JP2019174403A - Position detection system, receiving device, position detector, receiving method, position detection method, and computer program - Google Patents

Abstract

To provide a position detection system with which it is possible to detect the position of a moving object with higher accuracy.SOLUTION: Provided is a position detection system comprising: a receiver for receiving a transmitter signal transmitted by a transmitter and outputting a receiver signal that indicates that the transmitter signal is received; a passing unit for passing the transmitter signal through; and a shielding unit for shielding the transmitter signal. The passing unit is located at a point where the transmitter signal entering the receiver from a prescribed direction is passed through. The shielding unit includes a shielding member located at a point where the transmitter signal entering the receiver from other than the prescribed direction is shielded, and a position information acquisition unit for acquiring information that indicates the position of the transmitter on the basis of information indicating a space of a prescribed size that is predetermined on the basis of the position of the receiver, an expected angle of the passing unit as seen from the receiver and the direction of the passing unit as seen from the receiver, and the receiver signal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a position detection system, a reception device, a position detection device, a reception method, a position detection method, and a computer program.

  There is a position detection system (see Non-Patent Document 1) that detects the position of a user who owns a wireless transmitter based on whether or not a receiver has received a wireless signal emitted by the wireless transmitter. In this system, when the receiver receives a radio signal, it was found that there was a user in the vicinity of the receiver, but it was not known in which direction it was seen from the receiver. This system is a position detection system with higher positioning accuracy than a trilateral survey method using Wi-Fi (registered trademark) in a building or underground where GPS (Global Positioning System) cannot be used. Conventionally, however, in this system, it has not been known in which direction the user is seen from the receiver. Such a problem is not limited to the position detection of the user, but is a problem common to the general position detection of the moving body.

“What is Beacon?”, [Online], [Search on March 22, 2018], Internet <URL: https://boxil.jp/mag/a3631/>

  In view of the above circumstances, an object of the present invention is to provide a position detection system capable of detecting the position of a moving body with higher accuracy.

  One aspect of the present invention includes a receiver that receives a transmitter signal transmitted from a transmitter and outputs a receiver signal indicating that the transmitter signal has been received; a transmission unit that transmits the transmitter signal; and A shielding portion that shields the transmitter signal, and the transmission portion is located at a location that transmits the transmitter signal incident on the receiver from a predetermined direction, and the shielding portion is other than the predetermined direction. A shielding member located at a location that shields the transmitter signal incident on the receiver from the direction of, a position of the receiver, a prospective angle of the transmission portion seen from the receiver, and a view from the receiver. A position information acquisition unit that acquires information indicating a space having a predetermined area based on the direction of the transmission unit and information indicating the position of the transmitter based on the receiver signal; , A position detection system.

  One aspect of the present invention is the above-described position detection system, which includes the same number of the receivers and the shielding members, and the shielding members are housings that accommodate only one of the receivers, When the position information acquisition unit acquires a receiver signal indicating that the transmitter signal has been received from at least two of the receivers, the position information acquisition unit determines the width of the transmission unit relative to the distance between the receiver and the transmission unit. The transmitter position based on the receiver signal and the information indicating the space of a predetermined area determined in advance based on the information indicating, the direction of the location where the transmission unit is located with respect to the receiver Get information indicating

  One aspect of the present invention is the above-described position detection system, further including an absorbing member that absorbs part of the transmitter signal incident on the transmission unit from the predetermined direction.

  One aspect of the present invention is the above-described position detection system, wherein the absorption member is positioned in the vicinity of the transmission portion.

  According to the present invention, it is possible to provide a position detection system capable of detecting the position of a moving body with higher accuracy.

