JP2011252721A - Positioning device and positioning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform positioning in the vicinity of the destination regardless of moving speed while positioning so as to suppress the amount of power consumption.SOLUTION: When the distance from the positioned current position to the destination exceeds the determined distance, a portable terminal calculates the moving speed from the current position to the destination, and calculates the moving time up to the destination from the calculated result and the distance up to the destination. The portable terminal stops positioning during the calculated moving time. When the distance up to the destination is less than the determined distance, the current position is periodically positioned.

Description

  The present invention relates to a technique for positioning a position.

  Patent Document 1 describes a mobile terminal that measures a position by GPS (Global Positioning System). This mobile terminal measures the current position by GPS, calculates a distance from a predetermined monitoring area to the current position, and determines a time for positioning the current position next based on the calculated distance. When the determined time is counted, the current position is measured again by GPS. Further, in Patent Document 2, after calculating the distance, the moving speed of the mobile terminal is obtained, and the current position is next measured based on the distance from the area set in a predetermined range to the current position and the moving speed. It is described to determine the time to do.

JP 2005-250853 A

  By the way, in the invention disclosed in Patent Document 1, positioning is stopped until the determined time elapses until the monitoring area is reached. For this reason, if the moving speed is increased after approaching the monitoring area, it may not be possible to immediately detect that the monitoring area has been reached.

  The present invention has been made under the above-described background, and an object of the present invention is to provide a technique capable of positioning a position near a destination regardless of a moving speed while performing positioning so as to suppress power consumption. And

  In order to solve the above-described problem, the present invention provides destination storage means for storing position information representing the position of the destination, positioning means for positioning the position of the own device, and the position determined by the positioning means. Distance calculating means for calculating the distance to the position of the position information stored in the destination storage means, position information indicating the position determined by the positioning means, and time information indicating the time when the position is determined If the distance calculated by the movement position storage means and the distance calculation means exceeds a predetermined distance, the positioning is based on the position information and time information stored in the movement position storage means. If the distance calculated by the distance calculating means exceeds a predetermined distance, the positioning means calculates the moving speed calculating means for calculating the moving speed of the own aircraft at the position determined by the means. Travel time calculation for calculating the travel time of the own device from the measured position to the position of the position information stored in the destination storage means from the calculation result of the distance calculation means and the calculation result of the movement speed calculation means Until the movement time calculated by the means and the movement time calculation means elapses, positioning by the positioning means is stopped, and when the movement time elapses, the positioning means performs positioning, and the distance calculation When the distance calculated by the means is equal to or less than a predetermined distance, a positioning device having a control means for causing the positioning means to periodically perform positioning is provided.

  In the present invention, the distance calculation means is configured to perform an operation of adding a positioning error of the positioning means to a distance from a position measured to a position of position information stored in the destination storage means. May be.

  In the present invention, there is provided a moving speed storage means for storing the position measured by the positioning means and the moving speed at the position in association with each other, and the moving speed calculation means is the moving speed storage means. The moving speed is an arithmetic average or weighted average of moving speeds associated with positions within a range determined from the position determined by the positioning means, and the moving speed storage means The moving speed obtained from the arithmetic mean or the weighted average and the position measured by the positioning means may be associated with each other and stored in the moving speed storage means.

  Further, in the present invention, there is provided a moving speed storing means for storing the position measured by the positioning means, the moving speed at the position, and the time when the moving speed is calculated in association with the moving speed. The calculating means is a movement associated with a position within a range determined from the position measured in the moving speed storage means and associated with a time within a range determined from the positioning time. An arithmetic average or a weighted average of speeds is set as the moving speed of the own device, and the moving speed storage means includes a moving speed obtained from the arithmetic average or the weighted average, a position measured by the positioning means, an arithmetic average or A configuration in which the time when the moving speed is obtained from the weighted average is stored in the moving speed storage unit in association with the time.

  In the present invention, the travel time calculating means may be configured such that when the travel time obtained by the calculation is outside a predetermined time range, the travel time is set to a time within the time range.

