JP2008206776A - Clocking system for competition, radio equipment and time transmitting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clocking system or the like for a competition capable of appropriately clocking the individual competition times of athletes even in a situation where carrier sensing cannot be performed in a comparatively large-scale athletic meet. <P>SOLUTION: Taking the case of a communication period (one cycle) being divided into five time slots, as an example, nine kinds of communication patterns as shown in (a) are specified. If carrying out communication using such communication patterns, even when second and third communications collide (× marks in the figure) as shown in (b), a first communication does not collides. When radio tags with the same communication pattern communicate shifted by one cycle at a time, a collision can be avoided as shown in (c). In shifting one cycle at a time to carry out communication, even if each radio tag communicates in such a communication pattern that its second communication collide with the first communication of the other radio tag, not all the communications collide as shown in (d). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a competition timing system, a wireless device, and a time transmission method capable of appropriately measuring a competition time of each individual athlete even in a situation where carrier sense cannot be performed in a relatively large competition.

In recent years, in competitions such as marathon competitions, attempts have been made to measure (measure) the goal times of individual athletes. For example, a measurement system that measures a competitor's individual goal time based on the time when a barcode was printed on a competitor's race bib and the reader's barcode was read by a reader has been put into practical use. Yes.
Recently, in order to be able to measure the competition time including the passing time at each timing point, an attempt has been made to measure the competition time of each athlete without contact. For example, a measurement system for measuring a competition time has been developed based on information sent from the tag transmitter by allowing a player to hold a tag transmitter, and an operation test for practical use has been attempted.

More specifically, a trigger signal is transmitted from a square loop coil or the like into the measurement area on the competition track, and when the athlete holding the tag transmitter travels within the measurement area, In response, an ID (such as an identification number) is transmitted from the tag transmitter. And ID receiving unit receives this ID, and measures the number of laps of each athlete, competition time, etc. (for example, refer to patent documents 1).
In addition to this, a technique is also disclosed in which the tag transmitter transmits an ID using weak radio waves in the UHF band, etc., so as to increase the communication distance of the tag transmitter (see, for example, Patent Document 2).
JP 2003-141497 A (page 2-4, FIG. 2) JP 2004-125765 A (page 3-4, FIG. 2)

In the techniques of Patent Documents 1 and 2 described above, the tag transmitter continues to transmit the ID without interruption while receiving the trigger signal in the timing area (Patent Document 2 at random intervals). Repeated transmission).
This is because a trigger signal is transmitted by a square loop coil, and it is extremely difficult to detect an accurate trigger point (for example, a time line such as a goal line) in the time measuring area with a tag transmitter. Due to For this reason, the tag transmitter starts transmitting ID as soon as the competitor enters the timing area and detects the trigger signal, and continues to transmit the ID until it exits the timing area and finishes detecting the trigger signal.
On the other hand, when receiving the ID for the first time, the ID receiving unit sets the time as the start time, and when receiving the ID, sets the time as the end time. And the competition time of the player corresponding to this ID was time-measured by calculating | requiring the intermediate | middle time from a start time to an end time.

However, in the techniques of Patent Documents 1 and 2, when a large number of athletes arrive in the timing area at the same time, the ID receiving unit side may not receive the ID that should be transmitted appropriately. This is because a situation in which the processing on the ID receiving unit side cannot catch up due to a plurality of tag transmitters continuously transmitting IDs to each other in the timing area, or a collision occurs when each ID is transmitted. Because.
For this reason, the start time and end time cannot be obtained correctly in the ID receiving unit, and the inaccurate competition time is timed, or the competition time to be timed is almost lost without receiving the ID. There was a problem.
In the technique disclosed in Patent Document 2, the tag transmitter transmits IDs at random intervals to suppress the occurrence of collision. In reality, however, a collision occurred while each tag transmitter repeatedly transmitted an ID within the timing area.
Therefore, in order to suppress the occurrence of such a collision, it may be possible to cause each tag transmitter to perform carrier sense for detecting whether another tag transmitter is transmitting before transmission.

However, since the tag transmitter is attached so as to be in contact with the athlete (human body), the communication capability of the tag transmitter may be significantly reduced depending on the shape and type of the antenna. Further, during the competition, since a player or the like may enter between the tag transmitter and another tag transmitter, the communication capability of the tag transmitter is significantly reduced in this case.
In these cases, each tag transmitter cannot properly perform carrier sense, and even if other tag transmitters are transmitting, it is determined that they are not transmitting and transmission starts. Will cause a collision.
Therefore, there has been a demand for a technique for suppressing the occurrence of collision even in a situation where carrier sense cannot be performed.

  The present invention was made in view of the above circumstances, and in a relatively large competition, a competition timing system capable of appropriately measuring the competition time of each athlete even in a situation where carrier sense cannot be performed, It is an object to provide a wireless device and a time transmission method.

In order to achieve the above object, a timing system for competition according to the first aspect of the present invention is:
A competition timing system including a plurality of wireless devices carried by each athlete, and a receiving device that receives information transmitted from each wireless device,
Each wireless device includes
Pattern information storage means for storing pattern information defining any time slot used for communication among a plurality of time slots divided into communication periods;
A time measuring means for measuring the reference time in the competition;
Detection means for detecting a trigger point based on an increase or decrease in the electromagnetic field intensity of the electromagnetic field generated on the runway;
When the trigger point is detected by the detection means, measurement means for measuring the time measured by the time measurement means as a competition time;
Wireless communication for transmitting time information including the competition time measured by the measuring means to the receiving device in a time slot defined by the pattern information stored in the pattern information storage means in the communication period Means are provided,
The receiving device includes
Receiving means for receiving the time information transmitted in each time slot from the wireless communication means of each wireless device is provided,
It is characterized by that.