The figure which shows the specific system configuration | structure of the position detection system 100 in embodiment. The figure which shows the specific shape and arrangement | positioning of the housing | casing 11, the receiver 12, and the absorber 13 in embodiment. Explanatory drawing explaining using the side view of the receiving unit 1 that the receiving unit 1 does not receive the transmitter signal which injected into the shielding part 110 of the housing | casing 11 in embodiment. Explanatory drawing explaining the receiving unit 1 not receiving the transmitter signal which injected into the absorber 13 in embodiment using the side view of the receiving unit 1. FIG. Explanatory drawing explaining the receiving unit 1 receiving the transmitter signal in embodiment using the side view of the receiving unit 1. FIG. Explanatory drawing explaining the incident direction to the receiving unit 1 of the transmitter signal which the receiving unit 1 can receive in embodiment. Explanatory drawing explaining the receivable space in embodiment. The figure which shows the specific example of a function structure of the receiver 12 in embodiment. The figure which shows the specific example of a function structure of the aggregation server 2 in embodiment. The figure which shows the specific example of the active receiver information in embodiment. The figure which shows the specific example of the receiver information in embodiment. The figure which shows the specific example of the affiliation group information in embodiment. The flowchart which shows the flow of the specific process in which the aggregation server 2 in embodiment acquires the information which shows the position of the transmitter 9. FIG. The sequence diagram which shows the flow of the specific process in which the position detection system 100 of embodiment detects the position of the transmitter 9. FIG.

FIG. 1 is a diagram illustrating a specific system configuration of a position detection system 100 in the embodiment.
The position detection system 100 includes receiving units 1-1 to 1-N (N is an integer) and a counting server 2.

  The receiving unit 1-M (M is an integer of 1 to N) is a signal transmitted by radio waves transmitted from a transmitter 9 located at a predetermined location, and is a signal incident from a predetermined direction (hereinafter “transmitter”). Signal "). The transmitter signal is a signal indicating the identifier of the transmitter 9. When receiving the transmitter signal, the receiving unit 1-M outputs a signal indicating that the transmitter signal has been received (hereinafter referred to as “receiver signal”). A space in which the receiving unit 1-M can receive a transmitter signal transmitted from the transmitter 9 located inside is referred to as an Mth receivable space. For example, a space in which the transmitter 9 can be located, and a space in which the receiving unit 1-1 can receive a transmitter signal transmitted from the transmitter 9 located inside is referred to as a first receivable space. A space in which the transmitter 9 can be located and in which the receiving unit 1-3 can receive the transmitter signal transmitted by the transmitter 9 located inside is called a third receivable space. The receivable space is a space whose position is determined based on the position of the receiving unit 1. The overlap of receivable spaces is called overlapping space. The reception unit 1-M includes a housing 11-M, a receiver 12-M, and an absorber 13-M.

The housing 11-M shields the transmitter signal. The casing 11-M accommodates the receiver 12-M. The receiver 12-M receives a transmitter signal transmitted from the transmitter 9 located in the Mth receivable space and outputs a receiver signal. The reception unit 1-M receiving the transmitter signal specifically means that the receiver 12-M receives the transmitter signal. Further, the reception unit 1-M outputting a receiver signal specifically means that the receiver 12-M outputs a receiver signal. The absorber 13-M absorbs the signal transmitted from the transmitter 9.
Hereinafter, when the receiving units 1-1 to 1-M are not distinguished from each other, they are referred to as receiving units 1. Hereinafter, the casings 11-1 to 11-M are referred to as the casings 11 when not distinguished from each other. Hereinafter, when the receivers 12-1 to 12-M are not distinguished from each other, they are referred to as receivers 12. Hereinafter, when the absorbers 13-1 to 13-M are not distinguished from each other, they are referred to as the absorber 13. Hereinafter, when the first receivable area to the Mth receivable area are not distinguished, they are referred to as receivable areas.

  The aggregation server 2 acquires the receiver signal output from the receiving unit 1-M via the communication network, and acquires information indicating the position of the transmitter 9 based on the acquired receiver signal.

The transmitter signal that is not received by the receiving unit 1 and the transmitter signal that is received by the receiving unit 1 will be described with reference to FIGS.
FIG. 2 is a diagram illustrating specific shapes and arrangements of the housing 11, the receiver 12, and the absorber 13 in the embodiment. The side view of FIG. 2 is a side view of the receiving unit 1. The front view of FIG. 2 is a view of the receiving unit 1 viewed from a direction perpendicular to the side surface of the receiving unit 1. As shown in the side view and front view of FIG. 2, the housing 11 is a cylindrical member having a circular bottom. As for the housing | casing 11, a side surface and a bottom face shield a transmitter signal, and an upper end permeate | transmits a transmitter signal. Hereinafter, the side surface and the bottom surface are referred to as a shielding portion 110. Hereinafter, the upper end is referred to as a transmission part 111. The casing 11 is disposed so as to surround the receiver 12. Note that the casing 11 does not necessarily need to be a cylindrical member having a circular bottom as long as it has a shape surrounding the receiver 12 and has an opening. The housing 11 may be, for example, a cylindrical member having a transmissive portion 111 at the upper end and a rectangular bottom, or a transmissive portion 111 having a trapezoidal bottom at the upper end. A cylindrical member may be sufficient. The absorber 13 is located in the vicinity of the transmission part 111 of the housing 11.

