JP4641753B2 - POSITION INFORMATION DETECTING SYSTEM AND POSITION INFORMATION DETECTING METHOD - Google Patents

Description

  The present invention relates to a position information detection system and a position information detection method for detecting identification and positional relationship of a moving object such as a ball or a player in a sports scene on a wide competition field such as soccer or baseball.

  2. Description of the Related Art Conventionally, there has been proposed a system for recording and judging the progress of a game by detecting the identification and positional relationship of a moving object such as a ball or a player in a sports scene on a wide competition field such as soccer or baseball.

  As such a system, for example, there is a technique disclosed in Patent Document 1. In this technique, a tag for transmitting ID data is attached to an object such as a player or a ball, and ID data is provided in a ground (competition field). A number of reader / writers that receive and recognize the data are arranged and embedded, the ID data is detected by these reader / writers, and the ID data is collected to determine the position of each player or ball.

  Specifically, as shown in FIG. 7, reader / writers R11 to R14, R21 to 24, R31 to 34, and R41 to 44 whose positions (coordinates) are known in advance are arranged on the ground, and sequentially from these reader / writers, When the received signal is collected and any one of the reader / writers detects specific ID data, the object to which the ID data is attached is present at the coordinate position of the reader / writer that detected the ID data. The position information determination apparatus 100 determines the position of the object.

For example, as shown in the figure, the reader / writer is sequentially driven to collect received signals, and when the target ball 6 is closest to the reader / writer R23, the reader / writer R23 reads the ID of the ball 6 In the position identification determination device 100, it is determined that the ball 6 exists on the coordinates where the reader / writer R23 is arranged.
JP 7-56990 A

  However, in the position information detection system disclosed in Patent Document 1 described above, since a large number of reader / writers are arranged on the ground, the reception area of each reader / writer is set to the minimum unit area in order to improve the resolution in the area. As a result, there is a problem that the number of readers is required by the number obtained by dividing the total ground area by the minimum unit area, resulting in a very expensive system.

  The present invention has been made to solve the above-mentioned problem, and in a sports scene on a wide competition field, when identifying the moving object such as a ball or a player and detecting the positional relationship, an ID identifying means such as a leader writer It is an object of the present invention to provide a position information detection system and a position information detection method that can reduce the system cost and reduce the system construction cost.

In order to solve the above-described problems, the present invention provides a position information detection system for detecting the position of an object existing in a predetermined area, wherein an object identifier signal unique to the object is provided in the object. A transmitting unit for transmitting, a plurality of receiving units arranged in the area and receiving the object identifier signal, a reader unit for reading the object identifier signal, and the object identifier signal read by the reader unit And a position information determination unit for determining a position of the object, and a displacement history of the object determined by the position information determination unit are stored. a displacement history storage unit for said one of the plurality of receiving portions, said selecting said receiving unit near moving position of the object predicted based on the displacement history stored in the displacement history storage unit While connected to the leader portion, and a signal selector unit which receives control of the object identifier signal by changing the wide or narrow in the reception range of the receiver connected to the reader unit.

In the present invention, an object identifier signal specific to the object is transmitted from the object, and an arbitrary receiving unit among a plurality of receiving units arranged in the region is selectively used as a reader unit that reads the object identifier signal. It connects, acquires the object identifier signal read from the receiving part connected to the reader part, specifies the receiving part which received the said object identifier signal, and determines the position of the object. At this time, among the multiple receiving units, select the receiving unit around the movement position of the object predicted based on the displacement history stored in the displacement history storage unit and connect to the reader unit, The reception control of the object identifier signal is performed by changing the width of the reception range of the reception unit connected to the reader unit.

According to the present invention as described above, by selectively connecting a plurality of receiving units to the reader unit by the signal selector unit, it is possible to acquire the object identification signal in the entire region by one reader unit. In addition, the installation cost of the leader section can be minimized, and the system construction cost can be reduced. Further, since the signal selector unit is configured to connect the receiving unit to the reader unit, it is possible to easily control the reception range of the object identifier signal. Further, the signal selector unit selects the receiving unit around the moving position of the target object predicted based on the displacement history of the target object and connects to the reader unit, and the receiving unit connected to the reader unit Since the reception control of the object identifier signal is performed by changing the width of the reception range, it is possible to improve the accuracy of specifying the position (resolution) of the object.

  In the above invention, the transmitting unit transmits the object identifier signal by an induced current due to the electromagnetic wave, the receiving unit outputs the electromagnetic wave, receives the object identifier signal transmitted according to the output of the electromagnetic wave, and the signal selector It is preferable that the unit selects an arbitrary receiving unit from among a large number of receiving units, executes output of electromagnetic waves, and connects to the reader unit. In this case, since the signal transmitted from the transmitter can be transmitted by the electromagnetic wave output from the receiver, a power source or the like is unnecessary on the transmitter, and the configuration of the transmitter is simplified to reduce the weight. The scope of application of the present invention can be expanded.