  The present invention also provides destination storage means for storing position information representing the position of the destination, first positioning means for positioning the position of the own apparatus, positioning the position of the own apparatus, and power consumption during positioning Is selected from the second positioning means, the first positioning means, and the second positioning means, and positioning is performed by the selected positioning means. Control means for performing the operation, distance calculation means for calculating the distance from the position measured by the positioning means selected by the control means to the position of the position information stored in the destination storage means, and the control Calculated by the distance calculation means, the position information indicating the position measured by the positioning means selected by the means, and the movement position storage means for storing the time information indicating the time when the position is measured in association with each other. The distance is the first If the positioning error is greater than the positioning error of the positioning means, based on the position information and time information stored in the moving position storage means, the movement of the own device at the position determined by the positioning means selected by the control means When the distance calculated by the moving speed calculating means for calculating the speed and the distance calculating means is equal to or larger than the positioning error of the first positioning means, the position determined by the positioning means selected by the control means is used. A movement time calculation means for calculating the movement time of the own machine to the position of the position information stored in the destination storage means from the calculation result of the distance calculation means and the calculation result of the movement speed calculation means; The control means selects the second positioning means when the calculation result of the distance calculation means is less than the positioning error of the first positioning means, and is calculated by the travel time calculation means. Until the movement time elapses, positioning by the selected positioning unit is stopped, and when the movement time elapses, the selected positioning unit performs positioning, and the distance calculation unit calculates When the distance is less than the error, a positioning device is provided that causes the selected positioning means to perform positioning periodically.

  Further, the present invention provides a destination storage step for storing position information representing the position of the destination, and position information stored in the destination storage means from a position measured by the positioning means for positioning the position of the own device. A distance calculating step for calculating the distance to the position, a moving position storing step for storing the position information indicating the position measured by the positioning means, and the time information indicating the time when the position is determined, in association with each other; When the distance calculated by the distance calculating step exceeds a predetermined distance, the own device moves at the position measured by the positioning means based on the position information and time information stored in the moving position storing step. If the distance calculated by the moving speed calculating step for calculating the speed and the distance calculating step exceeds a predetermined distance, positioning is performed by the positioning means. A moving time calculating step for calculating the moving time of the own machine from the position to the position of the position information stored in the destination storing step from the calculation result of the distance calculating step and the calculating result of the moving speed calculating step; Until the travel time calculated in the travel time calculation step elapses, positioning by the positioning unit is stopped, and when the travel time elapses, the positioning unit performs positioning, and is calculated by the distance calculation step. And a control step of causing the positioning means to periodically perform positioning when the distance is equal to or less than a predetermined distance.

  Further, the present invention provides a destination storage step for storing position information indicating the position of the destination, first positioning means for positioning the position of the own device, positioning the position of the own device, and power consumption during positioning Selected from the second positioning means having a larger positioning error than the first positioning means and a positioning error smaller than the first positioning means, and causing the selected positioning means to perform positioning, and selected in the control step. A distance calculating step for calculating a distance from the position measured by the positioning means to the position of the position information stored in the destination storing step, and a position measured by the positioning means selected by the control means. The position information to be represented and the time information representing the time when the position is measured are stored in association with each other, and the distance calculated by the distance calculating step is measured by the first positioning means. If the error is equal to or greater than the error, the moving speed of the own device at the position measured by the positioning means selected in the control step is calculated based on the position information and time information stored in the moving position storing step. When the distance calculated by the moving speed calculating step and the distance calculating step is equal to or larger than the positioning error of the first positioning means, the destination memory is stored from the position determined by the positioning means selected in the control step. A movement time calculation step for calculating the movement time of the own machine to the position of the position information stored in the step from the calculation result of the distance calculation step and the calculation result of the movement speed calculation step; When the calculation result of the distance calculation step is less than the positioning error of the first positioning means, the second positioning means is selected and the shift is performed. Until the movement time calculated by the time calculation step elapses, positioning by the selected positioning means is stopped, and when the movement time elapses, the selected positioning means performs positioning, and the distance When the distance calculated by the calculation step is less than the error, a positioning method is provided which causes the selected positioning means to perform positioning periodically.

  According to the present invention, positioning can be performed in the vicinity of the destination regardless of the moving speed while performing positioning so as to suppress the power consumption.

1 is a diagram illustrating an overall configuration of a communication system 1 according to an embodiment of the present invention. The figure which showed the hardware constitutions of the portable terminal. The block diagram which showed the structure of the function implement | achieved by running a positioning application. The figure which showed an example of the format of destination table TB1. The figure which showed an example of the format of speed table TB2. The figure which showed the hardware constitutions of the server apparatus. The figure which showed an example of the format of base station table TB3. The flowchart which showed the flow of the process which the portable terminal 10 performs. The figure which showed the hardware constitutions of 10 A of portable terminals. The block diagram which showed the structure of the function implement | achieved in 10 A of portable terminals. The flowchart which showed the flow of the process which 10A of portable terminals perform.

