JPS618615A - Device for detecting and tracking position of substance - Google Patents

Abstract

PURPOSE:To detect the position of the substance for object by providing plurally loops in coil in the object area for measurement and by equipping with the device generating the change in magnetic flux on the substance for object. CONSTITUTION:The detection of the position of the substance for object or the tracking of the substance thereof is performed by observing the electromotive force generated on each loop 2a-2d due to electromagnetic induction according to the change in the magnetic flux which is from the equipped devices 41, 42...4n generating the change of the magnetic flux on the substances for object 31, 32... 3n, with the installation of plural loops 2a-2d in coils in the area 1 for measurement. As the result of said constitution, it is perceptible in which loop the substance for object is located through the observation of the electromotive force of each loop 2a-2d by the means of a filter 51, amplifier 52, computer 53, etc.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to an object position detection and tracking device.

This food can be used, for example, to detect and confirm the position of a moving person, and can thereby be used for behavioral analysis of group behavior. It can also be used to know the location of animals such as livestock, and can be used to detect the positions of various other objects and track their movements.

[Conventional technology]

In the technology of detecting and tracking the position of objects, when the target is a ship or an aircraft, various radars and navigation systems are being actively developed and used.

For example, a phase comparison navigation system is known in which the position of the slave station is determined by comparing the phase difference between the signals transmitted by a master station, which is a fixed station, and a slave station, which is a mobile station (a station owned by the object whose position is to be detected). (Tokuko Showan-21106 No. 56-21)
No. 107, No. 56-211.08, and many others). However, these systems require extensive equipment1 and cannot be used to conveniently detect the location of small moving objects. In particular, for detecting the position of a moving person as described above, for example, detecting the position for observing the behavior of a child, or accurately identifying the position of an animal, it is possible to easily and quickly achieve the desired degree. A device that can accurately determine the location of an object is required, but currently no device suitable for this purpose has been developed.

[Purpose of the invention]

In view of the above circumstances, the present invention is simple and does not require a large-scale device, can quickly detect and track the position of a target object, and has the desired position accuracy. It is an object of the present invention to provide an effective object position detection and tracking device that can measure the position of an object to the extent of .

[Structure of the invention]

In order to achieve this object, the object position detection/tracking device according to the present invention installs a plurality of linear loops in the measurement target area, and equips the target object with a device that generates a change in magnetic flux. The configuration is such that the position of a target object is detected or the object is tracked by observing the electromotive force generated in each loop by electromagnetic induction due to a signal change from the device.

The configuration of the present invention will be explained as follows with reference to the schematic diagram of FIG. 1, which schematically shows the present configuration.

In the measurement target area ■, there is a linear loop ■a.

Install multiple nb. In Figure 1, there are two loops Matn
Although the figure shows a case where a loop is provided, this can be set depending on the desired positional accuracy, and a loop may be formed by dividing into a large number of fine sections, and its configuration is arbitrary.

The target area T is assumed to be indoors in Figure 1, but it may also be outdoors, or in the air or underwater depending on the case.
Any place where a loop can be installed may be used depending on the desired target object. On the other hand, the target objects Ha and Ib to be observed
K: Equipped with devices iva and Hb that cause magnetic flux changes. In FIG. 1, a human being is shown as the target object, and the illustration is made assuming that a device that causes this magnetic flux change is installed under the human's feet, for example, the soles of shoes. Of course, the target object is arbitrary, and it can be applied to humans such as children playing, workers working, and elderly people living alone, as well as animals such as livestock or protected animals, and land vehicles such as cars and bicycles. It can also be applied to ships, aircraft, etc., to detect and track their positions.

Furthermore, although the objects are two objects in FIG. 1, they may be Fil objects, or a larger number of objects may be the objects to be observed. When a constant cycle change in magnetic flux occurs from the devices ffa and ffb that cause changes in the magnetic flux of the target objects 1a and Ib, this signal causes each loop...a r Ilb to generate a change according to the principle of electromagnetic induction. Electricity is generated. This electromotive force is applied to each roof'l[a.

Devices that cause changes in Hb and magnetic flux ffa, lVb
The positional relationship between the objects Ha and Wb corresponds to the positional relationship between each luzo la and Ib and the target objects Ha and Wb, so by observing this electromotive force, the target object 1a+I
The position of point b is detected and tracked.

