JP2005250703A - Determination system and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a determination system and method for determining if active radio tags are moving together. <P>SOLUTION: The determination system includes a period acquisition part 10 for acquiring periods sent by the radio tags detected by a radio tag reader; an entry time anticipating part 20 for anticipating using the periods the entry time when each radio tag entered the detection range of the radio tag reader; an exit time anticipating part 30 for anticipating using the periods the exit time when each radio tag went out of the detection range of the radio tag reader; an overlap detection part 40 for detecting a plurality of radio tags whose entry times or exit times overlap; and a grouping determining part 50 for determining whether or not the plurality of radio tags detected by the overlap detection part 40 are moving together. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a determination system and a determination method for determining a moving object that moves together.

  2. Description of the Related Art Conventionally, a system has been proposed in which a wireless tag reader detects a flow line of a user or an article attached with a wireless tag, determines the status of the user or article from a plurality of wireless tags detected at the same time, and executes processing corresponding to the situation. ing.

For example, when a wireless tag reader installed on a bookshelf simultaneously detects a wireless tag attached to a user and a wireless tag attached to a book taken out, it is determined that the user borrowed the book, A system for registering lending is disclosed (for example, see Patent Document 1). A system in which the same method is applied to take-out management of medicine bottles displayed on a shelf is also disclosed (for example, see Patent Document 2).
JP 2001-22834 A JP 2001-52054 A

 Each of the above-described prior arts passively determines that a plurality of tags are detected at the same time by transmitting an interrogation wave from a radio tag reader, a plurality of radio tags responding to the interrogation wave, and detecting the response wave. A wireless tag of the type is assumed.

 However, in the case of an active type wireless tag that has a battery in the wireless tag and transmits from the wireless tag, since the transmission interval (cycle) is different for each wireless tag, a plurality of wireless tags are moving together. It was difficult to detect.

 In view of the above-described problems, an object of the present invention is to provide a determination system and a determination method for determining that an active wireless tag is moving together.

  In order to achieve the above object, the first feature of the present invention is that (a) a period acquisition means for acquiring a period transmitted by a wireless tag detected by a wireless tag reader; and (b) An entrance time predicting means for predicting an entrance time that has entered the detection range of the wireless tag reader; and (c) an exit time predicting means for predicting the exit time of the wireless tag from the detection range of the wireless tag reader using a period. (D) duplicate entry time detection means for detecting a plurality of wireless tags having overlapping entry times; (e) exit time duplication detecting means for detecting a plurality of wireless tags having overlapping entry times; The gist of the present invention is a determination system including a determination unit that determines whether or not a plurality of wireless tags detected by the entrance time overlap detection unit or the exit time overlap detection unit are moving together. Here, “period” refers to an interval at which the wireless tag transmits radio waves.

  According to the determination system according to the first feature, it can be determined that the active type wireless tag is moving together. In addition, wireless tags that are moving together can be accurately grouped based on the time when they entered the detection range of the wireless tag reader, the time when they exited together, the detection history, etc. Can be accurately grasped. For example, when a wireless tag is attached to each of the user and the user's belongings, the object owned by the user can be accurately grasped.

  Further, the admission time predicting means of the determination system according to the first feature includes a wireless tag from a detection time of a wireless tag first detected by a specific wireless tag reader to a time one cycle before the wireless tag from the detection time. May be predicted as the admission time.

  According to this determination system, it is possible to predict the admission time from “one cycle before the detection time” to “detection time”.

  The exit time predicting means of the determination system according to the first feature may be configured such that when a wireless tag detected by a specific wireless tag reader is not detected for a certain period of time, the time of the wireless tag is determined from the time of the last detection. Until the time after one cycle may be predicted as the leaving time of the wireless tag. Here, the “certain time” is, for example, one cycle of the wireless tag.

  According to this determination system, “after one cycle of detection time” can be predicted as “exit time” from “detection time”.

  Further, the determination means of the determination system according to the first feature includes a plurality of wireless tags when a plurality of wireless tags are detected by the entry time overlap detection means or the exit time overlap detection means in the wireless tag reader adjacent to the wireless tag reader. The wireless tag may be determined to be moving together.

  According to this determination system, it is possible to determine with high accuracy that the plurality of wireless tags are moving together.

