JPH063395A - Electromagnetic environment measuring device - Google Patents

Abstract

(57) [Abstract] [Purpose] To enable three-dimensional measurement of the electromagnetic environment at an arbitrary spatial position around a radiated emission source such as a wireless transmission antenna. [Arrangement] The levitation body 13 equipped with an electromagnetic environment measurement antenna 12 is arbitrarily moved in the air around the radiated disturbance source, and the electromagnetic environment measurement signal detected by the antenna 12 and the levitation body 13 from the ground vehicle 20 are transferred. The levitation body control signal is transmitted by the optical fiber cable 17. Then, the spatial position of the levitation body is three-dimensionally detected by the measurement block section 16a using the position measuring cable 18 attached to the levitation body 13 on the ground side, and the measurement data signal is correspondingly matched on the ground side. Display the drawing. This makes it possible to measure and display the electromagnetic environment in the space without roads in association with the three-dimensional position. Moreover, since each transmission signal is exchanged using an optical fiber that does not affect the electromagnetic environment,
It enables stable and highly accurate measurement and control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile measuring system for three-dimensionally measuring an electromagnetic environment around a radiated emission source by using a moving body equipped with a measuring antenna. It is about.

[0002]

2. Description of the Related Art FIG. 12 is a block diagram of a conventional measuring system using an automobile as a moving body. 1 is an electromagnetic environment measuring antenna mounted on a roof of the automobile, 2 is an electric field intensity meter or a spectrum analyzer. The measuring unit 3, a geomagnetic sensor for detecting the azimuth at the position of the moving vehicle, 4 a distance pulse sending unit for generating a pulse for measuring the traveling distance in response to the rotation of the wheels of the moving vehicle, 5 a geomagnetic sensor 3, A position signal detection unit that detects the position / direction information of the moving vehicle from the distance pulse transmission unit 4, and 6 is a measurement / position signal matching unit that matches the measurement data of the measurement unit 2 with the position data from the position signal detection unit 5. , 7 are drawing units for drawing the data matched by the measurement / position signal matching unit 6 and displaying the images.

[0003] FIG. 11 is a diagram illustrating a method of traveling on a road around a radiated emission source using the measurement system of FIG. 12, and based on measurement data of an electric field (or magnetic field) intensity on an arbitrary road, a constant equal electric field (or 8 is a plan explanatory view of a method of estimating the distribution of (isomagnetic field) lines, where 8 is a wireless transmission antenna used for radio, TV, FM broadcasting, communication, etc., 9 is a wireless transmission antenna
Is a road in the vicinity of which mobile vehicles can pass, 10 occupies one side area of the wireless transmission antenna 8, an area with the road 9 such as a residential / commercial area, 11 is the other area of the wireless transmission antenna 8, It is an area without roads consisting of fields, forests, and pastures. When installing information communication equipment in these areas, 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 measurement system of FIG. 12 is performed as follows. It is being appreciated.

That is, the traveling vehicle of FIG. 12 travels on the road 9 of FIG. 11, and the distance r _A from the radio transmitting antenna 8 is
r _B, respectively A located r _C, B, the electric field intensity E _A of the point C, E _B, measures the E _C. If a point on the road where the distance to the wireless transmission antenna 8 is known from a map or the like is set as a reference point in advance, these A to
The position of the point C is obtained from the traveling distance based on the number of pulses output from the geomagnetic sensor 3 and the distance pulse transmitter 4 mounted on the moving vehicle, and r _A to r _C are also clarified.

On the other hand, since it is known that the electric field strength E around the wireless transmission antenna 8 is inversely proportional to the distance r from the antenna, the wireless transmission antenna 8 and each of A, B, and
On the radial directions 8-a, 8-b, 8-c connecting to the point C, the radio transmission antenna 8 having the same electric field strength E ₁
The distances r _A1 , r _B1 , r _C1 from the measured electric field strength E
_{By A} , E _B , E _C and r _A , r _B , r _C , E ₁ = E _A · r _A
/ R _A1 = E _B · r _B / r _B1 = E _C · r _C / r _C1

On the other hand, the electric field strength E in the roadless area 11
If the transmission output w (vector amount) of the road (radius) r _D1 to be 1 is clear from the radio wave propagation formula in the free space of radio waves, for example, E1≈K · w which is well known in the case of a medium wave broadcasting antenna. ^{From 1/2} / r _D1 (where K is a proportional constant), it is determined as a constant value in the area 11. From these, the isoelectric field lines where the electric field strength is E ₁ around the radiated emission source 8 are shown in FIG.
A solid line E ₁ is obtained as a curve, and an isoelectric field line having an electric field strength E ₂ different from E ₁ is also obtained as a dotted line E ₂ .

