JP2012229957A - Portable electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable electronic device capable of highly accurately identifying the position of another communication terminal.SOLUTION: Problem is solved by executing a predicted position calculation process including: calculating a first distance between a target communication terminal and a reference communication terminal by means of communication by a communication part via a reference communication terminal or of communication by a short-range communication part; calculating a second distance between a reference communication terminal and a portable electronic device (a subject device) by means of communication by the communication part communicating with the reference communication terminal; calculating a third distance between the target communication terminal and the subject device by means of communication by the short-range communication part; detecting a direction of the reference communication terminal existing relatively to the subject device on the basis of positional information obtained by a positional information acquisition part and positional information of the reference communication terminal; and detecting the position of the target communication terminal on the basis of the direction of the reference communication terminal existing relatively to the subject device and either one of a triangle formed by the first, second and third distances and a circle contacting all corners of the aforementioned triangle.

Description

  The present invention relates to a portable electronic device having a communication function.

  In recent years, mobile phone terminals such as mobile phones have various functions. For example, Patent Document 1 describes a portable electronic device having a navigation function for specifying its own position using a signal output from a GPS satellite, acquiring map information, and performing route guidance. Patent Document 2 describes a portable electronic device that acquires position information acquired by another communication terminal using a signal output from a GPS satellite using a communication function. The portable electronic device described in Patent Literature 2 can identify the position of another communication terminal by acquiring the position information of another communication terminal, and find a person who has another communication terminal. it can.

JP 2005-345115 A JP 2003-227868 A

  However, as described in Patent Document 2, since the GPS signal output from the GPS satellite has a weak radio wave intensity, the position information may not be acquired in an environment where the sky is not visible. In addition, the portable electronic device can detect the position by transmitting and receiving radio waves to and from the base station that performs communication. However, since the range that can be specified is wide, position detection accuracy is low.

  This invention is made | formed in view of the above, Comprising: It aims at providing the portable electronic device which can pinpoint the position of another communication terminal with higher precision.

  In order to solve the above-described problems and achieve the object, the present invention is a portable electronic device that acquires relative position information between the device itself and a target communication terminal, and communicates with a reference communication terminal that does not move at a predetermined position. A communication unit that communicates with the target communication terminal, a position information acquisition unit that acquires position information of the own device, and communication via the reference communication terminal in the communication unit or the near field communication A first distance between the target communication terminal and the reference communication terminal is calculated by communication at a communication unit, the communication unit communicates with the reference communication terminal, and a second distance between the reference communication terminal and the own device is calculated. The third distance between the target communication terminal and the own device is calculated by communication in the short-range communication unit, and the own device is determined based on the position information acquired by the position information acquisition unit and the position information of the reference communication terminal. Detecting the direction of the reference communication terminal , Either the triangle formed by the first distance, the second distance, and the third distance or a circle that contacts all corners of the triangle, and the direction in which the reference communication terminal is located with respect to the own device And a control unit that executes a predicted position calculation process for detecting the position of the target communication terminal based on the above.

  Here, the reference communication terminal is preferably a base station.

  Further, it is preferable that a movement detection unit that detects the movement of the own device is further provided, and the control unit executes the predicted position calculation process again when the movement detection unit detects the movement of the own device.

  In addition, the control unit may detect two predicted positions that satisfy the condition in the predicted position calculation process, and set a detection result in which the absolute position does not change even if the own device moves as the position of the target communication terminal. preferable.

  Moreover, it is preferable that the said movement detection part contains the acceleration sensor which detects the acceleration which acts on an own machine.

  In addition, the image processing apparatus further includes a display unit that displays an image, and the control unit detects two predicted positions that satisfy the condition in the predicted position calculation process as the positions of the target communication terminal, and detects two locations that are detected as the own device. It is preferable to display an area surrounded by the predicted position on the display unit.

  Moreover, it is preferable that the said positional information acquisition part acquires positional information based on the GPS signal output from a GPS satellite.

  The portable electronic device according to the present invention has an effect that the position of another communication terminal can be specified with higher accuracy.

FIG. 1 is an explanatory diagram showing a schematic configuration of a communication system having a mobile phone terminal of the present invention. FIG. 2 is a front view showing the appearance of the mobile phone terminal. FIG. 3 is a block diagram showing a schematic configuration of functions of the mobile phone terminal. FIG. 4 is an explanatory diagram for explaining the search operation of the mobile phone terminal. FIG. 5 is an explanatory diagram for explaining the search operation of the mobile phone terminal. FIG. 6 is a flowchart showing an example of processing at the time of photographing operation of the mobile phone terminal.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following description. In addition, constituent elements in the following description include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. In the following, a mobile phone terminal will be described as an example of a mobile electronic device. However, the application target of the present invention is not limited to a mobile phone terminal, and various devices having a communication function, for example, PHS (Personal Handy-phone) System), PDA, portable navigation device, game machine, and the like.

