JP2019015643A - Distance determining system and distance determination method - Google Patents

Abstract

To prevent the distance to a communication device from being determined by a device owned by a third party.SOLUTION: A distance determining system 1 comprises a transmitting device 10 and a distance determining device 20. The transmitting device 10 comprises a transmit data creation unit 12 for creating first transmit data that includes a transmitting device identifier, a control unit 13 for creating second transmit data in which a transmitted power identifier is added to the first transmit data, and a transmission unit 14 for transmitting a first telegram by electric power of power intensity that includes the second transmit data. The distance determining device 20 comprises a receive unit 22 for receiving the first telegram from the transmitting device 10 and acquiring the radio wave intensity of a radio wave that indicates the first telegram, an adjustment unit 23 for correcting the radio wave intensity on the basis of a coefficient of radio wave intensity correction that corresponds to the transmitted power identifier and thereby calculates a radio wave intensity correction value, a distance determination unit 24 for determining the distance from the distance determining device 20 to the transmitting device on the basis of the radio wave intensity correction value, and a display unit 25 for displaying the distance and the transmitting device identifier.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a distance determination system and a distance determination method for determining a distance from a distance determination device to a transmission device.

  BLE (Bluetooth (registered trademark) Low Energy) is known as one of short-range wireless communication technologies. BLE is a technology developed with the intention of performing Bluetooth communication with low power consumption. Further, a technique for determining a distance using radio wave intensity called RSSI (Received Signal Strength Indication) in BLE is known. In this technique, the distance determination device receives radio waves transmitted from a BLE tag included in a Bluetooth device at an arbitrary location. The BLE tag has an arbitrary UUID (Universally Unique Identifier) identifier. Then, the distance determination device, based on the RSSI (hereinafter referred to as “radio wave intensity”), the distance from the distance determination device to the Bluetooth device having the tag identified by the UUID (hereinafter referred to as “identifier”) Determine.

  For example, Non-Patent Document 1 determines the position of a communication device using the relationship between the distance between communication devices that perform near field communication using radio waves and the radio wave intensity of radio waves received by the communication device. It is disclosed.

  Non-Patent Document 2 describes that a moving direction and a moving distance of a communication device are determined based on a change in radio wave intensity of BLE.

  Non-Patent Document 3 describes determining the position of a communication device using a fingerprint method.

  Non-Patent Document 4 determines the position of the terminal based on the RSSI value in communication between the base installed in the region where the position is determined and the communication device, and the characteristics of the measurement environment learned in advance. Is described.

  Non-Patent Document 5 describes that a smartphone that supports BLE downloads an application for detecting BLE radio waves, and uses the application to acquire the identifier and radio wave intensity of radio waves transmitted from a transmitting device. ing. Thereby, even if it does not use a some detection apparatus, the distance of this communication device with a smart phone and a tag can be determined with one smart phone corresponding to BLE.

Tomomi Sato, 5 others, “Examination of location estimation method using Bluetooth radio field strength”, DEIM Forum (Data Engineering and Information Management Forum), B9-4, 2011 Miyoshi Horikawa and three others, “Proposal of Hybrid Indoor Positioning Method Using BLE Positioning and PDR”, Information Processing Society of Japan Research Report, Vol.2015-MBL-76 No.13, Vol.2015-CDS-14 No. 13, October 2, 2015 Ramsey Faragher, 1 other, “Location Fingerprinting With Bluetooth Low Energy Beacons”, IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL.33, NO.11, November 2015 Tomotaka Kanno and 3 others, "Learning coordinate estimation system based on learning and its application", The 23rd Annual Conference of the Japanese Society for Artificial Intelligence, 2009 ASCII.jp, “If you have two iPhones / iPads, you can experience iBeacon”, December 26, 2012, [Search June 1, 2017], Internet <URL: http: // ascii .jp / elem / 000/000/964/964201 / ＞

  As described above, a technique is known in which the radio wave intensity of “a radio wave indicating an identifier of a communication device” is acquired and the distance from the reception location of the radio wave to the communication device is determined based on the radio wave intensity. For example, a smartphone, a wearable device, or the like corresponding to the BLE standard or the WiFi (registered trademark) standard transmits a radio wave indicating an identifier. In this case, the device that has received the radio wave determines the distance to the smartphone, the wearable device, or the like that is identified by the identifier indicated by the radio wave, based on the intensity of the radio wave.

  By using such a technique, a plurality of detectors that can detect a communication device and measure the distance are arranged, and the distance to the communication device having an arbitrary identifier obtained from the plurality of detectors is determined by fingerprints or three. It is possible to construct a system for specifying the location of the communication device using edge surveying. For example, the system may be used by a parent to confirm the location of a child. The parent can have the communication device with the child, and the parent can access the system to determine the location of the communication device the child has.

  However, it is possible to easily measure the distance between the detector and the communication device without using such a system for identifying the location of the communication device. For example, a smartphone that supports BLE can measure the distance from a communication device that transmits radio waves in accordance with the BLE standard. Therefore, the third party confirms the distance between the detector owned by the third party and the communication device owned by the target person and the target person visually confirms the location of the target person who owns the communication device. It is also possible to specify. When a third party recognizes the distance from the communication device of the target person, there is a possibility that the target person having the communication device may commit crimes such as kidnapping and stalking, or infringe privacy. In addition, a malicious third party may recognize whether a resident who has a communication device is living at a nearby residence. In addition, even if a target person with a communication device escapes from the stalker or disguises because the stalker is not visually recognized, the communication device held by the target person can transmit from a third party to the target person. The distance may be known.

  The objective of this invention made | formed in view of this situation is to provide the distance determination system and distance determination method which can prevent the distance to a communication device being determined by the apparatus which a third party has.

