JP2007057232A - Position determination system and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a position determination system capable of simultaneously determining a plurality of positions of monitoring targets, optionally specifying the watching region, adapting even in case no access port is present, and precisely determining a position. <P>SOLUTION: The position determination system comprises: the transmitters 5, 6, and 7 which are mounted on or carried by each monitoring target respectively; the plurality of receivers 8 and 9 for receiving the radio waves transmitted by the transmitters 5, 6 and 7; and the position determination device 10 connected with the plurality of receivers 8 and 9 through the cables 12 and 13 of the same transmission performance, respectively, for determining in which region in the monitoring space A the transmitters 5, 6 and 7 are present, based on the output signals of the plurality of receivers 8 and 9 through the cables 12 and 13. The position determination device 10 divides the monitoring space A into a plurality of spaces A1 and A2, and capable of respectively discriminating whether the transmitter is existing in the space or out of the space. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a position determination system and a control method thereof, and in particular, performs position determination of a monitoring target using wireless technology, and issues a warning when the monitoring target is located outside a predetermined area. The present invention relates to a position determination system and a control method thereof.

  Conventionally, various techniques for detecting the position of a monitoring target (a monitoring target person or a monitoring target) and performing a corresponding process have been proposed. For example, in the anti-theft system described in Patent Document 1, an electronic tag having a built-in IC chip having a communication function is attached to a target product, and the detection antenna and the reading are passed when the product is passed with the product. The writing device is arranged at the sales floor to communicate with the electronic tag, and the detection result of the reading / writing device is transmitted to the alarm device, so that a warning is given when goods are taken out illegally.

  Further, in the anti-theft system described in Patent Document 2, the first communication module is attached to the carrying article, the second communication module is carried by the owner of the carrying article, and the short communication between the first and second communication modules is performed. When a wireless signal of a distance wireless communication system is transmitted and the transmission of the wireless signal transmitted between them is stopped, an alarm signal for calling attention is generated to prevent the carrying goods from being stolen.

  Furthermore, in the position evaluation system described in Patent Document 3, time information is acquired using the GPS in the monitoring target, reception waveform information with a time reference is output from the monitoring target based on the time information, and the receiving means In each case, the position of the object is evaluated based on the arrival time difference of the received waveform information with the time reference, so that the position of the monitored object is evaluated with high accuracy.

Furthermore, in the technique described in Patent Document 4, the position data corresponding to the monitoring target measured using the GPS satellite is within a predetermined area based on the position of the position data acquired when operating the input device. Whether or not a monitoring target comes out of the predetermined area is issued.
Japanese Patent Laid-Open No. 7-254092 JP 2003-109127 A JP 2001-091623 A Japanese Patent Laid-Open No. 01-297577

  However, the technique described in the above-mentioned Patent Document 1 has a problem that it is necessary to provide an entrance / exit for the monitoring target to enter and exit, and cannot be applied in a situation where the entrance / exit cannot be provided.

  Further, in the technique described in Patent Document 2, it is impossible to set the monitoring target area accurately, and it is possible to set a detailed distance such as a warning point when the monitoring target moves, or to specify a monitoring range. There was a problem that you can't.

  Furthermore, in the techniques described in Patent Document 3 and Patent Document 4, there is a problem that the arithmetic processing is complicated, the apparatus configuration is large, complicated and expensive, and cannot be used in a building street, tunnel, underground, etc. was there.

  Therefore, the present invention has been made in view of the above-described problems in the prior art, and it is impossible to simultaneously determine the positions of a plurality of monitoring targets, freely specify the monitoring target area, and not to provide an entrance / exit. It is an object of the present invention to provide a position determination system that can be applied even in the case and can determine a position with high accuracy and a control method thereof.

  In order to solve the above problems, the present invention is a position determination system, which is attached to a monitoring target or carried and outputs a radio wave including an impulse-like detection signal, and from the transmitter A plurality of receivers that receive the output radio waves, and outputs from the plurality of receivers that are connected to the plurality of receivers via a communication path having the same signal transmission characteristics and transmitted via the communication path And a position determination device that determines in which position in the monitoring target space the transmitter is present based on a signal.