  The second feature of the present invention is that (a) a step in which a wireless tag detected by the wireless tag reader transmits is acquired, and (b) the wireless tag is within the detection range of the wireless tag reader using the period. A step of predicting an entry time, (c) a step of predicting an exit time when the wireless tag exits from the detection range of the wireless tag reader using a period, and (d) a plurality of wireless tags having overlapping entry times. A step of detecting, a step of detecting a plurality of wireless tags having overlapping exit times, and a step of detecting a plurality of wireless tags detected by the entry time duplication detecting means or the exit time duplication detecting means. The gist of the present invention is a determination method including a step of determining whether or not the

  According to the determination system according to the second feature, it can be determined that the active type wireless tag is moving together.

 According to the present invention, it is possible to provide a determination system and a determination method for determining that an active wireless tag is moving together.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic.

(Judgment system)
The determination system according to the present embodiment determines whether a plurality of wireless tags detected by the wireless tag reader are moving together. The wireless tag is made of, for example, RF-ID (Radio Frequency Identification), holds a wireless tag identifier (ID) that is different for each wireless tag, and transmits a transmission signal of a predetermined frequency according to the ID at a constant interval. To send through. The wireless tag used in the present embodiment is an active wireless tag, and the transmission interval (cycle) differs for each wireless tag. For example, the wireless tags 101, 102, 103, and 104 shown in FIG.

  As shown in FIG. 1, the determination system according to the present embodiment includes a period acquisition unit 10, an entrance time prediction unit 20, an exit time prediction unit 30, an overlap detection unit 40, a grouping determination unit 50, and an accumulation. An information holding unit 60, wireless tag readers 70 and 71, and a period information holding unit 80 are provided.

  When the wireless tag readers 70 and 71 detect the wireless tags 101, 102, 103, and 104, the wireless tag readers are associated with the detected wireless tags and stored in the accumulated information holding unit 60. Specifically, as shown in FIG. 2, the accumulated information holding unit 60 holds a database having an area 60a for storing a wireless tag reader identifier and an area 60b for storing a wireless tag identifier. For example, since the wireless tag reader 70 has detected the wireless tags 101 and 102, the accumulated information holding unit 60 stores these in association with each other, and the wireless tag reader 71 has detected the wireless tags 101, 102, 103, and 104. The accumulated information holding unit 60 stores these in association with each other. In FIG. 1, two wireless tag readers 70 and 71 are shown. However, the number of wireless tag readers 70 and 71 is not limited. Similarly, the number of wireless tags 101, 102, 103, 104 detected is not particularly limited.

  The wireless tag readers 70 and 71 transmit wireless tag reader information (for example, wireless tag reader identifier), detected wireless tag information (for example, wireless tag identifier), and the time when the wireless tag is detected to the period acquisition unit 10. Here, it is assumed that the wireless tag reader 71 detects the wireless tag 104.

  The period acquisition unit 10 acquires the period transmitted by the wireless tag 104 from the period information stored in advance in the period information holding unit 80. As shown in FIG. 3, the period information holding unit 80 holds a database having an area 80a for storing the RFID tag identifier and an area 80b for storing the period of each RFID tag. For example, the period of the wireless tag 101 is 0.5 seconds, and the period of the wireless tag 102 is 0.1 seconds.

  When the period is associated with the wireless tag identifier in advance, the period information holding unit 80 holds the wireless tag identifier and the period in association with each other. For example, when the period is known from the model number of the wireless tag, the period information database may be set by the wireless tag manufacturer or the user who purchased the wireless tag. Alternatively, when the period information is also included in the radio wave received from the wireless tag, the period information holding unit 80 holds the received wireless tag identifier and the period in association with each other. On the other hand, when the period is not associated with the wireless tag identifier, the interval at which the wireless tag identifier is received in the determination system 1 is measured, the period is acquired, and the wireless tag identifier and the period are associated with each other and held. Good.

  When the wireless tag 104 is detected for the first time by the wireless tag reader 71, the period acquisition unit 10 detects the wireless tag information (for example, the wireless tag identifier 104) and the wireless tag 104 is detected by the wireless tag reader 71. The time and the period of the wireless tag 104 (0.05 sec in FIG. 3) are transmitted to the entrance time prediction unit 20.