[First Embodiment]
(overall structure)
FIG. 1 is a diagram illustrating an overall configuration of a communication system 1 according to the first embodiment of the present invention. The mobile communication network 20 is a communication network compliant with IMT-2000 (International Mobile Telecommunication-2000) in this embodiment. The mobile communication network 20 includes a plurality of radio base stations 210A, 210B, and 210C that perform radio communication with the mobile terminal 10. The mobile terminal 10 is a mobile phone compliant with IMT-2000. The mobile terminal 10 communicates with a radio base station of the mobile communication network 20 to perform voice communication and data communication. Note that the mobile terminal 10 according to the present embodiment has a function of measuring the position of the mobile terminal 10 and is also a positioning device that measures the position. The server device 30 is connected to the mobile communication network 20 and performs data communication with the mobile terminal 10 via the mobile communication network 20. Note that the mobile communication network 20 has a large number of radio base stations, and there are many mobile terminals that can communicate with the radio base stations. However, in order to prevent the drawing from becoming complicated, the mobile terminal 10 in FIG. Only the radio base stations 210A, 201B, and 210C are shown.

(Configuration of mobile terminal 10)
FIG. 2 is a diagram illustrating a hardware configuration of the mobile terminal 10. As illustrated in FIG. 2, each unit of the mobile terminal 10 is connected to the bus 101. Each unit of the mobile terminal 10 exchanges information between the units via the bus 101.
The communication unit 108 functions as an interface that performs wireless communication. The communication unit 108 performs radio communication with a radio base station of the mobile communication network 20 via an antenna (not shown) connected to the communication unit 108 under the control of a CPU (Central Processing Unit) 102, and performs voice communication. Perform communication and data communication. When the communication unit 108 receives the signal transmitted from the radio base station, the communication unit 108 outputs a voice signal related to the voice communication to the call unit 109 and outputs information obtained by the data communication to the CPU 102. When the information output from the CPU 102 is input, the communication unit 108 transmits this information to the radio base station. When the audio signal output from the call unit 109 is input, the communication unit 108 transmits the audio signal to the radio base station. Send to the station.
The calling unit 109 has a microphone and a speaker (both not shown). When voice is input to the microphone, the call unit 109 outputs a voice signal representing the input voice to the communication unit 108. In addition, when an audio signal is input from the communication unit 108, the call unit 109 converts the audio signal into an analog signal and outputs the analog signal, and the audio is output from the speaker.

The display unit 107 includes a control circuit and a liquid crystal display panel for controlling the liquid crystal display panel. Under the control of the CPU 102, the liquid crystal display panel displays characters, a graphic screen, a menu screen for operating the mobile terminal 10, and the like. To display.
The operation unit 106 has a plurality of keys for operating the mobile terminal 10. When the user operates a key on the operation unit 106, a signal indicating the operated key is output from the operation unit 106 to the CPU 102. When a signal is input from the operation unit 106, the CPU 102 specifies the operated key based on the input signal, and controls each unit according to the operated key.

  The storage unit 105 has a non-volatile memory, and stores a basic program and a plurality of application programs that realize the function of the operating system. For example, the storage unit 105 calculates the distance from the measured position of the mobile terminal 10 to the target position set by the user, and realizes a function of notifying that the mobile terminal 10 has approached the destination set by the user A program (hereinafter referred to as a positioning application) is stored.

A ROM (Read Only Memory) 103 stores an IPL (Initial Program Loader). A RAM (Random Access Memory) 104 is used as a work area when the CPU 102 executes a program, and temporarily stores data used when the CPU 102 executes the program.
The CPU 102 is a device that controls each unit of the mobile terminal 10. When the mobile terminal 10 is turned on, the CPU 102 reads the IPL from the ROM 103 and executes it. After executing the IPL, the CPU 102 reads the basic program from the storage unit 105 and executes it. When the CPU 102 executes the basic program, a basic function as a mobile phone is realized, and the mobile terminal 10 can perform voice communication and data communication. Further, when the CPU 102 executes the basic program, a function for executing the application program is realized. For example, when the CPU 102 executes the positioning application described above, various functions illustrated in FIG. 3 are realized, and a function for notifying that the mobile terminal 10 has approached the destination set by the user is realized.

(Functional configuration of mobile terminal 10)
FIG. 3 is a block diagram illustrating a configuration of functions realized in the mobile terminal 10 by executing the positioning application.
The first positioning unit 150 measures the position of the mobile terminal 10 (own device) using information transmitted from the radio base station. From the radio base station of the mobile communication network 20, a base station identifier that is an identifier for uniquely identifying the radio base station is transmitted. When the base station identifier transmitted from the radio base station is received by the communication unit 108, the first positioning unit 150 controls the communication unit 108 to transmit the received base station identifier to the server device 30. When the position information transmitted from the server device 30 is received by the communication unit 108 as a response to the transmitted base station identifier, the first positioning unit 150 stores the position information in the moving position storage unit 155 described later. Note that the location information transmitted from the server device includes information on the latitude and longitude of the location where the wireless base station is located. The first positioning unit 150 sets the position specified by the latitude and longitude as the position of the mobile terminal 10.