  According to the present invention, in each wireless device, the pattern information storage means stores pattern information that defines any time slot used for communication among a plurality of time slots divided into communication periods. The time measuring means measures a reference time (for example, running time) in the competition. The detecting means detects the trigger point based on the increase or decrease of the electromagnetic field intensity of the electromagnetic field generated on the runway. The measuring means measures the time measured by the time measuring means as the competition time when the trigger point is detected. The wireless communication means transmits time information including the competition time measured by the measurement means to the receiving side device in a time slot defined by the pattern information stored in the pattern information storage means during the communication period. On the other hand, in the receiving device, the receiving unit receives time information transmitted in each time slot from the wireless communication unit of each wireless device.

In this way, each wireless device transmits time information in a time slot corresponding to the pattern information. Therefore, the receiving device can receive time information transmitted from a plurality of wireless devices without overlapping time slots.
As a result, it is possible to appropriately time the competition time of each competitor even in a situation where career sense cannot be performed in a relatively large competition.

The pattern information storage means stores pattern information defining each time slot used in the communication period of a plurality of times,
The wireless communication unit may transmit the time information in each time slot defined in the pattern information.
In this case, since time information is transmitted a plurality of times, even if some communications collide due to overlapping time slots, the remaining communications can be transmitted without causing a collision.

The pattern information is
A time slot that does not overlap the time slot defined in the pattern information of the other wireless device;
You may make it prescribe | regulate the time slot which overlaps with the said time slot prescribed | regulated in the said pattern information of the other said radio | wireless apparatus.
In this case, when there is no shift in the communication period or time slot, communication is secured by a time slot that does not overlap with the time slot of another wireless device, and when there is a shift in the communication period or time slot, the other time slot is appropriately set. Communication without collision is ensured by shifting.

Each wireless device is grouped in advance into a plurality of groups,
The wireless communication means transmits the time information using a different communication channel for each group,
The reception unit may receive the time information transmitted from the wireless communication unit of each wireless device using each communication channel.
In this case, since communication collision does not occur if the communication channel is different, even if more wireless devices transmit at the same time, the receiving device can receive.

  The receiving unit may receive the time information transmitted in a time slot in which no collision has occurred in communication between the wireless devices.

In order to achieve the above object, a wireless device according to the second aspect of the present invention provides:
A wireless device that is carried by each competitor and transmits information to the receiving device,
Pattern information storage means for storing pattern information defining any time slot used for communication among a plurality of time slots divided into communication periods;
A time measuring means for measuring the reference time in the competition;
Detection means for detecting a trigger point based on an increase or decrease in the electromagnetic field intensity of the electromagnetic field generated on the runway;
When the trigger point is detected by the detecting means, measuring means for measuring the time counted by the time measuring means as a competition time;
Wireless communication for transmitting time information including the competition time measured by the measuring means to the receiving device in a time slot defined by the pattern information stored in the pattern information storage means in the communication period Means,
It is characterized by providing.

  According to this invention, the pattern information storage means stores pattern information that defines any time slot used for communication among a plurality of time slots divided into communication periods. The time measuring means measures a reference time (for example, running time) in the competition. The detecting means detects the trigger point based on the increase or decrease of the electromagnetic field intensity of the electromagnetic field generated on the runway. The measuring means measures the time measured by the time measuring means as the competition time when the trigger point is detected. Then, the wireless communication means transmits time information including the competition time measured by the measurement means to the receiving side device in a time slot defined by the pattern information stored in the pattern information storage means during the communication period. .

In this way, each wireless device transmits time information in a time slot corresponding to the pattern information. Therefore, the receiving device can receive time information transmitted from a plurality of wireless devices without overlapping time slots.
As a result, it is possible to appropriately time the competition time of each competitor even in a situation where career sense cannot be performed in a relatively large competition.

In order to achieve the above object, a time transmission method according to a third aspect of the present invention includes:
A time transmission method in a competition timing system including a plurality of wireless devices carried by each athlete, and a receiving device that receives information transmitted from each wireless device,
Each wireless device stores pattern information that defines any time slot used for communication among a plurality of time slots divided into communication periods.
In each of the wireless devices, a time measuring step for measuring a reference time in the competition;
In each of the wireless devices, a detection step of detecting a trigger point based on the increase or decrease of the electromagnetic field intensity of the electromagnetic field generated on the runway;
In each wireless device, when the trigger point is detected in the detection step, a measurement step of measuring the time measured in the time measurement step as a competition time;
In each of the wireless devices, a wireless communication step of transmitting time information including the competition time measured in the measuring step to the receiving device in a time slot defined by the pattern information in the communication period; ,
In the receiving device, each receiving step of receiving the time information transmitted in each time slot by the wireless communication step of each wireless device;
It is characterized by providing.

  According to the present invention, in each wireless device, the time measuring step measures the reference time (for example, running time) in the competition. Moreover, a detection step detects a trigger point based on the increase / decrease in the electromagnetic field intensity of the electromagnetic field produced | generated on the runway. In the measurement step, when the trigger point is detected, the time measured in the time measurement step is measured as the competition time. In the wireless communication step, time information including the competition time measured in the measurement step is transmitted to the receiving device in a time slot defined in the pattern information in the communication period. In the receiving device, the receiving step receives time information transmitted in each time slot from the wireless communication means of each wireless device.