  FIG. 1 is an explanatory diagram showing a schematic configuration of a communication system of the present invention having a mobile phone terminal of the present invention. A communication system 1 shown in FIG. 1 includes a GPS satellite 2, a communication network 3, a plurality of base stations 4, a server 6, and a plurality of mobile phone terminals 10, 101, and 102.

  The GPS satellite 2 is a satellite that transmits (provides) position information of the communication device to a communication device (communication terminal or communication device) having a GPS (Global Positioning System) communication function. Although only one GPS satellite 2 is shown in FIG. 1, the number of GPS satellites 2 (mainly three and four) necessary for specifying the position of the communication device is arranged. The plurality of GPS satellites 2 output GPS signals (position information and time information of the GPS satellites 2) necessary for specifying the position information of the communication device. The communication device acquires its own position information by acquiring and analyzing the GPS signal output from the GPS satellite 2. The analysis may be performed by the communication device itself or may be performed by the external server 6.

  The communication network (core network) 3 includes an exchange, a wired or wireless communication line. The communication network 3 uses a wired or wireless communication line, and the mobile phone terminals 10, 101, 102 and other communication devices (other mobile phone terminals, fixed communication devices, servers 6) via the base station 4. ). The communication network 3 can use various communication methods as long as communication can be performed between communication devices. For example, communication may be performed using a satellite line.

  The base station 4 is a communication device that transmits and receives communication signals to and from the mobile phone terminals 10, 101, and 102 by radio. The communication signal is a signal of data to be transmitted / received in order to perform a call, mail transmission / reception, or Internet communication. The base station 4 is connected to the communication network 3 and can communicate (transmit / receive communication signals) with a communication terminal connected to the communication network 3. In this way, the base station 4 is connected to the communication network 3 and communicates wirelessly with the mobile phone terminals 10, 101, 102, thereby allowing the mobile phone terminals 10, 101, 102 using the communication network 3 to communicate. Relay communication. Note that the base station 4 may communicate with the mobile phone terminals 10, 101, 102 via the relay station.

  The server 6 has various data such as ringing tone and ringing tone information, ringing tone and ringing tone control conditions, control programs for these, and information (telephone number, address) for identifying each communication device. The server 6 communicates with the mobile phone terminals 10, 101, 102 via the communication network 3 and the base station 4 and supplies various information. The server 6 also receives information from the communication device and communicates information to other communication devices based on the information, and also relays information.

  The mobile phone terminals 10, 101, and 102 are communication terminals that perform wireless communication with the communication network 3 via the base station 4. The mobile phone terminals 10, 101, 102 transmit signals such as audio signals to the communication network 3 and receive signals such as audio signals from the communication network 3. Each mobile phone terminal 10, 101, 102 is assigned and stored with a unique telephone number and terminal number. The configuration of the mobile phone terminals 10, 101, 102 will be described later.

  The communication system 1 is configured as described above. In the communication system 1, for example, when a call operation is input to the mobile phone terminal 10 by a user operation, the call signal and the information of the communication destination telephone number are sent from the mobile phone terminal 10 to the communication network 3. The communication network 3 searches for another mobile phone terminal to which the inputted communication destination telephone number is assigned, and notifies the other mobile phone terminal of the communication destination of the incoming call. Thereafter, when an operation for starting a call is input at another mobile phone terminal as a communication destination, communication is performed via the communication network 3. That is, the communication system 1 performs communication between the mobile phone terminal 10 and another mobile phone terminal by transmitting and receiving information via the communication network 3. In the communication system 1, communication between communication terminals is not limited to voice communication, and also transmits and receives data. The same applies to the mobile phone terminals 101 and 102. Further, the mobile phone terminal 10 constituting the communication system 1 can also acquire position information from the GPS satellite 2. 1 shows only one server 6 and only three mobile phone terminals (10, 101, 102), the communication system 1 includes a large number of servers 6 and mobile phone terminals. 10 can be configured. In FIG. 1, only the cellular phone terminals 10, 101, and 102 and the server 6 are shown as devices that communicate with the communication network 3 of the communication system 1, but devices that can communicate with the communication network 3 include It is not limited. The communication system 1 can execute communication between various communication devices that can communicate on the public communication network via the communication network 3. For example, communication can be executed with a fixed information terminal having an information communication function such as a PC (Personal Computer) or a telephone device (fixed telephone) connected to the communication network 3 via a wired telephone line.