  In the above invention, the receiving unit receives object identifier signals at different positions or areas, and the position information determining unit determines the position of the object by a logical operation based on the position or area of each receiving unit. Is preferred. In this case, the number of receiving units can be reduced, or the frequency of driving the receiving units can be reduced, and the operating speed of the entire system can be improved.

  In the above invention, the apparatus further includes a displacement history storage unit that stores the displacement history of the object determined by the position information determination unit, and the signal selector unit acquires the displacement history stored in the displacement history storage unit and acquires the displacement history of the object. It is preferable to predict the displacement and preferentially connect the receiving unit around the predicted position of the object to the reader unit. In this case, it is possible to reduce the search area and reduce unnecessary operation of the receiving unit by predicting the movement of the object and operating the receiving unit and dynamically changing the location where position measurement is performed. And the scanning speed of the object can be improved.

  In the above-described invention, it is preferable that the reception unit can change the reception range or change the directivity based on control by the signal selector unit. In this case, by changing the reception range and directivity of the reception unit, it is possible to improve the accuracy (resolution) for specifying the position of the object.

  As described above, according to the present invention, in the sports scene on a wide competition field, the number of ID identifying means such as a leader writer is reduced when detecting the moving object such as a ball or a player and detecting the positional relationship. The system construction cost can be reduced.

(Configuration of position information detection system)
Embodiments of the present invention will be described with reference to the drawings. In this embodiment, a case where the present invention is applied to a soccer game will be described as an example. FIG. 1 is a perspective view showing a soccer game field according to the present embodiment, and FIG. 2 is a block diagram showing a configuration of a position information detection system provided in the soccer game field.

  As shown in FIG. 1, in this embodiment, the players 51 to 53 and the ball 6 existing in the soccer game field 4 which is a predetermined area are set as objects for position detection, and the positions of these objects are detected. The shoes 51a to 53a worn by the athletes 51 to 53 and the ball 6 are provided with RFID tags as transmitting parts. The RFID tag is a wireless IC tag that transmits an ID unique to each object as an object ID signal by radio waves, and includes a small IC chip and a metal antenna. Note that the RFID tag in this embodiment incorporates a power source such as a battery, and actively transmits information from the RF tag.

  Antennas A (A11-14, A21-24, A31-34, A41-44), which are a large number of receiving units, are embedded in the underground portion of the soccer field 4. The antenna A is a metal antenna that receives an object ID signal from an RFID tag of an object through radio waves, and as shown in FIG. 2, wirings L11 to 14, L21 to 24, L31 to 34, and L41, respectively. The signal selector unit 2 is connected to the signal selector unit 44, and a received signal is input to the reader / writer 3 through the signal selector unit 2. The reader / writer 3 is a device that identifies an object ID signal based on a signal received by the antenna A, and outputs the identified object ID signal to the position information determination device 1.

  The signal selector unit 2 is a changeover switch that selectively connects an arbitrary antenna to the reader / writer 3 among the multiple antennas A11 to A14, A21 to 24, A31 to 34, and A41 to 44. The signal selector unit 2 outputs an antenna ID signal that identifies the currently connected antenna to the reader / writer 3, and the reader / writer 3 sends the object ID signal together with the antenna ID signal to the position information determination device 1. Output to. Note that the signal selector unit 2 according to the present embodiment performs antenna selection based on a control signal input from the position information determination apparatus 1.

  The position information determination device 1 controls the selection of the antenna in the signal selector unit 2 and acquires the object ID signal read by the reader / writer 3 and the antenna ID signal received from the object ID signal. An apparatus for determining the position of an object. The position information determination apparatus 1 includes a memory 1a as a displacement history storage unit that stores a displacement history of each object, obtains a displacement history stored in the memory 1a, and predicts a displacement of the object. The signal selector unit 2 is controlled so as to preferentially select the antenna around the predicted movement position of the object.

  Note that various methods are selected for the prediction of the object displacement by the position information determination apparatus 1 according to the type of sport. For example, in a sports scene in which a player moves around a ball, such as in a soccer game, first, the displacement of the ball is preferentially predicted from the acceleration and movement direction of the ball, and based on the predicted relative position to the ball Predict the position of the surrounding competitors. Further, in a sports scene where there is a pattern in the displacement of the ball, such as a baseball game, the movement of the ball or the player is predicted based on the pattern.

(Location information detection method)
By operating the position information detection system having the above configuration, the position information detection method of the present invention can be implemented. Here, the case where the position of the ball 6 existing on the soccer competition field 4 is detected will be described as an example. Note that “B” is given to the ball 6 as the object ID.