The destination setting unit 152 sets the destination of the user who moves with the mobile terminal 10. In this embodiment, the destination setting unit 152 stores map information representing a map, and causes the display unit 107 to display a map screen based on the map information. When the operation unit 106 is operated by the user and a destination is designated on the map, position information indicating the position of the designated destination is stored in the destination storage unit 153.
The destination storage unit 153 stores position information indicating the position set by the destination setting unit 152. The destination storage unit 153 stores the latitude and longitude represented by the position information in the destination table TB1. FIG. 4 is a diagram showing an example of the format of the destination table TB1. The destination table TB1 has a “latitude” field and a “longitude” field, and stores information on the latitude and longitude of the destination. The destination table TB1 is stored in the storage unit 105.

The distance calculation unit 154 calculates a linear distance from the position of the mobile terminal 10 to the destination. Specifically, the distance calculation unit 154 calculates the distance from the position represented by the position information obtained by the first positioning unit 150 to the position represented by the position information stored in the destination storage unit 153.
The movement position storage unit 155 stores the position information obtained after the mobile terminal 10 starts positioning and date / time information indicating the date / time when the positioning is performed in association with each other. Each information is stored in the storage unit 105.

The movement speed calculation unit 156 calculates the movement speed of the mobile terminal 10. The movement speed calculation unit 156 calculates the movement speed of the mobile terminal 10 from the position information and date / time information stored in the movement position storage unit 155, and stores speed information indicating the movement speed obtained by the calculation in the movement speed storage unit 157. Remember.
The moving speed storage unit 157 associates the speed information obtained by the moving speed calculation unit 156, the position information obtained by the first positioning unit 150, and the information of the date and time when the speed information is calculated, and stores them in the speed table TB2. . FIG. 5 is a diagram showing an example of the format of the speed table TB2. The speed table TB2 has a “position information” field, a “movement speed” field, and a “date and time” field. Position information is stored in the “position information” field, and speed information is stored in the “movement speed” field. In the “date and time” field, information representing the date and time is stored, but only the time may be stored. The speed table TB2 is stored in the storage unit 105.

The movement time calculation unit 158 calculates the time required to move from the position measured by the first positioning unit 150 to the destination. The movement time calculation unit 158 is calculated by dividing the distance obtained by the distance calculation unit 154 by the speed obtained by the movement speed calculation unit 156. The travel time calculation unit 158 stores a lower limit and an upper limit of the travel time in advance, and when the travel time is below the lower limit, the lower limit time is set as the travel time, and when the travel time is above the upper limit, the upper limit time is set. It may be a travel time.
The determination unit 160 determines whether or not the mobile terminal 10 has approached the destination.
The clock unit 161 measures the date and time and generates date and time information representing the date and time.
The control unit 162 controls the first positioning unit 150 to cause the first positioning unit 150 to perform position positioning.

(Configuration of server device 30)
FIG. 6 is a block diagram illustrating a hardware configuration of the server device 30. As shown in FIG. 6, each unit of the server device 30 is connected to a bus 301, and exchanges data between each unit via the bus 301.

  The communication unit 308 is a communication interface for performing data communication. The communication unit 308 is connected to the mobile communication network 20 by a communication cable (not shown). The operation unit 306 has a keyboard (not shown) and a mouse (not shown) operated by the user. When the mouse or keyboard is operated, the operation unit 306 outputs a signal indicating the operated button or key to the CPU 302. The display unit 307 includes a liquid crystal display, and displays a character and graphic screen, a menu screen for operating the server device 30, and the like under the control of the CPU 302.

The storage unit 305 has a device (for example, a hard disk device) that permanently stores data, and stores a base station table TB3. FIG. 7 is a diagram showing an example of the format of the base station table TB3. The base station table TB3 has a “base station identifier” field, a “latitude” field, a “longitude” field, and an “error” field.
The “base station identifier” field stores a base station identifier that is information for uniquely identifying a radio base station. For example, when the base station identifier of the radio base station 210A is “36556933”, the base station identifier of “36565633” is stored as shown in FIG.
The “latitude” field stores information indicating the latitude at which the radio base station is located. For example, when the latitude of the radio base station 210A is north latitude a1 degree b1 minute c1 second, information “North latitude a1 degree b1 minute c1 second” is stored in the record “36556933” as shown in FIG. .
The “longitude” field stores information indicating the longitude of the position where the radio base station is located. For example, when the latitude of the radio base station 210A is east longitude d1 degrees e1 minutes f1 seconds, as shown in FIG. 7, information “east longitude d1 degrees e1 minutes f1 seconds” is stored in the record “36556933”. .
The “error” field stores the distance from the position of the radio base station to the boundary of the cell in the cell formed by the radio base station. For example, in the case of the radio base station 210A, when the range of the radius of 1 km from the position of the radio base station 210A is the cell range, “1 [km]” is stored in the “error” field in the record “36565633”. .
When the mobile terminal 10 performs positioning by the first positioning unit 150, the position of the radio base station is set as the position of the mobile terminal 10. In this case, the position of the radio base station and the position of the mobile terminal 10 are shifted by the distance stored in the “error” field at the maximum. In other words, it can be said that the value stored in the “error” field represents an error (positioning error) when the position of the mobile terminal 10 is measured by the base station identifier.