In this way, each wireless device transmits time information in a time slot corresponding to the pattern information. Therefore, the receiving device can receive time information transmitted from a plurality of wireless devices without overlapping time slots.
As a result, it is possible to appropriately time the competition time of each competitor even in a situation where career sense cannot be performed in a relatively large competition.

  According to the present invention, it is possible to appropriately time the competition time of each athlete even in a situation where career sense cannot be performed in a relatively large competition.

  A game timing system according to an embodiment of the present invention will be described below with reference to the drawings. As an example, a description will be given of a timing system for competition that is applied to a relatively large-scale marathon competition and measures the competition time of each athlete.

(Embodiment 1)
FIG. 1 is a schematic diagram showing an example of a configuration of a game timing system applied to the embodiment of the present invention. In the following description, the relay points and goal points for time measurement will be collectively described as time points for convenience. That is, the timekeeping points in the figure indicate relay points and goal points.

  As shown in the figure, the competition timing system includes a timer device 10 installed at the start point and the timing point, a modulation magnetic field generator 20 installed at the timing point, a loop coil 21, a magnetic field generator 30, a loop coil 31, The transmission control box 40, the transmitter 41, the time synchronization console 50, the reception control box 60, the receiver 61, the processing device 70, and the wireless tag 80 that is carried by each competitor RN, respectively. .

The timer device 10 is arranged at each of the start point and the time point, and measures the running time that is the reference time in the competition. As an example, each timer device 10 counts down to the scheduled start time of the competition, and counts up the running time from the scheduled start time.
The timer device 10 disposed at the start point is connected to the start pistol SP, and a start signal is supplied from the start pistol SP together with a signal for starting the competition. The timer device 10 obtains the time difference between the actual start time and the running time, that is, the difference.
This difference is input to the timer device 10 arranged at the time point, and the running time synchronized with the time difference being eliminated is also counted at the time point.

The modulated magnetic field generator 20 at the timing point is disposed, for example, along the roadside and generates an electromagnetic field on the loop coil 21. Specifically, the modulation magnetic field generator 20 modulates a sine wave generation circuit that generates a sine wave synchronized with a predetermined frequency, and a modulation circuit that modulates the sine wave in a predetermined manner according to a barrier number (unique identification information). And a power amplifier circuit that amplifies the received signal (modulated signal) and supplies the amplified signal to the loop coil 21.
In the modulated magnetic field generator 20, different barrier numbers are set according to the time points.

The loop coil 21 is a coil formed in a substantially square shape, and is appropriately arranged on the runway on which the player RN runs. In addition, the loop coil 21 is arrange | positioned on the runway before the loop coil 31 (time-measurement point).
As an example, as shown in FIG. 2A, the loop coil 21 is predetermined in parallel with a straight line b extending in a direction perpendicular to the running direction of the player RN (the direction of arrow A in the figure) as a center line. It is formed in a substantially square (rectangular) shape along the straight lines a and c separated by a distance. And it forms so that it may have the feeding point s on one side, and a current flows from this feeding point s in the direction of the arrow.
When a modulation signal is supplied from the modulation magnetic field generator 20 through the feeding point s, the loop coil 21 generates a modulated AC electromagnetic field on the coil. Specifically, an electromagnetic field as shown in FIG. 2B is generated. For example, a barrier number modulated by an amplitude modulation method such as OOK (On-Off-Keying) is superimposed on the electromagnetic field.
When the wireless tag 80 detects such a modulated electromagnetic field, the wireless tag 80 shifts to an operation mode (time synchronization mode) as described later and receives time distribution from the transmitter 41 to perform time synchronization.

  Returning to FIG. 1, the magnetic field generator 30 is disposed along the road, for example, and generates an electromagnetic field on the loop coil 31. Specifically, the magnetic field generation device 30 includes a sine wave generation circuit that generates a sine wave synchronized with a predetermined frequency, and a power amplification circuit that amplifies the generated sine wave and supplies the sine wave to the loop coil 31. .

The loop coil 31 is a coil formed in a substantially “eight-figure” shape, and is appropriately arranged at a timing point on the runway.
As an example, as shown in FIG. 3A, the loop coil 31 is formed in a figure 8 such that two rectangular (rectangular) coil portions are connected in the running direction of the player RN (the direction of arrow A). ing. More specifically, the loop coil 31 is wound in the forward direction of the figure 8, and is formed so as to have a feeding point s at the center (middle point) of the figure 8, that is, at the intersection, and passes through the feeding point s. The upper and lower portions of the figure 8 are formed along the straight lines a and c that are separated from each other by a predetermined distance substantially in parallel with the straight line b extending in the direction orthogonal to the running direction of the player RN. The loop coil 31 is arranged so that the straight line b overlaps the time line L shown in FIG.

The loop coil 31 is configured such that a current flows in the direction of the arrow from the feeding point s in FIG. 3A. When a sine wave is supplied from the magnetic field generator 30, an alternating electromagnetic field is generated on the coil. . Specifically, as shown in FIG. 3 (b), the first electromagnetic field 310a is generated on one coil part, and the player RN runs against the first electromagnetic field 310a on the other coil part. A second electromagnetic field 310b adjacent to the direction (the direction of arrow A) and canceling the electromagnetic force with the first electromagnetic field 310a is generated.
That is, the electromagnetic field strength of the electromagnetic field on the straight line b is extremely smaller than the electromagnetic field strengths on both sides of the first electromagnetic field 310a and the second electromagnetic field 310b due to the cancellation of the magnetic force of the electromagnetic field (for example, the electromagnetic field). The field strength is “0”).