  Next, the mobile phone terminals 10, 101, 102 will be described. Although the mobile phone terminal 10, the mobile phone terminal 101, and the mobile phone terminal 102 have different housing shapes, the internal configuration is basically the same device configuration. Hereinafter, description will be given using the mobile phone terminal 10.

  FIG. 2 is a front view showing an external appearance of a mobile phone terminal 10 which is an embodiment of the mobile electronic device of the present invention. The mobile phone terminal 10 has a thin plate-like casing 11. In the mobile phone terminal 10, a touch panel 12, an input unit 13 including a button 30, a button 32, and an input device 34, a receiver 17, and a microphone 18 are arranged on the surface of the housing 11. The touch panel 12 is disposed on the surface having the widest area of the plate-shaped housing 11. The input unit 13 is also disposed at one end in the longitudinal direction of the surface of the housing 11 on which the touch panel 12 is disposed. The input unit 13 is arranged in the order of the button 30, the input device 34, and the button 32 from one side in the short side direction to the other side. The receiver 17 is arranged at the other end in the longitudinal direction of the surface on which the touch panel 12 of the housing 11 is arranged, that is, at the end opposite to the end where the input unit 13 is arranged. Yes. The microphone 18 is disposed at one end in the longitudinal direction of the surface of the housing 11 where the touch panel 12 is disposed, that is, the end where the input unit 13 is disposed.

  The touch panel 12 displays characters, figures, images, and the like, and is performed on the touch panel 12 using a finger, a stylus, a pen (a tip of a pen, a tip of a rod-like member) or the like (hereinafter simply referred to as “finger”). Detect various actions. For example, the mobile phone terminal 10 displays a virtual keyboard on the touch panel 12 in order to accept input of characters from the user. The mobile phone terminal 10 detects various operations input to the touch panel 12 with a finger in a state where the virtual keyboard is displayed on the touch panel 12, detects which key of the virtual keyboard is pressed or touched, Character input can be performed by using a key that has been detected as pressed or touched as an input key. Moreover, the touch panel 12 detects the input of various operations based on the displayed image and various operations performed on the touch panel 12 with a finger regardless of the input of characters, and based on the input operations. Various controls.

  When the buttons 30 and 32 are pressed, the input unit 13 activates a function corresponding to the pressed button. The input unit 13 also detects an operation input to the input device 34 as an operation, and performs various controls based on the input operation. For example, the input device 34 detects a direction instruction operation or a determination operation. The input device 34 includes a touch pad, an optical input device, an input device having buttons on all sides and the center, and the like.

  Next, the relationship between the function of the mobile phone terminal 10 and the control unit will be described. FIG. 3 is a block diagram showing a schematic configuration of functions of the mobile phone terminal 10 shown in FIG. As shown in FIG. 3, the mobile phone terminal 10 includes a touch panel 12, an input unit 13, a power supply unit 15, a communication unit 16, a receiver 17, a microphone 18, a storage unit 19, a main control unit 20, A RAM (Random Access Memory) 21, a short-range communication unit 24, a GPS unit 26, and an acceleration sensor 28 are included.

  The touch panel 12 includes a display unit 12B and a touch sensor 12A superimposed on the display unit 12B. The touch sensor 12 </ b> A detects various operations performed on the touch panel 12 using a finger together with a position on the touch panel 12 where the operation is performed. The operations detected by the touch sensor 12 </ b> A include an operation of bringing a finger into contact with the surface of the touch panel 12, an operation of moving a finger while being in contact with the surface of the touch panel 12, and an operation of moving the finger away from the surface of the touch panel 12. It is. Note that the touch sensor 12A may employ any detection method such as a pressure-sensitive method or an electrostatic method. The display unit 12B includes, for example, a liquid crystal display (LCD), an organic EL (Organic Electro-Luminescence) panel, and the like, and displays characters, figures, images, and the like.

  The input unit 13 includes the buttons 30 and 32 and the input device 34 as described above. The buttons 30 and 32 receive a user operation through physical input (pressing), and transmit a signal corresponding to the received operation to the main control unit 20. The input device 34 also accepts user operations and transmits a signal corresponding to the accepted operations to the main control unit 20.

  The power supply unit 15 supplies power obtained from a storage battery or an external power supply to each functional unit of the mobile phone terminal 10 including the main control unit 20. The communication unit 16 establishes a radio signal line by the CDMA method or the like with the base station 4 through a channel assigned by the base station 4, and performs telephone communication and information communication with the base station 4. The receiver 17 outputs the other party's voice, ringtone, and the like in telephone communication. The microphone 18 converts a user's voice into an electrical signal.