  According to the above configuration, each of the transmitters outputs a radio wave including an impulse-like detection signal, and the receiver receives the radio wave output from the transmitter. Accordingly, the position determination device determines in which position in the monitoring target space the transmitter is based on the output signals of the plurality of receivers transmitted via the communication path.

  In the position determination system, the position determination apparatus divides the monitoring target space into a plurality of spaces, and determines whether the transmitter exists in the space or outside the space for each space. You may make it do.

  Further, the position determination device determines whether or not the transmitter exists in a space permitted to exist in advance for each space, and the transmitter is located in a position other than the space permitted to exist in advance. If it is determined that it exists, a warning transmitter that issues a warning may be provided.

  Furthermore, each of the receivers may include a signal separation unit that separates radio waves transmitted from the plurality of transmitters.

  Furthermore, the signal separation unit may have a mono-multi circuit and separate the radio waves received substantially simultaneously.

  In addition, the position determination device includes a flip-flop circuit that generates a position detection signal indicating in which position in the monitoring target space the transmitter is present based on the reception timing of the detection signal. May be.

  Furthermore, signal cables having the same length may be used as the communication path in order to equalize signal transmission characteristics.

  Furthermore, when the transmitter is located at a predetermined position in the monitoring target space or outside the monitoring target space based on a predetermined condition, a warning transmitter that issues a warning to that effect may be provided. .

  In addition, the present invention provides a transmitter that is attached to a monitoring target or carried and outputs a radio wave including an impulse-like detection signal, a plurality of receivers, and a signal transmission characteristic for each of the plurality of receivers. A position determination system control method comprising: a position determination device connected via an equal communication path, and a reception process of receiving the radio wave output from a transmitter; And a position determination process for determining in which position in the monitoring target space the transmitter is present based on the output signals of the plurality of receivers. Thus, the position determination device determines in which position in the monitoring target space the transmitter is based on the output signals of the plurality of receivers transmitted via the communication path.

  In the control method of the position determination system, based on a predetermined condition, when the transmitter is located at a predetermined position in the monitoring target space or outside the monitoring target space, a warning transmission process for issuing an alarm indicating that effect You may make it prepare.

  According to the present invention, it is possible to determine the positions of a plurality of monitoring targets at the same time, freely specify a monitoring target area, and to apply a case where an entrance / exit cannot be provided. Judgment and corresponding processing (alarm etc.) can be performed.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. First, prior to the description of specific embodiments, the principle of the present invention will be described.

  In the present embodiment, a transmitter is attached to a monitoring target (monitoring subject and monitoring target), and a pulse signal is transmitted as a monitoring signal from the transmitter. The monitoring signal transmitted from the transmitter is received by a plurality of receivers. At this time, when the distances from the transmitters are equal (effectively equivalent to the case where the signal transmission characteristics are equal), the plurality of receivers should receive the monitoring signals at the same time.

  Therefore, if each receiver receives the monitoring signal at the same time, if the position determination device can receive the monitoring signal at the same time, the transmitter attached to the monitoring target, and hence the monitoring target The position can be specified. In other words, if the communication paths (cables, etc.) between each receiver and the position determination device are physically or logically equivalent (for example, they can be handled as the same signal delay amount), the position of the monitoring target can be specified. It will be possible.

  Next, a specific embodiment will be described with reference to FIG.

  In FIG. 1, a certain space A is divided into a first space A1 and a second space A2. A boundary between the first space A1 and the second space A2 is defined as a boundary 4. In this state, the first transmitter 5, the second transmitter 6, and the third transmitter 7 are each transmitting a position detection pulse signal having a specific period. On the other hand, the 1st receiver 8 and the 2nd receiver 9 receive the pulse signal for position detection of each cycle transmitted from the 1st transmitter 5, the 2nd transmitter 6, and the 3rd transmitter 7. The first cable 12 and the second cable 13 are physically (or logically) equal in signal transmission characteristics, and have the same signal transmission time. The first cable 12 is connected to the first receiver 8, and the second cable 13 is connected to the second receiver 9.