  When the period acquisition unit 10 detects that a predetermined time has elapsed since the wireless tag reader 71 detected the wireless tag 104, the period acquisition unit 10 stores the wireless tag information (for example, the wireless tag identifier 104) and the wireless tag 104. The time last detected by the wireless tag reader 71 and the period of the wireless tag 104 (0.05 sec in FIG. 3) are transmitted to the exit time prediction unit 30. Here, the “certain time” may be, for example, a cycle of the wireless tag 104, specifically 0.05 sec.

  The period acquisition unit 10 constitutes a period acquisition unit.

  The entrance time prediction unit 20 predicts the entrance time when the wireless tag 104 has entered the detection range of the wireless tag reader 71 using the period received from the period acquisition unit 10. Specifically, the time from the detection time of the wireless tag 104 first detected by the wireless tag reader 71 to the time one period before the wireless tag from the detection time is predicted as the entry time of the wireless tag 104.

  For example, it is assumed that the wireless tag reader 71 detects the wireless tag 101 at time t1, the wireless tag 102 at time t2, the wireless tag 103 at time t3, and the wireless tag 104 at time t4. Assuming that the period information of the wireless tags 101, 102, 103, and 104 is p101, p102, p103, and p104, the expected entry time that the wireless tags 101, 102, 103, and 104 are within the detection range of the wireless tag reader 71 is These are times from t1-p101 to t1, from t2-p102 to t2, from t3-p103 to t3, and from t4-p104 to t4.

  Further, the entrance time prediction unit 20 transmits the entrance time predicted for the wireless tag 104 to the overlap detection unit 40 together with the wireless tag information.

  The entrance time prediction unit 20 constitutes an entrance time prediction unit.

  The leaving time predicting unit 30 predicts the leaving time when the wireless tag 104 comes out of the detection range of the wireless tag reader 71 using the period received from the period obtaining unit 10. Specifically, when the wireless tag 104 detected by the wireless tag reader 71 is not detected for a certain period of time, the exit time of the wireless tag 104 from the last detected time to the time one cycle after this time. To predict.

  For example, the wireless tag reader 71 detects the wireless tag 101 at time t′1, the wireless tag 102 at time t′2, the wireless tag 103 at time t′3, and the wireless tag 104 at time t′4. Suppose that Assuming that the period information of the wireless tags 101, 102, 103, 104 is p101, p102, p103, p104, the exit time at which the wireless tags 101, 102, 103, 104 are predicted to have come out of the detection range of the wireless tag reader 71 is , T′1 to t′1 + p101, t′2 to t ′ + p102, t′3 to t ′ + 103, and t′4 to t ′ + 104.

  Further, the exit time prediction unit 30 transmits the exit time predicted for the wireless tag 104 to the overlap detection unit 40 together with the wireless tag information.

  The leaving time predicting unit 30 constitutes a leaving time predicting unit.

  The overlap detection unit 40 includes a plurality of overlapped entrance time detection means for detecting a plurality of wireless tags that overlap the entrance time received from the entrance time prediction unit 20 and a plurality of exit times received from the exit time prediction unit 30. And an exit time duplication detecting means for detecting the wireless tag.

  FIG. 4 shows an example in which predicted entry times of a plurality of wireless tags overlap. In FIG. 4, the predicted entry time of the wireless tag 103 from t1−p101 to t1 that is the predicted entry time of the wireless tag 101 and from t2−p102 to t2 that is the predicted entry time of the wireless tag 102. Since t3-p103 to t3 are overlapping, they are detected by the overlap detection unit 40. However, the wireless tags 104 are not detected because the wireless tags 101, 102, and 103 do not overlap with t4 to p4, which is the predicted entry time of the wireless tag 104.

  FIG. 5 shows an example in which predicted exit times of a plurality of wireless tags overlap. In FIG. 5, from t1 which is the predicted leaving time of the wireless tag 101 to t1 + p101, from t2 which is the predicted leaving time of the wireless tag 102 to t2 + p102, from t3 which is the predicted leaving time of the wireless tag 103. Since it overlaps until t3 + p103, it is detected by the overlap detector 40. However, as in FIG. 4, the wireless tags 104 are not detected because the wireless tags 101, 102, and 103 do not overlap from t4 to t4 + p104, which is the predicted exit time of the wireless tag 104.

  In addition, the overlap detection unit 40 transmits the detected plurality of RFID tag information to the grouping determination unit 50.