  In order to solve the above problems, a distance determination system according to the present invention is a distance determination system including a transmission device and a distance determination device that perform short-distance wireless communication with each other, and the transmission device includes the transmission device. A transmission data creation unit that creates first transmission data including a transmitting device identifier for identification, and a control unit that creates second transmission data in which a transmission power identifier for identifying power intensity is added to the first transmission data And a transmission unit that transmits the first message including the second transmission data with the power of the power intensity, wherein the distance determination device receives the first message from the transmission device, and transmits the first message. A radio field intensity correction value by correcting the radio field intensity based on a radio field intensity correction coefficient corresponding to the transmission power identifier included in the first telegram; An adjusting unit that outputs, a distance determining unit that determines a distance from the distance determining device to the transmitting device based on the radio field intensity correction value, the distance determined by the distance determining unit, and the second transmission And a display unit that displays the transmitting device identifier included in the data.

  A distance determination system according to the present invention includes a transmission device, a plurality of distance determination devices that perform short-range wireless communication with the transmission device, and a position determination device that receives information from the distance determination device. In the system, the transmitting device includes a transmission data generating unit that generates first transmission data including a transmitting device identifier for identifying the transmitting device, and a transmission power identifier for identifying power intensity. A control unit that creates second transmission data added to the transmission data; and a transmission unit that transmits the first telegram including the second transmission data to the position detection device with the power of the power intensity. Each of the distance determination devices receives the first telegram from the transmission unit of the transmission device, acquires a radio field intensity of a radio wave indicating the telegram, and the transmission power identifier included in the first telegram. An adjustment unit that calculates a radio field intensity correction value by correcting the radio field intensity based on a corresponding radio field intensity correction coefficient, and determines a distance from the distance determination device to the transmission apparatus based on the radio field intensity correction value A distance determination unit, a position information indicating the position of the own device, and a transmission unit that transmits a second telegram including the distance information indicating the distance to the position determination device, Based on the receiving unit that receives the second telegram and the radio wave intensity information from the transmitting unit of each of the distance determination devices, and the self-location information and the distance information included in each of the plurality of second telegrams, A position determination unit for determining the position of the transmission device, position information indicating the position of the transmission device determined by the position determination unit, and the transmission device identifier included in the second telegram Characterized in that it comprises a transmitter which transmits.

  The distance determination method according to the present invention is a distance determination method executed by a transmission device and a distance determination device that perform short-distance wireless communication with each other, wherein the transmission device identifies the transmission device. Creating first transmission data including a device identifier; creating second transmission data in which a transmission power identifier for identifying power intensity is added to the first transmission data; and Transmitting a first telegram including second transmission data, wherein the distance determining device receives the first telegram from the transmitting device, and acquires a radio field intensity of a radio wave indicating the first telegram. Calculating a radio field intensity correction value by correcting the radio field intensity based on a radio field intensity correction coefficient corresponding to the transmission power identifier included in the first telegram; and Determining a distance from the distance determination device to the transmission device based on a degree correction value, and displaying the distance and the transmission device identifier included in the second transmission data. It is characterized by.

  According to the present invention, it is an object to prevent a distance to a communication device from being determined by an apparatus possessed by a third party.

It is a figure which shows the structural example of the distance determination system which concerns on 1st Embodiment. It is a figure which shows the example of the transmission setting information set by the transmission setting part shown in FIG. It is a figure which shows the structure of 1st transmission data, 2nd transmission data, and a 1st message | telegram. It is a figure which shows the example of the reception setting information set by the reception setting part shown in FIG. It is a figure which shows the example of a whole structure image of 1st Embodiment, and the example of a display of a distance determination apparatus and another apparatus. It is a sequence diagram which shows an example of the preparation process of the distance determination method which concerns on 1st Embodiment. It is a sequence diagram which shows an example of the display process of the distance determination method which concerns on 1st Embodiment. It is a flowchart which shows the detail of the process based on the transmission setting information shown in FIG. It is a flowchart which shows the detail of the process based on the reception setting information shown in FIG. It is a figure which shows the structural example of the distance determination system which concerns on 2nd Embodiment. It is a figure which shows the structure of 3rd transmission data and a 2nd message | telegram. It is a figure which shows the example of a whole structure image of 2nd Embodiment, and the example of a display of a position determination apparatus. It is a figure which shows the other structural example of the distance determination system which concerns on 1st Embodiment. It is a figure which shows the other structural example of the distance determination system which concerns on 2nd Embodiment.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a configuration example of a distance determination system 1 according to the first embodiment. As shown in FIG. 1, the distance determination system 1 includes a transmission device 10 and a distance determination device 20. The transmission device 10 and the distance determination device 20 can perform short-distance wireless communication with each other. The short-range wireless communication standard may include, for example, the BLE standard and the WiFi standard.

<Transmitting device>
The transmitting device 10 transmits a first telegram including arbitrary data by short-range wireless communication. The transmission device 10 includes a transmission setting unit 11, a transmission data creation unit 12, a control unit 13, and a transmission unit 14.

  The transmission setting unit 11 sets a transmission device identifier, transmission interval information, and transmission setting information. The transmission device identifier is an identifier for uniquely identifying the transmission device 10. The transmission interval information is information indicating a time interval at which the transmission data creation unit 12 creates the first transmission data, and is also information indicating a time interval at which the transmission unit 14 transmits the first message.

  The transmission setting information includes a transmission power identifier, the number of times or time when the transmission power identifier is continuously added to first transmission data to be described later, the order in which the transmission power identifier is added, and the power intensity corresponding to the transmission power identifier. Multiple combinations are included.