  The position determination device 10 receives a pulse signal corresponding to how fast the first transmitter 5, the second transmitter 6, and the third transmitter 7 arrive at either the first receiver 8 or the second receiver 9. Is determined. Then, the position determination device 10 determines whether each of the first transmitter 5, the second transmitter 6 and the third transmitter 7 exists in the first space A1, the second space A2, or the first space. It can be determined whether or not it exists at the boundary 4 between A1 and the second space A2.

  Further, the position determination device 10 determines whether the determined position of the first transmitter 5, the second transmitter 6 or the third transmitter 7 should not be present, that is, a position where a warning should be issued. Determine whether or not. As a result of the determination, if any of the first transmitter 5, the second transmitter 6 or the third transmitter 7 is present at the position where the warning is to be issued, the position determination device 10 issues a warning for the transmitter. The determination result is output to the warning transmitter 11. The warning transmitter 11 issues a warning when it is determined by the position determination device 10 to issue a warning.

  As shown in FIG. 2, the position determination device 10 includes a two-input OR circuit 16 in which a first pulse input P1 is input to one input terminal and a second pulse input P2 is input to the other input terminal; A first mono-multi circuit (first mono-multivibrator circuit) 17, a second mono-multi circuit (first mono-multivibrator circuit) 18, and an AND circuit 21 having a second pulse input P2 inputted to one input terminal; The first RS flip-flop circuit 26 to which the first pulse input P1 is input to the set terminal S1, and the second RS flip-flop circuit 27 to which the output of the AND circuit 21 is input to the set terminal S2.

  The first mono-multi circuit 17 expands the pulse width of the output signal of the OR circuit 16 that is the logical sum of the first pulse input P1 and the second pulse input P2 to a predetermined width, and outputs it to the second mono-multi circuit 18. After the pulse signal output from the first mono multi circuit 17 falls, the second mono multi circuit 18 receives a second new pulse signal in the OR circuit 16 of the first pulse input P1 and the second pulse input P2. If it has been input, the pulse width of the second new pulse is expanded to a predetermined width and output to the first NOR circuit 19 constituting the first RS flip-flop circuit 26.

  The first RS flip-flop circuit 26 has a first NOR circuit 19 in which the output of the second mono-multi circuit 18 is input to one input terminal, and an output of the first NOR circuit 19 is input to one input terminal as a set terminal S1. The first pulse input P <b> 1 is input to the other functioning input terminal, and the second NOR circuit 20 is connected to the one input terminal of the AND circuit 21.

  The second RS flip-flop circuit 27 has a third NOR circuit 22 connected to one input terminal functioning as the set terminal S2 and an output of the third NOR circuit 22 connected to one input terminal, and is reset. A warning reset signal ER is input to the other input terminal functioning as the terminal R, and an output terminal of the fourth NOR circuit 23 outputs a warning transmission output signal EO as the output terminal Q3.

  The output of the first RS flip-flop circuit 26 becomes “H” level when the first pulse input P1 is “L” level and the output of the second mono-multi circuit 18 is “H” level. The output of the AND circuit 21 becomes “H” level when the output of the first RS flip-flop circuit 26 is “H” level and the second pulse input P2 is “H” level.

  When the output of the AND circuit 21 is “H” level, that is, when the input of the third NOR circuit 22 of the second RS flip-flop 27 is “H” level and the warning reset signal ER is “L” level, the warning transmission output signal EO becomes “H” level and a warning is issued.

  Here, a more specific operation will be described. In the following description, the positions of the first transmitter 5, the second transmitter 6, and the third transmitter 7 that are carried or installed in the monitoring target (monitoring person or monitoring target) are detected and monitored. A description will be given assuming that a warning is issued when the target moves from the first space A1 to the second space A2, and the first receiver 8 and the second receiver 9 are attached so as to satisfy the above conditions.