  The grouping determination unit 50 constitutes a determination unit that determines whether or not a plurality of wireless tags detected by the overlap detection unit 40 (entrance time overlap detection unit or exit time overlap detection unit) are moving together.

  Specifically, the grouping determination unit 50 holds the received information of a plurality of wireless tags as a set in the accumulated information holding unit 60 and counts how many times the set is received. Then, it is determined whether or not the count number is larger than a preset threshold value. For example, in FIG. 4, the wireless tags 101, 102, and 103 having the same admission time are held as one set, and the number of times this set is received is counted. In this way, the number of wireless tag sets with overlapping entry times and the number of wireless tag sets with overlapping exit times are counted, and a threshold is provided for each.

  Further, the grouping determination unit 50 determines whether or not the wireless tag set is detected in the adjacent wireless tag reader for the wireless tag set that exceeds both the entrance and exit thresholds. Search by accessing. Then, the grouping determination unit 50 determines the set of wireless tags detected by the adjacent wireless tag reader as a group that moves together.

  For example, it is assumed that the overlap detection unit 40 detects that the predicted entry times and exit times of the wireless tags 101, 102, and 103 overlap. If the number of detections exceeds a preset threshold value, the grouping determination unit 50 searches the stored information holding unit 60, and the wireless tag reader 71 next to the wireless tag reader 71 from which the wireless tags 101, 102, 103 are detected. The tag reader 70 also searches whether it is detected together. In the example of FIG. 2, wireless tags 101 and 102 are detected by the wireless tag reader 70 that is a wireless tag reader adjacent to the wireless tag reader 71. Therefore, the grouping determination unit 50 finally determines the wireless tags 101 and 102 as a group.

  The threshold value used by the overlap detection unit 40 may be set in advance in the system or may be arbitrarily changed. For example, a service provider who wants to provide a service may arbitrarily set a threshold value. The grouped result can be used for the service.

  The determination system 1 according to the present embodiment includes a processing control device (CPU), and includes a period acquisition unit 10, an entrance time prediction unit 20, an exit time prediction unit 30, an overlap detection unit 40, a grouping determination unit 50, and the like. Can be built in the CPU as a module. These modules can be realized by executing a dedicated program for using a predetermined program language in a general-purpose computer such as a personal computer.

  The period information holding unit 80 and the accumulated information holding unit 60 are recording media for storing the period, the RFID tag information, the RFID tag reader information, and the like, respectively. Examples of the recording medium include RAM, ROM, hard disk, flexible disk, compact disk, IC chip, and cassette tape. According to such a recording medium, data such as period information and accumulated information can be easily stored, transported, sold, and the like.

  Although not shown, the determination system 1 includes a program holding unit that stores a determination program for causing a processing control device (CPU) to execute an entrance time prediction process, an exit time prediction process, a grouping determination process, and the like. Also good. The program holding unit is a recording medium such as a RAM, a ROM, a hard disk, a flexible disk, a compact disk, an IC chip, and a cassette tape. According to such a recording medium, the determination program can be easily stored, transported, sold, and the like.

(Judgment method)
Next, a determination method using the determination system according to the present embodiment will be described with reference to FIGS.

  (A) First, the wireless tags 101, 102, 103, 104 transmit wireless tag information to the wireless tag reader 71. In step S101, the wireless tag reader 71 receives wireless tag information (for example, a wireless tag identifier 104). In step S <b> 102, the wireless tag reader 71 stores the wireless tag information, the wireless tag reader information (for example, the wireless tag reader identifier 71), and the time when the wireless tag reader receives the wireless tag in the stored information holding unit 60. Then, the wireless tag reader 71 transmits the wireless tag information, the wireless tag reader information, and the time when the wireless tag reader receives the wireless tag to the period acquisition unit 10.

