evaluated.

As described above, the holding mechanism control computer 220 includes the vector signal analyzer control computer 122, the communication device control computer 101, and the measurement signal supply control as conceptually illustrated by the broken lines. It is connected to the computer 330 so that it can be linked.
Further, through such linkage, each measurement value is collected by the holding mechanism control computer 220 and used for performance evaluation of the antenna 110 to be measured.

(Example of measurement results and performance evaluation of antenna under measurement)
2 to 5 are diagrams illustrating measurement results in the multi-antenna measurement system described with reference to FIG.
2 shows the transmission capacity with respect to the rotation angle of the holding mechanism 210, FIG. 3 shows the received power with respect to the rotation angle of the holding mechanism 210, and FIG. FIG. 5 shows the effective received power of the other antenna under measurement 112 with respect to the rotation angle of the holding mechanism 210. FIG.

Consider the phenomenon that appears as shown in FIGS. When attention is paid to the throughput of the antenna from the data relating to the transmission capacity characteristics, it is observed that the antenna is depressed at a rotation angle of about 90 degrees.
In order to pursue this factor, when the effective received power (RSCP..., FIGS. 4 and 5) and the correlation coefficient (correlation... FIG. 2) of each of the antennas 111 and 112 to be measured are confirmed, the effective received power depends on the rotation angle. Whereas it is substantially constant, the correlation coefficient is high in the vicinity of the rotation angle of 90 degrees.
From the above results, it is found that an increase in the correlation coefficient can be cited as a factor of deterioration of transmission characteristics.

  The present invention relates to an antenna applied to a communication apparatus equipped with a plurality of antennas, and realizes a multi-antenna measurement system capable of efficiently performing characteristic measurement including both active measurement and passive measurement. Can be used.

It is a figure showing the structure of the multi-antenna measurement system as one embodiment of this invention. It is a figure showing an example of the measurement result regarding the transmission capacity by the multi-antenna measurement system of FIG. It is a figure showing the other example of the measurement result regarding the correlation coefficient by the multi-antenna measurement system of FIG. It is a figure showing an example of the measurement result of the reception power by the multi-antenna measurement system of FIG. It is a figure showing the other example of the measurement result of the reception power by the multi-antenna measurement system of FIG.

Explanation of symbols

10 ... Wireless transmission path (downlink)
20 ... Anechoic chamber 30 ... Wired transmission path (uplink)
40 ... Transmission capacity measuring unit 50 ... Measurement timing management unit 100 ... Communication device under test 101 ... Computer 110 for controlling communication device under test ... Antenna under measurement (multi-antenna)
111 ... Antenna under measurement 112 ... Antenna under measurement 120 ... Received signal analyzer 121 ... Vector signal analyzer 122 ... Vector signal analyzer control computer 131 ... Isolator 132 ... Isolator 133 ... Isolator 141 ... Variable attenuator 142 ... Variable attenuator 143 ... Variable attenuator 200: Antenna to be measured holding unit 210 ... Holding mechanism 310 ... Measurement antenna (multi-antenna)
311 ... Measurement antenna 312 ... Measurement antenna 320 ... Measurement signal supply unit 330 ... Measurement signal supply control unit (measurement signal supply control computer)
400: Measurement antenna holding unit 410 ... Holding mechanism

Claims (7)

A measured antenna holding unit having a movable holding mechanism for holding a plurality of measured antennas to be applied to the communication device under test while maintaining a selectively set mounting posture;
A holding mechanism control unit that controls the displacement of the holding mechanism over time;
A measurement signal supply unit for supplying a measurement signal to a measurement antenna corresponding to the antenna to be measured held by the holding mechanism;
A measurement signal supply control unit for controlling the operation of the measurement signal supply unit;
A received signal analyzer for analyzing an effective received power in the communication device under test when the radio wave radiated from the antenna for measurement is received by the antenna under measurement and a correlation coefficient between the antennas under measurement;
A transmission capacity characteristic measuring unit for measuring a transmission capacity characteristic of a signal transmission path including a radio transmission path from the measurement antenna to the antenna to be measured;
A measurement timing management unit that manages the operation of the communication device under test, the measurement signal supply control unit, and the reception signal analysis unit in synchronization;
A multi-antenna measurement system comprising:   The multi-antenna measurement system according to claim 1, wherein the antenna-under-measurement holding unit is configured such that the holding mechanism gives a rotational displacement to the antenna under measurement.   The multi-antenna measurement system according to claim 1, wherein the holding mechanism control unit includes a holding mechanism control computer, and the holding mechanism control computer also functions as the measurement timing management unit. .   The multi-measurement signal supply unit according to claim 1, wherein the measurement signal supply unit is configured to supply a measurement signal corresponding to a signal transmitted from a base station in mobile communication to a mobile communication terminal device. Antenna measurement system.   The multi-antenna measurement system according to claim 1, wherein the reception signal analysis unit includes a vector signal analyzer and a vector signal analyzer control computer that controls the vector signal analyzer.   The transmission capacity characteristic measurement unit includes a measurement signal supply unit control computer that constitutes the measurement signal supply unit control unit, and a communication device control computer that controls the communication device under test. The multi-antenna measurement system according to claim 1, wherein:   The measurement timing management unit is configured mainly by the holding mechanism control computer, and according to each predetermined displacement position of the holding mechanism, the communication device under test, the measurement signal supply control unit, and the reception 2. The multi-antenna measurement according to claim 1, wherein execution of a linked operation is performed so that each predetermined measurement related to the multi-antenna to be measured is performed so that operations between the signal analysis units are synchronized. system.

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