  Specifically, as illustrated in FIG. 2, the transmission setting information includes a plurality of combinations of item numbers, transmission power identifiers, standby times, and procedure information. The item number is a number for identifying each combination included in the transmission setting information. The transmission power identifier is a name that identifies the number of standby times and procedure information corresponding to each item number. The number of standby times is the number of times that the control unit 13 continuously adds the same transmission power identifier to the first transmission data. The standby time is a time during which the control unit 13 continuously adds the same transmission power identifier to the first transmission data. The procedure information includes power intensity and order. The power intensity indicates the intensity of transmission power used when the transmission unit 14 transmits data. The order indicates the order of transmission power identifiers used by the transmission data creation unit 12 and the control unit 13 for processing.

  When the transmission device 10 is activated, the transmission data creation unit 12 acquires the transmission device identifier and transmission interval information from the transmission setting unit 11 and stores them in the memory. Further, the transmission data creation unit 12 creates first transmission data at a time interval indicated by the transmission interval information. As shown in FIG. 3A, the first transmission data is data including a transmission device identifier and arbitrary data, for example. When the transmission data creation unit 12 creates the first transmission data, the transmission data creation unit 12 outputs the first transmission data to the control unit 13.

  When the transmission device 10 is activated, the control unit 13 acquires transmission setting information from the transmission setting unit 11 and stores it in the memory. Specifically, the control unit 13 stores each item number of the transmission setting information, a transmission power identifier corresponding to each item number, the number of standby times, and procedure information in the memory.

  Further, the control unit 13 stores the constant n as the number of combinations (number of rows) in the transmission setting information. The control unit 13 sets the first variable k corresponding to each item number of the transmission setting information to an initial value (for example, “1”) and stores it in the memory. The control unit 13 stores the second variable s corresponding to the number of standby times of the transmission setting information in the memory as the number of standby times corresponding to the item number indicated by the first variable k. In the example illustrated in FIG. 2, the control unit 13 sets the first variable k to the initial value “1”, and sets the second variable s to the standby count “1200” corresponding to the item number “1”.

  Further, the control unit 13 receives the first transmission data output from the transmission data creation unit 12. When receiving the first transmission data, the control unit 13 performs a predetermined process based on a predetermined rule indicated by the transmission setting information. For the predetermined processing, as shown in FIG. 3B, second transmission data in which any one of a plurality of transmission power identifiers stored in the transmission setting information is added to the first transmission data is generated and transmitted. Processing to be output to the unit 14 is included. The predetermined process includes a process of outputting power intensity information indicating the power intensity corresponding to the transmission power identifier added to the first transmission data to the transmission unit 14.

  Here, a process in which the control unit 13 generates the second transmission data based on a predetermined rule will be described in detail.

  The control unit 13 creates second transmission data in which the transmission power identifier is added to the first transmission data based on the number of standby times or the standby time included in the transmission setting information and the order. If it demonstrates using the example shown by FIG. 2, the control part 13 will set the 1st variable k to the initial value "1", and the 2nd variable s to "1200" as mentioned above. When receiving the first transmission data from the transmission data creation unit 12, the control unit 13 subtracts 1 from the second variable s stored in the memory. And the control part 13 performs a process based on the procedure information corresponding to the item number which the 1st variable k shows, when the 2nd variable s is 1 or more. Specifically, 1199 obtained by subtracting 1 from 1200 which is the second variable s is 1 or more. In this case, the control unit 13 creates the second transmission data by adding the transmission power identifier “abc1” of item number 1 corresponding to the first variable k to the first transmission data. Further, the control unit 13 outputs power intensity information indicating 100% power intensity to the transmission unit 14 based on the transmission procedure information of item number 1 corresponding to the first variable k. The power intensity when the transmission power is not changed is 100%.

  When receiving the first transmission data next time, the controller 13 further subtracts 1 from the second variable s. Specifically, the control unit 13 sets 1198 obtained by subtracting 1 from 1199 which is the second variable s as a new second variable s. The new second variable s 1198 is 1 or more. In this case, the control unit 13 performs the same process as described above. In this way, the control unit 13 repeats the process every time the first transmission data is received. When the second variable s becomes smaller than 1, the first variable k is equal to the number n of lines in the transmission setting information. Determine whether.

  When it is determined that the first variable k is the same as the number n of lines in the transmission setting information, the control unit 13 sets the first variable k to 1. When it is determined that the first variable k is not the same as the number n of lines in the transmission setting information, the control unit 13 sets a value obtained by adding 1 to the first variable k as a new first variable k. In the example shown in FIG. 2, n = 4. In the above example, since the first variable k is 1, it is not the same as n. Therefore, the control unit 13 sets 2 which is obtained by adding 1 to 1 which is the first variable k as a new first variable k. Then, the control unit 13 sets the second variable s to 600, which is the number of standby times for item number 2 corresponding to the first variable k. Then, the control unit 13 creates the second transmission data by adding the transmission power identifier “def2” of item number 2 to the first transmission data. In addition, the control unit 13 outputs the generated second transmission data to the transmission unit 14. Further, the control unit 13 outputs power intensity information indicating the power intensity of 80% to the transmission unit 14 based on the transmission procedure information of item number 2 corresponding to the first variable k.

  The control unit 13 decreases the second variable s by 1 each time this process is repeated. Then, when the second variable s becomes smaller than 1, the control unit 13 adds 1 to the first variable k to 3, and sets the second variable s to the standby count 300 corresponding to the item number 3. When the transmission data creation unit 12 creates the first transmission data at the time interval indicated by the transmission interval information and the control unit 13 performs the above processing on the first transmission data, 600 in the example illustrated in FIG. The time for repeating the process is equivalent to 1 minute.

