JP5786527B2 - Radio and computer program - Google Patents

Description

  The present invention relates to a radio apparatus employing digital voice communication, and a computer program for realizing the functions of the radio apparatus.

  In recent years, for example, in the world of amateur radio, digitization and networking of voice communication are becoming widespread in order to realize higher-speed communication and enjoy communication with clear voice (see, for example, Patent Document 1). . In amateur radio digital voice communication, a voice signal is encoded, converted into a digital signal, packetized, and transmitted.

  Hereinafter, an amateur radio system adopting digital voice communication will be briefly described with reference to FIG.

  In the amateur radio system 100 shown in FIG. 6, a repeater 3 (3a, 3b) is installed for each area 2 (2a, 2b) covering a plurality of radio devices 1 (1a-1e). In the example of FIG. 6, the radio devices 1a, 1b, and 1c exist in the area 2a covered by the repeater 3a, and the radio devices 1d and 1e exist in the area 2b covered by the repeater 3b.

  Between adjacent repeaters 3a and 3b, voice and data are multiplexed using a microwave and transmitted. The service area connected by the repeaters 3a and 3b is called zone 5. A plurality of zones 5 (5a, 5b, 5c) are connected by the Internet 6 via the gateway 4.

  In the above-described amateur radio system 100, many voice audio signals have been packetized, and data indicating the transmission destination, the call sign of the transmission source, and the like are added to the header of the packet. The function of can be realized.

For example, by using the amateur radio system 100 of FIG. 6, various forms of communication as described below can be realized.
(1) Direct communication between the radios 1 in each area 2 (2) Communication via the repeater 3 between the radios 1 in each area 2 (3) Radio in different areas 2 in the same zone 5 Communication between repeaters 3 between devices 1 (4) Communication between gateways 4 between the wireless devices 1 in different zones 5 and the Internet 6

JP 2006-186816 A

  In an amateur radio system employing the above-described digital voice communication, it is necessary to specify a call sign of a destination and a source repeater together with a call sign of a destination and a source when starting communication.

  Therefore, when a wireless device is mounted on a moving body such as an automobile, the area to which the wireless device belongs is changed as the vehicle moves, so it is necessary to change the call sign of the sending repeater each time communication is performed. Regarding areas that move on a daily basis, it is known from experience which repeaters can communicate, and it is easy to select a repeater that can communicate during communication and set a call sign.

  However, when communicating at a place visited for the first time on a trip or business trip, it is difficult to easily know which repeaters can communicate at that place. For this reason, it is necessary to bring a comparison table between the address and the call sign of the area, or to check the call sign of the repeater at the place in advance using an Internet search tool or the like, which places a heavy burden on the user.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a radio device that can automatically acquire a call sign of a communicable repeater without imposing a burden on the user.

To achieve the above object, a radio apparatus according to the present invention converts an analog audio signal into A / D conversion and encoding to a digital audio signal, generates a packet including the digital audio signal, and converts the packet into a radio signal. A wireless device that converts and transmits to
As the packet, the header portion includes an identifier for identifying a transmission destination and a transmission source wireless device, and identifier data for identifying a repeater in an area to which the wireless devices belong, and the data portion includes the data of the digital audio signal. A transmitter that generates the included packets;
A controller for notifying the transmitter of the data of each identifier;
A memory storing a table including position information and identifier data of the repeaters installed at a plurality of locations;
A position information acquisition device that acquires information indicating the position of the transmitter radio,
Prior to communication, the controller
Compare the information indicating the current position of the transmission source radio obtained from the position information acquisition device with the position information of the repeater included in the table,
A plurality of repeater data close to the current position of the transmission source radio device are extracted from the table, a list including the repeater location information and identifier data is created, and the radio location information and the repeater are created. Calculating the distance between the radio and the repeater based on the position information of
The repeaters listed in the list are rearranged in order from the shortest distance to the transmission source radio device, and the identifier of the first repeater in the list is notified to the transmission unit as the identifier of the transmission source repeater. And

The wireless device according to the present invention further includes a receiving unit that demodulates the received wireless signal and extracts the packet, and the table further includes data on uplink and downlink frequencies of the repeater,
It said controller, from said table, retrieves the frequency of the uplink of the first repeater of the list and notifies the transmission unit, it is not preferable to notify the receiving unit takes out the frequency of the downlink.

