JPH0666863A - Electromagnetic environment measuring device - Google Patents

Abstract

PURPOSE:To three-dimensionally measure the electromagnetic environment in an optional space position around a radiated interference source by providing a floating body provided with an antenna, a receiving part and a detecting position for antenna position, a ground surface moving body provided with a measuring part, and a cable for connecting the floating body to the moving body. CONSTITUTION:A floating body 13 is loaded on an automobile 1, a control signal is transmitted from the automobile 1 to drive floating body propulsive propellers 14, 14' provided on the floating body 13, and the floating body 13 is made to float in the air and moved in the space in the horizontal and vertical directions within the length range of a cable 17. The position measuring radio wave from a GPS satellite is received by the three-dimensional position detecting antenna of the floating body 13, and detected by the receiving part of the automobile 1 through the cable 17. Simultaneously, the interference wave signal detected by the electromagnetic environment measuring antenna 12 of the floating body 13 is also taken into the receiving part of the automobile 1 through the cable 17. The data processing is performed making the interference wave signal correspond to the space position signal, and the processed data are stored in a memory part. The automobile 1 is moved, the same operation is repeated, and a coverage contour in an optical space can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used for measuring electromagnetic interference waves. In particular, the present invention relates to a technique for measuring an electromagnetic environment around a disturbance radiation source in a three-dimensional space.

[0002]

2. Description of the Related Art In recent years, various types of electromagnetic interference waves such as amateur radio waves and CB radio waves have been a cause of malfunction such as malfunction and destruction of electronic devices. The decrease in resistance to electromagnetic interference waves of electronic devices accompanying the increase in speed and power consumption of semiconductor elements has spurred this kind of problem. An electromagnetic interference wave that causes a failure of an electronic device is generated by various mechanisms, and its temporal distribution and an intrusion route into the inside of the electronic device are uncertain, and reproducibility is often poor. Under such circumstances, attempts have been made to measure the electromagnetic environment using a mobile measurement system.

A conventional example will be described with reference to FIG. Figure 1
1 is a block diagram of a conventional example device. In FIG. 11, the automobile 1 is used as the surface moving body. An electromagnetic environment measuring antenna 12 is provided on the roof of the automobile 1 and is connected to a measurement signal receiving / measuring unit 25 including an electric field intensity meter and a spectrum analyzer. The position signal detection unit 5 uses the information from the geomagnetic sensor 3 that detects the azimuth of the automobile 1 and the distance pulse transmission unit 4 that generates the traveling distance measuring pulse corresponding to the rotation of the traveling distance of the wheel.
Detect the position of. The position information of the position signal detection unit 5 and the measurement information of the measurement signal reception measurement unit 25 are matched by the measurement position signal matching unit 27, and an image is displayed on the drawing unit 28.

The measurement result by the conventional apparatus will be described with reference to FIG. FIG. 12 is a diagram showing a measurement result by the conventional device. The results of estimating the distribution of constant constant electric field (or constant magnetic field) lines based on the measured data of the electric field (or magnetic field) intensity at any road position while driving on the road around the radiated disturbance source are shown. .

Surrounding the radio transmitting antenna 8 are a road 9 and an area 10 with an urban area and an area 11 without a road composed of fields, forests, meadows and the like. When installing information communication equipment in these areas 10 and 11, it is necessary to know the range of influence of the radiated interference wave from the wireless transmission antenna 8, and the electromagnetic environment measurement using the measuring device as shown in FIG. Is done.

The electric field strengths E _A , E _B , E _C at the points A, B, C located at the distances r _A , r _B , r _C from the radio transmitting antenna 8 are measured while the automobile 1 travels on the road 9. To do. If points on the road where there are known buildings such as maps whose distances from the wireless transmission antenna 8 are previously set as reference points, the positions of these points A, B, and C are geomagnetic sensors mounted on the automobile 1. 3 and the distance r _A , r _B , which is obtained from the traveling distance by the number of pulses transmitted from the distance pulse transmitter 4,
r _C also becomes clear.