  In addition, the storage unit 305 stores a basic program for realizing the function of the operating system in the server device 30 and a plurality of application programs. For example, when the storage unit 305 receives a base station identifier, the application that realizes a function of transmitting position information and error information representing latitude and longitude stored in association with the received base station identifier to the mobile terminal 10 I remember the program.

  The ROM 303 stores the IPL. The RAM 304 is used as a work area when the CPU 302 executes a program. The CPU 302 is a device that controls each unit of the server device 30. When the server device 30 is powered on, the CPU 302 reads the IPL from the ROM 303 and executes it. After executing the IPL, the CPU 302 reads the basic program from the storage unit 305 and executes it. When the CPU 302 executes the basic program, the server device 30 functions as a server of the client server system and can perform data communication with the mobile terminal 10. When the CPU 302 executes the basic program, the application program stored in the storage unit 305 is executed, receives the base station identifier, and stores the latitude, longitude, and error stored in association with the received base station identifier. A function of transmitting information to the mobile terminal 10 is realized.

(Operation of the first embodiment)
Next, the operation of the mobile terminal 10 according to the present embodiment will be described. First, when the user performs an operation for instructing execution of the positioning application on the operation unit 106, the positioning application is executed, and each function illustrated in FIG. 5 is realized. Further, the realized destination setting unit 152 displays a map screen. Here, when the operation unit 106 is operated by the user and a destination is specified on the displayed map, position information indicating the specified position is stored in the destination storage unit 153 (FIG. 8: Step SA1). ).

When the location information of the destination is stored in the destination storage unit 153, the control unit 162 causes the first positioning unit 150 to perform positioning, and the first positioning unit 150 determines the position of the mobile terminal 10 (step) SA2).
Specifically, the base station identifier received by the communication unit 108 is transmitted to the server device 30 via the mobile communication network 20. When the base station identifier is received by the communication unit 308 of the server device 30, the CPU 302 searches the base station table TB3 for a base station identifier that matches the received base station identifier. When a base station identifier that matches the received base station identifier exists in the base station table TB3, the CPU 302 has “latitude” information and “longitude” information stored in the same record as the searched base station identifier. The position information and the “error” information stored in the same record are transmitted to the mobile terminal 10. When the information is received by the communication unit 108, the first positioning unit 150 associates the received position information with the error information and the date / time information generated by the clock unit 161 in the movement position storage unit 155. Store (step SA3).

Next, the distance calculation unit 154 determines the distance between the position represented by the position information stored in the movement position storage unit 155 and the position represented by the position information stored in the destination storage unit 153 (distance to the destination). ) Is calculated (step SA4).
When the calculation of the distance ends, the determination unit 160 determines whether or not the mobile terminal 10 has approached the destination. Specifically, the determination unit 160 determines whether or not the distance obtained by the distance calculation unit 154 is less than or equal to the error distance obtained in step SA2, and the distance obtained by the distance calculation unit 154 is less than or equal to the error distance. If there is, it is determined that the destination has been reached (YES in step SA5). Then, the display unit 107 is controlled by the CPU 102, and a screen for notifying that the destination is approached is displayed. Further, the calling unit 109 is controlled by the CPU 102, and a sound is emitted from the speaker to notify the user that the user has approached the destination (step SA6).

  On the other hand, if it is not determined that the destination has been reached, that is, if the distance obtained by the distance calculation unit 154 exceeds the error distance (NO in step SA5), the movement speed calculation unit 156 moves the movement speed of the mobile terminal 10. Is calculated (step SA7). Specifically, the movement speed calculation unit 156 obtains N (for example, three) pieces of position information from the information stored in the movement position storage unit 155 in order from the latest associated date and time information. get. When the moving speed calculation unit 156 acquires the three pieces of position information, the distance between the position represented by the latest position information and the position represented by the latest previous position information and the two pieces of position information are measured. A time difference between day and time is calculated, and a moving speed between the two positions is calculated from the distance and the time difference. Further, the distance between the position represented by the latest previous position information and the position represented by the latest two previous position information, and the time difference between the date and time when the two position information are measured are calculated, and this distance is calculated. And the moving speed between the two positions is calculated from the time difference. The movement speed calculation unit 156 calculates the average speed of the obtained movement speeds and sets the obtained speed as the movement speed of the mobile terminal 10.