In addition, when the controller cannot communicate with the first repeater in the list, the controller preferably notifies the transmitter of the identifier of the next repeater in the list as the identifier of the sender repeater .

  Furthermore, it is preferable to use a GPS receiver as the position information acquisition device, or to use a non-volatile memory as a memory for storing the table.

A computer program according to the present invention includes a computer including an identifier for identifying a transmission destination and a transmission source radio device in a header portion, and data for an identifier for identifying a repeater in an area to which these radio devices belong. digital to the transmitting unit which generates a packet containing data of the audio signal, a computer program to function as a controller for notifying the data of the respective identifier,
The controller is
Information indicating the current position of the position the transmission source radio obtained from location information acquisition device, compared with the position information of the table containing the data of the position information and the identifier of the repeater installed at a plurality of locations,
A plurality of repeater data close to the current position of the transmission source radio device are extracted from the table, a list including the repeater location information and identifier data is created, and the radio location information and the repeater are created. Calculating the distance between the radio and the repeater based on the position information of
The repeaters listed in the list are rearranged in order from the shortest distance to the transmission source radio device, and the identifier of the first repeater in the list is notified to the transmission unit as the identifier of the transmission source repeater. And

  In the wireless device of the present invention, a table including repeater position information and call sign is stored in the memory in advance, and the current position of the wireless device acquired by the position information acquisition device is compared with the position information of the repeater stored in the memory. By doing so, the call sign of the repeater in the area to which the wireless device belongs is selected. As a result, it is possible to automatically acquire a call sign of a repeater that is highly likely to be communicated without performing complicated operations by the user.

It is a block diagram which shows the structure of the radio | wireless machine concerning embodiment of this invention. It is a figure which shows the structure of the packet transmitted with a radio | wireless machine. It is a figure which shows an example of the table containing the positional information and call sign of a repeater stored in memory. It is a figure which shows the positional information on the receiver displayed on the screen of a display part. It is a flowchart explaining the procedure at the time of selecting the repeater of the area to which a radio | wireless machine belongs from the table stored in memory. It is a figure which shows the structure of the amateur radio | wireless system which employ | adopted the digital voice communication.

  Hereinafter, a wireless device according to an embodiment of the present invention will be described with reference to the drawings.

<Configuration of radio>
FIG. 1 shows a configuration of a wireless device according to the present embodiment that employs digital voice communication. The wireless device 1 includes a microphone 11, a speaker 12, an AF amplifier 13, an audio codec 14, a transmission unit 15, a transmission / reception switching unit 16, an antenna 17, a reception unit 18, an interface unit 19, a controller 21, an operation unit 26, and a display unit 28. It is configured. In the figure, thick arrows indicate the flow of audio signals and data, and thin arrows indicate the flow of signals in the control system.

  The microphone 11 receives the sound for transmission as an input, generates an analog sound signal, and outputs the sound signal to the AF amplifier 13. On the other hand, the speaker 12 converts the analog audio signal output from the AF amplifier 13 into audio.

  The AF (Audio Frequency) amplifier 13 amplifies the analog audio signal input from the microphone 11 and supplies it to the audio codec 14. Further, the analog audio signal of the received audio supplied from the audio codec 14 is amplified and output to the speaker 12.

  The audio codec 14 performs A / D (analog / digital) conversion and encoding on the analog audio signal supplied from the AF amplifier 13 and outputs the result to the transmission unit 15. The audio codec 14 also decodes the digital audio signal supplied from the receiving unit 18, further D / A (digital / analog) converts it, and outputs it to the AF amplifier 13.

  The transmission unit 15 attaches a wireless communication header to the digital audio signal supplied from the audio codec 14 and divides the digital audio signal based on an output of a PTT switch 27 described later to generate a transmission packet shown in FIG. The packet configuration will be described in detail later with reference to FIG. The transmission unit 15 further modulates a carrier wave with digital data constituting the packet, performs frequency conversion as necessary, and transmits the result from the antenna 17 via the transmission / reception switching unit 16.

  The transmission / reception switching unit 16 guides the transmission signal from the transmission unit 15 to the antenna 17 when the PTT switch 27 is pressed and turns on, and guides the reception signal of the antenna 17 to the reception unit 18 when the PTT switch 27 is released and turns off. .