  The transmission unit 14 receives the power intensity information and the second transmission data output from the control unit 13. When receiving the second transmission data from the control unit 13, the transmission unit 14 generates a first message including the second transmission data. The electronic message is data in which a header and a footer are added to the second transmission data as shown in FIG. When the second transmission data is generated, the transmission unit 14 transmits the first telegram with the power of the power intensity indicated by the received power intensity information.

<Distance determination device>
The distance determination device 20 receives the first telegram transmitted from the transmission device 10. The distance determination device 20 determines the distance from the distance determination device 20 to the transmission device 10 based on the radio wave intensity of the radio wave indicating the first telegram. As shown in FIG. 1, the distance determination device 20 includes a reception setting unit 21, a reception unit 22, an adjustment unit 23, a distance determination unit 24, and a display unit 25.

  The reception setting unit 21 is a memory that stores predetermined information. The reception setting unit 21 sets reception setting information as shown in FIG. The reception setting information includes a plurality of combinations of item numbers, transmission power identifiers, and reception procedure information. The item number is a number for identifying each combination included in the reception setting information. The transmission power identifier is the same as the transmission power identifier included in the transmission procedure information set in the transmission device 10. The reception procedure information corresponds to the transmission procedure information. Specifically, the reception procedure information includes the radio wave intensity of the received radio wave when the transmission power is changed based on a predetermined rule indicated by the transmission procedure information, and the radio wave when the transmission power is transmitted without being changed. The rules for correcting for intensity are shown. More specifically, the reception procedure information includes a radio wave intensity correction coefficient corresponding to each transmission power identifier. The radio wave intensity correction coefficient is the reciprocal of the power intensity corresponding to the transmission power identifier in the transmission procedure information. Thus, the radio field intensity correction value calculated by correcting the radio field intensity based on the reception procedure information indicates the radio field intensity when the transmitting device 10 receives the radio wave transmitted without changing the power.

  The receiving unit 22 receives the first telegram transmitted from the transmission device 10. The receiving unit 22 acquires the second transmission data included in the first message. The receiving unit 22 acquires the radio wave intensity of the radio wave indicating the first telegram, and generates radio wave intensity information including the radio wave intensity. The receiving unit 22 outputs the second transmission data and the radio wave intensity information to the adjusting unit 23.

  When the distance determination device 20 is activated, the adjustment unit 23 acquires the reception setting information set by the reception setting unit 21 and stores it in the memory. Specifically, the adjustment unit 23 stores each item number of the reception setting information and the transmission power identifier and procedure information corresponding to each item number in the memory.

  The adjusting unit 23 receives the second transmission data and the radio wave intensity information output from the receiving unit 22. The adjustment unit 23 corrects the radio wave intensity using the radio wave intensity correction coefficient corresponding to the transmission power identifier included in the second transmission data.

  Specifically, the adjustment unit 23 acquires a transmission power identifier from the second transmission data. And the adjustment part 23 collates the transmission power identifier of 2nd transmission data, and the transmission power identifier of reception setting information, and acquires object reception procedure information. For example, the adjustment unit 23 acquires the radio wave intensity correction coefficient corresponding to the transmission power identifier included in the reception setting information, which is the same as the transmission power identifier included in the second transmission data. Then, the adjustment unit 23 corrects the radio wave intensity based on the acquired radio wave intensity correction coefficient. Referring to the example shown in FIG. 4, when the transmission power identifier of the second transmission data is “abc1”, the radio wave intensity correction coefficient is 100/100, so the radio wave intensity is not corrected. When the transmission power identifier included in the radio wave intensity information is “def2”, the radio wave intensity correction coefficient is 100/90. In this case, the adjustment unit 23 calculates the radio field intensity correction value by correcting the radio field intensity to 100/90 times. Similarly, when the transmission power identifiers of the second transmission data are “ghk3” and “hij4”, the adjustment unit 23 corrects the radio wave intensity to 100/80 times and 100/90 times, respectively, and sets the radio wave intensity correction value. Is calculated.

  The adjustment unit 23 outputs the radio wave intensity correction information including the radio wave intensity correction value and the first transmission data included in the second transmission data to the distance determination unit 24.

  The distance determination unit 24 receives the radio wave intensity correction information and the first transmission data. The distance determination unit 24 determines the distance from the distance determination device 20 to the transmission device 10 based on the radio wave intensity correction value included in the radio wave intensity correction information. Any known method may be used to determine the distance. For example, the distance determination unit 24 can extract the distance stored in advance in the memory corresponding to the radio wave intensity correction value, and can set the extracted distance as the distance from the distance determination device 20 to the transmission device 10.

  When the BLE standard is applied as a standard for short-range communication between the transmission device 10 and the distance determination device 20, the distance determination unit 24 is included in an arbitrary field (for example, a header portion) of the first message. The distance may be determined using the value of the radio field strength field. The radio field strength field indicates the relationship between the distance between two communication devices that perform communication and the radio field intensity. Therefore, the distance determination unit 24 can determine the distance using the value of the radio field strength indicating the reference based on the radio field intensity correction value.

  The distance determination unit 24 outputs distance information indicating the distance determined based on the radio field intensity correction value and the transmission device identifier included in the first transmission data to the display unit 25. The distance determination unit 24 may output the radio wave intensity correction information to the display unit 25 instead of the distance information or in addition to the distance information.

  The display unit 25 receives the transmission device identifier output from the distance determination unit 24 and the distance information. The display unit 25 displays the transmission device identifier and the distance information on the display. The display unit 25 may receive the radio wave intensity correction information instead of the distance information or in addition to the distance information, and display it on the display.

