JP2001296322A - Jammer measurement system and jammer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a jammer measurement system capable of accurately measuring jammer regardless of a measurement environment. A The antenna 21 connected to the jammer meter 22, a predetermined distance L ₁ defined by the standard, is not affected by the jamming waves which it is radiated from a distance a and the electrical apparatus 1 than the distance disposed at two points of L _2. Then, in this state, the power of the electric device 1 is turned on.
At 1 and 21, the electric field strength of the radio wave received is measured, and the measurement result is input to the arithmetic unit 4 and compared to calculate the electric field strength of the jamming radio wave radiated from the electric device 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jammer measuring system and jammer measuring apparatus, and more particularly to a technique for measuring the electric field strength of electromagnetic waves radiated from electric equipment outdoors.

[0002]

2. Description of the Related Art Various types of electrical equipment such as OA equipment, household electrical equipment, and industrial electrical equipment (hereinafter simply referred to as electrical equipment).
In, because the strength of electromagnetic waves radiated from electric equipment (hereinafter referred to as interference) affects the operation of other electric equipment, certain standards (standard ) Is set, and the manufacturer of the electrical equipment measures the electric field strength of the interfering radio wave prior to the manufacture and sale of the electrical equipment, and tests whether or not the above-mentioned standard is satisfied.

[0003] The electric field strength of this jamming radio wave is sometimes measured by disposing an electric device as an object to be measured in an anechoic chamber that blocks static electricity and external radio waves (hereinafter referred to as external noise). In such a case, the construction cost of the anechoic chamber is extremely high. Therefore, the anechoic chamber is usually operated as follows in an environment with little external noise.

[0004] First, as a preparation stage for measurement, as shown in FIG. 3, a jammer b is located at a position separated by a predetermined distance (measurement distance for jammer) L from an electric device a as an object to be measured. The connected antenna c is installed. The distance L between the electric equipment a and the antenna c is set based on a standard defined in this type of jamming wave measurement (specifically, for example, in a standard such as CISPR, this distance L is usually 3 m, 10 m, 30 m, etc.). The antenna c can be located from a source d of external noise (for example, a radio transmitting station such as a radio or television broadcasting station, or a factory where an electrical device that generates jamming radio waves is installed). The position is selected as far as possible (a position at which the distance Lx is several kilometers or more).

When the arrangement of the electric equipment a and the antenna c is completed as described above, the electric field strength of the jamming radio wave is measured in accordance with the procedure shown in the flowchart of FIG.

That is, first, with the power of the electrical equipment a turned off (see step S1 in FIG. 4), the jammer b is operated, and the electric field strength of the radio wave received by the antenna c at this time is measured (FIG. 4). The measurement result is recorded as first data (see step S2 in FIG. 4). The first data indicates the electric field intensity in a state where the electric device a is turned off, that is, in a state where no interference wave is radiated from the electric device a which is the object to be measured. Is required.

Next, the power supply of the electric equipment a is turned on (see step S4 in FIG. 4), and in this state, the interference wave measuring device b is operated again to measure the electric field strength of the electric wave received by the antenna c (see FIG. 4). 4 Step S5), the measurement result at that time is the second
(See step S6 in FIG. 4).
Since the second data is a measurement result during power-on of the electric equipment a, the electric equipment a
5 shows the electric field strength in a state including the jamming radio wave radiated from.

[0008] The data of the electric field strength obtained in this manner is input to an arithmetic unit (computer) not shown. The arithmetic unit removes a component corresponding to external noise from the second data by comparing the two input data, and selects a jamming wave radiated by the electric device a,
The electric field strength of the jamming wave was calculated (step S7 in FIG. 4).
reference).

[0009]

However, the conventional methods of measuring jamming radio waves as shown in FIGS. 3 and 4 have the following problems, and improvements have been desired.

That is, in the conventional method, as shown in FIG. 4, the measurement of the external noise (see step S2 in FIG. 4) and the measurement of the interference wave including the external noise (see step S5 in FIG. 4) are separately performed. Therefore, when the electric field strength of the external noise fluctuates, it is difficult to accurately grasp the electric field strength of the interfering radio wave radiated from the electric device. In other words, in the conventional method, all external noise that suddenly occurs during the measurement of jamming radio waves is treated as jamming radio waves radiated from electrical equipment, so that the electric field strength of the jamming radio waves can be accurately measured. Did not.