  The receiving unit 18 switches the reception frequency in accordance with the instruction signal from the controller 21, amplifies the reception signal in synchronization with the reception frequency, further demodulates and reproduces the packet. Then, the header part is removed from the reproduced packet, the audio data is supplied to the audio codec 14, and the other data (for example, a packet conforming to Ethernet [registered trademark]) is supplied to the interface unit 19.

  The interface unit 19 is connected to a GPS (Global Positioning System) receiver 29 via an external connection terminal 20 and supplies a packet supplied from the GPS receiver 29 to the controller 21. The interface unit 19 supplies the Ethernet [registered trademark] -compliant packet supplied from the receiving unit 18 to an external device (for example, a personal computer) via the external connection terminal 20.

  In the present embodiment, the external GPS receiver 29 is used as the position information acquisition device. However, the GPS unit may be built in the wireless device 1 and the position information may be acquired from the GPS unit. . Further, the position information may be acquired from the link information of the Google map using a personal computer connected to the Internet. Further, the position information may be manually input from the operation unit 26 and stored in the RAM 24. In this case, it is not necessary to connect an external device.

  The controller 21 controls the operation of the wireless device 1. The controller 21 includes a CPU (Central Processing Unit) 22, a ROM (Read Only Memory) 23 that stores a program that defines the operation of the CPU 22, a RAM (Random Access Memory) 24 that functions as a work memory for the CPU 22, and a call sign of the repeater. And the like.

  The operation unit 26 transmits various inputs and user instructions to the controller 21. The operation unit 26 includes a PTT (Pres To Talk) switch 27. When the PTT switch 27 is pressed (turned on), the transmission / reception switching unit 16 is switched to the transmission side and transmission is performed from the antenna 17, and when released (turned off), the transmission / reception switching unit 16 is switched to the reception side and received. The audio signal is played back.

  The display unit 28 is composed of a liquid crystal display or the like, and is used to display various data. The screen of the display unit 28 displays that the wireless device 1 has received an amateur radio signal (that there has been a call), the call sign of the transmission source (own station) and the transmission destination (partner station), nickname, etc. The

<Packet configuration>
Next, the configuration of the packet generated by the transmission unit 15 will be described with reference to FIG. The packet configuration indicates how and in which order a series of data of digital voice communication is transmitted together.

  The packet Pa is composed of a header part Ph and a data part Pd. The header part Ph includes a synchronization signal h1, a flag h2, a call sign h3 of a destination repeater, a call sign h4 of a source repeater, a destination call sign h5, and a source call sign h6.

  In the header part Ph, the synchronization signal h1 is a signal indicating that the input signal is synchronized and is a signal. The flag h2 is data representing repeater communication, direct communication, a repeater control signal, and the like, and is composed of data of a plurality of bits.

  The call sign h3 of the destination repeater is, for example, the call sign of the repeater in the area to which the transmission destination radio belongs, and the call sign h4 of the transmission source repeater is the call sign of the repeater in the area to which the transmission source radio belongs. The transmission destination call sign h5 is the call sign of the transmitting station radio, and the transmission source call sign h6 is the call sign of the local station radio. These call signs (h3 to h6) serve as identifiers for identifying transmission destinations and transmission source radio apparatuses, as well as repeaters that relay radio signals. The destination call sign h5 may be a CQ that calls an unspecified station.

  In the data portion Pd, digitized audio frames d1 and data frames d2 including data such as small still images and memos are alternately arranged, and finally an end frame d3 indicating the end of the packet is added.

<Amateur radio communication operation>
Next, an amateur radio communication operation will be described with reference to FIGS. 1 and 2 and FIG. 6 described above. Hereinafter, as a typical case, a case where a station of the radio device 1a in an arbitrary area calls a station of the radio device 1d in a different area will be described.

  Prior to communication, the user operates the operation unit 26 of the wireless device 1a to store information necessary for communication, for example, the call sign of the transmission source (own station) and the transmission repeater in the nonvolatile memory 25. deep.

  At the time of communication, the user operates the operation unit 26 of the wireless device 1a, designates a call sign previously assigned to the wireless device 1d of the transmission destination and a call sign of the transmission destination repeater, and gives an instruction for calling.

  Information input from the operation unit 26 is notified to the transmission unit 15 by the controller 21, and a packet is generated by the transmission unit 15 in accordance with an instruction from the controller 21. As shown in FIG. 2, in the header part Ph of the packet Pa, the call sign h3 of the destination repeater 3b, the call sign h4 of the source repeater 3a, the call sign h5 of the radio 1d as the transmission destination (the partner station), and Each information of the call sign h6 of the wireless device 1a which is the transmission source (own station) is included.