FIG. 3 is an explanatory diagram for explaining that the receiving unit 1 does not receive the transmitter signal incident on the shielding unit 110 of the housing 11 in the embodiment, using a side view of the receiving unit 1.
The radio wave 80 that has entered the shielding unit 110 of the housing 11 from the outside of the receiving unit 1 is reflected by the shielding unit 110. Therefore, the radio wave 80 cannot reach the receiver 12. In FIG. 3, the shielding unit 110 shields the radio wave 80 by reflecting the radio wave 80, but the shielding unit 110 may shield the radio wave 80 by absorbing the radio wave 80. The radio wave 80 is a specific example of a transmitter signal.
Thus, the receiving unit 1 does not receive the transmitter signal that has entered the shielding unit 110 from the outside of the receiving unit 1.

FIG. 4 is an explanatory diagram for explaining that the receiving unit 1 does not receive the transmitter signal incident on the absorber 13 in the embodiment, using a side view of the receiving unit 1.
The radio wave 81 enters the receiving unit 1 from the transmission part 111 of the housing 11. The radio wave 81 enters the absorber 13 before reaching the receiver 12. The radio wave 81 incident on the absorber 13 is absorbed by the absorber 13. If the receiving unit 1 does not have the absorber 13, the radio wave 81 reaches the receiver 12 by being reflected by the shielding unit 110 of the housing 11. However, since the receiving unit 1 includes the absorber 13, the radio wave 81 does not reach the receiver 12. Therefore, the radio wave 81 is not received by the receiver 12. The radio wave 81 is a specific example of a transmitter signal.
Thus, the receiving unit 1 having the absorber 13 does not receive the transmitter signal incident from the direction incident on the absorber 13.

FIG. 5 is an explanatory diagram for explaining that the receiving unit 1 receives the transmitter signal in the embodiment, using a side view of the receiving unit 1.
The radio wave 82 enters the receiving unit 1 from the transmission part 111 of the housing 11. The radio wave 82 reaches the receiver 12 without entering the absorber 13. Therefore, the radio wave 82 is received by the receiver 12. The radio wave 82 is a specific example of a transmitter signal.
Thus, the receiving unit 1 receives the transmitter signal that passes through the transmission unit 111 and is directly incident on the receiver 12.

FIG. 6 is an explanatory diagram for explaining the incident direction of the transmitter signal that can be received by the receiving unit 1 in the embodiment to the receiving unit 1.
The radio wave 83 enters the transmission unit 111 from the outside of the reception unit 1, passes through the end point H <b> 1 that is the end of the absorber 13 in the positive direction of the X axis, and enters the receiver 12. The radio wave 84 enters the transmission unit 111 from the outside of the reception unit 1, passes through the end point H <b> 2 that is the end of the absorber 13 in the positive direction of the X axis, and enters the receiver 12. Hereinafter, the angle formed between the radio wave 83 or the radio wave 84 and the central axis of the receiving unit 1 is defined as θ.
A radio wave whose angle formed with the central axis of the receiving unit 1 is larger than θ does not reach the receiver 12 because it enters the absorber 13. Therefore, the receiving unit 1 does not receive radio waves whose angle with the central axis of the receiving unit 1 is larger than θ. The central axis of the receiving unit 1 is the central axis of a cylindrical member that is the casing 11 and is an axis parallel to the X axis in FIG.
The radio wave 83 and the radio wave 84 are specific examples of transmitter signals.

  Thus, the receiving unit 1 receives only the transmitter signal incident on the transmission unit 111 of the receiving unit 1 from the direction in which the angle formed with the central axis of the receiving unit 1 is an angle of θ or less.