  The first transmitter 5, the second transmitter 6, and the third transmitter 7 each transmit an impulse-shaped position detection pulse signal having an inherent period to the first receiver 8 and the second receiver 9. The first receiver 8 and the second receiver 9 receive this radio wave, and the first pulse 12 is input by the first cable 12 and the second cable 13 having the same length L so as to have the same transmission characteristics. It transmits to the position determination apparatus 10 as P1 and 2nd pulse input P2.

  Considering each of the first transmitter 5, the second transmitter 6 and the third transmitter 7, each position detection pulse signal is transmitted from each transmitter 5, 6, 7 to the first receiver 8 and the second receiver. The time (timing) transmitted to 9 is the same, and the length L of the first cable 12 and the second cable 13 is the same. Therefore, the time when the position detection pulse signal is input to the position determination device 10 is the distance between each transmitter 5, 6, 7 and the first receiver 8 (indicated by reference numerals d1, d3, d5 in FIG. 1). Alternatively, it is determined by the distance between the transmitters 5, 6, 7 and the second receiver 9 (indicated by symbols d2, d4, d6 in FIG. 1).

  In other words, the time at which the position detection pulse signal output from the first transmitter 5, the second transmitter 6 or the third transmitter 7 reaches the first receiver 8 or the second receiver 9 is determined. By comparing with the device 10, the distance d1 from the first transmitter 5 to the first receiver 8 and the distance d2 from the first transmitter 5 to the second receiver 9 are known. Similarly, the distance d3 from the second transmitter 6 to the first receiver 8, the distance d4 from the second transmitter 6 to the second receiver 9, and the distance d5 from the third transmitter 7 to the first receiver 8 Thus, the distance d6 from the third transmitter 7 to the second receiver 9 is known.

  More specifically, the case of the first transmitter 5 will be described. The transmission time of the position detection pulse signal of the first transmitter 5 is t0, and the position detection pulse signal is transmitted from the first transmitter 5 to the first receiver. 8 is t1, and the time taken for the position detection pulse signal from the first receiver 8 to reach the position determination device 10 is t2, the first transmitter 5 through the first receiver 8 The time ta at which the position detection pulse is transmitted to the position determination device 10 is expressed by the following equation.

ta = t0 + t1 + t2
On the other hand, the time required for the position detection pulse signal from the first transmitter 5 to reach the second receiver 9 is t4, and the time required for the position detection pulse signal from the second receiver 9 to reach the position determination device 10 is Since t2, the time tb at which the position detection pulse is transmitted from the first transmitter 5 to the position determination device 10 via the second receiver 9 is expressed by the following equation.

tb = t0 + t4 + t2
Therefore, the difference between the two times (= ta−tb) is as follows.

ta-tb = t1-t4
At this time,
t1-t4> 0
If d1> d2
Thus, it can be determined that the first transmitter 5 exists in the second space A2.

Also,
tb-ta = t4-t1
And
t4-t1> 0
If it is,
d2> d1
Thus, it can be determined that the first transmitter 5 exists in the first space A1.

  If it can be determined whether the monitoring target exists in the first space A1 or the second space A2, the position determination device 10 next determines whether the transmitter exists within the range set by the monitor. As a result of the determination, if it is determined that it is out of the range, a warning is issued from the warning transmitter 11.

The above is the case of the first transmitter 5, but in the same way, in the case of the second transmitter 6,
d3> d4
In the case of the third transmitter 7 that exists in the second space A2,
d5≈d6
Thus, it can be determined that the boundary exists between the first space A1 and the second space A2.

  Here, the time t1 from the first transmitter 5 until the position detection pulse signal reaches the first receiver 8 and the time until the position detection pulse signal from the first transmitter 5 reaches the second receiver 9. In this embodiment, a flip-flop circuit is used in the position determination device 10 to realize a function for determining which of t4 is shorter, and this function is realized with a simple circuit configuration.

  Here, an operation when the above determination is performed will be described. In the following description, it is assumed that a warning is issued when a transmitter is present in the second space A2 shown in FIG. 1, and the second transmitter 6 is present in the second space A2 and issues a warning. The operation of the case is described.