In the electromagnetic field as shown in FIG. 3B, the electromagnetic field detection direction (direction perpendicular to the detection coil surface D) is perpendicular to the travel path (that is, the detection coil surface D is parallel to the travel path). When the electromagnetic field detection coil C (LF antenna 81 of the wireless tag 80 described later) moves in the direction of arrow B, an electromagnetic field intensity distribution as shown in FIG. That is, the electromagnetic field detection coil C captures the magnetic flux in the direction perpendicular to the running path at the detection coil surface D, and therefore the electromagnetic field strength is extremely small (for example, the electromagnetic field strength is “0”). An electromagnetic field intensity distribution as shown in 3 (c) is detected.
For this reason, when the player RN passes over the loop coil 31 along the direction of the arrow B, the wireless tag 80 has the first electromagnetic field 310a and the second electromagnetic field on the timing line L (on the straight line b). It can be detected as an inflection point (trigger point described later) of the electromagnetic field between 310b.

  Returning to FIG. 1, the transmission control box 40 is connected to the timer device 10, and transmits the running time to the wireless tag 80 of the player RN who has moved to the vicinity via the transmitter 41. That is, time distribution is performed on the above-described loop coil 21 toward the wireless tag 80 that has shifted to the time synchronization mode.

The transmitter 41 is controlled by the transmission control box 40 and transmits time information for synchronization. That is, time distribution is performed toward the wireless tag 80.
For example, the transmitter 41 transmits time information including the hour, minute, and second (HH: MM: SS) of the running time.
Upon receiving this time information, the wireless tag 80 sets the running time in the timekeeping unit, and starts measuring the accurate running time synchronized with the timer device 10.

  The time synchronization console 50 is a console terminal that controls the transmission control box 40 and displays the operation status of the transmission control box 40, and is appropriately used for control and monitoring by the competition officials and the like.

The reception control box 60 receives time information transmitted from the wireless tag 80 by wireless communication via the receiver 61. That is, the time information transmitted over multiple times is received from the wireless tag 80 of the player RN that has passed through the timing line L on the loop coil 31 described above.
As will be described later, the wireless tags 80 are grouped into a predetermined number, and different communication channels (radio frequencies) are used depending on the group. Further, in each communication channel, the communication period is divided into a predetermined number of slots (time slots), and the wireless tag 80 transmits time information in the predetermined time slot according to a communication pattern described later. For example, the wireless tag 80 transmits time information by specifying each time slot with the starting point of the communication period as the timing when the running time measured by its own timekeeping unit, which will be described later, becomes a second (n second 000). .
Therefore, the reception control box 60 can receive each communication channel via the receiver 61, and is synchronized with the running time (for example, a value of seconds or less) counted by the timer device 10 in each time slot. In this way, time information that can be transmitted from a large number of wireless tags 80 at the same time can be acquired without any omission.

The receiver 61 is disposed in the vicinity of the loop coil 31 and the like, and receives time information sent from the wireless tag 80.
For example, the receiver 61 can receive communications of each communication channel and is controlled by the reception control box 60 to receive time information that can be transmitted in each time slot. Then, the received time information is supplied to the reception control box 60.

  The processing device 70 collects the competition time and the like of each competitor RN. For example, the competition time received by the reception control box 60 and the tag ID (the tag ID of the wireless tag 80 described later) are sequentially associated and accumulated.

On the other hand, the wireless tag 80 carried (held) by the athlete RN moves on the runway with the athlete RN at the start of the competition, and passes through a timing point (such as a relay point) on the way from the starting point to the last. Reach the time point (goal point).
At each timing point, the wireless tag 80 detects the modulated electromagnetic field generated on the loop coil 21 and shifts to the time synchronization mode, and detects the inflection point of the electromagnetic field generated on the loop coil 31. Then, the competition time is specified from the time (running time) at that time. When the wireless tag 80 generates time information including the competition time, the wireless tag 80 uses its own communication channel and transmits the time information in the assigned time slot a plurality of times according to its own communication pattern.

  For example, as shown in FIG. 4, the wireless tag 80 includes an LF antenna 81, an amplifier circuit 82, a detection circuit 83, a control unit 84, a timer unit 85, a storage unit 86, a communication circuit 87, And a wireless antenna 88.

An LF (Low Frequency) antenna 81 detects an electromagnetic field generated from the loop coil 21 and the loop coil 31 described above. That is, an electromagnetic field (with modulation) generated on the loop coil 21 by the modulated magnetic field generator 20 or an electromagnetic field (without modulation) generated on the loop coil 31 by the magnetic field generator 30 is detected.
The LF antenna 81 supplies a detection signal indicating the detected electromagnetic field intensity to the amplifier circuit 82.

  The amplification circuit 82 appropriately amplifies the detection signal supplied from the LF antenna 81 and supplies the amplified detection signal to the detection circuit 83.