  FIG. 5 shows an example in which the display unit 25 displays the transmitting device identifier and the radio wave intensity correction information on the display. The display unit 25 included in the distance determination device 20 of the present embodiment displays the radio wave intensity correction value included in the radio wave intensity correction information by the adjustment unit 23 as described above. On the other hand, another device different from the distance determination device 20 of the present embodiment cannot correct the radio wave intensity of the radio wave received by the device, and displays it as it is.

  Next, the preparation process of the distance determination method by the distance determination system 1 will be described with reference to FIG. FIG. 6 is a sequence diagram illustrating an example of a distance determination method setting process. The preparation process is started when the transmission device 10 and the distance determination device 20 are activated.

  The transmission data creation unit 12 acquires the transmission device identifier and the transmission interval information from the transmission setting unit 11 and stores them in the memory (step S11).

  The control unit 13 acquires the transmission setting information from the transmission setting unit 11 and stores it in the memory (step S12).

  Next, the control unit 13 stores the value of the constant n as the number of lines of transmission setting information (step S13).

  Next, the control unit 13 sets the first variable k as an initial value and stores it in the memory (step S14).

  Next, the control unit 13 stores the second variable s in the memory as the number of standby times corresponding to the item number indicated by the first variable k (step S15).

  The adjustment unit 23 acquires the reception setting information set by the reception setting unit 21 and stores it in the memory (step S16).

  Next, the display process of the distance determination method by the distance determination system 1 will be described with reference to FIG. FIG. 7 is a sequence diagram illustrating an example of display processing of the distance determination method. The preparation process is started when the preparation processes of the transmission device 10 and the distance determination device 20 are completed.

  Next, the transmission data creation unit 12 creates first transmission data at a time interval indicated by the transmission interval information set in the transmission setting unit 11 (step S21).

  Next, the transmission data creation unit 12 outputs the first transmission data to the control unit 13 (step S22).

  The control unit 13 receives the first transmission data output from the transmission data creation unit 12 (step S23).

  Next, the control part 13 performs the process based on transmission setting information (step S24).

  Here, the process based on the transmission setting information performed by the control unit 13 will be described in detail with reference to FIG.

  First, the control unit 13 subtracts 1 from the second variable s stored in the memory (step S241).

  Next, the control unit 13 determines whether or not the second variable s is less than 1 (step S242).

  If it is determined in step S242 that the second variable s is less than 1, the control unit 13 determines whether or not the first variable k is the same as n (step S243).

  When it is determined that the first variable k is the same as n, the control unit 13 sets the first variable k to 1 (step S244).

  When it is determined that the first variable k is not the same as n, the control unit 13 adds 1 to the first variable k (step S245).

  Next, the control unit 13 stores the second variable s in the memory as the number of standby times corresponding to the item number indicated by the first variable k (step S246).

  Next, the control unit 13 creates the second transmission data by adding the transmission power identifier corresponding to the item number of the first variable k to the first transmission data (step S247).

  Next, the control unit 13 outputs power intensity information to the transmission unit 14 based on the procedure information corresponding to the item number of the first variable k (step S248).

  Next, the control unit 13 outputs the second transmission data created in step S247 to the transmission unit 14 (step S249).

  Returning to FIG. 7, the transmission unit 14 receives the power intensity information output from the control unit 13 (step S25).

  The transmission unit 14 receives the second transmission data (step S26).

  Next, the transmission part 14 produces a 1st message | telegram based on 2nd transmission data (step S27).

  Next, the transmission part 14 transmits a 1st message | telegram with the electric power of the electric power intensity | strength which electric power intensity | strength information shows (step S28).

  The receiving unit 22 of the distance determining device 20 receives the first telegram transmitted from the transmitting device 10 (step S29).

  Next, the receiving unit 22 acquires the second transmission data from the first telegram, and outputs the second transmission data and the radio field intensity information indicating the radio field intensity of the radio wave indicating the first telegram to the adjustment unit 23 (step S30). ).

  The adjustment unit 23 receives the second transmission data and the radio wave intensity information output from the reception unit 22 (step S31).

  Next, the adjustment unit 23 performs a process based on the reception setting information stored in the memory (step S32).

  Here, processing based on the reception setting information performed by the adjustment unit 23 will be described in detail with reference to FIG.

  The adjustment unit 23 acquires a transmission power identifier from the second transmission data (step S321).

  Next, the adjustment unit 23 compares the transmission power identifier of the second transmission data with the transmission power identifier of the reception setting information, and acquires the target reception procedure information (step S322).

  Next, the adjustment unit 23 calculates a radio field intensity correction value by correcting the radio field intensity indicated by the radio field intensity information using the radio field intensity correction coefficient included in the reception procedure information (step S323).

  Returning to FIG. 7, the adjustment unit 23 outputs the radio wave intensity correction information indicating the radio wave intensity correction value and the first transmission data included in the second transmission data to the distance determination unit 24 (step S33).

  The distance determination unit 24 receives the first transmission data and the radio wave intensity information output from the adjustment unit 23 (step S34).

  The distance determination unit 24 determines the distance from the distance determination device 20 to the transmission device 10 based on the radio wave intensity correction value indicated in the radio wave intensity information (step S35).

  Next, the distance determination unit 24 outputs the transmission device identifier and the distance information to the display unit 25 (step S36).

  The display unit 25 receives the transmission device identifier and the distance information output from the distance determination unit 24 (step S37).

  Next, the display unit 25 displays the transmission device identifier and the distance information on the display (step S38).