[0007]

However, these equipotential lines obtained by the conventional measuring system shown in FIG.
Areas with roads around the radiated emission sources are based on estimated values based on actual measurement data on the roads, and because the reflection status of radio waves differs depending on the height and density of buildings near the measurement points, it is large. There is a drawback that an error occurs.
In addition, since it is not possible to measure the area without roads around the radiated emission source, it is based on the estimated value using the mere free space propagation formula of the radio wave. There is a big difference from the value.
In addition, since the measurement uses the antenna mounted on the mobile vehicle, there is a limit to the measurement in the height direction, and it is possible to obtain a three-dimensional precise isoelectric field line including the height around the radiated emission source. There are difficult drawbacks.

In view of the above points, the present invention has been made to solve the above problems, and an object thereof is to three-dimensionally determine the electromagnetic environment at an arbitrary spatial position around a radiation interference wave source such as a radio transmission antenna. The purpose of the present invention is to provide a cable positioning type wired control electromagnetic environment measuring device capable of performing a dynamic measurement.

[0009]

In order to achieve the above object, the present invention provides an aerial levitation body equipped with an antenna for electromagnetic environment measurement and a levitation propulsion means of a levitation body, and a position attached to the levitation body from the ground. A ground moving body having a function of detecting a three-dimensional spatial position of the levitation body by an angle detection mechanism and a payout length detection mechanism of the measurement cable, and having a function of controlling the movement of the levitation body by a control signal from the ground; Wired transmission means for transmitting the electromagnetic interference signal detected by the environment measurement antenna and the levitation propulsion control signal from the ground of the levitation body is provided, and the three-dimensional position detection signal is transmitted in the ground moving body. The electromagnetic environment signal thus generated is matched to measure and display the electromagnetic environment in an arbitrary space.

[0010]

In the present invention, the electromagnetic environment measuring antenna is mounted on the levitation body which can be moved in the air, and its arbitrary spatial position is detected from the ground by the angle and extension length of the position measuring cable attached to the levitation body. , Three-dimensional electromagnetic data by transmitting signals such as electromagnetic environment measurement data and aerial control data of the levitating body using a cable that connects the levitating body and the measurement / control unit installed in the moving body on the ground. The environment can be measured.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a conceptual diagram showing the outline of the measuring system of the present invention. In the figure, reference numeral 12 is an electromagnetic environment measurement antenna, 13 is a levitation body equipped with the antenna 12 and capable of moving in the air, and 14 ₁ and 14 ₂ are levitation propulsion including levitation of the levitation body 13 and vanes for moving in the air. Means, 15 is an aerial movement block unit such as a control mounted on the levitation body 13. Reference numeral 16 is a ground block section including a measurement / control device mounted in the ground vehicle 20, 16a is a three-dimensional position measurement block section for measuring the spatial position of the levitation body 13 mounted on the mobile vehicle 20, and 17 is a levitation unit. An optical fiber cable for connecting the aerial movement block section 15 in the body 13 and the ground block section 16, 18 is a lightweight cable for measuring the position of the levitation body 13 in the measurement block section 16a, and 19 is attached to the moving vehicle 20. It is a cable feeding portion of the optical fiber cable 17.

FIG. 2 is a block diagram of the aerial movement block unit 15 of FIG.
It is an Example of the present invention showing the concrete composition of three-dimensional position measurement block part 16a and ground block part 16. Here, 17 ₁ and 17 ₂ are core wires of the optical fiber cable 17 which are independent of each other, and 17 ₁ is for an electromagnetic environment measurement signal, 1
7 ₂ constitutes respective transmission lines for the levitating body drive control signal. 24 and 25 are these optical fiber cables 1
7 ₁ , 17 ₂ is an optical-electrical (O / E) converter in the air-moving block unit 15 connected to the unit, and 26 is a floating body control signal sent from the ground block unit 16 side through the cable 17 ₂ . The selection / distribution circuit units 27 ₁ and 27 ₂ are drive circuit units for driving the levitation propulsion means 14 ₁ and 14 ₂ to levitate / move the levitation body 13.