The detection circuit 83 detects the arrival on the loop coils 21 and 31 according to the detection signal supplied from the amplification circuit 82, and further detects the inflection point of the electromagnetic field on the loop coil 31.
For example, on the loop coil 21, as shown in FIG. 5A, the detection circuit 83 sets the detection output to “HI” when the electromagnetic field strength of the electromagnetic field becomes equal to or higher than the threshold value, and detects when the electromagnetic field strength becomes lower than the threshold value. The output is “LO”. The detection circuit 83 can also detect the presence or absence of modulation, and can detect that the player RN (wireless tag 80) has reached the loop coil 21 by detecting the modulation.
On the other hand, on the loop coil 31, as shown in FIG. 5B, the detection circuit 83 sets the detection output to “HI” when the electromagnetic field intensity of the first electromagnetic field 310a and the second electromagnetic field 310b is equal to or higher than the threshold value. To do. At this time, since the electromagnetic field on the loop coil 31 is not modulated, the state of “HI” at the first time continues for a predetermined period or longer, and the detection circuit 83 detects that there is no modulation. That is, the detection circuit 83 detects that the player RN has reached the loop coil 31 because there is no modulation in the electromagnetic field.
When the electromagnetic field intensity falls below the threshold between the first electromagnetic field 310a and the second electromagnetic field 310b, the detection circuit 83 sets the detection output to “LO”, and then detects the second electromagnetic field 310b. The state of “HI” for the second time is detected as an inflection point of the electromagnetic field. That is, the detection circuit 83 specifies the state of “HI” in the second time shown in FIG. 5B as the trigger point on the loop coil 31.

Returning to FIG. 4, the control unit 84 controls the entire wireless tag 80.
For example, when the predetermined operation confirmation is finished before the start of the competition, the control unit 84 shifts to a sleep mode (power saving mode) in which power consumption is suppressed. Thereafter, the competition is started, and when the player RN reaches the loop coil 21 at the timing point, the control unit 84 shifts from the sleep mode to the operation mode (time synchronization mode). When the distributed time information (for example, running time hour, minute, second, etc.) is received by the communication circuit 87, this time information is set in the time measuring unit 85 and the running time is counted.
Moreover, the control part 84 specifies the time (running time) which the time measuring part 85 measures as a competition time at the timing when the detection circuit 83 detected the inflection point of the electromagnetic field on the loop coil 31. That is, the competition time is measured on the timing line L described above. And the control part 84 transmits the time information containing the measured competition time using the own communication channel in the assigned time slot several times according to its own communication pattern.
Hereinafter, transmission of such time information will be described more specifically with reference to FIGS.

In this timing system, a predetermined number of communication channels can be used so that a large number of wireless communications can be performed at the same time. Further, in each communication channel, a reference communication period is set to a predetermined number of time slots. It is divided.
For example, the wireless tags 80 are grouped in advance, and communication can be performed using a different communication channel for each group. That is, the wireless tags 80 of different groups do not collide with each other because the communication channels to be used are different.
Further, in each communication channel, for example, a communication period for one cycle (for example, 1 second) is divided into a predetermined number of time slots so that time division communication can be performed. That is, even if the wireless tags 80 in the same group are different in time slot, no collision occurs even if communication is performed within the same cycle.
Hereinafter, the description will be given focusing on the same communication channel (the wireless tags 80 in the same group).

In the same communication channel, for example, as shown in FIG. 6A, the communication period (one cycle) is divided into five time slots. In this case, if communication is performed in different time slots, a maximum of five wireless tags 80 can perform communication at the same time (in a time division manner).
As an example, if one cycle is 1 second, each time slot has an upper limit of 200 milliseconds. Therefore, the wireless tag 80 needs to finish communication within the range of 200 milliseconds.
More specifically, as in communication B in FIG. 6B, control is performed so that actual communication is performed in the center of the time slot for less than 200 milliseconds. And even if the timings of communication A and communication C in adjacent time slots are slightly shifted (even if they are delayed or advanced), the communication is finished in a time that does not overlap, in other words, does not collide. ing.
In order to facilitate understanding of the description, as shown in FIG. 6C, each time slot with which each wireless tag 80 communicates is expressed in a matrix and described. In this matrix, five types of communication patterns (patterns A to E) are shown.

Generally, when performing wireless communication, a communication error may occur, and 100% reliable communication cannot be guaranteed. Therefore, it is necessary to perform communication from the wireless tag 80 a plurality of times.
For example, as shown in FIG. 7A, communication is performed three times with one communication pattern. Nevertheless, as shown in FIG. 7B, when the wireless tags 80 having the same communication pattern are communicated with a shift of one cycle at a time, the time slots in the cycle overlap each other, and all communications collide. It can happen.
For this reason, as shown in FIG. 8A, the communication may be performed by using a communication pattern that is different for each cycle (the time slot position in the cycle is different depending on the cycle). Further, in each communication pattern shown in FIG. 8A, each time slot is defined so as not to overlap with a time slot defined in the communication pattern of another wireless tag 80.

  When communication using a different communication pattern for each cycle is performed, as shown in FIG. 8B, the wireless tags 80 having the same three-cycle communication pattern (as an example, the pattern A-D-C). However, even if communication is performed with a shift of one cycle at a time, since the time slots in the cycles do not overlap, there is no communication collision. On the other hand, as shown in FIG. 8C, the wireless tags 80 whose three-cycle communication patterns do not match (for example, the pattern A-D-C, the pattern D-B-A, and the pattern B-E-D). When communication is performed with a shift of one cycle at a time, the time slots in the cycle may overlap (marked with x in the figure). Even so, overlap is limited to some time slots, and it is less likely that all three time slots overlap.

As described above, each wireless tag 80 communicates a plurality of times so that it can cope with a communication error, but the number of time slots that are occupied (used for communication) as the number of communication increases. Will increase accordingly.
Specifically, if 1 cycle is 5 time slots and the number of communication is 3 times, as shown in FIG. 9A, 3 times per cycle (1st time, 2nd time, 3rd time respectively) It is possible that the communication periods overlap. In this case, a maximum of five wireless tags 80 can communicate at the same time in three overlapping communication periods.
However, in each wireless tag 80, the number of tags that can be processed increases probabilistically if it is sufficient that two or one communication can be performed without collision among the three communication opportunities.
For example, as shown in FIG. 9B, five types of three-cycle communication patterns (pattern A-D-C, pattern B-E-D, pattern C-A-E, pattern D-B-A, pattern E-C-B), and when communication is performed with a shift of one cycle at a time, the three communication periods may overlap in 25 ways surrounded by a dotted line. Since there are three types of communication in the same time slot, if at least eight (25/3 = 8.33) wireless tags 80 per cycle, at least one communication can be normally performed. The possibility is high.