  When the movement speed is obtained, the movement time calculation unit 158 calculates the time required for movement from the current position to the destination. Specifically, the movement time calculation unit 158 divides the distance obtained by the distance calculation unit 154 by the speed obtained by the movement speed calculation unit 156, and uses the time obtained by this division as the mobile terminal 10. Is the time required to move to the destination (step SA8).

  The portable terminal 10 does not measure the position of the portable terminal 10 during the time obtained by the travel time calculation unit 158 (NO in step S9). Here, the portable terminal 10 measures the time by the clock unit 161, and when the time obtained by the travel time calculation unit 158 has elapsed (YES in step SA9), returns the processing flow to step SA2.

  In the present embodiment, the process flow may be returned to step SA2 after step SA3 until N or more pieces of date / time information are stored in the movement position storage unit 155 after the destination is set.

  According to the present embodiment, positioning of the position of the mobile terminal 10 is not performed periodically, but the travel time to the destination is calculated, and positioning is performed during the time obtained by this calculation. Absent. That is, since the positioning is stopped until the destination is approached, the power consumption can be suppressed as compared with the configuration in which the positioning is periodically performed at a predetermined interval.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The configuration of the second embodiment of the present invention is different from the first embodiment in the configuration of the mobile terminal, and the other configurations are the same as those in the first embodiment. Hereinafter, for simplification of description, description of the same configuration as that of the first embodiment is omitted, and the configuration of the mobile terminal 10A according to the second embodiment will be described.

  FIG. 9 is a diagram illustrating a hardware configuration of the mobile terminal 10A. The mobile terminal 10 </ b> A has a positioning unit 110. The positioning unit 110 measures the position of the mobile terminal 10 </ b> A using a position measurement system GPS (Global Positioning System) using an artificial satellite. When positioning unit 110 receives position measurement radio waves transmitted from a plurality of artificial satellites, it calculates the latitude and longitude of the position of mobile terminal 10A based on the phase difference of the radio waves transmitted from the respective artificial satellites. .

(Functional configuration of mobile terminal 10A)
FIG. 10 is a block diagram illustrating a configuration of functions realized in the mobile terminal 10A by executing the positioning application.
The second positioning unit 151 controls the positioning unit 110 to measure the position of the mobile terminal 10 </ b> A, and generates position information representing the latitude and longitude obtained by the positioning unit 110. In addition, since the 2nd positioning part 151 will perform a positioning using GPS, an error is smaller than the 1st positioning part 150, and it can perform a positioning accurately. Further, when positioning is performed by the second positioning unit 151, the positioning unit 110 is driven to perform positioning, so that the power consumption is larger than that of the first positioning unit 150.

The distance calculation unit 154 according to the present embodiment calculates a linear distance from the position of the mobile terminal 10A to the destination. The distance calculation unit 154 according to the present embodiment represents the position information stored in the destination storage unit 153 from the position information obtained by the first positioning unit 150 or the position represented by the position information obtained by the second positioning unit 151. Calculate the distance to the position.
The moving speed storage unit 157 according to the present embodiment includes the speed information obtained by the moving speed calculation unit 156, the position information obtained by the first positioning unit 150 or the position information obtained by the second positioning unit 151, and the speed information. The calculated date and time information is stored in the speed table TB2 in association with each other.

The travel time calculation unit 158 according to the present embodiment calculates the time required to move from the position measured by the first positioning unit 150 or the second positioning unit 151 to the destination. The travel time is calculated by dividing the distance obtained by the distance computation unit 154 by the speed obtained by the travel speed computation unit 156.
The comparison unit 159 compares the positioning error at the time of positioning by the first positioning unit 150 with the distance obtained by the distance calculation unit 154.
The determination unit 160 according to the present embodiment determines whether the mobile terminal 10A has reached the destination. The determination unit 160 determines whether or not the destination is within a predetermined range from the position represented by the position information obtained by the second positioning unit 151. In the present embodiment, the predetermined range is within a radius of 15 m from the position represented by the position information, but is not limited to this range.
The control unit 162 selects either the first positioning unit 150 or the second positioning unit 151, and causes the selected positioning unit to perform positioning.