  The packet Pa generated by the transmission unit 15 and converted into a radio signal is transmitted via the transmission / reception switching unit 16 and the antenna 17. The packet Pa transmitted from the wireless device 1a is relayed by the repeaters 3a and 3b on the designated route and reaches the wireless device 1d.

  The wireless signal received by the wireless device 1d is supplied to the receiving unit 18 via the antenna 17 and the transmission / reception switching unit 16, and demodulated by the receiving unit 18 to reproduce the packet Pa. Further, the header part Ph is removed from the packet Pa reproduced by the receiving unit 18 and supplied to the audio codec 14 or the interface unit 19 according to the contents of the data part.

  The audio data supplied to the audio codec 14 is decoded, further converted into an analog audio signal, and supplied to the AF amplifier 13. The audio signal amplified by the AF amplifier 13 is output from the speaker 12 to reproduce the voice of the transmission source user.

  The packet Pa reproduced by the receiving unit 18 is supplied to the controller 21. The CPU 22 of the controller 21 determines whether or not the received packet Pa is a valid packet by ECC (Error Check Code) check or the like.

  The CPU 22 stores the data of the header part Ph of the packet Pa determined to be valid in the RAM 24 and analyzes the information of the header part Ph. The CPU 22 displays the transmission destination call sign and the transmission source call sign of the received packet Pa on the display unit 28 based on the analysis result.

<Repeater call sign acquisition method>
Next, with reference to FIG. 3 and FIG. 4, a method for acquiring the call sign of the repeater in the area to which the radio belongs is described.

  As described above, when the user of the wireless device does not know the call sign of the repeater 3 in the area 2 to which the wireless device currently belongs, such as when the wireless device is mounted on a moving body such as an automobile, the user The call sign data of the repeater 3 is acquired using the position information acquired by the GPS receiver 29 and the data of the table stored in the nonvolatile memory 25 of the controller 21.

  FIG. 3 shows an example of the table T. The list-type table T includes six types of data D1 to D6. Data D1 is a name indicating the address of the place where the repeater 3 is installed. Data D2 is position information of the repeater 3, and includes data LAT indicating latitude and data LON indicating longitude. For example, the position information of the repeater installed in the A town is represented by (LAT1, LON1).

  Data D3 is a call sign given to each repeater. Data D4, D5, and D6 are data related to the frequency at which communication is performed between the repeater 3 and the wireless device 1, and D4 indicates a downlink frequency, that is, a transmission frequency from the repeater 3 to the wireless device 1. .

  On the other hand, the uplink frequency, that is, the transmission frequency from the wireless device 1 to the repeater 3 is calculated using the data D4, D5, and D6. Data D6 indicates a difference (offset) between the downlink frequency D4 and the uplink frequency, and data D5 indicates a direction in which the difference is shifted. When the data D5 is +, the value of the data D6 is added to the value of the data D4. When the data D5 is-, the frequency of the uplink is obtained by subtracting the value of the data D6 from the value of the data D4. .

  As shown in FIG. 3, the transmission / reception frequency of the repeater 3 is set so as to be shifted so as not to cause interference between adjacent repeaters. For example, the downlink frequency of the A town repeater shown in the first row of the table T is fd1 MHz, and the uplink frequency is (fd1 + Δd) MHz.

  On the other hand, the GPS sentence output from the GPS receiver 29 includes information indicating latitude and longitude. FIG. 4 is an example in which information DP indicating the current position of the wireless device 1 acquired by the GPS receiver 29 is displayed on the display unit 28. In the figure, “MY POSITION” indicates the position information of the transmitter radio 1a, “34 ° 37′000 ″ N” indicates the latitude, and “135 ° 36′000 ″ E” indicates the longitude. ing.

  The CPU 22 of the controller 21 creates a list of repeaters using the current position information DP of the wireless device 1a shown in FIG. 4 and the repeater installation position information D2 shown in FIG.

  Specifically, the CPU 22 compares the position information DP of the wireless device 1a with the latitude and longitude of the position information D2 of the repeater 3 of the table T, and a plurality of repeaters (for example, five locations) that are close to the wireless device 1a from the table T. A list (not shown) is created by extracting the data. Then, the distance between the wireless device 1a and the repeater 3 is calculated based on the position information DP and D2, and the data of the repeater 3 is rearranged in order of increasing distance. This list is temporarily stored in the RAM 24.