  The control unit 84 appropriately controls such three times of communication (time information transmission). When the third communication is completed, the control unit 84 shifts from the operation mode to the sleep mode again. That is, power consumption is suppressed as much as possible until the competitor RN arrives at the next timing point.

Returning to FIG. 4, the time measuring unit 85 measures the time synchronized with the running time based on the time information received by the communication circuit 87.
Note that the time measuring unit 85 includes a highly stable crystal oscillator, and is capable of maintaining the time measurement after synchronization to a certain degree of stability.

The storage unit 86 includes, for example, a non-volatile memory and stores information necessary for transmission of time information.
Specifically, the storage unit 86 of each wireless tag 80 stores pattern information that defines a communication pattern. For example, a communication pattern associated with itself among five types of communication patterns (communication patterns for three cycles) as shown in FIG. 9B is stored.
Furthermore, the storage unit 86 stores in advance a tag ID (unique identification information) that differs for each wireless tag 80 (for each player RN). The tag ID is used for grouping the wireless tags 80, that is, for assigning channels used for communication.

The communication circuit 87 receives time information transmitted from the transmitter 41 described above via a predetermined communication antenna.
The communication circuit 87 is controlled by the control unit 84, uses its own communication channel, and transmits time information to the receiver 61 in the assigned time slot over a plurality of times according to its own communication pattern. To do.

  The wireless antenna 88 is an antenna used for wireless communication, and emits time information transmitted by the communication circuit 87 superimposed on radio waves of a predetermined frequency (a communication channel of a group to which the wireless tag 80 belongs).

Hereinafter, the operation of the game timing system having the above-described configuration will be described with reference to FIG. FIG. 10 is a flowchart for explaining the time transmission process executed by the wireless tag 80 and the time reception process executed by the reception control box 60.
This time transmission process and time reception process are repeatedly executed during the competition. It is assumed that the wireless tag 80 has shifted to the sleep mode in which power consumption is suppressed while the player RN reaches the timing point.

First, the wireless tag 80 waits until it detects an electromagnetic field with modulation (step S11). That is, until the detection circuit 83 detects the modulated electromagnetic field on the loop coil 21, it waits for the subsequent processing to be performed.
Eventually, when the player RN reaches the loop coil 21 and detects the modulated electromagnetic field, the wireless tag 80 shifts from the sleep mode to the operation mode (time synchronization mode).

  The wireless tag 80 that has shifted to the operation mode receives the distributed time information, and sets the running time in the time measuring unit 85 (step S12). That is, when the communication circuit 87 receives time information sent from the transmission control box 40 (transmitter 41), the control unit 84 causes the time measuring unit 85 to measure the running time according to the time information.

When the setting of the running time is completed, the wireless tag 80 waits until it detects an electromagnetic field without modulation (step S13). That is, until the detection circuit 83 detects an unmodulated electromagnetic field on the loop coil 31, execution of the subsequent process is waited.
Eventually, when the athlete RN reaches the loop coil 31, the wireless tag 80 detects an electromagnetic field without modulation.

  The wireless tag 80 detects the trigger point from the electromagnetic field and specifies the competition time (step S14). That is, when the detection circuit 83 detects the inflection point of the electromagnetic field on the loop coil 31, the control unit 84 measures the time measured by the time measuring unit 85 at that time as the competition time.

  After the competition time is measured, the wireless tag 80 sets an initial value 1 to a variable n for counting the number of communications, and reads a communication pattern (step S15). Note that the wireless tag 80 is assigned with a channel to be used for communication according to the value of the tag ID, for example.

The wireless tag 80 uses the timing at which the running time counted by its own time measuring unit 85 becomes a second (n second 000) as a communication period, that is, the start of one cycle, and sets the time slot of the nth communication as a communication pattern. (Step S16). That is, the control unit 84 specifies the time slot used in the n-th communication according to the communication pattern.
For example, when the communication pattern is “pattern A-D-C” as shown in FIG. 11, “slot 1” is specified in the first communication, and “slot 4” is specified in the second communication. In the third communication, “slot 3” is specified.

  The wireless tag 80 waits until a time slot arrives (step S17). That is, it waits until the time slot specified in step S16 arrives based on the value of seconds or less of the running time counted by the clock unit 85.

  When the specified time slot arrives, the wireless tag 80 transmits n-th time information (step S18). The communication circuit 87 transmits time information using the communication channel of the group to which the wireless tag 80 belongs.

  The wireless tag 80 adds 1 to the variable n (step S19). Then, the wireless tag 80 determines whether or not the variable n after addition is larger than 3 (step S20). That is, it is determined whether or not the transmission of time information for three times has been completed.

If the wireless tag 80 determines that it is (3 or less), it returns the process to step S16 and repeats the processes of steps S16 to S20 described above.
On the other hand, when it is determined that the variable n is larger than 3, the wireless tag 80 finishes the time transmission process and shifts to the sleep mode.

Next, the time reception process will be described.
The reception control box 60 waits for time information sent from the wireless tag 80 via the receiver 61 (step S21). That is, the execution of the subsequent process is waited until the time information sent in step S18 of the time transmission process described above is received.
Note that time information may be transmitted from many wireless tags 80 at the same time, and when time information is transmitted in the same time slot, communication collides (in the case of the same communication channel). ).
Therefore, the reception control box 60 receives time information transmitted without overlapping time slots (in the case of the same communication channel).