  First, the presence of the second transmitter 6 in the second space A2 means that the second pulse input P2 reaches the position determination device 10 earlier than the first pulse input P1. This is because the position determination device 10 is installed at an equal distance from the first receiver 8 and the second receiver 9 as described above. Therefore, first, the second pulse input P2 reaches the position determination device 10 via the second receiver 9 and is input before the first pulse input P1. The second pulse input P2 passes through the OR circuit 16 of FIG. 2, has its pulse width expanded by the first mono-multi circuit 17, and is input to the first RS flip-flop circuit 26.

  After this, the first pulse input P1 is input via the first receiver 8, and after the pulse signal output from the first monomulti circuit 17 falls, the second monomulti circuit 18 causes the pulse width. And is input to the first RS flip-flop circuit 26. As a result, the first pulse input P1 and the second pulse input P2 are prevented from entering a prohibited input state in which the first RS flip-flop circuit 26 is simultaneously input.

  The output of the first RS flip-flop circuit 26 is connected to the AND circuit 21 by the second pulse input P2 that has entered the first RS flip-flop circuit 26 and the first pulse input P1 that has not yet reached. Q1 becomes “H” level, and the inverting output terminal Q2 not connected to the AND circuit 21 becomes “L” level.

  Next, the output of the AND circuit 21 that is the logical product of the “H” level of the output terminal Q1 and the second pulse input P2 that has arrived first becomes the “H” level, and the set terminal of the second RS flip-flop circuit 27 Input to S2. Here, in this explanation, since it is assumed that a warning is issued, the warning reset signal ER is at “L” level, and the warning transmission output signal EO is at “H” level, and a warning is issued.

  When there is a transmitter (corresponding to the first transmitter 5) in the first space A1 and no warning is issued, the first pulse input P1 enters before the second pulse input P2, and one of the AND circuits 21 The input terminal is at “H” level, but the output of the AND circuit 21 is at “L” level because the second pulse input P2 terminal is at “L” level. In this case, since no warning is issued, the warning reset signal ER is at the “H” level, and the warning transmission output signal EO is at the “L” level so that no warning is issued.

  As described above, the position determination apparatus 10 of the present embodiment has a timing function for selecting and receiving a signal from one transmitter, so even when there are a plurality of transmitters. Can be applied.

  Here, the operations of the first mono-multi circuit 17 and the second mono-multi circuit 18 will be described with reference to FIG.

  First, it is assumed that the receiver closer to the transmitter has the first pulse input P1. Subsequently, it is assumed that there is a second pulse input P2 at a receiver farther from the transmitter. Here, when the first mono-multi circuit 17 in FIG. 2 detects the first pulse P1, the first mono-multi circuit 17 raises the pulse and continues to rise for the set time (= the pulse width is changed). After expanding, it falls. As the output of the first mono-multi circuit 17 falls, this time, the second mono-multi circuit 18 raises the pulse and continues rising for a set time (= after expanding the pulse width) and then falls. . Here, when there is another pulse input, the second mono-multi circuit 18 extends the time during which it continues to rise, thereby enabling simultaneous reception from the transmitter.

  As shown in FIG. 4, when a command for designating a range in which a warning is not issued is given by a user who is a monitor, the position determination device 10 is set to issue an alarm when a monitoring target comes out of the range. (Step S11).

Next, the position detection pulse signal is transmitted from the first transmitter 5, the second transmitter 6 and the third transmitter 7 to the first receiver 8 and the second receiver 9 (step S12). Subsequently, the position determination device 10 determines the first transmitter 5, the second transmitter 6, or the third transmitter 7 based on the information transmitted from the first receiver 8 and the second receiver 9. The distance to the first receiver 8 and the second receiver 9 is detected for each of the first transmitter 5, the second transmitter 6 and the third transmitter 7 (step S13).
Next, from the distances d1, d2, d3, d4, d5, d6 from each of the first transmitter 5, the second transmitter 6 and the third transmitter 7 to the first receiver 8 or the second receiver 9, Distance relationship, that is,
d1> d2
Or
d3> d4
Or
d5> d6
Determine. (Step S14)
In the determination in step S14, the magnitude relationship of distances d1> d2
d3> d4
d5> d6
If any of the above is true (step S14; Yes), the transmitter (the first transmitter 5, the second transmitter 6, or the third transmitter 7) that satisfies this condition is present in the second space A2. Can be determined. Specifically, in the case of FIG. 1, it can be determined that the second transmitter 6 exists in the second space A2 (step S15).