FIG. 7 is an explanatory diagram illustrating a receivable space in the embodiment.
As described with reference to FIG. 2 to FIG. 6, the receiving unit 1 is configured such that only the transmitter signal that enters the transmission unit 111 of the receiving unit 1 from the direction in which the angle formed with the central axis of the receiving unit 1 is smaller than θ. Receive. In general, the signal attenuates as the transmission distance increases. Therefore, the transmitter signal is transmitted at a strength that can be received by the receiver 12 only up to a predetermined distance from the transmitter 9. This means that the receiver 12 cannot receive unless the transmitter signal is transmitted from the transmitter 9 whose distance from the receiver 12 is within a predetermined distance (hereinafter referred to as “receivable distance”). . Therefore, the receivable space is a space surrounded by a straight line connecting the receiver 12 and the end point H1 and a straight line connecting the receiver 12 and the end point H2, and the distance from the receiver 12 is within the receivable distance. It is a space of a certain finite size.
Thus, the receivable space is not only based on the position of the receiving unit 1, but also based on the angle of view of the transmission unit 111 viewed from the receiver 12 and the direction in which the receiver 12 views the transmission unit 111. It is a space whose size and position are determined.

  FIG. 8 is a diagram illustrating a specific example of a functional configuration of the receiver 12 in the embodiment. The receiver 12 includes a CPU (Central Processing Unit), a memory, an auxiliary storage device 122, and the like connected by a bus, and executes a program. The receiver 12 functions as an apparatus including the receiver 121, the receiver signal generation unit 123, and the transmission unit 124 by executing the program.

The receiver 12 includes an interface for receiving a transmitter signal transmitted from the transmitter 9. The receiver 121 receives a transmitter signal transmitted from the transmitter 9.
The auxiliary storage device 122 is configured using a storage device such as a magnetic hard disk device or a semiconductor storage device. The auxiliary storage device 122 stores the identifier of the receiver 121.
The receiver signal generation unit 123 acquires a transmitter signal and generates a receiver signal. The receiver signal indicates the identifier of the transmitter 9 that is the source of the acquired transmitter signal and the identifier of the receiver 12.
The transmission unit 124 includes a communication interface for connecting the receiver 12 to the aggregation server 2. The transmission unit 124 communicates with the aggregation server 2 via a communication network.

  FIG. 9 is a diagram illustrating a specific example of a functional configuration of the aggregation server 2 in the embodiment. The aggregation server 2 includes a CPU (Central Processing Unit), a memory, an auxiliary storage device 202, and the like connected by a bus, and executes a program. The aggregation server 2 functions as an apparatus including the reception unit 201 and the position information acquisition unit 203 by executing the program.

  The receiving unit 201 includes a communication interface for connecting the aggregation server 2 to the receiver 12. The receiving unit 201 receives the receiver signal transmitted from the receiver 12 via the communication network.

  The auxiliary storage device 202 is configured using a storage device such as a magnetic hard disk device or a semiconductor storage device. The auxiliary storage device 202 stores active receiver information, receiver information, and affiliation group information. The active receiver information indicates an active receiver. An active receiver is a receiver 12 that has acquired a transmitter signal, and is a receiver 12 in a predetermined period (hereinafter referred to as an “active period”) whose start time is the time at which the transmitter signal is acquired. . Hereinafter, when the receiver 12 is an active receiver, the receiver 12 is said to be active. The receiver information includes information indicating a position where the receiver 12 is installed, a group to which the receiver 12 belongs (hereinafter referred to as “belonging group”), and a length of time during which the receiver 12 is an active receiver ( Hereinafter referred to as “active time”). The affiliation group is a set of receivers 12 that satisfy a predetermined condition. The aggregation server 2 acquires information indicating the position of the transmitter 9 when all the receivers 12 in the group to which it belongs are active receivers. The belonging group information indicates information related to the belonging group.