Moreover, in the conventional measuring method, in order to avoid such a problem, it is necessary to select an environment in which fluctuation of external noise is small, and it is difficult to secure a place.

Further, in the above-mentioned conventional method, since it is necessary to measure external noises individually and individually, the measurement time is about twice as long as that in the case of using the above-described anechoic chamber, and much time is required for the measurement. There was a problem.

On the other hand, in the above-mentioned conventional measuring method, when measuring the electric field intensity in step S5 in FIG. 4, it is necessary to surely capture the jamming radio waves radiated from the electric equipment. For this purpose, a conventional measuring instrument is provided with a speaker (not shown) for reproducing a received radio wave, and a measurer selects a jamming radio wave and an external noise based on the sound output through the speaker. But
Sorting relying on such sounds requires skill, and there is a problem in that handling and securing human resources are difficult.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a jammer measuring system capable of accurately measuring jamming regardless of the measurement environment. The main object of the present invention is to provide a jammer which can be easily handled.

[0015]

According to the present invention, there is provided a jamming wave measuring system for measuring an electric field intensity of a jamming wave radiated from an object to be measured. First electric field intensity measuring means disposed at a predetermined distance from the target object for measuring the interference electric wave, second electric field intensity measuring means disposed farther from the distance for measuring the interference electric wave, and the first and second electric field intensity measuring means. Computing means for comparing the measurement results obtained by the electric field strength measuring means, selecting the electric field strength of the jamming radio wave radiated from the object to be measured, and calculating the electric field strength.

In a preferred embodiment of the present invention, the distance between the object to be measured and the second electric field intensity measuring means is radiated from the object to be measured by the second electric field intensity measuring means. It is characterized in that the distance is set so as not to be affected by jamming radio waves as much as possible.

That is, according to the present invention, when the power of the object to be measured is turned on, the first electric field strength measuring means is provided with an electromagnetic wave in which the external noise is superimposed on the interference wave radiated by the object to be measured. Received. On the other hand, only the external noise (or an electromagnetic wave in which an extremely weak interfering radio wave is superimposed on the external noise) is received by the second electric field intensity measuring means disposed farther from the first electric field strength measuring means. You.
The calculating means compares the electric field strengths measured by the first and second electric field strength measuring means, thereby obtaining only the jamming radio signal obtained by removing the external noise component from the measurement result of the first electric field strength measuring means. The electric field strength is obtained by calculation.

As described above, according to the present invention, the first electric field strength measuring means for mainly receiving the jamming radio wave and the second electric field strength measuring means for mainly receiving the external noise operate simultaneously, and based on the measurement results. Since the interference wave radiated from the object to be measured is calculated, the time required for the measurement of the interference wave can be reduced, and sudden external noise generated during the measurement can be treated as external noise. Can be accurately measured.

Further, the jammer measuring apparatus according to the present invention comprises:
In a jammer measuring apparatus for measuring the electric field strength of jamming waves radiated from an electric device, a connector portion is provided which can be attached to and detached from a computer which executes a control process of the jammer measuring device. Various operation commands including a setting of a reception frequency can be received from the computer via the computer, and a measurement result can be output to the computer as digital data.

As a preferred embodiment thereof, the interference wave measuring device includes means for identifying a modulation type of a received electromagnetic wave, and storage means for recording the identification result,
The apparatus is characterized in that an interference radio wave can be specified based on the modulation type stored in the storage means.

That is, the jamming wave measuring device of the present invention comprises:
Since a connector unit is provided which can be attached to and detached from a computer that executes control processing of the jammer measurement apparatus, the control program for the jammer measurement apparatus is stored in a general-purpose computer (so-called personal computer) that is commercially available. By connecting the connector unit to the connector unit, it is possible to measure jamming radio waves using a commercially available general-purpose computer.

In addition, the interference wave measuring apparatus includes means for identifying the type of modulation of the received electromagnetic wave and storage means for recording the identification result. In the vicinity of the target electronic device, it is possible to receive in advance the interfering radio wave emitted from the electronic device and record its modulation type, so that the interfering radio wave can be easily and quickly selected when measuring the electric field strength of the interfering radio wave. Becomes possible.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a jammer measuring system according to the present invention will be described in detail with reference to FIGS.

Embodiment 1 FIG. 1 shows a schematic configuration of a jamming wave measuring system according to the present invention. This jamming wave measurement system is a system for measuring the electric field strength of jamming waves radiated from an electric device 1 which is an object to be measured, and includes a pair of electric field strength measuring means 2a and 2b and an arithmetic means 4
And the main part.