  The storage unit 19 is, for example, a nonvolatile memory or a magnetic storage device, and stores programs and data used for processing in the main control unit 20. Specifically, the storage unit 19 detects the position of a mail program 19A for sending / receiving and browsing mail, a browser program 19B for browsing a WEB page, and a target communication terminal (target mobile phone terminal). Search program 19C, short-range communication program 19D for transmitting / receiving information to / from other communication terminals including the target communication terminal (target mobile phone terminal) using the short-range communication unit 24, and various types of acquired information A distance measurement program 19E that calculates a distance based on the information and a processing condition table 19F that associates various conditions used when executing various programs are stored. The storage unit 19 also stores an operating system program that realizes basic functions of the mobile phone terminal 10 and other programs and data such as address book data in which names, telephone numbers, and mail addresses are registered. The The storage unit 19 also stores a program for determining a control operation and processing based on an input operation input to the touch panel 12. The control operations and processes include various operations and processes executed by the mobile phone terminal 10, for example, cursor, pointer movement, screen display switching, character input process, various application activation processes, and termination processes. is there.

  The main control unit 20 is, for example, a CPU (Central Processing Unit), and comprehensively controls the operation of the mobile phone terminal 10. Specifically, the main control unit 20 executes the program stored in the storage unit 19 while referring to the data stored in the storage unit 19 as necessary, so that the touch panel 12, the input unit 13, Various processes are executed by controlling the communication unit 16, the short-range communication unit 24, and the like. The main control unit 20 expands the program stored in the storage unit 19 and the data acquired / generated / processed by executing the process to the RAM 21 that provides a temporary storage area as necessary. Note that the program executed by the main control unit 20 and the data to be referenced may be downloaded from the server device by wireless communication by the communication unit 16.

  The short-range communication unit 24 is a communication unit (information communication unit) that communicates with other communication terminals (other mobile phone terminals) using a short-range wireless communication technology. As short-range wireless communication technologies, infrared communication (IrDA (registered trademark), IrMC (registered trademark), IrSimple (registered trademark)), visible light communication, Bluetooth (registered trademark), magnetic field communication (RFID, Radio Frequency Identification) technology can be used.

  The GPS unit 26 is a communication unit that receives a GPS signal transmitted from the GPS satellite 2. Further, the GPS unit 26 calculates the latitude and longitude of the mobile phone terminal 10 from the received GSP signal, and sends information on the calculated latitude and longitude to the main control unit 20. Specifically, the GPS unit 26 acquires GPS signals from a plurality of GPS satellites 2, and each GPS satellite is determined according to the time difference between the time information included in the GPS signals and the acquired time information, the intensity of the received radio waves, and the like. The distance from 2 is calculated. The GPS unit 26 calculates its own position by analyzing the distance from the GPS satellite 2 and the position information of each GPS satellite 2.

  The acceleration sensor 28 is a detector that detects acceleration applied to the housing 11. Here, as the acceleration sensor 28, a detector that detects acceleration by various methods can be used. For example, detection that detects acceleration by a change in capacitance, a change in piezoresistance, a change in relative position, or the like. Can be used. The acceleration sensor 28 detects the direction of acceleration in addition to the magnitude of acceleration. The acceleration sensor 28 detects acceleration acting on the housing 11 when the operator moves or shakes the housing 11, and sends the detected acceleration information to the main control unit 20. The main control unit 20 analyzes the detection result of the acceleration sensor 28, and specifically calculates the change in the attitude of the casing 11 by integrating the detected acceleration information. 11) The movement is detected. A geomagnetic sensor may be used for specifying the moving direction.

  Next, an example of a search operation executed by the mobile phone terminal 10 when the user searches for another communication terminal using the mobile phone terminal 10 will be described with reference to FIGS. 4 to 6. FIG. 4 is an explanatory diagram for explaining the search operation of the mobile phone terminal. FIG. 5 is an explanatory diagram for explaining the search operation of the mobile phone terminal. FIG. 6 is a flowchart showing an example of processing at the time of photographing operation of the mobile phone terminal. 4 and 5 show a case where the mobile phone terminal 101 is searched for as another communication terminal.