  If none of the distance relations d1> d2, d3> d4, and d5> d6 apply (step S14; No), it is determined whether any of d1 = d2, d3 = d4, and d5 = d6. Determination is made (step S16).

In the determination of step S14, none of the distance relations d1> d2, d3> d4, d5> d6 applies, and in the determination of step S16, any of d1 = d2, d3 = d4, d5 = d6 If this is not the case (step S16; No), it can be determined that the transmitter in this condition exists in the first space A1. In the case of FIG. 1, it can be determined that the first transmitter 5 is present in the first space A1 (step S17).
In the determination of step S14, when none of the distance relations d1> d2, d3> d4, d5> d6 is satisfied (step S14; No), and in the determination of step S16, d1 = d2, d3 = D4, d5 = d6, it can be determined that the transmitter in this condition exists on the boundary 4 (or in the vicinity thereof) between the first space A1 and the second space A2 (step S18). . In the case of FIG. 1, it can be determined that the third transmitter 7 exists on the boundary 4 between the first space A1 and the second space A2.

  As described above, after it is determined that there is a transmitter in the first space A1, the second space A2, or the boundary 4, the transmitter is located in an area that does not issue a warning set by a user who is a monitor. It is determined whether or not (step S19).

  As a result of the determination in step S19, when it is determined that the transmitter is located in a region where no warning is issued (step S19; Yes), no warning is issued (step S20). The process proceeds to step S12, and the same operation is repeated thereafter.

  As a result of the determination in step S19, if it is determined that the transmitter is located outside the area where no warning is issued, that is, within the area where the warning is issued (step S19; No), a warning is issued. (Step S21).

  Thereafter, when an instruction to reset the state in which the warning is issued is given by the user who is a monitor, that is, when the warning reset signal ER is set to “H” level, the warning transmission output signal EO is set to “L”. "No level is issued and no warning is issued (step S22; Yes), the process proceeds to step S12 again, and the same process is repeated thereafter.

  Next, a modification of the embodiment of the present invention will be described. In this modification, the basic configuration is the same as that of the above embodiment, but in the modification of this embodiment, it is possible to set the monitoring setting range of the monitoring target in detail.

  In FIG. 5, the number of receivers is increased to eight. Each of the receivers 56 to 63 and the corresponding first position determination device 52 to fourth position determination device 55 are connected by corresponding cables 68 to 74. Corresponding warning transmitters 64 to 67 are connected to the first position determination device 52 to the fourth position determination device 55, respectively.

  Here, the first receiver 56 and the second receiver 57 can determine whether the transmitter to be monitored exists in either the fifth space A15 or the fourth space A14. Similarly, the third receiver 58 and the fourth receiver 59 can determine whether a transmitter to be monitored exists in either the fifth space A15 or the first space A11. Further, the fifth receiver 60 and the sixth receiver 61 can determine whether a transmitter to be monitored exists in either the fifth space A15 or the second space A12. Further, the seventh receiver 62 and the eighth receiver 63 can determine whether a transmitter to be monitored exists in either the fifth space A15 or the third space A13.

  The combination of the above eight receivers can determine whether the transmitter exists in the first space A11, the second space A12, the third space A13, the fourth space A14, or the fifth space A15. As compared with the case of only two, it is possible to specify a more detailed monitoring setting range.

  Next, another embodiment of the present invention will be described. In the other embodiments of the present invention, the basic configuration is the same as that of the above embodiment, but in the other embodiments, the monitoring setting range of the monitoring target can be freely set.