  Then, the reception control box 60 combines the competition time and the tag ID included in the time information and supplies them to the processing device 70 (step S22).

Through such time transmission processing and time reception processing, each wireless tag 80 transmits time information in the assigned time slot according to its own communication pattern. Therefore, time-division communication is possible, and a plurality of wireless tags 80 can transmit time information at the same time. Since each wireless tag 80 transmits time information over a plurality of times, even if some communications collide due to overlapping time slots, the remaining communications can be transmitted without causing a collision. Become.
As a result, it is possible to appropriately time the competition time of each competitor even in a situation where career sense cannot be performed in a relatively large competition.

In the above-described time transmission process, the case where each wireless tag 80 transmits time information in any time slot in each cycle in units of cycles has been described. However, taking the cycle more flexibly, for example, not all wireless tags 80 communicate every cycle, and some wireless tags 80 communicate multiple times within a period of multiple cycles. You may make it perform.
Hereinafter, transmission of time information for performing communication a plurality of times within a plurality of cycles will be described more specifically with reference to FIGS. In the same manner as described above, the same communication channel (the wireless tags 80 in the same group) will be noted and described.

Similarly to the above, if the communication period (one cycle) is divided into five time slots as an example, nine types of communication patterns as shown in FIG. 12A are defined. Further, in each communication pattern shown in FIG. 12A, at least one time slot that does not overlap with the time slot defined in the communication pattern of the other wireless tag 80 is defined. Overlapping slots are allowed.
When communication using such a communication pattern is performed, as shown in FIG. 12B, even if the second and third communications collide (indicated by a cross in the figure), the first communication does not collide. .
Further, when the wireless tags 80 having the same communication pattern communicate with each other by shifting by one cycle, as shown in FIG. 12C, a collision can be avoided.
Further, even when each wireless tag 80 performs communication in a communication pattern in which the second time of itself and the first time of another wireless tag 80 collide when communicating with a shift of one cycle at a time, FIG. As shown in (d), all communications do not collide.

That is, in the same way as described above, in each wireless tag 80, the number of tags that can be processed will increase probabilistically as long as two or one communication can be performed without collision among the three communication opportunities. become.
For example, as shown in FIG. 13, when nine types of communication patterns are used and communication is performed with a shift of one cycle at a time, the three communication periods may overlap in 45 ways surrounded by a dotted line. Since communication is performed in the same time slot in five ways (1 part and 7 ways), if nine (45/5 = 9) wireless tags 80 per cycle, at least one communication is performed. There is a high possibility that this can be performed normally.

Also in this case, each wireless tag 80 transmits time information in the assigned time slot according to its own communication pattern. Therefore, time-division communication is possible, and a plurality of wireless tags 80 can transmit time information at the same time. Since each wireless tag 80 transmits time information over a plurality of times, even if some communications collide due to overlapping time slots, the remaining communications can be transmitted without causing a collision. Become.
As a result, it is possible to appropriately time the competition time of each competitor even in a situation where career sense cannot be performed in a relatively large competition.

(Other embodiments)
In the above embodiment, the case where the communication period (one cycle) is divided into five time slots has been described. However, the number of time slots is not limited to this, and can be changed as appropriate according to the scale of the competition (the number of competitors participating). Also, the number of communication channels and the type of communication pattern can be changed as appropriate.
This will be specifically described below.

The number of wireless tags 80 used varies greatly depending on the scale of the competition, but the course width used for the competition is limited.
For example, if there are 100 competitors to participate, and 10 communication channels are used, 10 independent communication patterns per channel are sufficient.
Further, if one cycle is divided into 10 time slots, 100 types of communication patterns are created and communication does not collide. At that time, even if communication is performed a plurality of times with the same communication pattern, there is no collision.

Still, it will be insufficient when a larger number of competitors participate. Even if the number of competitors increases, the maximum number of wireless tags 80 to be measured (communication is performed) can be obtained at the same time due to restrictions on the width and speed of the course.
Specifically, when the course width of the competition (for example, the course width of the stadium) is 10 m, one player enters an area of 50 cm × 50 cm, and the speed is 5 m / sec, 1 second (1 The number of wireless tags 80 processed in a cycle is about 200 (10 / 0.5 × 5 / 0.5 = 200).
For this reason, a processing capacity of 200 / sec is required, and the previous 100 types of communication patterns cannot be handled.

If the number of communication channels is 10, a processing capacity of 20 / second per channel is required.
In addition, when the communication of each wireless tag 80 is required three times and three cycles are required for the communication, 60 types of communication patterns are required per channel.
Nevertheless, as with the above, in each wireless tag 80, the number of tags that can be processed will increase probabilistically if it is sufficient that two or one communication can be performed without collision among the three communication opportunities. become.

For example, as shown in FIG. 14, when 18 types of communication patterns are used and communication is performed with a shift of one cycle at a time, the three communication periods may overlap in 90 ways surrounded by a dotted line. Since communication is performed in the same time slot in 5 ways (1 set and 7 ways), if there are 18 (90/5 = 18) wireless tags 80 per cycle, at least one communication is performed. There is a high possibility that this can be performed normally.
In this case, the number is 54 per 3 cycles (18 × 3 = 54), which is somewhat small, but sufficient results are obtained in consideration of the actual competition (actually about 30 people).