  As described above, according to the first embodiment, the transmitting device 10 transmits radio waves with the power having the power intensity identified by the transmission power identifier. The distance determination device 20 that has received the radio wave calculates a radio wave intensity correction value by correcting the radio wave intensity of the radio wave based on the transmission power identifier. Then, the distance determination device 20 determines the distance from the distance determination device 20 to the transmission device 10 based on the radio wave intensity correction value. For this reason, the distance determination device 20 can acquire the radio wave intensity when the radio wave transmitted by the transmission device 10 without changing the power is received, and the distance to the transmission device 10 is determined based on the radio wave intensity. can do.

  On the other hand, a device owned by a third party receives the radio waves transmitted by the transmitting device 10 by changing the power. For this reason, the distance of the transmitter 10 determined based on the radio field intensity of the radio wave is not accurate. In other words, even if the transmitting device 10 is stationary, the radio wave intensity of the radio wave indicating the first telegram received by the other device is changed, so that the other device is operating as the transmitting device 10 is moving. recognize.

  Further, the transmitting device 10 transmits the second transmission data with power of power intensity corresponding to one transmission power identifier among a plurality of transmission power identifiers based on a predetermined rule. Therefore, even if a device owned by a third party receives a radio wave transmitted from the transmission device 10, it cannot correct the radio wave intensity based on the transmission power identifier. Therefore, it is possible to prevent the distance from the device to the transmission device 10 from being determined by a device owned by a third party.

  As described above, the legitimate distance determination device 20 can determine the distance from the distance determination device 20 to the transmission device 10, and the distance from the device to the transmission device 10 by a device owned by a third party is determined. To prevent.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 10, the distance determination system 2 according to the second embodiment includes a transmission device 10, a plurality of distance determination devices 30, a position determination device 40, and a display device 50. The transmission device 10 can communicate with each of the plurality of distance determination devices 30 by short-range wireless communication. The short-range wireless communication standard may include, for example, the WiFi standard. The distance determination device 30 and the position determination device 40 can communicate with each other according to a short-distance or long-distance wireless communication standard or a wired communication standard. FIG. 10 shows an example in which the distance determination device 30 and the position determination device 40 communicate with each other according to a wired communication standard. The position determination device 40 and the display device 50 can communicate according to a short-range or long-range wireless communication standard or a wired communication standard. FIG. 10 shows an example in which the position determination device 40 and the display device 50 communicate with each other according to a wireless communication standard. Note that the same reference numerals are assigned to the same configuration blocks as those of the distance determination system 1 in the first embodiment, and description thereof will be omitted as appropriate.

<Transmitting device>
The transmission device 10 in the second embodiment is the same as the transmission device 10 in the first embodiment.

<Distance determination device>
The plurality of distance determination devices 30 exist in different places. The distance determination device 30 includes a reception setting unit 31, a reception unit 32, an adjustment unit 33, a distance determination unit 34, a self location report unit 35, a transmission data creation unit 36, and a transmission unit 37.

  The reception setting unit 31, the reception unit 32, the adjustment unit 33, and the distance determination unit 34 are the same as the reception setting unit 21, the reception unit 22, the adjustment unit 23, and the distance determination unit 24 of the first embodiment, respectively.

  The own position report unit 35 acquires own position information indicating the position of the distance determination device 30. For example, the self location report unit 35 may include a GPS receiver. In this case, the own position report unit 35 receives information from the GPS satellite and acquires the own position information based on the information. Further, when the distance determination device 30 is fixedly installed, the own position report unit 35 acquires the own position information stored in advance in the memory of the distance determination device 30. In addition, the own location report unit 35 outputs the acquired own location information to the transmission data creation unit 36.

  The transmission data creation unit 36 creates third transmission data. As illustrated in FIG. 11A, the third transmission data includes a transmission device identifier and arbitrary data included in the first message received by the reception unit 32, a distance determination device identifier for identifying the distance determination device 30, and The distance information indicating the distance determined by the distance determination unit 24 and the own position information output from the own position report unit 35 are included. When the transmission data creation unit 36 creates the third transmission data, the transmission data creation unit 36 outputs the third transmission data to the transmission unit 37.

  The transmission unit 37 receives the third transmission data output from the transmission data creation unit 36. When receiving the third transmission data from the transmission data creating unit 36, the transmission unit 37 generates a second telegram including the third transmission data. As shown in FIG. 11B, the second telegram is data in which a header and a footer are added to the third transmission data. The transmission part 37 will transmit this 2nd message | telegram to the position determination apparatus 40, if a 2nd message | telegram is produced | generated.

<Position determination device>
The position determination device 40 includes a reception unit 41, a position determination unit 42, and a transmission unit 43.

  The receiving unit 22 receives the second telegram from each of the plurality of distance determination devices 30. In addition, the reception unit 22 outputs a plurality of combinations of the own position information, the distance information, the transmission device identifier, and the distance determination device identifier respectively included in the plurality of second telegrams to the position determination unit 42.

  The position determination unit 42 receives a plurality of combinations of the own position information, the distance information, the transmission device identifier, and the distance determination device identifier output from the reception unit 22. As described above, the own position information indicates the position of the distance determination device 30, and the distance information indicates the distance from the distance determination device 30 to the transmission device 10. For this reason, the position determination unit 42 determines the position of the transmission device 10 based on the distance from each of the plurality of distance determination devices 30 to the transmission device 10 identified by the transmission device identifier. Any known method can be used to determine the position based on each distance. In addition, the position determination unit 42 outputs position information indicating the determined position, a transmission device identifier, and a distance determination device identifier to the transmission unit 43.

  The transmission unit 43 transmits the position information, the transmission device identifier, and the distance determination device identifier output from the position determination unit 42 to the display device 50.

<Display device 50>
The display device 50 includes a receiving unit 51 and a display unit 52.