  Of the repeaters 3 listed, the repeater with the shortest distance to the radio device 1a is likely to be a repeater in the area to which the radio device 1a belongs, and therefore most likely to communicate with the radio device 1a. It can be judged. The CPU 22 selects a repeater that is closest to the wireless device 1 a from the list stored in the RAM 24 and notifies the transmission unit 15 of the call sign. The transmission unit 15 sets the call sign transmitted from the CPU 22 to the call sign of the sender repeater in the header part Ph and creates a packet.

  At the same time, the CPU 22 reads out the data of the repeater uplink and downlink frequencies (D4, D5 and D6 in FIG. 3) from the list, notifies the transmitter 15 of the uplink frequency, and the receiver 18 of the downlink frequency. Notify The transmission unit 15 sets the transmission frequency to the notified frequency, and the reception unit 18 sets the reception frequency to the notified frequency.

<Procedure for selecting a repeater in the area to which the transceiver belongs from the table>
Prior to communication, the user of the radio device 1a performs a process of reading the call sign and communication frequency of the repeater 3a in the area 2a to which the radio device 1a belongs from the nonvolatile memory 25. A procedure for selecting the repeater 3 in the area to which the wireless device 1a belongs from the table T stored in the nonvolatile memory 25 will be described with reference to the flowchart of FIG.

  The user operates the operation unit 26 to instruct the controller 21 to acquire call sign data of the repeater 3. The controller 21 acquires information (LAT, LON) indicating the current position of the wireless device 1a shown in FIG. 4 from the GPS receiver 29 connected to the wireless device 1a according to the user's instruction (step S1). Specifically, the controller 21 captures a packet including position information transmitted from the GPS receiver 29 via the interface unit 19 in accordance with an instruction signal from the operation unit 26, extracts the position information DP from the packet, and extracts the position information DP from the RAM 24 (see FIG. 1)) temporarily.

  Next, the controller 21 reads the list of the repeaters 3 from the table T stored in the nonvolatile memory 25 to the RAM 24, compares the position information of the repeaters 3 with the position information acquired from the GPS receiver 29, and sets the latitude LAT and longitude LON. Based on this, data of a plurality of adjacent repeaters 3 is extracted, and a list (not shown) is created (step S2).

  Subsequently, the controller 21 uses the position information (D2 in FIG. 3) of the repeater 3 listed in the list and the position information (DP in FIG. 4) of the wireless device 1a to determine the distance between the wireless device 1a and the repeater 3. The repeaters 3 are calculated and rearranged in order of increasing distance (step S3).

  When the calculation and rearrangement of distances are completed for all the repeaters listed in the list (Yes in step S4), the process proceeds to step S5. Otherwise (No in step S4), the process returns to step S3.

  The controller 21 selects the first repeater 3 in the list that has been rearranged, that is, the repeater with the shortest distance from the radio device 1a, and notifies the transmitter 15 of the call sign of the repeater (step S5). Further, the controller 21 reads out data on the frequency of the selected repeater from the list, notifies the transmitter 15 of the uplink frequency, and notifies the receiver 18 of the downlink frequency (step S5).

  Subsequently, the transmission unit 15 sets the transferred call sign in the packet as the call sign of the source repeater, and switches the transmission frequency to the notified uplink frequency (step S6). On the other hand, the receiving unit 18 switches the received frequency to the notified downlink frequency (step S7).

  After completing the preparation for communication in this way, the user of the wireless device 1 operates the PTT switch 27 to start communication with another station (step S8).

  As described above, the wireless device of the present invention stores a table including repeater position information and call sign in the memory in advance, and the current position of the wireless device acquired by the position information acquisition device is stored in the memory. By comparing with the position information of the repeater, the call sign of the repeater in the area to which the radio belongs is selected. As a result, it is possible to automatically obtain a call sign of a repeater having a high communication possibility without performing complicated operations by the user.

  Also, because the table contains data for the uplink and downlink frequencies of the repeater, the frequency is read and notified to the transmitter and receiver, so that the transmit frequency and the receive frequency are set to values corresponding to the repeater. It can be switched automatically.