In FIG. 1, a filter (P-wave device) Va and an amplifier vb are illustrated as the observation means V, but it can be further connected to a combinator or the like for analysis. The reason why filter Va is used is because in Fig. 1, the target objects are assumed to be two objects a + Ib, so in this case, the frequency of the devices that cause changes in the magnetic flux of each constant period is changed, and for example, one device For the IVaO device, a magnetic velocity change is caused by applying a rectangular wave voltage of IKHz to the ring conductor, and for the other device IVb, if the period of magnetic flux change is set to 10 IG (z), this filter Va This is because a desired object can be detected and tracked.

(Note that it is efficient to use a pulsed signal as a rectangular wave, but any other signal that can generate an electromotive force in the loop may be used.) In the diagram, the loop...a + Ilb is shown in a plane. However, one roof Ib is installed perpendicularly to the other roof 1m, so that a three-dimensional loop la,
lb may be set to determine the spatial position of the target object.

[Action of the invention]

As a result of the above configuration, when the target object 1a, ][b enters the loop la, an electromotive force is generated on the roof la, and when it exits the loop Ha, the electromotive force is reversed, and it enters the Shisen's loop nb. If this is the case, the behavior will be such that an electromotive force is generated in this loop ub. From the observation pressure of such electromotive force, the position of the target objects 1a, lb can be detected or tracked.

[Constitution, etc., effects of other inventions of the present application]

In the above invention, a loop is installed in the measurement target area, and the target object is provided with a device that causes a change in magnetic flux, but this can also be reversed. That is, another invention of the present application is to install a device that causes a change in magnetic flux at each measurement position in a measurement target area, provide a loop forming a wire on the target object, and generate electromagnetic induction by the device that causes a change in magnetic flux. By observing the electromotive force generated in the loop, the position of the target object is detected or the object is tracked.

In this case, it is only necessary to provide a loop depending on the target object, so the number of loops may be one or more.

The electromotive force generated in the loop can be processed by the analysis means of the target object itself to determine its position. For example, if the target is a human being, if he or she is in an area that emits an IKHz signal, this can be known by looking at the analysis means that the person has, and if it is in a 2KHz area, the person's location can be determined. It can be configured so that the target itself can recognize its own position. Alternatively, the generated electromotive force can be sent to external analysis means using an FM transmitter or the like to detect and track the position. It is also possible to store the electromotive force in a storage device provided in the target object and analyze it later to learn the movement of the target object at the time of measurement.

〔Effect of the invention〕

As described above, the object position detection/tracking device of the present invention can easily and quickly detect and track the position of a target object without requiring a large-scale device, and can also track the target object. The effect is that the accuracy can be measured to a desired degree by setting the loop accordingly.

[Embodiments of the Invention] Next, some embodiments of the present invention will be described with reference to FIG. 2 and subsequent figures.

The position detection/tracking device shown in FIG. 2 is the first embodiment of the present invention, and as described above, a plurality of linear loops 2a to 2d (four loops in this example) are installed in the measurement target area 1. The target objects a, + 32 +..., 3n are equipped with devices 41 + 41 r..., 4n that cause changes in magnetic flux, and the changes in magnetic flux from the device cause electromagnetic induction to cause each roof '2a to By observing the electromotive force generated at 2d, the position of the target object is detected or the object is tracked.

Details of this example are as follows.

The measurement target area l is assumed to be indoors, and is
A to 2d are constructed by pasting vinyl wire or the like on the floor with adhesive tape or the like. Since the loops 2a to 2d only have to play the role of wire loops that generate induced electromotive force, any wire can be used.

It may be placed under the floor, but efficiency may decrease if it is placed far from the floor surface. Even when stretched on the floor, loop 2a
It is easy to make ~2d invisible.

Although the loops 2a to 2d are single loops in this example, they may be double loops or more. Then, the function as a ring becomes greater and the effect becomes greater.

The target object 3I... is a human being, and a device 41... that causes a change in magnetic flux is installed at the bottom of the foot. Specifically, this device was a pulse generator. It is best to carry this on shoes, suritsuno, etc. When this device 41 is installed at the bottom of the foot in this way, together with the provision of the loops 2a to 2d on the floor, an electromotive force is generated efficiently and effective observation can be achieved. In this example, it is assumed that the frequency of change in the magnetic flux of the four devices differs depending on each target 31. For example, I KHz, 10KHz.