  In the above-described embodiment, the case where each wireless tag 80 performs communication three times has been described. However, the number of communications is not limited to three, and may be four or more.

In the above embodiment, the marathon competition has been described as an example, but the competition to be timed is not limited to this and is arbitrary.
For example, the present invention can be applied as appropriate to relay races, racewalking, disabled wheelchair road races, bicycle road races, triathlons, and mountain sports such as running and orientation.

  As described above, according to the present invention, it is possible to appropriately time the competition time of each competitor even in a situation where career sense cannot be performed in a relatively large competition.

It is a mimetic diagram showing an example of composition of a game timekeeping system concerning an embodiment of the present invention. (A) is a schematic diagram which shows an example of the loop coil (substantially rectangular shape) arrange | positioned on a runway, (b) is a schematic diagram for demonstrating the direction of the electromagnetic field and magnetic field detection coil which are produced | generated. (A) is a schematic diagram which shows an example of the loop coil (substantially 8 character shape) arrange | positioned on a runway, (b) is a schematic diagram for demonstrating the direction of the electromagnetic field and magnetic field detection coil which are produced | generated. (C) is a schematic diagram for demonstrating the intensity distribution of an electromagnetic field. It is a block diagram which shows an example of a structure of a wireless tag. (A), (b) is a schematic diagram for demonstrating the mode of detection of an electromagnetic field. (A)-(c) is a schematic diagram for demonstrating a time slot. (A), (b) is a schematic diagram for demonstrating a mode that it communicates by one communication pattern. (A)-(c) is a schematic diagram for demonstrating a mode that it communicates with a different communication pattern. (A), (b) is a schematic diagram for demonstrating more concretely a mode that it communicates with a different communication pattern. It is a flowchart for demonstrating the time transmission process which concerns on embodiment of this invention, and a time reception process. It is a schematic diagram for demonstrating a time slot being specified for every frequency | count of communication. (A)-(d) is a schematic diagram for demonstrating a mode that it communicates with another communication pattern. It is a schematic diagram for demonstrating more concretely a mode that it communicates with another communication pattern. It is a schematic diagram for demonstrating specifically the communication pattern used in a bigger competition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Timer apparatus 20 Modulation magnetic field generator 21 Loop coil 30 Magnetic field generator 31 Loop coil 40 Transmission control box 41 Transmitter 50 Time synchronization console 60 Reception control box 61 Receiver 70 Processing apparatus 80 Wireless tag

Claims (7)

A competition timing system including a plurality of wireless devices carried by each athlete, and a receiving device that receives information transmitted from each wireless device,
Each wireless device includes
Pattern information storage means for storing pattern information defining any time slot used for communication among a plurality of time slots divided into communication periods;
A time measuring means for measuring the reference time in the competition;
Detection means for detecting a trigger point based on an increase or decrease in the electromagnetic field intensity of the electromagnetic field generated on the runway;
When the trigger point is detected by the detection means, measurement means for measuring the time measured by the time measurement means as a competition time;
Wireless communication means for transmitting time information including the competition time measured by the measurement means to the receiving device in a time slot defined in the pattern information in the communication period;
The receiving device includes
Receiving means for receiving the time information transmitted in each time slot from the wireless communication means of each wireless device is provided,
A timekeeping system for competitions. The pattern information storage means stores pattern information defining each time slot used in the communication period of a plurality of times,
The wireless communication means transmits the time information in each time slot defined in the pattern information,
The competition timekeeping system according to claim 1, wherein: The pattern information is
A time slot that does not overlap the time slot defined in the pattern information of the other wireless device;
Defining a time slot that overlaps the time slot defined in the pattern information of another wireless device;
The game timing system according to claim 2, wherein: Each wireless device is grouped in advance into a plurality of groups,
The wireless communication means transmits the time information using a different communication channel for each group,
The receiving unit receives the time information transmitted from the wireless communication unit of each wireless device using each communication channel;
The game timing system according to any one of claims 1 to 3, wherein The receiving means receives the time information transmitted in a time slot in which no collision occurred in communication between the wireless devices;
The game timing system according to any one of claims 1 to 4, wherein A wireless device that is carried by each competitor and transmits information to the receiving device,
Pattern information storage means for storing pattern information defining any time slot used for communication among a plurality of time slots divided into communication periods;
A time measuring means for measuring the reference time in the competition;
Detection means for detecting a trigger point based on an increase or decrease in the electromagnetic field intensity of the electromagnetic field generated on the runway;
When the trigger point is detected by the detecting means, measuring means for measuring the time counted by the time measuring means as a competition time;
Wireless communication for transmitting time information including the competition time measured by the measuring means to the receiving device in a time slot defined by the pattern information stored in the pattern information storage means in the communication period Means,
A wireless device comprising: A time transmission method in a competition timing system including a plurality of wireless devices carried by each athlete, and a receiving device that receives information transmitted from each wireless device,
Each wireless device stores pattern information that defines any time slot used for communication among a plurality of time slots divided into communication periods.
In each of the wireless devices, a time measuring step for measuring a reference time in the competition;
In each of the wireless devices, a detection step of detecting a trigger point based on the increase or decrease of the electromagnetic field intensity of the electromagnetic field generated on the runway;
In each wireless device, when the trigger point is detected in the detection step, a measurement step of measuring the time measured in the time measurement step as a competition time;
In each of the wireless devices, a wireless communication step of transmitting time information including the competition time measured in the measuring step to the receiving device in a time slot defined by the pattern information in the communication period; ,
In the receiving device, each receiving step of receiving the time information transmitted in each time slot by the wireless communication step of each wireless device;
A time transmission method comprising:

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