  In the present embodiment, the caller of the first repeater on the list, that is, the repeater closest to the wireless device is notified to the transmission unit. May not be able to communicate with other repeaters. In such a case, communication with the repeater 3 can be reliably ensured by notifying the transmitter of the call sign of the repeater posted in the next line of the list. Further, the user may be allowed to select a repeater listed in the list without leaving it to the controller.

  In the present embodiment, the case where the wireless device is mounted on the mobile body has been described, but the present invention can also be applied to a semi-fixed station and a wireless device of a fixed station. In this case, when installing the radio device, if the GPS receiver is connected to acquire position information of the radio device, and then the GPS receiver is removed from the radio device, it is not necessary to always connect the GPS receiver. .

  In this embodiment, the data included in the table T is stored in the non-volatile memory so that the data is not lost when the radio is turned off. However, the data is stored in the RAM backed up by the battery. Also good.

  Further, a program for causing a computer to execute the function of the controller of the present embodiment may be recorded on a recording medium (for example, a CD-ROM) and distributed, or distributed over a network. The computer program is recorded and installed on a computer recording medium.

DESCRIPTION OF SYMBOLS 1 Radio | wireless machine 2, 2a, 2b Area 3, 3a, 3b Repeater 4 Gateway 5, 5a, 5b, 5c Zone 6 Internet 11 Microphone 12 Speaker 13 AF amplifier 14 Voice codec 15 Transmission part 16 Transmission / reception switching part 17 Antenna 18 Reception part 19 Interface unit 21 Controller 25 Non-volatile memory 26 Operation unit 27 PTT switch 28 Display unit 100 Amateur radio system Pa packet Ph Head unit Pd Data unit T Table D1-D6 Data DP Position information

Claims (6)

An analog audio signal is A / D converted and encoded to be converted into a digital audio signal, then a packet including the digital audio signal is generated, and the packet is converted into a radio signal and transmitted.
As the packet, the header portion includes an identifier for identifying a transmission destination and a transmission source wireless device, and identifier data for identifying a repeater in an area to which the wireless devices belong, and the data portion includes the data of the digital audio signal. A transmitter that generates the included packets;
A controller for notifying the transmitter of the data of each identifier;
A memory storing a table including position information and identifier data of the repeaters installed at a plurality of locations;
A position information acquisition device that acquires information indicating the position of the transmitter radio,
Prior to communication, the controller
Compare the information indicating the current position of the transmission source radio obtained from the position information acquisition device with the position information of the repeater included in the table,
A plurality of repeater data close to the current position of the transmission source radio device are extracted from the table, a list including the repeater location information and identifier data is created, and the radio location information and the repeater are created. Calculating the distance between the radio and the repeater based on the position information of
The repeaters listed in the list are rearranged in order from the shortest distance to the transmission source radio device, and the identifier of the first repeater in the list is notified to the transmission unit as the identifier of the transmission source repeater. A radio. A receiver that demodulates the received radio signal and extracts the packet;
The table further includes uplink and downlink frequency data of the repeater,
The controller extracts the uplink frequency of the first repeater in the list from the table and notifies the transmitter, and extracts the downlink frequency and notifies the receiver. The wireless device according to 1.   The said controller notifies the identifier of the next repeater of the said list | wrist to the said transmission part as an identifier of the sender repeater, when communication cannot be performed between the first repeaters of the said list | wrist. Or the radio | wireless machine of 2.   The radio device according to claim 1, wherein a GPS receiver is used as the position information acquisition device.   The wireless device according to claim 1, wherein a nonvolatile memory is used as a memory for storing the table. Computer
Identifier for identifying the destination and the transmission source radio to the header portion, and includes data identifier for identifying the repeater area that these radios belongs, the packet containing data of digital audio signal to the data unit A computer program that causes a transmission unit to generate to function as a controller that notifies the data of each identifier,
The controller is
Information indicating the current position of the position the transmission source radio obtained from location information acquisition device, compared with the position information of the table containing the data of the position information and the identifier of the repeater installed at a plurality of locations,
A plurality of repeater data close to the current position of the transmission source radio device are extracted from the table, a list including the repeater location information and identifier data is created, and the radio location information and the repeater are created. Calculating the distance between the radio and the repeater based on the position information of
The repeaters listed in the list are rearranged in order from the shortest distance to the transmission source radio device, and the identifier of the first repeater in the list is notified to the transmission unit as the identifier of the transmission source repeater. A computer program.

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