On the other hand, since it is known that the electric field strength E around the radio transmitting antenna 8 is inversely proportional to the distance r from the radio transmitting antenna 8, the radio transmitting antenna 8 and the points A, B and C in the area 10 are known. In the radial directions a, b, and c that connect the radio transmission antennas 8 having the same electric field strength E ₁ E _1.
The distances r _A1 , r _B1 and r _C1 from the measured electric field strengths E _A , E _B and E _C and the distances r _A , r _B and r _C are: E ₁ = E _A · r _A / r _A1 = E _B · r _B / r _B1 = E _C · r
_{It can be} obtained from the relationship of _C / r _C1 . On the other hand, the radial distance r _{D1 that} is the electric field strength E ₁ in the area 11 where there is no road is often good if the transmission output W is clear from the radio wave propagation formula in the free space of radio waves, for example, in the case of a medium-wave broadcasting antenna. A known value of E ₁ ≈K√W / r _D1 (where K is a proportional constant) is obtained as a constant value in the area 11. As a result, the isoelectric field line having an electric field strength of E ₁ around the wireless transmission antenna 8 which is a radiation interference source is obtained as shown in FIG. 2, and the isoelectric field line having an electric field strength E ₂ different from E ₁ is also the same. Is calculated as a broken line.

[0008]

However, these isoelectric field lines obtained by the conventional device are based on the estimated value based on the actual measurement data on the road in the area around the radiated disturbance source where the road exists. A large error occurs because the reflection status of radio waves differs depending on the height and density of buildings near the measurement point. In addition, since it is not possible to measure areas without roads around radiated disturbance sources, it is based on an estimate using a simple radio wave free space propagation formula. Is significantly different from the value of.

Further, since the antenna used in the automobile is also used for the measurement, the height and the direction are limited, and three-dimensional precise isoelectric field lines including the vicinity of the radiation interference source including the height direction are obtained. Is difficult.

The present invention has been made against such a background, and an object of the present invention is to provide an electromagnetic environment measuring apparatus capable of three-dimensionally measuring an electromagnetic environment at an arbitrary spatial position around a radiation interference source.

[0011]

SUMMARY OF THE INVENTION The present invention comprises an antenna,
The electromagnetic environment measuring device includes a receiving unit that receives an electromagnetic wave that reaches the antenna, a detecting unit that detects the position of the antenna, and a measuring unit that obtains a measurement value related to the electromagnetic environment from an output signal of the receiving unit.

Here, a feature of the present invention is to provide a levitation body on which the antenna, the receiving unit, and the antenna position detecting means are mounted, and a surface moving body on which the measuring unit is mounted, and the levitation. A cable for connecting the body and the surface moving body is provided, and the cable includes a transmission path for transmitting an output signal of the receiving section and an output signal of the antenna position detecting means.

Further, a levitation propulsion means is mounted on the levitation body, a remote control means for controlling the levitation propulsion means is mounted on the surface moving body, and an output control signal of the remote control means is transmitted to the cable. It is desirable to include a transmission line that does. It is desirable that these transmission lines including this transmission line are optical fiber cables.

The position detecting means preferably includes means for receiving radio waves from a position measuring artificial satellite. Further, it is preferable that the position detecting means is a means for detecting a three-dimensional position, and the measuring section includes a means for displaying the measured value and the three-dimensional position in association with each other.

[0015]

[Function] An electromagnetic environment measurement antenna is mounted on a floating body that can be moved in the air, and measurement in a three-dimensional space is possible.

The electromagnetic environment measurement data and position data of the levitation body, and three types of signals of the control signal of the levitation body are transmitted and received between the measuring means and the control means on the ground by the signal transmission line connecting the levitation body and the ground device. To be done. It is desirable to use an optical fiber cable for the signal line from the viewpoint of improving the reliability of the signal and reducing the weight. Further, by multiplexing these three types of signals and transmitting them by one signal transmission path, it is possible to further reduce the weight.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of a first embodiment device of the present invention. FIG. 2 is a block diagram of the first embodiment device of the present invention.

The present invention is directed to an electromagnetic environment measuring antenna 12
And a receiving unit 2 for receiving electromagnetic waves coming to the electromagnetic environment measuring antenna 12, and the electromagnetic environment measuring antenna 1.
Two-dimensional position signal detection unit 21 which is a position detection unit
And a measurement signal receiving / measuring unit 25 that obtains a measurement value related to the electromagnetic environment from the output signal of the receiving unit 2.

Here, the feature of the present invention is that the levitation body 13 on which the electromagnetic environment measuring antenna 12, the receiving unit 2 and the three-dimensional position signal detecting unit 21 are mounted is provided, and the measuring signal receiving and measuring unit 25 is mounted. Car that is a ground surface moving body
And a cable 17 for connecting the levitation body 13 and the automobile 1. The cable 17 is an optical transmission line for transmitting the output signal of the receiving unit 2 and the output signal of the three-dimensional position signal detecting unit 21. Fiber cables 17 ₁ and 17
_It is in the place including ₂ .

Further, the levitation propeller 1 is attached to the levitation body 13.
4 and 14 'are mounted on this floating propeller 1
The levitation body control signal transmission unit 30 which is a remote control means for controlling the cables 4 and 14 'is mounted on the automobile 1 and the cable 17
The configuration includes an optical fiber cable 17 ₃ which is a transmission path for transmitting the output control signal of the remote control means.