The electric field strength measuring means 2a and 2b each comprise an antenna 21 and a jammer measuring device 22 connected to the antenna 21 via a cable 23. Field strength measurement is enabled.

More specifically, the antenna 21 is in the form of a broadband antenna capable of receiving radio waves in a certain frequency band (for example, radio waves in the tens of megahertz to thousands of megahertz band) necessary for measuring jamming radio waves. You. Also, this antenna 2
The antenna 1 has a directional antenna, and its height and direction can be adjusted.

On the other hand, the jammer 22 is an electric field strength meter which can arbitrarily set a frequency to be measured within the above-mentioned fixed frequency band. In the present embodiment, the jammer 22 is used. Is configured to be controllable by the calculation means 4. Specifically, the jammer 22
Is provided with a connector unit (not shown) that enables attachment and detachment to and from a computer that constitutes the arithmetic unit 4, and can be controlled based on an operation command output from the computer via the connector unit. It is said. Therefore, various operations such as changing the setting of the reception frequency and requesting the output of the measurement result can be performed on the jammer signal measuring device 22 by operating the computer.

The arithmetic means 4 is composed of a computer which controls the operation of the jammer 22 and executes the processing described later based on a predetermined control program. Specifically, a general-purpose microcomputer provided with an expansion slot (not shown) in which the jammer 22 can be mounted is preferably used as the arithmetic means 4, and the jammer is provided in the expansion slot. By mounting the measuring instrument 22, the operation control of the above-described jamming radio measuring instrument 22 is enabled. The calculating means 4 includes a wired or wireless data communication means (not shown), and is provided to an external device (specifically, the other electric field strength measuring means 2) via the data communication means. Data communication is possible with the jammer 22).

A description will now be given of the measurement of the electric field strength of the jamming radio wave by the jamming wave measuring system configured as described above.

First, as a preparation stage for the measurement, as shown in FIG. 1, the antenna 21 constituting one of the pair of electric field strength measuring means 2a and 2b,
The above-mentioned standards (for example, CISPR)
Predetermined distance defined by the standard), such as (is disposed across the jammer measured distance) L ₁ position. Note that the jamming measured distance L ₁ is the distance defined by the standard, usually the distance L ₁ is 3m, is set to one of a distance of 10m or 30 m.

On the other hand, the other electric field intensity measuring means 2b
It is disposed far from the jamming measured distance L _1.
Distance Specifically, the distance L ₂ which antenna 21 of the other of the field strength measurement means 2b is disposed is not subjected as much as possible the influence of the interference radio wave radiated from the object to be measured, i.e., electric field intensity A position where the electric field strength of the jamming radio wave radiated from the electric device 1 received by the measuring means 2b is negligibly small compared to the electric field strength of the jamming radio wave received by the one electric field strength measuring means 2a. It is arranged in. Specifically, the distance L ₂ is set to about several tens of m.

Each of these antennas 21 and 21 is a source of external noise (for example, a radio transmitting station such as a radio or television broadcasting station, or an electrical device that radiates jamming radio waves such as equipment in a factory). Etc.) as far as possible from 5. This is to prevent the antenna 21 from receiving the external noise radiated from the external noise source 5 as much as possible at the time of measuring the electric field strength of the jamming radio signal to be described later, and the antenna 21 and the external noise source 5 Distance L ₃
Is preferably several kilometers.

By setting the distance from the external noise source 5 to about several kilometers in this way, the distance L ₃ between each of the antennas 21 and 21 and the external noise source 5 is determined.
L ₃ can substantially equated, so that each antenna 21,
The electric field strength of the external noise received at 21 can theoretically be regarded as the same.

Next, FIG. 2 shows a procedure for measuring the electric field strength of the jamming radio wave radiated from the electric device 1, and the procedure for the measurement will be described below.

(1) First, the electric device 1 is placed on the measuring table 6, and in this state, the electric device 1 is turned on (FIG. 2).
Step S1). Thereby, the electric device 1 starts a predetermined operation, and the electric device 1 emits a jamming radio wave.

(2) Next, in this state, the electric field intensity measuring means 2a and 2b are operated to measure the electric field intensity of the radio waves received by the antennas 21 and 21 (see step S2 in FIG. 2). In this electric field strength measurement, a procedure for specifying in advance the frequency, the radiation direction, and the like of the interfering radio wave radiated from the electric device 1 is performed, and the antenna is set so that the electric field strength of the received interfering radio wave is maximized. The height position, direction, etc. of 21 are adjusted.