  In FIG. 6, the number of receivers is increased to 12. The first position determination device 88 to the sixth position determination device 93 corresponding to each receiver 76 to 87 are connected by corresponding cables 101 to 112. Corresponding warning transmitters 95 to 100 are connected to the first position determination device 88 to the sixth position determination device 93, respectively.

  Thereby, according to the 1st receiver 76 and the 2nd receiver 77, in which of the 1st space A21 and the 2nd space A22 the transmitter which the monitoring subject who is the monitoring object has exists exists. Can be judged. Further, the third receiver 78 and the fourth receiver 79 can also determine in which of the first space A21 and the second space A22 the transmitter carried by the monitored person to be monitored exists. . Furthermore, the fifth receiver 80 and the sixth receiver 81 can also determine whether there is a transmitter carried by the person being monitored in either the first space A21 or the second space A22. . Further, the seventh receiver 82 and the eighth receiver 83 can determine in which of the first space A21 and the third space A23 the transmitter carried by the person being monitored is present. Further, the ninth receiver 84 and the tenth receiver 85 can determine whether the transmitter carried by the monitored person in the first space A21 or the third space A23 exists. . Furthermore, the eleventh receiver 86 and the twelfth receiver 87 can also determine whether a transmitter as a monitored person exists in either the first space A21 or the third space A23.

  With the combination of the above 12 receivers, it is possible to determine whether the transmitter exists in the first space A21, the second space A22, or the third space A23, and it is possible to specify a free monitoring setting range. I understand that. By adopting such a configuration, application such as setting a monitoring range along the road becomes possible. Furthermore, it can be applied to a wider monitoring range by increasing the number of devices.

  According to each of the above embodiments, it is possible to distinguish and determine the pulses emitted from the transmitter by the mono-multi circuit without overlapping. A warning is issued when the user goes out of the set area, and the supervisor can be notified. In addition, since the number of transmitters corresponding to the monitoring target can be increased without changing the number of receivers, the system can be easily constructed when there are many monitoring targets, which is advantageous.

  Moreover, since it is discriminate | determined by the simple determination apparatus using a flip-flop, whether it is a monitoring object area regardless of a calculation means etc., it becomes a simple structure. In addition, since a flip-flop that operates at high speed is used to determine narrow pulse inputs and the operation is stable, determination is performed with an accuracy of 1 ns or less, and position determination in units of several centimeters is realized. it can.

  Furthermore, the receiver can be installed anywhere where it is desired to monitor, and the range to be monitored can be designated, so that it can be used in places where there is no doorway. By using this, it is possible to prevent a lost child or the like even if it is an object to be monitored such as an infant or a pet that moves with its own intention. Moreover, since it can be used where the sky field of view is not open, it can be determined regardless of the location.

  In the above description, a case where a signal cable having the same length is used as a communication path having the same signal transmission characteristic for each of the plurality of receivers has been described as an example. It is also possible to make the signal transmission path lengths equal to each other or to add transmission time information at each receiver so that the difference in transmission path length can be canceled.

1 is a schematic configuration block diagram showing an embodiment of a position determination system according to the present invention. It is a detailed block diagram of the position determination system shown in FIG. It is operation | movement explanatory drawing of the 1st mono multi circuit and the 2nd mono multi circuit of the position determination system shown in FIG. It is a timing chart which shows operation | movement of the whole apparatus of the position determination system shown in FIG. It is explanatory drawing of the modification of the position determination system concerning this invention. It is explanatory drawing of the modification of the position determination system concerning this invention.