Next, 28 and 29 are optical fiber cables 1.
Ground moving block unit 1 connected to 7 ₁ and 17 ₂ respectively
6, an electro-optical (E / O) converter, 30 is a measurement for receiving and measuring an electromagnetic environment signal sent from the measurement antenna 12 of the levitation body 13 via its cable 17 ₁ and E / O converter 29. A signal reception measurement unit, 31 is a sweep activation unit for operating the reception measurement unit 30 by a three-dimensional position signal described later, 32
Is a measurement / position signal matching unit that matches the output of the reception measurement unit 30 and the three-dimensional position signal to make a correspondence between the spatial position and the measurement data, and 33 is an image of the output of the measurement / position signal matching unit 32, and displays the image. It is the drawing department.

Reference numeral 34 is a three-dimensional position signal receiving section for receiving a signal from the three-dimensional position measuring block section 16a and transmitting an output to the sweep starting section 31 and the measurement / position signal matching section 32. It is a levitation body control signal transmission unit that transmits a signal for controlling the levitation propulsion means 14 ₁ and 14 ₂ by an output from the dimensional position signal reception unit 34 or independently of this, and this control signal E / O converter 2
8. The optical fiber cable 17 ₂ is used to deliver the floating block 13 in the floating body 13 to the aerial moving block section 15.

Further, 36 is the position measuring cable 1
8 is a levitation body tracking device that detects the spatial position of the levitation body 13, 37 is an elevation angle signal detection unit that detects the elevation angle of the three-dimensional position measurement cable 18, and 38 is a three-dimensional position measurement cable 18. A horizontal rotation angle signal detector for detecting the horizontal rotation angle, 39 is a cable for measuring three-dimensional position 18
The cable pay-out length detecting unit as a distance detecting means for detecting the pay-out length, and 40 is a three-dimensional position calculating unit for obtaining a three-dimensional position from the angle signals and length signals.

FIG. 3 shows an embodiment of the structure of an aerial levitation body 13 part consisting of an aerial movement block section 15, a measurement antenna 12 and levitation propulsion means 14 ₁ and 14 ₂ , which is a levitation propulsion means composed of two sets of rotary vanes. The blades of each set of 14 ₁ and 14 ₂ rotate in the same direction, and the blades of different sets rotate in opposite directions to obtain a stable buoyancy by the offsetting action of the torque. Further, the horizontal progression changes due to the change in the rotational speed of the same set, and the levitation body 13 rotates due to the change in the rotational speed of the different set.

Further, the electromagnetic environment measuring antenna 12 has a structure such as a wide band three-axis orthogonal dipole antenna that can respond to incoming radio waves from various directions without rotating, and the levitation propulsion means 14 ₁ , such as a motor, In order to reduce the influence of the radiation interference wave from the drive source of 14 ₂ , it is suspended from the levitation body 13 with a necessary distance d.

FIG. 4 shows another embodiment of the part of the floating body 13 in FIG. 3, and 41 is a balloon in which helium gas or the like is sealed. In-air movement block unit 15 including measurement antenna 12
The buoyancy is reduced by only the levitation propulsion means 14 ₁ and 14 _{2 with} respect to the weight of helium gas by adjusting the pressure and capacity of the helium gas sealed in the balloon 41. The levitation propulsion means 14 ₁ ,
To control the speed and direction of the 14 _second blades are to be moved through the air in any direction by applying pulses of different pulse widths or periods for such drive source (such as a motor).