  (B) Next, in step S <b> 103, the cycle acquisition unit 10 acquires the cycle transmitted by the wireless tag 104 from the cycle information stored in the cycle information holding unit 80. In step S104, it is determined whether or not the wireless tag 104 is detected for the first time by the wireless tag reader 71. When the wireless tag 104 is detected for the first time by the wireless tag reader 71, the process proceeds to step S105, and the period acquisition unit 10 determines the wireless tag information, the time when the wireless tag 104 is detected by the wireless tag reader 71, and the wireless tag. The period of the tag 104 (0.05 sec in FIG. 3) is transmitted to the entrance time prediction unit 20. If it is not the first time, the process proceeds to step S106, and it is determined whether or not it has been detected that a certain time (for example, one period) has elapsed since the wireless tag reader 71 detected the wireless tag 104. When it is detected that the predetermined time has elapsed, the process proceeds to step S107, and the period acquisition unit 10 determines that the wireless tag information, the time when the wireless tag 104 was last detected by the wireless tag reader 71, and the wireless tag The period 104 (0.05 sec in FIG. 3) is transmitted to the leaving time prediction unit 30. On the other hand, if it is not detected that a certain time has elapsed, the process returns to step S101.

  (C) In step S <b> 105, the entrance time prediction unit 20 predicts the entrance time when the wireless tag 104 has entered the detection range of the wireless tag reader 71 using the period received from the period acquisition unit 10. Then, the entrance time prediction unit 20 transmits the entrance time predicted for the wireless tag to the overlap detection unit 40 together with the wireless tag information. In step S <b> 107, the leaving time predicting unit 30 predicts the leaving time when the wireless tag 104 comes out of the detection range of the wireless tag reader 71 using the period received from the period obtaining unit 10. Then, the leaving time prediction unit 30 transmits the leaving time predicted for the wireless tag to the overlap detection unit 40 together with the wireless tag information.

  (D) Next, in step S108, the overlap detection unit 40 detects a plurality of wireless tags with the same admission time received from the admission time prediction unit 20. Alternatively, a plurality of wireless tags having the same exit times received from the exit time prediction unit 30 are detected. Then, the overlap detection unit 40 transmits the detected plurality of RFID tag information to the grouping determination unit 50.

  (E) Next, in step S109, the grouping determination unit 50 holds the received information of the plurality of wireless tags as a set in the accumulated information holding unit 60, and counts how many times the set is received. In step S110, the grouping determination unit 50 determines whether the count number is greater than a preset threshold value. If larger, the process proceeds to step S111. If smaller, the process returns to step S101. Next, in step S111, the grouping determination unit 50 informs the stored information holding unit 60 of whether or not the wireless tag set in the adjacent wireless tag reader has been detected for the wireless tag set that exceeds the threshold. Search by accessing. In step S112, the grouping determination unit 50 determines the set of wireless tags detected by the adjacent wireless tag reader as a group that moves together.

(Action and effect)
The determination system and determination method according to the present embodiment obtains a period transmitted by the wireless tag detected by the wireless tag reader, uses this period to predict the entry time and the exit time, and the entrance time or the exit time overlaps. It can be determined whether or not a plurality of wireless tags are moving together. For this reason, it can be determined that active wireless tags having different periods for each device are moving together. Since an active wireless tag has a built-in battery, compared with a passive wireless tag, the active wireless tag has an advantage that the distance that can be recognized by the wireless tag reader is dramatically increased.

  In addition, wireless tags that are moving together can be accurately grouped based on the time when they entered the detection range of the wireless tag reader, the time when they exited together, the detection history, etc. Can be accurately grasped. For example, when a wireless tag is attached to each of the user and the user's belongings, the object owned by the user can be accurately grasped.

  Further, according to the determination system and the determination method according to the present embodiment, from the detection time of the wireless tag first detected by the specific wireless tag reader to the time one cycle before the wireless tag from the detection time, the wireless tag Can be predicted as the admission time. That is, it is possible to predict from “1 cycle before the detection time” to “detection time” as the entrance time.

  In addition, according to the determination system and the determination method according to the present embodiment, when a wireless tag detected by a specific wireless tag reader is not detected for a certain period of time, the wireless tag 1 is detected from the last detected time. Until the time after the cycle can be predicted as the leaving time of the wireless tag. That is, it is possible to predict from “detection time” to “one cycle after detection time” as the exit time.

  In addition, according to the determination system and the determination method according to the present embodiment, a plurality of wireless tags detected by a specific wireless tag reader are overlapped with each other in the wireless tag reader adjacent to the wireless tag reader. In this case, it can be determined that the plurality of wireless tags are moving together. It is determined that a plurality of wireless tags are moving together only by overlapping the entry time estimated to be within the detection range of the wireless tag reader and the exit time predicted to have come out of the detection range. Since it is difficult to do so, it is possible to determine with high accuracy that the plurality of wireless tags are moving together by referring to the history of the adjacent wireless tag reader.