  The receiving unit 51 receives the position information, the transmission device identifier, and the distance determination device identifier transmitted from the position determination device 40. The receiving unit 51 outputs the received position information, transmission device identifier, and distance determination device identifier to the display unit 52.

  The display unit 52 receives the position information, the transmission device identifier, and the distance determination device identifier output from the reception unit 51. As shown in FIG. 12, the display unit 52 displays the received position information, transmission device identifier, and distance determination device identifier on the display. The display unit 52 may not display the distance determination device identifier on the display. In this case, the third transmission data and the second message may not include the distance determination device identifier.

  As shown in FIG. 13, in the first embodiment, the transmission device 10 and the distance determination device 20 may include a first time unit 15 and a second time unit 26, respectively.

  The first time unit 15 sets the time and the transmission power identifier in association with each other. The second time unit 26 sets the time and the transmission power identifier in association with each other.

  In this case, the first time unit 15 creates a hash value calculated by combining the current time and a predetermined numerical value as a transmission power identifier. Then, the control unit 13 creates second transmission data in which the transmission device identifier created by the first time unit 15 is added to the first transmission data. In this case, when the reception unit 22 of the distance determination device 20 receives the first telegram transmitted from the transmission device 10, the second time unit 26 calculates a hash value by combining the received time and a predetermined numerical value. Then, when the hash value is the same as the transmission power identifier, the adjustment unit 23 corrects the radio wave intensity with the radio wave intensity correction coefficient corresponding to the transmission power identifier.

  As shown in FIG. 14, in the second embodiment, the transmission device 10 and the distance determination device 20 may include a first time unit 15 and a second time unit 26, respectively. Since the 1st time part 15 and the 2nd time part 26 in 2nd Embodiment are the same as the 1st time part 15 and 2nd time part 26 in 1st Embodiment, description is abbreviate | omitted.

  As described above, according to the second embodiment, the transmission device 10 transmits a radio wave with the power having the power intensity identified by the transmission power identifier, and the plurality of distance determination devices 30 receive the radio wave. Each of the plurality of distance determination devices 30 calculates a radio wave intensity correction value by correcting the radio wave intensity of the radio wave based on the transmission power identifier included in the first telegram transmitted from the transmission device 10. Each of the plurality of distance determination devices 30 determines the distance from the own device to the transmission device 10 based on the radio wave intensity correction value.

  On the other hand, a device owned by a third party receives the radio waves transmitted by the transmitting device 10 by changing the power. For this reason, the distance of the transmitter 10 determined based on the radio field intensity of the radio wave is not accurate. In other words, even if the transmitting device 10 is stationary, the radio wave intensity of the radio wave indicating the first telegram received by the other device is changed, so that the other device is operating as the transmitting device 10 is moving. recognize. For this reason, there exists an effect similar to 1st Embodiment which can prevent the apparatus which a third party has can determine the distance from this apparatus to the transmitter 10 based on the radio wave intensity. .

  Furthermore, according to the second embodiment, the distance determination device 20 can determine the position of the transmission device 10 based on the distance from each of the plurality of distance determination devices 30 to the transmission device 10.

  Moreover, in order to function as the transmission apparatus 10 mentioned above, a computer can be used suitably. Such a computer can be realized by storing a program describing processing contents for realizing each function of the transmitting device 10 in a database of the computer, and reading and executing the program by the CPU of the computer. it can. The same applies to the distance determination device 20.

  The program may be recorded on a computer readable medium. If a computer-readable medium is used, it can be installed on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, but may be a recording medium such as a CD-ROM or a DVD-ROM.

  In the above-described embodiment, the transmission setting unit 11 may set a plurality of transmitting device identifiers. In this case, the transmission data creation unit 12 may change the transmission device identifier included in the first transmission data according to a predetermined change rule. For example, the transmission data creation unit 12 includes one transmission device identifier among the plurality of transmission device identifiers in the first transmission data for a predetermined time or a predetermined number of times. Thereafter, the transmission data creation unit 12 includes other transmission device identifiers among the plurality of transmission device identifiers in the first transmission data. And the control part 13 produces the 2nd transmission data which added the transmission power identifier to the 1st transmission data as mentioned above, and the transmission part 14 transmits the 1st message | telegram containing 2nd transmission data to the distance determination apparatus 20. FIG. .

  In such an aspect, the reception setting unit 21 sets a plurality of transmission device identifier change rules for identifying one transmission device 10. Thereby, the display part 25 displays the transmission apparatus identifier before the transmission data creation part 12 of the transmission apparatus 10 specified according to the change rule changes.

  On the other hand, when the transmission data creation unit 12 changes the transmission device identifier included in the first transmission data according to an arbitrary rule, the other devices include a plurality of different transmission device identifiers from the same transmission device 10, respectively. Receive the first message. At this time, another device recognizes that a plurality of first telegrams have been received from a plurality of different transmission devices 10. That is, other devices cannot recognize that even if the transmitting devices 10 that transmitted the plurality of first electronic messages are the same. That is, as described above, the other devices cannot correct the radio field intensity, and thus erroneously determine the distance to the transmitting device 10 that transmitted each of the plurality of first electronic messages. Therefore, even if one transmitter 10 is stationary, the other devices recognize that a plurality of transmitters 10 are moving. As described above, it can be made more difficult for another device to correctly determine the distance from the other device to the transmitting device 10.

  Although the above embodiment has been described as a representative example, it will be apparent to those skilled in the art that many changes and substitutions can be made within the spirit and scope of the invention. Therefore, the present invention should not be construed as being limited by the above-described embodiments, and various modifications and changes can be made without departing from the scope of the claims.