FIG. 10 is a diagram illustrating a specific example of the active receiver information in the embodiment. The active receiver information is stored in the auxiliary storage device 202 as, for example, an active receiver information table D110 shown in FIG. The active receiver information table D110 has a record for each “transmitter ID”. Each record has each value of “JSN-1”, “JSN-2”..., “JSN-N”. “Transmitter ID” represents the identifier of the transmitter 9. “JSN-1” indicates whether or not the receiver 12 whose identifier is JSN-1 is an active receiver that has received the transmitter signal transmitted by the transmitter 9 indicated by “transmitter ID”. “JSN-1” has a value representing “Active” and “NonActive”. “Active” indicates that the receiver 12 having the identifier JSN-1 is an active receiver that has received the transmitter signal transmitted by the transmitter 9 indicated by “transmitter ID”. “NonActive” indicates that the receiver 12 whose identifier is JSN-1 is not an active receiver. The same applies to “JSN-2” to “JSN-N”. That is, “JSN-M” indicates whether or not the receiver 12 whose identifier is JSN-M is an active receiver that has received the transmitter signal transmitted by the transmitter 9 indicated by “transmitter ID”. . “JSN-M” has values representing “Active” and “NonActive”. “Active” indicates that the receiver 12 whose identifier is JSN-M is an active receiver that has received the transmitter signal transmitted by the transmitter 9 indicated by “transmitter ID”. “NonActive” indicates that the receiver 12 whose identifier is JSN-M is not an active receiver.
Note that the receiver 12 having the identifier “JSN-1” may be, for example, the receiver 12-1. The receiver 12 whose identifier is “JSN-2” may be, for example, the receiver 12-2.
For example, the record D111 indicates that the receiver 12-1 having the identifier JSN-1 is an active receiver that has received the transmitter signal transmitted from the transmitter 9 having the identifier HSN1. The record D111 indicates that the receiver 12 with the identifier JSN-2, the receiver 12 with the identifier JSN-3, and the receiver 12 with the identifier JSN-N are not active receivers. .

FIG. 11 is a diagram illustrating a specific example of receiver information in the embodiment. The receiver information is stored in the auxiliary storage device 202, for example, as a receiver information table D120 shown in FIG. The receiver information table D120 has a record for each “receiver ID”. Each record has values of “receiver ID”, “location information”, “affiliation group”, and “active time”. “Receiver ID” represents the identifier of the receiver 12.
“Position information” indicates the position where the receiver 12 indicated by the “receiver ID” is installed. “Affiliation group” represents an affiliation group to which the receiver 12 indicated by the “receiver ID” belongs. “Active time” represents the active time of the receiver 12.
For example, in the record D121, the receiver 12 having the identifier “JSN-1” is located in the place represented by north 1 east 3 and belongs to the group G1 and belongs to the group G1, and after receiving the transmitter signal. Indicates that the receiver is active for 1 minute.

FIG. 12 is a diagram illustrating a specific example of belonging group information in the embodiment. The belonging group information is stored in the auxiliary storage device 202 as, for example, an belonging group information table D130 shown in FIG. The affiliation group information table D130 has a record for each “group name”. Each record has values of “group name”, “affiliated receiver”, and “group overlap space”. “Group name” represents the name of the group to which the user belongs.
“Affiliated receiver” represents the receiver 12 belonging to the belonging group represented by “group name”. For example, “belonging receiver” may represent the receiver 12 by the identifier of the receiver 12.
The “group overlap space” represents an overlap space (hereinafter referred to as “group overlap space”) where the receivable spaces of the receivers 12 belonging to the belonging group overlap.
For example, the record D131 indicates that the receiver 12 belonging to the group having the group name “group G1” is the receiver 12 having the identifier JSN-1 and the receiver 12 having the identifier JSN-2. . Further, the record 131 represents that the overlapping space is a space called AREA1.

  Returning to the description of FIG. The position information acquisition unit 203 acquires information indicating the position of the transmitter 9 based on the receiver signal received by the reception unit 201. The position information acquisition unit 203 includes an active management unit 204, an active group determination unit 205, and an overlapping space information acquisition unit 206.

  The active management unit 204 executes activation processing based on the receiver signal. The activation process is a process of recording in the auxiliary storage device 202 that the receiver 12 indicated by the receiver signal is an active receiver that has received the transmitter signal transmitted by the transmitter 9 indicated by the receiver signal. In addition, the active management unit 204 executes the deactivation process when the active time of the receiver 12 indicated by the receiver signal has elapsed after receiving the receiver signal. The deactivation process is a process of recording in the auxiliary storage device 202 the receiver 12 that has acquired the transmitter signal transmitted from the transmitter 9 indicated by the receiver signal as being a receiver 12 that is not an active receiver. . The receiver 12 indicated by the receiver signal is the receiver 12 that has transmitted the receiver signal. Hereinafter, the receiver 12 indicated by the receiver signal is referred to as a signal transmission source receiver. The transmitter 9 indicated by the receiver signal is the transmitter 9 that has transmitted the transmitter signal received by the receiver 12 that has transmitted the receiver signal. Hereinafter, the transmitter 9 indicated by the receiver signal is referred to as a source transmitter.