With reference to FIGS. 1 to 4 shown above, an example of the method according to the present invention for obtaining the three-dimensional distribution of the isoelectric field lines around the radiated emission source as shown in FIG. 11 will be described below. The floating body 13 is mounted on the moving vehicle 20 in FIG.
Stop at any position. Next, a control signal is sent from the levitation body control signal sending section 35 of FIG. 2 to the midair moving block section 15 in the levitation body 13 via the E / O converter 28 and the optical fiber cable 17 ₂ , and this control signal is sent. O / E converter 25
To receive. As a result, the signal is supplied to the drive circuit units 27 ₁ and 27 ₂ via the selection / distribution circuit unit 26 to drive each of the levitation propulsion units 14 ₁ and 14 ₂ to levitate the levitation body 13 in the air and move it. The vehicle is moved in an arbitrary space in the horizontal and vertical directions within the range determined by the cable length with the stop position of the vehicle 20 as the center.

The levitation body tracking device 36 is activated during the movement of the levitation body, and the three-dimensional position information receiving section 34 detects the three-dimensional position information obtained from the three-dimensional position measurement block section 16a. The sweep activation unit 31 is operated by this detection output signal to capture the electromagnetic environment measurement signal detected by the measurement antenna 12 coming from the levitation body 13 via the optical fiber cable 17 ₁ into the reception measurement unit 30, The detection output signal from the three-dimensional position signal receiving unit 34 is input to the measurement / position signal matching unit 32, where the electromagnetic environment measurement signal and the spatial position signal are processed in a corresponding manner, and a storage unit (not shown) is provided. Store the data in. If necessary at this stage, the processed data such as the isoelectric field lines are displayed on the screen by the drawing unit 33. The drive energy of the selective distribution circuit section 26 and the drive circuit sections 27 ₁ and 27 ₂ in the levitation body 13 is obtained by using a levitation body-mounted battery (not shown).

After the above operation is completed, the levitation body 13 is collected by the moving vehicle 20, then moved to another road position and the same operation is repeated, and then E in FIG.
Equal electric field lines can be easily obtained as indicated by 1 and E2. These isoelectric field lines are not based on the estimated curves based on the data on the road according to the related art as shown in FIG. 12, but are based on the measured data at each position. It shows an accurate actual environmental condition no matter what the degree.

In the above embodiment, the case where the sweep starter 31 is operated by the detection output signal from the three-dimensional position signal receiver 34 and the incoming interfering wave signal to the reception measurement unit 30 is taken in by this output has been described. However, the reception measurement unit 30
In the case where the incoming signal from the measurement antenna 12 is stored in the memory for each self-sweep, and the output is sent to the measurement / position signal matching unit 32 when the three-dimensional position detection signal is input. Good.

Further, the method of sending the drive of the levitation body 13 independently of the detection signal of the three-dimensional position signal receiving section 34 from the levitation body control signal sending section 35 has been described. It goes without saying that a control signal may be sent from the control signal sending unit 35 to control the spatial position of the floating body 13.

FIG. 5 shows that when the length l of the optical fiber cable 17 becomes long, the weight thereof prevents the cable from hanging down and coming into contact with obstacles in the vicinity to restrict the movement of the levitation body 13 in the air. This is an embodiment in which means is added, and an auxiliary balloon 42 for lifting the cable is provided for each predetermined optical fiber cable length l _i , l _j . At this time, if a helium gas having a volume and atmospheric pressure that cancels the cable weights of the predetermined cable lengths l _i and l _{j is} previously enclosed in the auxiliary balloon 42, the distance from the stopped moving vehicle 20 to the levitation body 13 can be increased. Even if there is an obstacle, such as a building or a tree in the middle, the hanging portion of the cable 17 can be lifted, so that the obstacle can be avoided and the electromagnetic environment of a wider space can be measured.

FIG. 6 shows an embodiment in which the auxiliary balloon 42 of FIG. 5 is further provided with a propulsion means, 43 is an auxiliary balloon propulsion means similar to the levitation propulsion means 14 ₁ and 14 _{2 of the} levitation body 13, and 44 is a light. It is a branching unit for branching and selecting only the control signal of the fiber cable 17 to the auxiliary balloon propulsion unit 43. Since the auxiliary balloon 42 is provided with the propulsion means 43 as described above, the auxiliary balloon 42 together with the levitation body 13 can be controlled in the air by the control from the ground portion, so that it is possible to avoid the cable contact with the obstacle and increase the height. There is an advantage that the electromagnetic environment can be easily measured at any spatial position even in an area where buildings with different directions are densely packed.