  First, the user uses the mobile phone terminal 10 to specify the mobile phone terminal 101 to be searched by communication using the short-range communication unit 24 or the communication unit 16. In addition, the user acquires rough position information using information on the base station used by the mobile phone terminal 101 and GPS information, and the mobile phone terminal 10 and the mobile phone terminal 101 communicate with the same base station 4. And move to a position where the short-range communication unit 24 can communicate. In addition, even if a user searches for an unspecified communication terminal, communicates with the same base station 4, and detects a communication terminal at a position where the short-range communication unit 24 can communicate as a target communication terminal. Good.

  When the mobile phone terminal 10 communicates with the same base station 4 as the mobile phone terminal 101 and becomes communicable with the short-range communication unit 24, as shown in FIG. ) And the mobile phone terminal 101 (target communication terminal), the distance L2 between the mobile phone terminal 10 and the base station 4, and the distance L3 between the mobile phone terminal 101 and the base station 4 are detected. Note that the distance difference between the distance L2 and the distance L3 is the distance L4. In addition, the mobile phone terminal 10 acquires direction information indicating in which direction the base station 4 is located with respect to the mobile phone terminal 10.

  Hereinafter, a method for detecting each information will be described. First, a method for detecting the distance L1 will be described. The mobile phone terminal 10 performs short-range communication with the mobile phone terminal 101 in the short-range communication unit 24, and calculates the distance L1. Specifically, the cellular phone terminal 10 transmits a distance measurement signal from the short-range communication unit 24, and further stores a time T1 at which the distance measurement signal is transmitted. Next, when the cellular phone terminal 101 receives the distance measurement signal, it transmits a reply signal. Note that the reply signal includes information on the time T2 at which the ranging signal is received and the time T3 at which the reply signal is transmitted. When a reply signal to the ranging signal transmitted from the mobile phone terminal 101 is received, the time T4 at which the reply signal is received is stored. Further, information on the time T2 when the distance measurement signal included in the reply signal is received and the time T3 when the reply signal is transmitted is stored. The mobile phone terminal 10 calculates the time (one-way required time) required for transmission of the signal between the mobile phone terminal 10 and the mobile phone terminal 101 by ((T4-T3) + (T2-T1)) / 2. The distance L1 is calculated by multiplying the calculated time by the speed of the signal (the speed of light).

  Further, the mobile phone terminal 10 can perform a synchronization process with the mobile phone terminal 101 based on the information for calculating the distance L1. Specifically, the mobile phone terminal 10 transmits to the mobile phone terminal 101 information on the time advanced by ((T4−T3) + (T2−T1)) / 2. The mobile phone terminal 101 synchronizes with the mobile phone terminal 10 by setting the received time to the current time.

  The above method can calculate the distance even when the time of the mobile phone terminal 10 and the mobile phone terminal 101 is not synchronized. If the time of the mobile phone terminal 10 and the mobile phone terminal 101 are synchronized, the mobile phone terminal 10 calculates the distance L1 from the time delay of the time information of the signal sent from the mobile phone terminal 101. be able to.

  In addition, when the mobile phone terminal 10 can acquire information on the signal processing time at the mobile phone terminal 101, the time taken to send a signal from the mobile phone terminal 10 to the mobile phone terminal 101 and receive the reply signal. By subtracting the signal processing time at the mobile phone terminal 101, the time required for the round trip of the signal can be calculated, and the distance L1 can be calculated from the round trip time. In this case, time synchronization is not necessary.

  Next, a method for detecting the distance L2 will be described. The mobile phone terminal 10 executes one of the processes similar to the method for calculating the distance L1 described above by communication with the base station 4 using the communication unit 16, and calculates the distance L2.

  A method for detecting the distance L3 will be described. The mobile phone terminal 10 communicates with the mobile phone terminal 101 by the short-range communication unit 24 or the communication unit 16 and acquires information on the distance L3. In this case, the mobile phone terminal 101 executes any one of the processes similar to the method for calculating the distance L1 described above in communication with the base station 4 using the communication unit 16, calculates the distance L3, and calculates the calculated distance. The L3 information is sent to the mobile phone terminal 10 by the short-range communication unit 24 or the communication unit 16.

  As another calculation method, the mobile phone terminal 10 acquires information on the time when the mobile phone terminal 101 receives an arbitrary signal (notification information or the like) from the base station 4 in a state in which the time is synchronized. The mobile phone terminal 10 calculates the difference L4 in the distance between the mobile phone terminal 10 and the mobile phone terminal 101 from the time difference between the time information acquired from the mobile phone terminal 101 and the time when the device receives the arbitrary signal. calculate. Thereafter, the mobile phone terminal 10 can also calculate the distance L3 by adding or subtracting the distance L4 to the distance L2.