The three-dimensional position signal detecting section 21 is configured to include a GPS device for positioning the position by radio waves from a GPS (Global Positioning System) satellite which is an artificial satellite for position measurement. Further, the output signal of the three-dimensional position signal detection unit 21 is a three-dimensional position detection signal, and the measurement signal reception measurement unit 25 is a means for displaying the measured value and the three-dimensional position in association with each other. The configuration includes a signal matching unit 27 and an image drawing unit 28.

Next, the operation of the first embodiment of the present invention will be described. The levitation body 13 is mounted on the automobile 1 and stopped at an arbitrary position on the road. The levitation propulsion propellers 14 and 1 provided in the levitation body 13 by sending a control signal from the levitation body control signal transmission unit 30 provided in the automobile 1 shown in FIG.
4'is driven to levitate the levitation body 13 in the air, and moves in arbitrary horizontal and vertical spaces within a range determined by the cable length with the stop position of the automobile 1 as the center. GPS satellites 20 that are constantly transmitted during this movement
The positioning radio wave from the 3D position detection antenna 2 which is a GPS antenna is received by the 3D position signal detection unit 2
The spatial position of the levitation body 13 is detected by the three-dimensional position signal receiving unit 29 from 1 through the optical fiber cable 17 ₂ . The sweep activation unit 26 is operated by this detection output signal to take in the interfering wave detection signal detected by the electromagnetic environment measurement antenna 12 coming to the measurement signal reception measurement unit 25, and
The detection output signal from the three-dimensional position signal receiving unit 29 is input to the measurement position signal matching unit 27, where the interfering wave measurement signal and the spatial position signal are subjected to data processing, and the data is stored in a storage unit (not shown). Remember. If necessary at this stage, the image processing unit 28 displays the processed data such as isoelectric field lines on the screen. The processed data can be displayed as a three-dimensional view based on the three-dimensional position signal in addition to the plan view described in the conventional example. The drive energy of the selective distribution circuit unit 22, the drive circuit units 23 and 23 ′, and the three-dimensional position signal detection unit 21 in the levitation body 13 is the levitation body 1 not shown.
It uses 3 batteries.

After the above operation is completed, the levitation body 13 is collected in the automobile 1, then moved to another road position and the same operation is repeated to obtain isoelectric field lines in an arbitrary space without a road. Since these isoelectric field lines are not estimated curves based on the data on the road according to the conventional example technology, but are based on the actual measurement data at each position, the topography, building height, density, etc. Even in such a situation, it represents an accurate actual environment condition.

Next, the float 13 will be described with reference to FIG. FIG. 3 is a view showing the floating body 13. The levitation propellers 14 and 14 'composed of two sets of rotary vanes obtain stable buoyancy by offsetting the torque by rotating the vanes of each set in the same direction and the vanes of different sets in opposite directions. ing. Also, the levitation propeller 14
The horizontal progression is changed by changing the rotation speed of 14 'and 14'. At the center of the levitation body 13, an aerial block portion 15 in which an electric circuit mounted on the levitation body 13 is stored is provided. The flying device which is the basis of the levitation body 13 is generally commercially available as an electric radio control model.

A three-dimensional position detecting antenna 19 and an electromagnetic environment measuring antenna 12 are attached to the levitation body 13. The three-dimensional position detecting antenna 19 is a GPS satellite 2
Positioning radio waves from 0 are received. The electromagnetic environment measurement antenna 12 is a wide range of three-axis orthogonal dipole antenna, and has a configuration capable of handling incoming radio waves from various directions without rotating. The levitation propulsion propellers 14 and 14 'are suspended apart from the main body of the levitation body 13 at a distance d so as to reduce the influence of radiated interference waves from a motor that is a drive source.

Next, the cable feeding portion 70 will be described with reference to FIG. FIG. 4 is a diagram showing the cable feeding portion 70. The cable 17 is wound around a cable drum 34, and a feeding guide 35 that moves axially outside the cable drum 34 is provided. The cable feeding portion 70 is controlled by the levitation body control signal sending portion 30 of the automobile 1, and the cable drum 34 is always perpendicular to the external force of the cable 17 applied when the cable 17 is fed out in the propulsion drive control of the levitation body 13. The rotation of the rotary disc control motor 38 is controlled to control the rotation of the rotary disc 37 so that the cable 17 has a predetermined reaction force and the cable drum rotation motor 36 prevents the cable 17 from slackening more than necessary. Control. When the levitation body 13 is collected in the automobile 1 after the measurement is completed, the feeding guide 35 is moved in the axial direction of the cable drum 34 so that the cable 17 can be wound evenly.