  That is, an object ID signal is transmitted from each of the objects 51 to 53 and 6, and the antenna is sequentially connected to the reader / writer 3 by the signal selector unit 2, and the antenna ID of the selected antenna is output to the reader / writer 3. As a result, the received signal received by the selected antenna and the antenna ID of the selected antenna are input to the reader / writer 3. Here, it is assumed that the ball 6 approaches the antenna A23, a signal is received from the ball 6 at the antenna A23, and "AID = 23" is input to the reader / writer 3 as the antenna ID.

  Next, the reader / writer 3 acquires the object ID based on the signal received by the antenna, and outputs the object ID and the antenna ID to the position information determination device 1. Here, it is assumed that “ID = B” is acquired as the object ID, and the antenna ID “AID = 23” is input to the position information determination apparatus 1 together with the object ID.

  The position information determination device 1 specifies whether the target is the player 51 to 53 or the ball 6 by the target ID, specifies the antenna that has received the target ID by the antenna ID, and determines which target It is determined in which position is. Here, it is determined that the ball 6 is present near the antenna A23.

  The determination result by the position information determination device 1 is stored in the memory 1a as a displacement history of each object. Then, in the next position determination, the position information determination apparatus 1 reads the displacement history stored in the memory 1a to predict the displacement of the object, and preferentially selects an antenna around the predicted movement position of the object. Thus, the signal selector unit 2 is controlled.

  For example, since ID = B was detected in the previous A23 in the displacement history, in the next position determination, when the predicted movement distance of ID = B is less than between the antennas, the surroundings of A23 are preferentially searched. If the predicted moving distance of ID = B exceeds the distance between the antennas, A33 is preferentially searched according to the moving direction and moving speed.

(Effects of position information detection system and position information detection method)
According to this embodiment, the signal selector unit 2 selectively connects a plurality of antennas A (A 11 to 14, A 21 to 24, A 31 to 34, A 41 to 44) to the reader / writer 3. Thus, it is possible to acquire the object ID signal in the whole area of the soccer competition field 4 by one leader writer 3, the installation cost of the leader writer 3 can be minimized, and the system construction cost is reduced. be able to.

  Further, in this embodiment, since the movement of the object is predicted and the antenna is selected by the signal selector unit 2, the location where the position determination is performed is dynamically changed, the search area is reduced, and unnecessary determination operation is performed. Can be reduced, and the scanning speed of the system can be improved.

(Modification 1)
In the above embodiment, the object ID signal is actively transmitted from the object and is received by the antenna A (A11-14, A21-24, A31-34, A41-44), but electromagnetic waves are transmitted from the antenna. It is good also as an electromagnetic wave induction system which outputs and receives the target object ID signal transmitted according to the output of this electromagnetic wave.

  More specifically, as shown in FIG. 3, instead of the antenna A (A11-14, A21-24, A31-34, A41-44), an electromagnetic induction coil antenna C (C11-14, C21-24). , C31-34, C41-44), and an electromagnetic induction type wireless IC tag is attached to the object. This wireless IC tag includes a coiled antenna and an IC chip.

  Then, a current is passed through the coil antenna C to generate a magnetic field, an induction current is generated in the antenna of the wireless IC tag by electromagnetic induction, the IC chip is driven by this current, and an object ID signal is transmitted from the wireless IC tag. This is received by the coil antenna C.

  In the soccer field 4, power lines P1 to P4 are wired in the X-axis direction, and signal lines S1 to S4 are wired in the Y-axis direction, forming a matrix as a whole. The power lines P1 to P4 and the signal lines Coil antenna C (C11-14, C21-24, C31-34, C41-44) is connected to each intersection with S1-S4. The power supply lines P1 to P4 and the signal lines S1 to S4 are sequentially selected by the signal selector unit 2, and power is supplied to each coil antenna C through the selected power supply line and is output from each coil antenna C through the signal line. The received signal is input to the reader / writer 3. A received signal from an arbitrary coil antenna C can be acquired by a combination of a power supply line and a signal line in the signal selector unit 2.

  According to such a position information detection system according to this modification, in order to connect a power line and a signal line to one coil antenna C, by appropriately selecting and combining the power line and the signal line, It is possible to control as many antennas as there are combinations of power supply lines and signal lines.

  In addition, by using the electromagnetic induction method, signal transmission from the wireless IC tag of the object can be performed by electromagnetic waves output from the coil antenna C. Therefore, no power source or the like is required on the wireless IC tag side. The tag structure can be simplified to reduce the weight, and the scope of application of the present invention can be expanded.

(Modification 2)
In the above embodiment, the antennas arranged on the matrix are individually driven sequentially, but, for example, as shown in FIG. 4, object identifier signals in areas A to D having different positions or areas are received. It is good also as an antenna to do. In this case, for example, the areas A to D are set by setting the reception range of each antenna to a range as shown in FIG. 4 or combining a plurality of antennas.