(Operation of Second Embodiment)
Next, the operation of the mobile terminal 10A will be described. First, when the user performs an operation to instruct execution of the positioning application on the operation unit 106, the positioning application is executed, and each function illustrated in FIG. 10 is realized. Further, the realized destination setting unit 152 displays a map screen. When the operation unit 106 is operated by the user and a destination is specified on the displayed map, position information indicating the specified position is stored in the destination storage unit 153 (FIG. 11: Step SB1). ).

  When the location information of the destination is stored in the destination storage unit 153, the control unit 162 selects the first positioning unit 150 as a means used for positioning (step SB2). When the first positioning unit 150 is selected as a means used for positioning, the supply of power to the positioning unit 110 is stopped, and the power consumption is suppressed. Next, in the mobile terminal 10A, the means selected as the means used for positioning is determined. Here, it is determined which of the first positioning unit 150 and the second positioning unit 151 is selected, and if it is determined that the first positioning unit 150 is selected (YES in step SB3), the control unit 162 The first positioning unit 150 performs positioning, and the position of the mobile terminal 10A is measured by the first positioning unit 150 (step SB4).

  Specifically, the base station identifier received by the communication unit 108 is transmitted to the server device 30 via the mobile communication network 20. When the base station identifier is received by the communication unit 308 of the server device 30, the CPU 302 searches the base station table TB3 for a base station identifier that matches the received base station identifier. When a base station identifier that matches the received base station identifier exists in the base station table TB3, the CPU 302 has “latitude” information and “longitude” information stored in the same record as the searched base station identifier. The position information and the “error” information stored in the same record are transmitted to the mobile terminal 10A. When this position information is received by the communication unit 108, the first positioning unit 150 associates the received position information with error information and the date / time information generated by the clock unit 161 in the movement position storage unit 155. Store (step SB5).

  Next, the distance calculation unit 154 determines the distance between the position represented by the position information stored in the movement position storage unit 155 and the position represented by the position information stored in the destination storage unit 153 (distance to the destination). ) Is calculated (step SB6). When the calculation of the distance is completed, the comparison unit 159 compares the distance to the destination obtained by the calculation with the error obtained in step SB4.

  Here, when the distance to the destination is equal to or greater than the error distance (NO in step SB7), the moving speed calculator 156 calculates the moving speed of the mobile terminal 10 (step SB8). Specifically, the movement speed calculation unit 156 obtains N (for example, three) pieces of position information from the information stored in the movement position storage unit 155 in order from the latest associated date and time information. get. When the moving speed calculation unit 156 acquires the three pieces of position information, the distance between the position represented by the latest position information and the position represented by the latest previous position information and the two pieces of position information are measured. A time difference between day and time is calculated, and a moving speed between the two positions is calculated from the distance and the time difference. Further, the distance between the position represented by the latest previous position information and the position represented by the latest two previous position information, and the time difference between the date and time when the two position information are measured are calculated, and this distance is calculated. And the moving speed between the two positions is calculated from the time difference. The movement speed calculation unit 156 calculates an average speed of the obtained movement speeds, and sets the obtained speed as the movement speed of the mobile terminal 10A.

  When the movement speed is obtained, the movement time calculation unit 158 calculates the time required for movement from the position of the mobile terminal 10A to the destination. Specifically, the movement time calculation unit 158 divides the distance obtained by the distance calculation unit 154 by the speed obtained by the movement speed calculation unit 156, and uses the time obtained by this division as the mobile terminal 10A. Is the time required to move to the destination (step SB9).

  The portable terminal 10A does not measure the position of the portable terminal 10A during the time obtained by the travel time calculation unit 158. Here, the portable terminal 10A measures the time by the clock unit 161, and when the time obtained by the travel time calculation unit 158 has elapsed (YES in step SB10), returns the processing flow to step SB3.

  Note that if there is a destination in the cell in which the mobile terminal 10A is located, the distance from the radio base station to the mobile terminal 10A is less than the error distance, so YES is determined in step SB7, and the control unit 162 However, the second positioning unit 151 is selected as a means used for positioning (step SB11). When the second positioning unit 151 is selected, electric power is supplied to the positioning unit 110, and positioning by GPS becomes possible. The control unit 162 causes the second positioning unit 151 to perform positioning, and the position of the mobile terminal 10A is measured by the second positioning unit 151 (step SB12). The second positioning unit 151 associates the position information obtained by positioning with the date / time information generated by the clock unit 161 and causes the movement position storage unit 155 to store the information.