By using such a cable feeding portion 70, the feeding and winding of the cable 17 during the levitation propulsion control of the levitation body 13 is facilitated.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram of the apparatus of the second embodiment of the present invention. In the device of the second embodiment of the present invention, the length l of the cable 17 is
When the length becomes longer, the cable 17 hangs down due to its weight and prevents the floating body 13 from being restricted from moving in the air due to contact with an obstacle or the like in the vicinity.

An auxiliary balloon 31 for suspending the cable is provided for each of the predetermined lengths l i and l j of the cable 17. If a helium gas having a volume and atmospheric pressure that cancels the cable weight of the predetermined cable lengths li and lj is sealed in the auxiliary balloon 31 in advance, the distance from the stop position of the automobile 1 to the levitation body 13 increases, and Even if there is an obstacle such as a building or a tree, the hanging portion of the cable 17 can be lifted, so that the obstacle can be avoided and the electromagnetic environment in a wider space can be measured.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a block diagram of the apparatus of the third embodiment of the present invention. A feature of the third embodiment device of the present invention is that the auxiliary balloon 31 of the second embodiment device of the present invention is provided with an auxiliary balloon propeller 32. The control signal branching unit 33 branches and selects the control signal of the propeller 32 for propelling the auxiliary balloon 31 from the signals transmitted by the cable 17, and the propeller 32 for propelling is selected.
To control.

The propeller 32 for propulsion provided on the auxiliary balloon 31 facilitates avoiding contact of the cable with an obstacle. Further, it is possible to measure the electromagnetic environment at an arbitrary spatial position even in an area where buildings of different heights and directions are densely packed.

Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a block diagram of the fourth embodiment device of the present invention. The device of the fourth embodiment of the present invention is characterized in that the electromagnetic environment measurement is constituted by a semiconductor laser light source 39, an optical modulator 40 and an optical feed type antenna 12 '.

Since the optically fed antenna 12 'is lightweight and has wide band characteristics, the weight of the floating body 13 to be mounted can be reduced, and the electromagnetic environment can be measured over a wide area without replacing the antenna. The reference light generated by the semiconductor laser light source 39 reaches the photoelectric conversion branch circuit 18 ₁ via the optical fiber cable 17 ₁ , and the optical modulator 40 drives the optical power feeding type antenna 1
It is modulated corresponding to the input from 2 '. The modulated light reaches the electro-optical conversion branch circuit 24 ₁ via the photoelectric conversion branch circuit 18 ₁ ′ and the optical fiber cable 17 ₁ again, and is input to the measurement signal reception / measurement unit 25.

Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a block diagram of the fifth embodiment device of the present invention. The present invention features the fifth embodiment device of the three-core optical fiber cable 17 _{1-17 3} independent of the first embodiment of the present invention device shown in FIG. 2, the position detection signal transmission of the optical fiber cable 17 ₂ and the optical fiber cable 17 ₃ for transmitting the floating body propulsion control signal are shared by one optical fiber cable 17 ₄ .

The optical fiber cable 17 ₄ is connected to the electro-optic conversion branch circuit 24 ₄ of the automobile 1, and a photoelectric conversion branching circuit 18 ₄ of the float 13. In the device of the fifth embodiment of the present invention,
A position detection signal and the float control signal transmitted by using the same optical fiber cable 17 _4, the electro-optic conversion branch circuit 24 ₄ of the automobile 1, and branches respectively in the photoelectric conversion branching circuit 18 ₄ of the float 13 To use. For this reason, the number of optical fiber cores to be used is reduced, the weight of the cable connected to the levitation body 13 can be reduced, and the interfering wave detection signal is transmitted independently by another optical cable 17 _1. There is an advantage that the characteristics are not reduced due to interference or the like.

Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a block diagram of a sixth embodiment device of the present invention. A feature of the sixth embodiment device of the present invention is that the optical fiber cable 17 ₁ for the interfering wave detection signal which is independent in the fifth embodiment device of the present invention is also integrated into one optical fiber cable 17 ₅ .

[0037] The electro-optic conversion branch circuit 24 ₅ of the motor vehicle 1, is connected by an optical fiber cable 17 ₅ of one and the photoelectric conversion branching circuit 18 ₅ of the float 13, the position detection signal, the float control signal, electromagnetic environment measurement The three signals of the signals are branched and output.

Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 10 is a block diagram of the seventh embodiment device of the present invention. The seventh embodiment of the present invention is characterized in that the levitation body 13
That is, the auxiliary balloon 31 containing the helium gas was used. For the weights of the electromagnetic environment measuring antenna 12 and the aerial block portion 15, the levitation propellers 14 and 1
In addition to the buoyancy of 4 ', the buoyancy is obtained by adjusting the pressure and volume of the helium gas sealed in the balloon 31.

The levitation propulsion propellers 14 and 14 'are
By applying pulses having different pulse widths and periods to these drive motors to control the rotation speed and direction, the air can be moved in any direction.

In the first embodiment of the present invention, the sweep starter 26 is operated by the detection output signal from the three-dimensional position signal receiver 29, and this output is used to capture the incoming interfering wave signal to the measurement signal reception / measurement unit 25. As described above, in the measurement signal reception / measurement unit 25, the incoming signal from the electromagnetic environment measurement antenna 12 is stored and updated in the memory for each self-sweep, and when the three-dimensional position detection output signal is input, The output may be sent to the measurement position signal matching unit 27.

[0041]

As described above, according to the present invention, it is possible to three-dimensionally measure the electromagnetic environment at any spatial position around the radiation interference source. Further, it is possible to measure even in a place where it is difficult to enter such as an automobile.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram of an apparatus according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a levitation body according to a first embodiment of the present invention.

FIG. 4 is a view showing a cable feeding portion.

FIG. 5 is a configuration diagram of a second embodiment device of the present invention.

FIG. 6 is a configuration diagram of a third embodiment device of the present invention.

FIG. 7 is a block diagram of an apparatus according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram of a fifth embodiment device of the present invention.

FIG. 9 is a block diagram of an apparatus according to a sixth embodiment of the present invention.

FIG. 10 is a configuration diagram of a seventh embodiment device of the present invention.

FIG. 11 is a configuration diagram of a conventional device.

FIG. 12 is a diagram showing a measurement result by a conventional device.

[Explanation of symbols]

1 Car 2 Receiver 3 Geomagnetic Sensor 4 Distance Pulse Transmitter 5 Position Signal Detector 8 Radio Transmitter Antenna 9 Road 10, 11 Area 12 Electromagnetic Environment Measurement Antenna 12 'Optically Fed Antenna 13 Levitator 14, 14' For Levitation Propulsion Propeller 15 Aerial block 17 Cable 17 ₁ , 17 ₂ , 17 ₃ , 17 ₄ , 17 ₅ Optical fiber cable 18 ₁ , 18 ₁ ′, 18 ₂ , 18 ₃ Photoelectric conversion branch circuit 19 Three-dimensional position detection antenna 20 GPS satellite 21 three-dimensional position signal detection unit 22 selective distribution circuit unit 23, 23 'drive circuit unit 24 ₁ , 24 ₂ , 24 ₃ electro-optical conversion branch circuit 25 measurement signal reception measurement unit 26 sweep activation unit 27 measurement position signal matching unit 28 drawing unit 29 three-dimensional position signal receiving unit 30 levitating body control signal transmitting unit 31 auxiliary balloon 32 auxiliary balloon propeller 33 control signal Bifurcation 34 cable drum 35 feeding guide 36 cable drum rotating motor 37 rotates the disk 38 rotating disk control motor 39 semiconductor laser light source 40 optical modulator 70 cable feeding unit

Claims (5)

[Claims] 1. An antenna, a receiving unit for receiving an electromagnetic wave arriving at the antenna, a detecting unit for detecting the position of the antenna, and a measuring unit for obtaining a measurement value related to an electromagnetic environment from an output signal of the receiving unit. In the electromagnetic environment measuring apparatus, a levitation body on which the antenna, the receiving unit, and the antenna position detecting unit are mounted is provided, and the surface moving body on which the measuring unit is mounted, the levitation body, and the surface moving body. An electromagnetic environment measuring apparatus, comprising: a cable to be connected, the cable including a transmission path for transmitting an output signal of the receiving section and an output signal of the antenna position detecting means. 2. A levitation propulsion means is mounted on the levitation body, remote control means for controlling the levitation propulsion means is mounted on the surface moving body, and an output control signal of the remote control means is transmitted to the cable. The electromagnetic environment measuring device according to claim 1, further comprising a transmission line that operates. 3. The electromagnetic environment measuring apparatus according to claim 1, wherein the transmission line is an optical fiber cable. 4. The electromagnetic environment measuring apparatus according to claim 1, wherein the position detecting means includes means for receiving radio waves from a position measuring artificial satellite. 5. The electromagnetic wave according to claim 1, wherein the position detecting unit is a unit for detecting a three-dimensional position, and the measuring unit includes a unit for displaying the measured value and the three-dimensional position in association with each other. Environmental measurement device.