  Next, a method for detecting direction information indicating in which direction the base station 4 is located with respect to the own device will be described. The mobile phone terminal 10 can calculate the direction information by calculating the position information of itself by the GPS unit 26 and comparing it with the position information of the base station 4. Note that the location information of the base station 4 may be acquired by communication via the communication unit 16. In addition, the mobile phone terminal 10 is not limited to calculating the position based on the information acquired by the GPS unit 26, and various methods for acquiring its own position information can be used. For example, the mobile phone terminal 10 communicates with a plurality of surrounding base stations 4 including a base station serving as a reference via the communication unit 16, and the location information of the communicable base stations 4 and the base station 4 The distance is calculated. The mobile phone terminal 10 can specify its own position based on the position information of the plurality of base stations 4 and the distance from the base station 4. The direction information only needs to be able to detect a direction within a predetermined range.

  The mobile phone terminal 10 acquires the position information of the target mobile phone terminal 101 using the distance L1, the distance L2, the distance L3, and the direction information. Specifically, as shown in FIG. 4, the mobile phone terminal 10 has a triangular shape composed of a base station 4, a mobile phone terminal 10, and a mobile phone terminal 101 using a distance L 1, a distance L 2, and a distance L 3. The shape is calculated, and the vertex angle θ1 of the triangular mobile phone terminal 10 is calculated. The mobile phone terminal 10 specifies the direction of the base station 4 with respect to the own device based on the direction information, and specifies two directions having an angle θ1 with respect to the direction. Thereafter, the mobile phone terminal 10 calculates a position at a distance L1 from the two specified directions as a predicted position where the mobile phone terminal 101 is located. One of the two predicted positions (two predicted positions) is a position where the mobile phone terminal 101 is not actually present, as indicated by the distance L1 ′, the distance L3 ′, and the mobile phone terminal 101 ′. The distance L3 ′ is the same distance as the distance L3.

  After performing the predicted position calculation process, the mobile phone terminal 10 performs the predicted position calculation process again when it is detected that the mobile phone terminal 10 has moved as indicated by the arrow 60 in FIG. The mobile phone terminal 10 can detect the movement of its own device by detecting the acceleration with the acceleration sensor 28. The mobile phone terminal 10a that has moved performs a predicted position calculation process, and calculates a distance L1a, a distance L2a, a distance L3, and direction information. Here, since the mobile phone terminal 101 is not moving, the distance L3 calculated by the mobile phone terminal 10a that has moved is the same distance as the distance L3 calculated by the mobile phone terminal 10 before movement.

  The mobile phone terminal 10a acquires the position information of the target mobile phone terminal 101 using the distance L1a, the distance L2a, the distance L3, and the direction information. Specifically, as shown in FIG. 5, the mobile phone terminal 10 has a triangular shape composed of the base station 4, the mobile phone terminal 10, and the mobile phone terminal 101 using the distance L 1 a, the distance L 2 a, and the distance L 3. The shape is calculated, and the vertex angle θ2 of the triangular mobile phone terminal 10 is calculated. The mobile phone terminal 10 specifies the direction of the base station 4 with respect to the own device based on the direction information, and specifies two directions having an angle θ2 with respect to the direction. Thereafter, the mobile phone terminal 10 calculates a position that is a distance L1a away from the two specified directions as a predicted position where the mobile phone terminal 101 is located.

  Here, one of the two predicted positions detected by the mobile phone terminal 10a is a position where the mobile phone terminal 101 is not actually present, as indicated by a distance L1a ′ and a distance L3a ′ mobile phone terminal 101a ′. The distance L3a ′ is the same distance as the distance L3. On the other hand, the other of the two predicted positions detected by the mobile phone terminal 10a is a position where the mobile phone terminal 101 is actually located. For this reason, of the two predicted positions detected at the position of the mobile phone terminal 10 and the position of the mobile phone terminal 10a, the predicted position where the mobile phone terminal 101 actually exists does not change in absolute position, and the mobile phone terminal The mobile phone terminal 101 ′ and the mobile phone terminal 101a ′, which are calculation positions without 101, are different positions.

  From the above relationship, the mobile phone terminal 10a specifies the predicted position where the absolute position does not change, that is, the relative position has changed the distance corresponding to the movement of the arrow 60 of the own device, as the position of the mobile phone terminal 101. When the mobile phone terminal 10a specifies the position of the mobile phone terminal 101, the mobile phone terminal 10a displays arrow information 62 indicating the position of the mobile phone terminal 101.