  Based on the receiver signal, the active group determination unit 205 determines whether the group to which the signal transmission source receiver belongs is active. The belonging group being active means that all the receivers 12 belonging to the belonging group are the same active receiver as the source transmitter.

  The overlap space information acquisition unit 206 acquires information indicating the group overlap space (hereinafter referred to as “group overlap space information”) based on the determination result of the active group determination unit 205. Specifically, the overlap space information acquisition unit 206 acquires group overlap space information of the belonging group that the active group determination unit 205 determines to be active.

FIG. 13 is a flowchart illustrating a specific processing flow in which the aggregation server 2 according to the embodiment acquires information indicating the position of the transmitter 9.
The receiving unit 201 receives a receiver signal (step S101). The active management unit 204 records the signal source receiver in the auxiliary storage device 202 as an active receiver that has received the transmitter signal transmitted by the source transmitter (step S102). Specifically, by executing the following processing, the active management unit 204 records the signal transmission source receiver in the auxiliary storage device 202 as an active receiver that has received the transmitter signal transmitted from the transmission source transmitter. To do. The active management unit 204 refers to the active receiver information table D110 stored in the auxiliary storage device 202. The active management unit 204 selects a record in which “transmitter ID” represents the identifier of the source transmitter. When the identifier of the signal transmission source receiver is JSN-M, the active management unit 204 rewrites the value of the item “JSN-M” of the selected record to a value indicating “Active”.

  The active group determination unit 205 determines whether or not the group to which the signal transmission source receiver belongs is active (step S103). Specifically, the active group determination unit 205 determines whether or not the group to which the signal transmission source receiver belongs is active by the following processing. The active group determination unit 205 refers to the receiver information table D120 stored in the auxiliary storage device 202. The active group determination unit 205 selects a record having a “receiver ID” value indicating the identifier of the signal transmission source receiver. The active group determination unit 205 acquires the value of the “affiliation group” item of the selected record. The active group determination unit 205 refers to the belonging group information. The active group determination unit 205 selects a record in which the value of “group name” represents the belonging group represented by the value of the “affiliation group” item. The active group determination unit 205 acquires the value of the item “belonging receiver” of the selected record. The active group determination unit 205 refers to the active receiver information table D110. The active group determination unit 205 selects a record in which “transmitter ID” represents the identifier of the source transmitter. The active group determination unit 205 acquires the value of the item “JSN-M” of the selected record when the identifier indicated by the acquired value of the “affiliated receiver” item is JSN-M. The active group determination unit 205 determines that the belonging group is active when all of the acquired values of the item “JSN-M” indicate “Active”. The active group determination unit 205 determines that the belonging group is not active when at least one of the acquired values of the “JSN-M” item indicates “NonActive”.

  When the belonging group is active (step S103: YES), the overlapping space information acquisition unit 206 acquires group overlapping space information of the belonging group (step S104). Specifically, the overlap space information acquisition unit 206 acquires group overlap space information of the belonging group by the following processing. The overlapping space information acquisition unit 206 refers to the belonging group information table D130. The overlapping space information acquisition unit 206 selects a record in which the value of “group name” represents the group to which the member belongs. The overlap space information acquisition unit 206 acquires the value of the “group overlap space” item of the selected record. The space indicated by the value of the acquired “group overlap space” item is a space where the transmitter 9 is located (that is, a space where the user is located).

  If the belonging group is not active (step S103: NO), the aggregation server 2 repeats the control shown in FIG.