Explanation of symbols

A space A1, A11, A21 first space A2, A12, A22 second space P1 first pulse input P2 second pulse input ER warning reset signal EO warning transmission output signal 4 boundary 5 first transmitter 6 second transmitter 7 Third transmitter 8 First receiver 9 Second receiver 10 Position determination device 11 Warning transmitter 12 First cable 13 Second cable 16 OR circuit 17 First mono-multi circuit 18 Second mono-multi circuit 19 First NOR circuit 20 2nd NOR circuit 21 AND circuit 22 3rd NOR circuit 23 4th NOR circuit,
26 1st RS flip-flop circuit 27 2nd RS flip-flop circuit 47 1st transmitter 48 2nd transmitter 49 3rd transmitter 50 4th transmitter 51 5th transmitter 52 1st position determination apparatus 53 2nd position determination apparatus 54 3rd position determination device 55 4th position determination device 56 1st receiver 57 2nd receiver 58 3rd receiver 59 4th receiver 60 5th receiver 61 6th receiver 62 7th receiver 63 8th reception Device 64 first warning transmitter 65 second warning transmitter 66 third warning transmitter 67 fourth warning transmitter 68 first cable 69 second cable 70 third cable 71 fourth cable 72 fifth cable 73 sixth cable 74 7th cable 75 8th cable 76 1st receiver 77 2nd receiver 78 3rd receiver 79 4th receiver 80 5th receiver 81 6th receiver 82 7th receiver 83 8th receiver 8 9th receiver 85 10th receiver 86 11th receiver 87 12th receiver 88 1st position determination apparatus 89 2nd position determination apparatus 90 3rd position determination apparatus 91 4th position determination apparatus 92 5th position determination Device 93 Sixth position determination device 94 First transmitter 95 First warning transmitter 96 Second warning transmitter 97 Third warning transmitter 98 Fourth warning transmitter 99 Fifth warning transmitter 100 Sixth warning transmitter 101 First Cable 102 2nd cable 103 3rd cable 104 4th cable 105 5th cable 106 6th cable 107 7th cable 108 8th cable 109 9th cable 110 10th cable 111 11th cable 112 12th cable

Claims (10)

A transmitter that is attached to a monitoring target or carried and outputs a radio wave including an impulse-like detection signal;
A plurality of receivers for receiving the radio waves output from the transmitter;
The plurality of receivers are connected to each other through communication paths having the same signal transmission characteristics, and based on the output signals of the plurality of receivers transmitted through the communication paths, the transmitter is connected in the monitoring target space. A position determination system comprising: a position determination device that determines which position is present.   The position determining device divides the monitoring target space into a plurality of spaces, and determines whether the transmitter exists in the space or outside the space for each space. The position determination system according to claim 1. The position determination device determines whether or not the transmitter is present in a space permitted to exist in advance for each space;
The position determination system according to claim 2, further comprising a warning transmitter that issues a warning when it is determined that the transmitter is present at a position other than a space permitted to exist in advance.   4. The position determination system according to claim 1, wherein each of the receivers includes a signal separation unit that separates radio waves transmitted from the plurality of transmitters.   The position determination system according to claim 4, wherein the signal separation unit includes a mono-multi circuit and separates the radio waves received substantially simultaneously.   The position determination device includes a flip-flop circuit that generates a position detection signal indicating in which position in the monitoring target space the transmitter is present based on the reception timing of the detection signal. The position determination system according to any one of claims 1 to 5.   The position determination system according to claim 1, wherein signal cables having the same length are used as the communication path so as to equalize signal transmission characteristics.   A warning transmitter that issues a warning to that effect when the transmitter is located at a predetermined position in the monitoring target space or outside the monitoring target space based on a predetermined condition. The position determination system according to any one of 1 to 7. A transmitter that is attached to a monitoring target or carried and outputs a radio wave including an impulse-shaped detection signal, a plurality of receivers, and a communication path having the same signal transmission characteristics as each of the plurality of receivers. In a control method of a position determination system comprising a position determination device connected in a line,
A receiving process for receiving the radio wave output from the transmitter;
A position determination step of determining in which position in the monitoring target space the transmitter is present based on the output signals of the plurality of receivers transmitted via the communication path, Control method for position determination system.   The method according to claim 1, further comprising a warning transmission process for issuing an alarm indicating that the transmitter is located at a predetermined position in the monitoring target space or outside the monitoring target space based on a predetermined condition. A control method for the position determination system according to claim 9.

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