  Hereinafter, the processing operation of the mobile phone terminal 10 will be described with reference to FIG. The processing procedure shown in FIG. 6 is repeatedly executed based on the functions provided by the search program 19C, the near field communication program 9D, and the distance measurement program 9E. More specifically, the search program 9C provides based on various detection results acquired by the function (communication function) provided by the short-range communication program 9D, the function (distance detection function) provided by the distance measurement program 9E, and the like. Functions (search function, position detection function) are executed, and the position of the target communication terminal is detected. When an instruction to activate the search function is input, the mobile phone terminal 10 performs the process illustrated in FIG.

  The main control unit 20 of the mobile phone terminal 10 identifies the target terminal (target communication terminal) as step S12. As described above, the mobile phone terminal 10 may be a specific communication terminal as a target communication terminal, or may be any communication terminal detected during a search as a target communication terminal. After identifying the target terminal in step S12, the main control unit 20 starts near field communication in step S14. Specifically, the short-range communication unit 24 is activated and communication with a communicable target terminal is started. Note that the main control unit 20 may use the target terminal for which the near field communication function has already been activated as the communication partner or the target terminal for which the near field communication function is forcibly activated by itself.

  The main control part 20 will adjust conditions as step S16, if short-distance communication is started by step S14. The main control unit 20 sets various conditions used for searching for, for example, the intensity and frequency band of radio waves to be used, the timing of communication, and information on signals to be output. The main control unit 20 communicates with the target terminal and the base station, and sets these conditions. In addition, the main control unit 20 may perform a synchronization process for synchronizing the time among itself, the target terminal, and the base station.

  After adjusting the conditions in step S16, the main control unit 20 calculates the distance to the target terminal, that is, the distance L1 in step S17. Further, after calculating the distance L1 in step S17, the main control unit 20 detects the direction of the base station, that is, acquires direction information, in step S18. After acquiring the direction information in step S18, the main control unit 20 calculates the distance from the base station, that is, the distance L2 in step S20. After calculating the distance L2 in step S20, the main control unit 20 calculates the distance between the base station and the target terminal, that is, the distance L3, in step S22. The distance L1, the distance L2, the distance L3, and the direction information are calculated and detected by the various methods described above. Further, the order of the processes from step S17 to step S22 is not particularly limited.

  After performing the process of step S22, the main control unit 20 calculates two predicted positions (two predicted positions) as step S24. That is, two predicted positions specified based on the distance L1, the distance L2, the distance L3, and the direction information are calculated.

  After performing the process of step S24, the main control unit 20 determines whether there is a movement as step S26. Whether it is moving is determined from the detection result of the acceleration sensor 28. When determining that the main control unit 20 has not moved (No) in step S26, the main control unit 20 proceeds to step S26. That is, the main control unit 20 repeats the process of step S26 until it is determined that there is a movement.

  When determining that there is a movement (Yes) in Step S26, the main control unit 20 performs a predicted position calculation process as Step S28. The predicted position calculation process is a process from step S17 to step S24. When the predicted position calculation process is performed in step S28 and the two predicted positions after the movement are calculated, the main control unit 20 specifies a predicted position where the position does not change (move) in step S30. That is, the two predicted positions calculated in step S28 are compared with the two previously calculated predicted positions, and a predicted position where the absolute position has not changed is specified.

  After identifying the predicted position where the position does not change in step S30, the main control unit 20 notifies the position identified as step S32. That is, the main control unit 20 specifies the predicted position where the position specified in step S30 does not change as the position of the target terminal and notifies the user of it. The notification method is not particularly limited, but a method of displaying a map on the display unit 12B of the touch panel 12 to display a specified position on the map, a method of displaying an arrow toward the specified position on the display unit 12B, Information on the position specified by voice from the receiver 17, information on the relative relationship between the specified position and its own position, information on a movement route from the own position to the specified position, and the like may be output.

  The main control part 20 will determine whether it complete | finishes as step S34, if it alert | reports by step S32. The main control unit 20 proceeds to step S26 if it is determined not to end (No) in step S34, and ends this process if it is determined to end (Yes).

  Thus, the mobile phone terminal 10 detects the position of the target communication terminal by detecting the position of the target communication terminal using the relative relationship with the base station 4 through communication using the communication unit 16 and the short-range communication unit 24. The position of the communication terminal can be detected with high accuracy. That is, the mobile phone terminal 10 can detect the position with higher accuracy than when the position of the target communication terminal is specified from the communication state with a plurality of base stations, and can detect the position even in an environment where the GPS function cannot be used. can do. Specifically, even when the target communication terminal is inside a collapsed building during a disaster and the position cannot be specified using the GPS function, the user of the mobile phone terminal 10 can accurately determine the position of the target communication terminal. Can be detected. Thereby, the possibility that the user who possesses the target communication terminal can be rescued can be increased.