FIG. 14 is a sequence diagram illustrating a specific processing flow in which the position detection system 100 according to the embodiment detects the position of the transmitter 9.
The first receiver receives the transmitter signal transmitted from the transmitter 9 (step S201). The first receiver is a specific example of the receiver 12, and is, for example, the receiver 12-1. The first receiver transmits a receiver signal to the communication network (step S202). The aggregation server 2 receives the receiver signal in step S202 via the communication network (step S203). The aggregation server 2 records the receiver indicated by the receiver signal (that is, the first receiver) in the auxiliary storage device 202 as an active receiver (step S204). The aggregation server 2 determines that the group to which the first receiver belongs is not active (step S205).
The second receiver receives the transmitter signal transmitted from the transmitter 9 (step S206). The second receiver is a specific example of the receiver 12 belonging to the same group as the first receiver, and is, for example, the receiver 12-2. In FIG. 14, it is assumed that only the first receiver and the second receiver belong to the group to which the first receiver and the second receiver belong.
The second receiver transmits a receiver signal to the communication network (step S207). The aggregation server 2 receives the receiver signal in step S207 via the communication network (step S208). The aggregation server 2 records the receiver indicated by the receiver signal (that is, the second receiver) in the auxiliary storage device 202 as an active receiver (step S209). The aggregation server 2 determines that the group to which the second receiver belongs is active (step S210). The aggregation server 2 acquires group overlap space information (step S211). The aggregation server 2 outputs group overlap space information to a display unit (not shown) (step S212).

  Since the position detection system 100 of the embodiment configured as described above includes the casing 11 that shields the transmitter signal, the receiver 12 receives only the transmitter signal incident on the transmission unit 111 from a predetermined direction. The transmitter signal incident on the shielding unit 110 is shielded. Therefore, the user of the position detection system 100 can know the direction in which the transmitter 9 that is the transmission source of the transmitter signal is located.

  Further, the position detection system 100 of the embodiment configured as described above includes a plurality of receivers 12, and whether or not the transmitter 9 is located in an overlapping space of the receivable spaces of the plurality of receivers 12, Information indicating the position of the transmitter 9 is acquired. Therefore, the position detection system 100 can detect the position of the transmitter 9 that is the transmission source of the transmitter signal with higher accuracy.

  The position detection system 100 according to the embodiment configured as described above includes the absorber 13. Therefore, the user of the position detection system 100 can control the size of the receivable space of the receiver 12 only by changing the absorber 13 without changing the housing 11.

(Modification)
The position detection system 100 does not necessarily include a plurality of receiving units 1 and may include a single receiving unit 1. In this case, the receivable space and the overlapping space coincide.

(Application example)
The position detection system 100 of this embodiment is installed in an exhibition hall, for example. In this case, the visitors of the exhibition hall turn on the transmitter 9 so that the user of the position detection system 100 can know in which exhibits many people are gathered.

  The housing 11 is an example of a shielding member. The absorber 13 is an example of an absorbing member. The direction in which the radio wave 80 and the radio wave 81 are incident is an example of a direction other than a predetermined direction. The “group overlap space” is an example of information indicating a space having a predetermined area. The angle θ formed is an example of information indicating the width of the transmission part with respect to the distance between the receiver and the transmission part. The receiver 12 is an example of a receiving unit. The receiving unit 1 is an example of a receiving device. The aggregation server 2 is an example of a position detection device.

Note that all or some of the functions of the receiver 12 and the aggregation server 2 of the embodiment use hardware such as an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). May be realized. The program may be recorded on a computer-readable recording medium. The computer-readable recording medium is, for example, a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built in the computer system. The program may be transmitted via a telecommunication line.
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Reception unit, 2 ... Aggregation server, 11 ... Housing, 12 ... Receiver, 13 ... Absorber, 110 ... Shielding part, 111 ... Transmission part, 121 ... Receiver, 122 ... Auxiliary storage device, 123 ... Receiver Signal generation unit 124... Transmission unit 201. Reception unit 202 202 Auxiliary storage device 203. Position information acquisition unit 204 Active management unit 205 Active group determination unit 206 overlap space information acquisition unit

Claims (8)