FIG. 7 shows an embodiment of the optical fiber cable feeding portion 19 of the measuring system according to the present invention, 51 is a feeding guide axially movable outside the cable drum 50, 52 is a motor for rotating the cable drum 50, 53
Is a rotating disk that freely rotates the cable drum 50 in a horizontal plane by the tension of the optical fiber cable 17, and 54 is a motor that controls the rotation of the rotating disk 53. Levitator 1
It is necessary to control the motor 54 so that the cable drum 50 is always in the direction perpendicular to the cable tension applied when the cable is fed out in the propulsion drive control of No. 3, and to control the rotation of the rotating disk 53, and to give the cable a predetermined reaction force. The motor 52 controls the cable so that it does not sag.

After the measurement, the floating body 13 is moved to the moving vehicle 2
When collecting to 0, the feeding guide 51 is moved in the axial direction of the cable drum 50 so that the optical fiber cable 17 is uniformly wound. By using the cable feeding portion 19 as described above, the cable feeding and winding can be easily performed during the levitation propulsion control of the levitation body 13.

FIG. 8 shows an embodiment in which the measurement by the electromagnetic environment measuring antenna in the measuring system of the present invention is carried out by using the optical power feeding type antenna, 12a is an optical power feeding type antenna, 45 is a light source such as a semiconductor laser, 46 is a light source 45 based on an electric signal detected by the optical power feeding type antenna 12a.
It is an optical modulator that changes the amplitude of light from. Since such an optical power feeding type antenna 12a is lightweight and has a wide band characteristic, there is an advantage that the weight for mounting the levitation body can be lightened, and the band of the electromagnetic environment measurement can be widened without exchanging the antenna. In the figure, the same reference numerals indicate the same or corresponding parts, and 17 ₃ indicates the core wire of the optical fiber cable 17 connecting the light source 45 and the O / E converter 24 a in the levitation body 13.

FIG. 9 shows an embodiment in which the independent two-core optical fiber cables 17 ₁ and 17 ₂ shown in FIG.
₄ is an optical fiber cable for floating body control / electromagnetic environment measurement signals, 47 is an O / E conversion branch circuit section on the side of the floating body 13 to which the fiber cable 17 ₄ is connected, and 48 is a cable 1
7 is an E / O conversion branch circuit unit on the side of the ground block unit 16 to which 7 ₄ is connected.

[0030] In the present embodiment transmits the buoyant body control signals and electromagnetic measuring signal by using the same optical fiber cable 17 ₄ is used to branch each on both sides of the O / E converter branch circuit unit 47 and 48 Since it is configured as described above, the number of optical fiber core wires is reduced as compared with FIG. 2, and there is an advantage that the weight is reduced.

FIG. 10 shows 3 in the measuring system of the present invention.
It is an embodiment of the dimensional position measurement block portion 16a, 61 is a feeding guide which is movable axially outside the cable drum 60, 62 is a motor for rotating the cable drum 60, 6
Reference numeral 3 is a rotary disk that freely rotates the cable drum 60 in a horizontal plane by the tension of the position measuring cable 18, and reference numeral 64 is a motor that controls the rotation of the rotary disk 63. While controlling the rotation of the rotating disk 63 by controlling the motor 62 so that the cable drum 60 is always in the direction perpendicular to the cable tension applied when the cable is extended in the propulsion drive control of the levitation body 13, the cable is given a predetermined reaction force. The motor 62 controls so that the cable does not sag more than necessary.

Further, 65 is a horizontal rotation angle measuring mechanism for detecting the horizontal rotation angle of the rotary disk 63, 66 is an elevation angle measuring mechanism for measuring the elevation angle of the measurement cable 18, and 67 is a rotary encoder for detecting the cable extension length. ,
Assuming that the position measuring cable 18 is lightweight and slack, the payout length is the distance between the moving vehicle 20 and the levitation body 13. Further, the cable distance may be detected by marking the cable with a scale. A three-dimensional position is detected from these horizontal angle, elevation angle and distance. Further, when the floating body 13 is collected in the moving vehicle 20 after the measurement is completed, the feeding guide 61 is moved in the axial direction of the cable drum 60 so that the cable 18 can be wound evenly. By using such a cable feeding portion, the three-dimensional position of the levitation body 13 can be easily measured.