At this time, the electric field intensity measuring means 2a receives both the interfering radio wave radiated from the electric device 1 and the external noise, and measures the electric field intensity in a state where these are superimposed. On the other hand, the electric field intensity measuring means 2b
As described above, since it is arranged at a distance as described above, the interfering radio wave radiated from the electric device 1 is not received, and since it is negligibly weak even if it is received,
Only extraneous noise will be received. That is, the electric field intensity measuring unit 2b measures the electric field intensity of the external noise.

(3) In this manner, the electric field strength measuring means 2
When the electric field strength is measured in both a and 2b, the measurement result is transmitted to the calculating means 4. In this embodiment, since the jammer 22 is mounted on the calculating means 4, the calculating means 4 is provided in both of the electric field strength measuring means 2a and 2b. Is collected in one of the arithmetic means 4 via the data communication means (not shown).

Then, in the arithmetic means 4 in which the data is collected, a process of comparing the measurement result of the electric field intensity measuring means 2a with the measurement result of the electric field intensity measuring means 2b is performed.
By comparing the measurement results, the electric field strength of only the jamming radio wave excluding the external noise is calculated.

As described above, according to the jamming wave measuring system of this embodiment, the pair of electric field strength measuring means 2a and 2b allows the external noise with the jamming wave superimposed and the external noise without the jamming wave superimposed. Are measured at the same time,
The work time required for the measurement of jamming radio waves can be reduced. Moreover, these measurements are performed by a pair of electric field strength measuring means 2.
a and 2b are performed simultaneously in parallel, so that even if the intensity of the external noise fluctuates during the measurement, the fluctuation can be accurately grasped, and the arithmetic means 4 can accurately select the jamming radio wave. Become. In addition, since the jamming radiometer 22 is incorporated into the calculating means 4, the jamming radio waves radiated from the calculating means 4 and the jamming radiometer 22 are received as extraneous noise. It is possible to accurately measure the jamming radio waves from the electric device 1.

In the above-mentioned standard, since various conditions are set for the antenna 21 and the connecting cable 23 used for the measurement of the jamming radio wave, the jamming wave measuring system according to the present invention is used. In the case where the electric field strength measurement is performed, it is necessary to select the antenna 21 and the like according to the conditions defined in these standards in principle, but the jamming radio wave measurement system according to the present invention is applied in an environment that does not satisfy such conditions. It is also possible. However, in that case,
It is preferable to previously confirm the correlation with the measurement result under an environment that satisfies the above conditions, and by doing so, for example, it is possible to perform measurement on various electric devices 1 using the same antenna 21. other made possible, it is possible to perform a measurement with shorter than a defined distance to the jamming measured distance L ₁ in the standard.

Embodiment 2: Next, a second embodiment of the present invention will be described. The second embodiment relates to an improvement of the electric field intensity measuring means 2a, and more specifically, an interference radio wave measuring device 22 and a calculating means 4 (hereinafter, these are referred to as the (Referred to as a jammer 7).

That is, in the second embodiment, a means for identifying the modulation type of the received radio wave and a storage means for storing the identification result (both not shown) are mounted on the jammer measuring apparatus 7. Is done.

Specifically, these means include a DSP
(Digital Sound Processor) is adopted, whereby the type of modulation (for example, CW, AM, SSB, FM, etc.) of the radio wave received by the antenna 21 can be identified and recorded.

In the jammer 7 equipped with the DSP, the following procedure is performed prior to the jammer measurement of the electric device 1 described above.

That is, with the power of the electric device 1 turned on, the jammer measuring device 7 equipped with the DSP is arranged near the electric device 1 and the modulation type of the jammer radiated from the electric device 1 is set. Identify and record this. As a result, it is possible to analyze and record the sound component of the jamming radio wave radiated from the electric device 1 in a mode such as a harmonic or a low frequency, and the external noise and the jamming radio wave can be easily measured when the electric field strength of the jamming radio wave is measured. Can be sorted out.

The above-described embodiment is merely a preferred embodiment of the present invention, and the present invention is not limited to this, and various design changes can be made within the scope of the present invention.