It was designed to generate changes in magnetic flux at different frequencies, such as 100KHz. A device that causes a change in magnetic flux is, for example, a ring conductor as shown in Fig. 3 (see Fig. 4).
The third voltage obtained by applying a voltage as shown in al
A magnetic flux with a change as shown in Figure (bl) was adopted.By applying such a rectangular wave voltage, the change in voltage is sharp, which is advantageous for inducing an electromotive force in the loop.Others , any signal can be used as long as it has a waveform that generates an electromotive force.A device 41 that causes a change in magnetic flux...
・A copper wire coated with transparent paint was used as a coiled shield 48 to generate an electromotive force in the loop. The device 41 that causes such a change in magnetic flux can use a battery because a power supply voltage of about 4.5V is sufficient.

Loops 2a to 2d are 10m x 1. (In the figure, 1?IL is set to be large for clarity).

Here, we made 4 sections of 110mX4, but 10mX4
If the room is 10 m wide, a roof of this size will cover 10 m.
It becomes a section. If you want to know the location in detail, you can also take pictures at intervals of 5 cm. The formation and division of the climbing loop can be arbitrarily set as desired.

As a result of this configuration, it is possible to know which loop the target object is in by observing the electromotive force of each of the roofs 2a to 2d using means such as the filter 51, the amplifier 52, or a computer thief. Although the figure shows the observation means installed only in the first loop 2a, it goes without saying that this can be changed over by switching. Also, one after another, each roof 2a to 2
It is also possible to adopt a configuration in which the data of d is sequentially observed and analyzed.

Since the direction of the magnetic flux of the device 4 that causes a change in magnetic flux is opposite between the inner and outer sides of the coiled conducting wire 4a as shown in FIG. 4, pulses are generated as shown by the symbol A in FIG. If the inner side of the container 4 has a downward magnetic flux, the outer side has an upward magnetic flux like a code opening. From this, when the pulse generator of interest moves sequentially from position A to B and C, its movement can be tracked.

For example, in Figure 5, one roof 2 is taken out and shown in VC. If we focus on this loop, we can see that from position D in the figure, which is on the outside of loop 2, through position E, which is just above roof 2. , when the inner part of loop 2 is at position F, where the inner part of loop 2 is larger, the output nozzle from the nosolus generator is as shown in Figure 6 (al), then when it is at position E, it is as shown in Figure 6 (bl
The electromotive force was as shown in Figure 6 (
cl and reverses, which allows us to know the position movement.

Furthermore, when a device that causes a change in magnetic flux generates an electromotive force in two or more loops, it is possible to determine which loop the observation target is in by comparing the strength of the electromotive force in each loop. It is also possible to perform detailed calculations to find out where the user is within the system.

As shown by broken lines 6 in FIG. 2, loops perpendicular to the roofs 2a to 2d may be further provided to form a grid pattern, thereby improving position accuracy and enabling precise tracking.

Figure 7 shows an example of a loop in the case of such a force, as follows: 2X1+ 2Xz p 2Yt + 2Y* + 2
Ys indicates a loop. It is also possible to arrange the loops three-dimensionally to detect and track the position of an object three-dimensionally.

Next, a case where a plurality of target objects are included in one loop will be described. As mentioned above, this embodiment includes a device that generates changes in magnetic flux at different frequencies for each target object, so several frequencies are induced in the same loop and must be separated. No.

Now, if the power applied to the device that causes a change in magnetic flux is in the form of a rectangular wave, the induced electromotive force generated in the loop will be in the form of pulses, but n induced pulses will enter the same loop. Suppose that In this case, from the same loop]
If the pulse signal enters the analyzer as shown in Figure 8,
When the frequency of each pulse is not that different, for example, a signal with a pulse width At and a signal with a pulse width Ai+1,
If Ai and Ai+1 are within one pulse width when looking at the pulse width at the time interval, the following procedure is performed. If a 7-cycle signal group (n pieces) is captured in a capture time that is about twice the maximum pulse width, then there must be n pulses assigned to that signal group. Therefore, if the i-th pulse were to drop out, the pulse train at fi intervals should disappear.

Thinking as above, when there is a sag/J russ group, we can assign a scale of 4 russ width Bi to the signal from the left as shown in Figure 9, and find that there is a pulse at the same location as that scale. If so, it can be determined that the pulse of width Bi is within that loop. (However, it is more reliable to apply the scale to the second or third scale rather than the first one, and to make sure that there are 9 ruths of width Bi regularly).

Next, the width of the scale is changed until the width of the width Bi determined in this way is omitted, and the width of the scale is changed until the next width of the width Bi+t is extracted, and the discrimination is performed in the same manner as described above.

If this is done for all the set pulse widths, or by applying the scale of pulse width Bl' as schematically shown in FIG.
It is possible to reliably identify which pulses are in the loop.