  In addition, the mobile phone terminal 10 according to the above-described embodiment performs the predicted position calculation process a plurality of times, and identifies one position where it is determined that there is a mobile phone terminal from two predicted positions, that is, determines that there is no mobile phone terminal. Although one predicted position is excluded, the present invention is not limited to this. For example, the mobile phone terminal 10 may specify and notify the two predicted positions as they are as the target communication terminal (mobile phone terminal 101). In addition, the mobile phone terminal 10 may notify a triangle formed by two predicted positions and the position of the own device as a search area. Thus, the user can narrow the search range also by notifying the two predicted positions and areas. Also, when moving closer to the target, the distance becomes shorter or the area of the area becomes smaller, and when moving away from the target, the distance becomes longer or the area of the area becomes larger. Can be easily identified by the user. In the above embodiment, the triangle formed by the first distance, the second distance, and the third distance is used. However, a circle that contacts all corners of the triangle may be used. Moreover, you may use the circle | round | yen which touches all the corner | angular parts of the triangle formed with an own position and two prediction positions.

  Further, although the mobile phone terminal 10 of the above embodiment calculates the distance between the own device, the target communication terminal, and the base station 4 and specifies the position, the mobile phone terminal 10 replaces the base station 4 and performs various other communications. The device can be used as a reference communication terminal. For example, the mobile phone terminal 10 can use another mobile phone terminal as a reference communication terminal instead of the base station 4. In this case, the other mobile phone terminal serving as the reference communication terminal is not moved from a certain place. As described above, the position of the symmetrical communication terminal can be specified by calculating the distance between the own device, the target communication terminal, and the other mobile phone terminal even by using another mobile phone terminal. . In addition, various communication terminals can be used as reference communication terminals as long as the communication terminals are not specified by other mobile phone terminals and can transmit and receive relative azimuth information and signals and can be moved from a predetermined position. Can be used.

DESCRIPTION OF SYMBOLS 10 Mobile phone terminal 11 Case 12 Touch panel 12A Touch sensor 12B Display unit 13 Input unit 15 Power supply unit 16 Communication unit 17 Receiver 18 Microphone 19 Storage unit 19A Mail program 19B Browser program 19C Search program 19D Short-range communication program 19E Distance measurement program 19F Processing condition table 20 Main control unit 21 RAM
24 Short-range communication unit 26 GPS unit 28 Acceleration sensor 30, 32 Button 34 Input device

Claims (7)

A portable electronic device that acquires relative position information between the own device and the target communication terminal,
A communication unit that communicates with a reference communication terminal that does not move at a predetermined position;
A near field communication unit capable of communicating with the target communication terminal;
A location information acquisition unit that acquires location information of the own device;
The communication unit calculates a first distance between the target communication terminal and the reference communication terminal by communication via the reference communication terminal or communication at the short-range communication unit, and the communication unit communicates with the reference communication terminal. Then, the second distance between the reference communication terminal and the own device is calculated, the third distance between the target communication terminal and the own device is calculated by communication at the short-range communication unit, and acquired by the position information acquisition unit Based on the position information and the position information of the reference communication terminal, the direction of the reference communication terminal is detected with respect to the own device, and the triangle formed by the first distance, the second distance, and the third distance or A predicted position calculation process is performed for detecting the position of the target communication terminal based on any one of the circles that contact all the corners of the triangle and the direction in which the reference communication terminal is located with respect to the own device. Having a control unit Portable electronic devices and features.   The portable electronic device according to claim 1, wherein the reference communication terminal is a base station. It further has a movement detection unit that detects the movement of its own machine,
3. The portable electronic device according to claim 1, wherein when the movement detection unit detects a movement of the own device, the control unit executes the predicted position calculation process again. 4. The control unit detects two predicted positions that satisfy a condition in the predicted position calculation process,
The portable electronic device according to claim 3, wherein a detection result in which the absolute position does not change even if the own device moves is set as the position of the target communication terminal.   The portable electronic device according to claim 3, wherein the movement detection unit includes an acceleration sensor that detects an acceleration acting on the device. A display unit for displaying an image;
The control unit detects, as the position of the target communication terminal, two predicted positions that satisfy a condition in the predicted position calculation process, and displays a region surrounded by the two predicted positions detected by the own device. The portable electronic device according to claim 1, wherein the portable electronic device is displayed.   The portable electronic device according to claim 1, wherein the position information acquisition unit acquires position information based on a GPS signal output from a GPS satellite.

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