A receiver that receives a transmitter signal transmitted from a transmitter and outputs a receiver signal indicating that the transmitter signal has been received; a transmission unit that transmits the transmitter signal; and a shield that blocks the transmitter signal. The transmission unit is located at a location that transmits the transmitter signal incident on the reception unit from a predetermined direction, and the shielding unit is directed to the reception unit from a direction other than the predetermined direction. A receiving device comprising: a shielding member positioned at a location that shields the incident transmitter signal;
Information indicating a space of a predetermined area determined in advance based on the position of the receiving unit, the angle of view of the transmitting unit viewed from the receiving unit, and the direction of the transmitting unit viewed from the receiving unit; A position detection device for acquiring information indicating a position of the transmitter based on the receiver signal;
Comprising
Position detection system. Comprising at least two receiving devices;
When the position detection device acquires a receiver signal indicating that the transmitter signal has been received from at least two of the reception devices, the position detection device determines the width of the transmission unit relative to the distance between the reception unit and the transmission unit. Position of the transmitter based on the receiver signal and information indicating a space of a predetermined area determined in advance based on the information indicating, the direction of the location where the transmission unit is located with respect to the receiver Get information indicating
The position detection system according to claim 1. A receiver that receives a transmitter signal transmitted by a transmitter and outputs a receiver signal indicating that the transmitter signal has been received;
The transmission unit includes a transmission unit that transmits the transmitter signal and a shielding unit that blocks the transmitter signal, and the transmission unit is located at a position that transmits the transmitter signal incident on the reception unit from a predetermined direction. The shielding unit is a shielding member located at a location that shields the transmitter signal incident on the receiving unit from a direction other than the predetermined direction;
Comprising
Receiver device. A receiver that receives a transmitter signal transmitted from a transmitter and outputs a receiver signal indicating that the transmitter signal has been received, a transmission unit that transmits the transmitter signal, and a shielding unit that shields the transmitter signal And the transmission unit is located at a location that transmits the transmitter signal incident on the reception unit from a predetermined direction, and the shielding unit is incident on the reception unit from a direction other than the predetermined direction. Receiving the receiver signal output from a receiving device including a shielding member positioned at a location where the transmitter signal is shielded, and receiving the position of the receiving unit, the expected angle of the transmitting unit viewed from the receiving unit, and the reception Position information for acquiring information indicating the position of the transmitter based on information indicating a space of a predetermined area determined in advance based on the direction of the transmission part viewed from a part and the receiver signal Acquisition department,
A position detection device comprising: A receiver that receives a transmitter signal transmitted from a transmitter and outputs a receiver signal indicating that the transmitter signal has been received; a transmission unit that transmits the transmitter signal; and a shield that blocks the transmitter signal. And the transmission unit is located at a location that transmits the transmitter signal incident on the reception unit from a predetermined direction, and the shielding unit is incident on the reception unit from a direction other than the predetermined direction. A receiving unit that receives the transmitter signal incident from the predetermined direction on the transmitting portion of a shielding member located at a location that shields the transmitter signal, and an output step of outputting the receiver signal;
Information indicating a space of a predetermined area determined in advance based on the position of the receiving unit, the angle of view of the transmitting unit viewed from the receiving unit, and the direction of the transmitting unit viewed from the receiving unit; A position detecting step for obtaining information indicating a position of the transmitter based on the receiver signal;
Having
Position detection method. A receiver that receives a transmitter signal transmitted from a transmitter and outputs a receiver signal indicating that the transmitter signal has been received; a transmission unit that transmits the transmitter signal; and a shield that blocks the transmitter signal. The transmission unit is located at a location that transmits the transmitter signal incident on the reception unit from a predetermined direction, and the shielding unit is directed to the reception unit from a direction other than the predetermined direction. A receiving method comprising: a shielding member positioned at a location where the incident transmitter signal is shielded;
The receiving unit receives the transmitter signal transmitted by the transmitter, and outputs the receiver signal;
A shielding step in which the shielding unit shields the transmitter signal; and
Having
Receiving method. A receiver that receives a transmitter signal transmitted from a transmitter and outputs a receiver signal indicating that the transmitter signal has been received, a transmission unit that transmits the transmitter signal, and a shielding unit that shields the transmitter signal And the transmission unit is located at a location that transmits the transmitter signal incident on the reception unit from a predetermined direction, and the shielding unit is incident on the reception unit from a direction other than the predetermined direction. Receiving the receiver signal output from a receiving device including a shielding member positioned at a location where the transmitter signal is shielded, and receiving the position of the receiving unit, the expected angle of the transmitting unit viewed from the receiving unit, and the reception Position information for acquiring information indicating the position of the transmitter based on information indicating a space of a predetermined area determined in advance based on the direction of the transmission part viewed from a part and the receiver signal Acquisition step,
Having
Position detection method.   A computer program for causing a computer to function as the position detection device according to claim 4.

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