Next, referring to FIG. 11, a second embodiment of the present invention will be described. In this example as well, the measurement space IK is the measurement target area.
It is provided with a plurality of loops XI + yt . . . forming a linear ring.

In this example system, as shown in FIG. 11, there is a parent system P consisting of four CPUs, etc., and a Lube child sensor x1. x2. ..., Xyn
.

y,,y2. It has a structure in which a loop child sensor system consisting of Yn..., Yn is connected by a pass line L. In the figure, La is a data fetching data bus, and Lb is a data fetching command path line. allentee system p
h Although it is possible to store data directly on media such as floppy disks, when analyzing the stored data, it is necessary to transfer the data to another large computer system, so temporary data storage is not recommended. It seems that it is enough to have RAM. A microprocessor that can be combined with this (a device that can become an intelligent terminal in a large computer center, such as a PC8001)
, PC8801, PC9801, Ir2O3, etc.), it is also possible to design the device with emphasis on its role as a measurement unit for position recognition.

The Lube child sensor in this example system may be of any type as long as it can identify which frequency of induced electromotive force is occurring in each loop, and it is assumed that it is controlled by the parent system.

The parent system of this example system has a function of controlling the Lube child sensor, and can instruct the Lube child sensor to start identification and send an identification result.

The configuration is such that the position information is taken in as described above, the position information of the individual is stored in the attached DRAM, and the information is sent to other microcombinators as necessary.

The device for changing the magnetic flux in this embodiment has a function of changing the magnetic flux at a constant frequency for individual identification. There is a voltage waveform oscillator as shown in the figure, and this is the first voltage that flows through a coiled loop.
A pulse-induced electromotive force as shown in FIG. 3 is generated in each of the Xi and Yi loops. This induced electromotive force is analyzed by the loop child sensor system and the parent system to detect and track the position of the target individual.

The system of this embodiment can be used, for example, to confirm the safety of elderly people living alone, to investigate the behavior of young children, to analyze the labor of office workers in the operation of office automation, or in the medical field, for example, to determine what kind of behavior is brought about by the administration of a certain drug. This method can be effectively applied to analyzes such as the above, and other psychological analyses, and can also be applied to animals such as livestock, vehicles, etc., and can be widely applied.

It should be noted that, as a matter of course, the present invention is not limited to the embodiments specifically described above.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining the present invention in detail. Fig. 2 is a block diagram schematically showing the first embodiment of the present invention, and Fig. 3 is a diagram showing the waveforms used in this example. The voltage waveform is shown, and (b) shows the waveform of the induced electromotive force induced in the loop. FIG. 4 is a diagram for explaining the magnetic flux generated by the device that generates a change in magnetic flux in this example, and FIGS. 5 and 6 explain the position of the device that generates a change in magnetic flux and the induced electromotive force. FIG. 7 is a structural diagram showing a loop in a modified example of the present example, and FIGS. 8 to 10 are schematic diagrams for explaining the identification of the helix-like induced electromotive force. 1st
1 to 13 show a second embodiment of the present invention;
Figure 1 is a diagram schematically showing the overall configuration, Figure 12 is a diagram showing changes in current applied to a device that generates changes in magnetic flux in order to generate pulsed induced electromotive force, and Figure 13 is a diagram showing the induced electromotive force generated in the loop. FIG. 1.1. , -Measurement target area (measurement space), I, Ila. ...b, 2.2a-2d, 2X1. 2>h +2Y1
+2Yz e2Ys...Loop, I+Ia+Ib,
a, 3. ...Target object (observation individual), N HW & H
■t' + 4 + 41...A device that generates changes in magnetic flux.

Claims (1)

[Claims] 1. A plurality of linear loops are installed in the measurement target area, a device is provided that causes a change in magnetic flux in the target object, and the electromotive force generated in each loop by electromagnetic induction is observed using the device. 1. An object position detection/tracking device that detects the position of a target object or tracks the object. 2. The device according to claim 1, wherein the device that causes a change in magnetic flux is a pulse generator or a device that generates a signal that changes the magnitude of current, such as a sine wave. Location detection and tracking equipment. 3. When there is a plurality of target objects, the device for changing the magnetic flux of each target object generates a signal with a different frequency. Location detection and tracking equipment. 4. A device that causes changes in magnetic flux is installed at each measurement position in the measurement target area, and the target object is provided with a linear loop, and the device that causes changes in magnetic flux generates a change in the loop due to electromagnetic induction. An object position detection/tracking device that detects the position of a target object or tracks the object by observing electric power.