  Further, according to the determination system and the determination method according to the present embodiment, information of a plurality of wireless tags having overlapping entrance times or exit times is held as a set, the number of times the set is received is counted, and the count number Is greater than a preset threshold value, it can be determined that the plurality of wireless tags are moving together. It is determined that a plurality of wireless tags are moving together only by overlapping the entry time estimated to be within the detection range of the wireless tag reader and the exit time predicted to have come out of the detection range. Since it is difficult to do so, it is possible to determine with high accuracy that the plurality of wireless tags are moving together by recognizing that they are overlapped a plurality of times.

(Other embodiments)
Although the present invention has been described according to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

 For example, in the present embodiment, the grouping determination unit 50 has been described as searching for the accumulated information holding unit 60 to determine that the group is also detected in the adjacent wireless tag reader. By doing so, the case where the same RFID tag reader has previously detected may be determined as the group moving together.

 Further, in the present embodiment, the grouping determination unit 50 has been described to count the number of wireless tag sets with which the entry time overlaps and the number of wireless tag sets with which the exit time overlaps, and compare them with a threshold value. Only when the entrance time and the exit time overlap may be counted as one count (that is, one count in the case of FIGS. 4 and 5). And you may provide the threshold value with respect to the number of sets with which entrance time and leaving time overlap.

 In FIG. 1, the periodic information holding unit 80 and the accumulated information holding unit 60 have been described separately. However, these may be shared by one holding unit.

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

It is a block diagram of the determination system according to the present embodiment. It is an example of the information which the accumulation | storage information holding part of the determination system which concerns on this embodiment hold | maintains. It is an example of the information which the period information holding part of the determination system concerning this embodiment holds. It is a figure which shows the example of the time when the wireless tag which concerns on this embodiment entered in the detection range of the wireless tag reader. It is a figure which shows the example of the time when the radio | wireless tag which concerns on this embodiment came out from the detection range of the radio | wireless tag reader. It is a flowchart of the determination method which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Determination system 10 Period acquisition part 20 Entrance time prediction part 30 Exit time prediction part 40 Overlap detection part 50 Grouping determination part 60 Accumulated information holding part 60a Radio tag reader identifier area 60b Radio tag identifier area 70, 71 Radio tag reader 80 Period information holding Part 80a Radio tag identifier area 80b Radio tag periodic area 101, 102, 103, 104 Radio tag

Claims (5)

Period acquisition means for acquiring a period at which the wireless tag detected by the wireless tag reader transmits;
An entrance time predicting means for predicting an entrance time when the wireless tag enters the detection range of the wireless tag reader using the cycle;
An exit time predicting means for predicting an exit time when the wireless tag has come out of the detection range of the wireless tag reader using the cycle;
Duplicate entry time detection means for detecting a plurality of wireless tags that overlap the entry time;
Exit time overlap detection means for detecting a plurality of wireless tags that overlap the exit time;
A determination system comprising: determination means for determining whether or not the plurality of wireless tags detected by the entry time overlap detection means or the exit time overlap detection means are moving together.   The admission time predicting means predicts, as the admission time of the wireless tag, from the detection time of the wireless tag first detected by a specific wireless tag reader to the time one cycle before the detection time of the wireless tag. The determination system according to claim 1, wherein:   When the wireless tag detected by a specific wireless tag reader is not detected for a certain period of time, the exit time predicting means, from the last detected time to the time one cycle after the wireless tag, The determination system according to claim 1, wherein the exit time of the wireless tag is predicted.   The determination unit is configured to move the plurality of wireless tags when the plurality of wireless tags are detected in the wireless tag reader adjacent to the wireless tag reader by the entry time overlap detection unit or the exit time overlap detection unit. The determination system according to any one of claims 1 to 3, wherein the determination system determines that both are in common. Obtaining a period at which the wireless tag detected by the wireless tag reader transmits;
Predicting the entry time when the wireless tag has entered the detection range of the wireless tag reader using the period; and
Predicting exit time when the wireless tag leaves the detection range of the wireless tag reader using the period; and
Detecting a plurality of wireless tags having overlapping entrance times;
Detecting a plurality of wireless tags that overlap the exit times;
A step of determining whether or not the plurality of wireless tags detected by the entrance time duplication detection means or the exit time duplication detection means are moving together.

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