For example, in the above-described embodiment, the configuration has been described in which the jammer measuring device 22 is mounted in an expansion slot of a microcomputer constituting the arithmetic means 4, but the jammer measuring device 22 is built in the microcomputer. Or an external form via a connection cable or the like.

In the above embodiment, both the electric field strength measuring means 2a and 2b are provided with the jammer measuring device 22 and the calculating means 4. However, the calculating means 4 is provided with at least one of the electric fields. What is necessary is just to provide in the intensity measuring means 2a (or 2b). In that case, the jamming radio wave measuring device 22 without the calculating means 4 is provided with the arithmetic means 4 provided in the other electric field strength measuring means 2a (or 2b). Communication means for performing data communication with the device is provided.

Further, in the above embodiment, the method of measuring the electric field strength of the interference wave radiated from the electric equipment 1 using the pair of interference wave measurement means 2a and 2b has been described. It is also possible to provide a plurality of interference wave measuring means (reference numeral 2b in the above embodiment). In this case, the contents of the processing by the calculating means 4 (specifically, the processing shown in step S3 in FIG. 2) are also performed by the electric field strength measuring means 2b.
It is needless to say that the design may be changed as appropriate according to the number.

[0051]

As described above in detail, according to the jamming wave measuring system of the present invention, the first and second electric field strength measuring means can measure the radio wave including the jamming wave radiated from the object to be measured. The electric field strength and the electric field strength of the extraneous noise not including the above-mentioned interfering radio waves are measured at the same time, and the electric field strength of the interfering radio waves is calculated by comparing these.Therefore, it is necessary to measure the back noise prior to the measurement of the interfering radio waves. As a result, not only the time required for the measurement of jamming radio waves can be greatly reduced, but also the measurement of jamming radio waves can be performed stably and accurately without being affected by the change in the intensity of external noise. for that reason,
According to the present invention, it is possible to measure jamming radio waves even in an environment where the electric field strength of external noise fluctuates.

According to the apparatus for measuring jamming radio waves according to the present invention, the jamming wave measuring apparatus for measuring the electric field strength of the jamming waves radiated from the electric equipment is connected to the computer for executing the control processing of the apparatus. It has a connector unit that enables detachment, and is capable of receiving various operation commands including the setting of the reception frequency from the computer via the connector unit, and outputting the measurement result to the computer as digital data. This makes it possible to measure the electric field strength of the jamming radio wave using a general-purpose microcomputer.

Further, by providing the interference wave measuring device with means for identifying the modulation type of the received radio wave and storage means for recording the result of the identification, the device can be used to detect the modulation type in advance. By recording the modulation type of the radiated interference wave, it becomes possible to easily and quickly measure the interference wave.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a jamming wave measuring system according to the present invention.

FIG. 2 is a flowchart showing an outline of a procedure for measuring jamming radio waves in the jamming wave measurement system.

FIG. 3 is an explanatory diagram for describing a conventional jamming wave measuring method.

FIG. 4 is a flowchart showing an outline of a measurement procedure of the conventional jamming wave measurement.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric equipment (measured object) 2a, 2b Electric field strength measuring means 21 Antenna 22 Interference radio wave measuring device 5 External noise source 7 Interference radio wave measuring device

Claims (4)

[Claims] 1. A system for measuring the electric field intensity of an interference wave radiated from an object to be measured, comprising: a first electric field intensity measurement disposed at a predetermined interference wave measurement distance from the object to be measured. Means, a second electric field strength measuring means disposed farther than the interference wave measuring distance,
And a computing means for comparing the measurement results obtained by the second electric field strength measuring means to select a disturbing radio wave radiated from the object to be measured and calculating the electric field strength thereof. Radio measurement system. 2. The distance between the object to be measured and the second electric field strength measuring means is not affected as much as possible by the interfering radio waves radiated from the object to be measured in the second electric field strength measuring means. The jammer detection system according to claim 1, wherein the system is set at a distance interval. 3. An interference wave measuring apparatus for measuring the electric field intensity of an interference wave radiated from an electric device, wherein a connector unit is provided which can be attached to and detached from a computer which executes control processing of the interference wave measurement apparatus. And a computer configured to receive various operation commands including a setting of a reception frequency from the computer via the connector unit and to output a measurement result to the computer. 4. A radio communication apparatus comprising: means for identifying a modulation type of a received radio wave; and storage means for recording a result of the identification, wherein interference radio waves are selected based on the modulation type stored in the storage means. The apparatus for measuring jamming radio waves according to claim 3, wherein