The present invention is not limited to the above embodiment, and an optical fiber cable for transmission may be a fine coaxial cable. By this,
Since it is not necessary to mount the E / O converter on the levitation body, the levitation body can be reduced in weight.

[0034]

As described above, the electromagnetic environment measuring apparatus of the present invention uses an levitation body equipped with an antenna for electromagnetic environment measurement to arbitrarily move around a radiated interference source in the air to measure an electromagnetic environment measurement signal and a levitation body. In addition to transmitting the control signal using a cable, the aerial position of the levitation body is detected three-dimensionally from the levitation body tracking device on the ground, and the ground data is displayed correspondingly with the measurement data signal in a corresponding manner. Therefore, it is possible to measure and display the electromagnetic environment in the space without roads in association with the three-dimensional position. Moreover, since each transmission signal is exchanged using a cable such as an optical fiber that does not affect the electromagnetic environment, there is an advantage that stable and highly accurate measurement and control can be performed.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an outline of a measurement system of the present invention.

FIG. 2 is a specific configuration diagram of an aerial movement block unit and a ground block unit according to the present embodiment.

FIG. 3 is a schematic diagram of an aerial levitation body according to the present embodiment.

FIG. 4 is a schematic diagram of a modified example of the floating body in FIG.

FIG. 5 is a schematic diagram illustrating an example of a cable lifting means using an auxiliary levitation body according to the present invention.

FIG. 6 is a schematic view for explaining an embodiment of an auxiliary levitation body having a propulsion means in the present invention.

FIG. 7 is a configuration diagram of an optical fiber cable feeding portion of the present embodiment.

FIG. 8 is a configuration diagram showing an embodiment of a measurement system using an optical power feeding type antenna according to the present invention.

FIG. 9 is a configuration diagram showing an embodiment of a measurement system in which the floating body control signal / measurement signal transmission line is shared according to the present invention.

FIG. 10 is a configuration diagram of a three-dimensional position measurement block unit using the lightweight cable of the present embodiment.

FIG. 11 is an explanatory view of a method for estimating the distribution of the isoelectric field lines around the radiated interference wave according to the present invention.

FIG. 12 is a configuration diagram of a conventional measurement system.

[Explanation of symbols]

12 Electromagnetic environment measurement antenna 13 Levitating body 14 ₁ , 14 ₂ Levitating propulsion means 15 Aerial moving block section 16 Ground block section 16a 3D position measurement block section 17 Optical fiber cable 17 ₁ , 17 ₂ Optical fiber cable core wire 18 3D position Lightweight cable for measurement 19 Cable feeding section 20 Ground mobile vehicle 24,25 Optical-electrical (O / E) converter 26 Floating body control signal selection / distribution circuit section 27 ₁ , 27 ₂ Drive circuit section 28, 29 Electric-optical (E / O) converter 30 Measurement signal reception measurement unit 31 Sweep drive unit 32 Measurement / position signal matching unit 33 Drawing unit 34 Three-dimensional position signal reception unit 35 Levitating body control signal sending unit 36 Levitating body tracking device 37 Elevation angle signal Detection unit 38 Horizontal rotation angle angle signal detection unit 39 Cable extension length detection unit (distance detection unit) 40 Three-dimensional position calculation unit

Claims (1)

[Claims] 1. An aerial levitation body equipped with an electromagnetic environment measuring antenna and a levitation propulsion means of a levitation body, and an angle detection mechanism and a payout length detection mechanism of a position measurement cable attached to the levitation body from the ground. A three-dimensional spatial position detection of the floating body, and a ground moving body having a function of controlling the movement of the floating body in response to a control signal from the ground; and an electromagnetic interference signal detected by the electromagnetic environment measurement antenna,
Wired transmission means for transmitting a levitation propulsion control signal from the ground of the levitation body using a cable is provided, and the three-dimensional position detection signal and the electromagnetic environment signal transmitted in the ground movement body are matched to each other in an arbitrary space. An electromagnetic environment measuring device characterized by measuring and displaying an electromagnetic environment.