  Then, the position information determination device 1 determines the position of the object by appropriately changing the search order of the areas A to D by a logical operation based on the position or area of each receiving unit. For example, first, a search is performed for an area A having a wide range. If there is no object in the area A, the search is terminated at that time. If there is an object in the area A, a narrow search is performed for the areas B to D. I do. Areas B to D have the same area, but have different positions and shapes, and are partially overlapped, and narrow down the position of the object by calculating a logical product such as B × C ×. be able to. In addition, it is possible to determine the position at a higher speed by changing the operation order of the logical product according to the type and nature of the competition.

  According to such a position information detection system according to this modification, the number of antennas can be reduced, the efficiency of driving the antennas can be improved, and the operation speed of the entire system can be improved.

(Modification 3)
Further, in the control by the signal selector unit 2, the reception range and directivity of each antenna may be changeable. For example, as shown in FIG. 5, the detection area (reception range) of each antenna is changed to narrow down the position determination within the detection area of each antenna.

  Further, as shown in FIG. 6, each antenna is a directional antenna, and the antenna directivity is changed to the left direction L, the center M, and the right direction R in the detection area of each antenna, and further in the detection area of each antenna. Narrow down the position determination.

  According to such a position information detection system according to this modification, it is possible to improve the position specifying accuracy (resolution) of the object by changing the reception range and directivity of the antenna. Note that the accuracy of position determination can be further improved by combining the logical operation described in Modification 2 above with the change in the reception range and directivity.

It is a perspective view which shows the soccer competition field which concerns on embodiment. It is a block diagram which shows the structure of the positional information detection system provided in the soccer competition field which concerns on embodiment. It is a block diagram which shows the structure of the positional infomation detection system which concerns on the example 1 of a change. It is explanatory drawing which shows typically the antenna layout in the positional information detection system which concerns on the example 2 of a change. It is explanatory drawing which shows the receiving range of the antenna in the positional infomation detection system which concerns on the example 3 of a change. It is explanatory drawing which shows the directivity of the antenna in the positional infomation detection system which concerns on the example 3 of a change. It is explanatory drawing which shows typically the structure of the conventional positional information detection system.

Explanation of symbols

A11-14, A21-24, A31-34, A41-44 ... antenna, C11-14, C21-24, C31-34, C41-44 ... coil antenna, L11-14, L21-24, L31-34, L41 44, wiring, P1-P4, power line, S1-S4, signal line, 1 ... position information determination device, 1a ... memory, 2 ... signal selector, 3 ... leader writer, 4 ... soccer competition field, 51-53 , 6 ... Object (competitor, ball)

Claims (5)

A position information detection system for detecting the position of an object existing in a predetermined area,
A transmitting unit that is provided in the object and transmits an object identifier signal unique to the object;
A plurality of receivers arranged in the region and receiving the object identifier signal;
A reader unit for reading the object identifier signal;
A position information determination unit that acquires the object identifier signal read by the reader unit, identifies a reception unit that has received the object identifier signal, and determines the position of the object;
A displacement history storage unit that stores a displacement history of the object determined by the position information determination unit;
Among the multiple receiving units, the receiving unit around the movement position of the object predicted based on the displacement history stored in the displacement history storage unit is selected and connected to the reader unit, and the reader unit A position information detection system, comprising: a signal selector unit that performs reception control of the object identifier signal by changing a reception range of the reception unit connected to the receiver . The transmitter transmits the object identifier signal by an induced current caused by electromagnetic waves,
The receiving unit outputs an electromagnetic wave, receives the object identifier signal transmitted according to the output of the electromagnetic wave,
2. The position according to claim 1, wherein the signal selector unit selects an arbitrary receiving unit from among the plurality of receiving units, executes the output of the electromagnetic wave, and connects to the reader unit. Information detection system. The receiving unit receives the object identifier signal in a range of different positions or areas,
Position information detecting system according to claim 1 or claim 2 wherein the position information determining unit may determine the position of the object by a logical operation based on the position or area of the receiver.   The position information detection system according to claim 1, wherein the receiving unit is capable of changing a directivity based on control by the signal selector unit. A position information detection method for detecting the position of an object existing in a predetermined area,
An object-specific object identifier signal is transmitted from the object ;
Among the receiving units arranged in the area, the receiving unit connected to the reader unit receives the target identifier signal transmitted by the target,
By identifying the receiving unit that has received the object identifier signal, the position of the object is determined, and the displacement history of the object is stored in the displacement history storage unit,
Among the multiple receiving units, the receiving unit around the movement position of the object predicted based on the displacement history stored in the displacement history storage unit is selected and connected to the reader unit, and the reader unit The reception section of the object identifier signal is controlled by changing the reception range of the reception section connected to the receiver, thereby identifying the reception section that has received the object identifier signal and determining the position of the object thing
A position information detection method characterized by the above .

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