DESCRIPTION OF SYMBOLS 1, 2 Distance determination system 10 Transmission apparatus 11 Transmission setting part 12 Transmission data creation part 13 Control part 14,37,43 Transmission part 15 1st time part 20,30 Distance determination apparatus 21,31 Reception setting part 22,32,41 , 51 Receiving unit 23, 33 Adjustment unit 24, 34 Distance determination unit 25, display unit 26 Second time unit 35 Own position report unit 36 Transmission data generation unit 40 Position determination device 42 Position determination unit 50 Display device 52 Display unit

Claims (8)

A distance determination system including a transmission device and a distance determination device that perform short-range wireless communication with each other,
The transmitting device is
A transmission data creation unit for creating first transmission data including a transmission device identifier for identifying the transmission device;
A controller that creates second transmission data in which a transmission power identifier for identifying power intensity is added to the first transmission data;
A transmitter that transmits the first telegram including the second transmission data with the power of the power intensity, and
The distance determination device includes:
A receiving unit that receives the first telegram from the transmitting device and acquires a radio field intensity of a radio wave indicating the first telegram;
An adjustment unit that calculates a radio field intensity correction value by correcting the radio field intensity based on a radio field intensity correction coefficient corresponding to the transmission power identifier included in the first telegram;
A distance determination unit that determines a distance from the distance determination device to the transmission device based on the radio field intensity correction value;
A distance determination system comprising: a display unit configured to display the distance determined by the distance determination unit and the transmitting device identifier included in the first electronic message. The control unit adds one transmission power identifier among the plurality of transmission power identifiers to the first transmission data,
The distance determination system according to claim 1, wherein the transmission unit transmits the first telegram with the power having the power intensity corresponding to the one transmission power identifier. The transmitting device includes the transmission power identifier, the number of times or time when the transmission power identifier is continuously added to the first transmission data, the order in which the transmission power identifier is added, and the power intensity corresponding to the transmission power identifier. A transmission setting unit for setting transmission setting information including a plurality of combinations of
The control unit creates the second transmission data in which the one transmission power identifier is added to the first transmission data in the number of times or the time and in the order,
The distance determination device further includes a reception setting unit that sets reception setting information including a plurality of the transmission power identifiers and a radio wave intensity correction coefficient that is a reciprocal of the power intensity corresponding to each of the transmission power identifiers,
The distance determination system according to claim 2, wherein the adjustment unit corrects the radio wave intensity using a radio wave intensity correction coefficient corresponding to the one transmission power identifier included in the first telegram. The transmitting device further includes a first time unit that sets a time and a transmission power identifier correspondingly,
The transmitting unit transmits the first telegram with power of power intensity corresponding to a transmission power identifier set corresponding to a current time,
The distance determination device further includes a second time unit that sets a time and a transmission power identifier correspondingly,
The said adjustment part correct | amends the said radio field intensity with the radio field intensity correction coefficient corresponding to the transmission power identifier set corresponding to the time which received the said 1st message | telegram from the said transmitter. Or the distance determination system of 2. The arbitrary field of the first telegram includes a radio field intensity field having a value indicating a relationship between the distance and the radio field intensity.
The distance determination system according to any one of claims 1 to 4, wherein the adjustment unit corrects the radio wave intensity using a value of the radio wave intensity field. The distance determination device includes a reception setting unit that sets a change rule of the transmission device identifier,
The transmission data creation unit changes the transmitting device identifier according to the change rule,
The distance determination according to any one of claims 1 to 5, wherein the display unit displays the transmitting device identifier specified by the change rule before the transmission data creation unit changes. system. A distance determination system comprising a transmission device, a plurality of distance determination devices that perform short-range wireless communication with the transmission device, and a position determination device that receives information from the distance determination device,
The transmitting device is
A transmission data creation unit for creating first transmission data including a transmission device identifier for identifying the transmission device;
A controller that creates second transmission data in which a transmission power identifier for identifying power intensity is added to the first transmission data;
A transmission unit that transmits the first telegram including the second transmission data to the position determination device with the power of the power intensity,
Each of the plurality of distance determination devices includes:
A receiving unit that receives the first telegram from the transmission unit of the transmitting device and acquires a radio field intensity of a radio wave indicating the first telegram;
An adjustment unit that calculates a radio field intensity correction value by correcting the radio field intensity based on a radio field intensity correction coefficient corresponding to the transmission power identifier included in the first telegram;
A distance determination unit that determines a distance from the distance determination device to the transmission device based on the radio field intensity correction value;
A transmission unit that transmits to the position determination device a second message including own position information indicating the position of the own device and distance information indicating the distance;
The position determination device includes:
A receiver that receives the second telegram from the transmitter of each of the plurality of distance determination devices;
A position determination unit that determines the position of the transmission device based on the own position information and the distance information included in each of the plurality of second messages;
Distance determination comprising: a transmission unit that transmits position information indicating the position of the transmission device determined by the position determination unit and the transmission device identifier included in the second telegram to a display device. system. A distance determination method executed by a transmission device and a distance determination device that perform short-range wireless communication with each other,
The transmitting device is
Creating first transmission data including a transmitting device identifier for identifying the transmitting device;
Creating second transmission data in which a transmission power identifier for identifying power intensity is added to the first transmission data;
Transmitting a first telegram containing the second transmission data with power of the power intensity, and
The distance determining device is
Receiving the first telegram from the transmitting device and obtaining radio field intensity of a radio wave indicating the first telegram;
Calculating a radio field intensity correction value by correcting the radio field intensity based on a radio field intensity correction coefficient corresponding to the transmission power identifier included in the first telegram;
Determining a distance from the distance determining device to the transmitting device based on the radio field intensity correction value;
Displaying the distance and the transmitting device identifier included in the second transmission data.

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