Next, the distance calculation unit 154 calculates the distance between the position represented by the position information obtained in step SB12 and the position represented by the position information stored in the destination storage unit 153 (step SB13). When the calculation of the distance ends, the determination unit 160 determines whether the mobile terminal 10A has reached the destination. Specifically, the determination unit 160 determines whether or not the distance obtained by the distance calculation unit 154 is equal to or less than a predetermined distance (in other words, the destination is determined in advance from the position measured by the second positioning unit 151). It is determined whether or not it is within the specified range. If the distance obtained by distance calculation unit 154 is equal to or less than a predetermined distance (YES in step SB14), it is determined that the destination has been reached. Then, the display unit 107 is controlled by the CPU 102 and a screen for notifying that the destination has been reached is displayed. Further, the call unit 109 is controlled by the CPU 102, and a user is notified that the destination has been reached by emitting sound from the speaker (step SB17).
On the other hand, when the distance obtained by the distance calculation unit 154 exceeds a predetermined distance (NO in step SB14), the comparison unit 159 compares the distance obtained in step SB13 with the error obtained in step SB4. Here, when the distance obtained by the distance calculation unit 154 is equal to or larger than the error distance obtained in step SB4 (NO in step SB15), the control unit 162 selects the first positioning unit 150 as a means used for positioning. (Step SB16). On the other hand, if the distance obtained in step SB13 is less than the error distance obtained in step SB4 (YES in step SB15), the means used for positioning is not changed, and the process flow moves to step SB8.

  In the present embodiment, until N or more pieces of date / time information are stored in the movement position storage unit 155 after the destination is set, the process flow returns to step SB3 after determining NO in step SB7. May be. If it is determined as YES in step SB15, the position may be measured periodically by returning the process flow to step SB11.

  According to the present embodiment, the driving of the positioning unit 110 is controlled according to the distance from the mobile terminal 10A to the destination, and the power consumption is suppressed. In addition, positioning is not performed periodically, but the travel time to the destination is calculated, and positioning is not performed during the time obtained by this calculation. That is, since the positioning is stopped until the destination is approached, the power consumption can be suppressed as compared with the configuration in which the positioning is periodically performed at a predetermined interval. In addition, since the positioning by the first positioning unit 150 is not performed until the mobile terminal 10A approaches the destination, the time required for positioning by the positioning unit having a large error is shortened.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. For example, the above-described embodiment may be modified as follows to implement the present invention, or may be implemented in combination with each modification.

In the above-described embodiment, the destination is represented by the latitude and longitude of the destination. However, the destination may be within a predetermined range from the position specified by the latitude and longitude. In this case, the user may set the value of n with the operation unit 106 with the destination within a radius n [m] from the position specified by the latitude and longitude.
In the embodiment described above, there is one set destination, and the destination table TB1 has one record. However, a plurality of destinations may be set to set a plurality of records. In addition, the user may select any of a plurality of set destinations by operating the operation unit 106.
Further, the configuration for setting the destination is not limited to the configuration described above. A table in which the address is associated with the latitude and longitude of the position specified by the address may be stored as data of the positioning application. Then, the address input when the positioning application is executed may be searched in this table, and the latitude and longitude positions associated with the searched address may be set as the destination.

In the present invention, the positioning unit 110 may measure the altitude of the mobile terminal 10A. Further, when calculating the linear distance from the position of the mobile terminal 10A to the destination, the linear distance including the measured altitude may be calculated.
Further, when calculating the distance from the position of the mobile terminal 10A to the destination, the distance calculation unit 154 calculates the movement route from the position of the mobile terminal 10A to the destination using the technology of the navigation device, and calculates the calculated route. May be calculated.
In addition, when the first positioning unit 150 is selected as the positioning unit, the distance calculation unit 154 according to the second embodiment calculates the destination storage unit from the position represented by the position information obtained by the first positioning unit 150. A distance obtained by adding the distance to the position represented by the position information stored in 153 and the error obtained in step SB4 may be the distance from the mobile terminal 10A to the destination.
In addition, when the second positioning unit 151 is selected as the positioning unit, the distance calculation unit 154 according to the second embodiment calculates the destination storage unit from the position represented by the position information obtained by the second positioning unit 151. The distance obtained by adding the distance to the position represented by the position information stored in 153 and the error of the positioning unit 110 may be the distance from the mobile terminal 10A to the destination. Note that the error of the positioning unit 110 may be stored in advance in the mobile terminal 10A.

In the above-described embodiment, the mobile communication network 20 and the mobile terminals 10 and 10A are compliant with IMT-2000, but are not limited to IMT-2000. The system that the portable terminals 10 and 10A conform to may be other systems.
In the embodiment described above, the mobile terminals 10 and 10A are mobile phones, but may be any computer device that can be connected to the mobile communication network 20, such as a PDA (Personal Digital Assistant) or a personal computer. It may be. The mobile terminals 10 and 10A may be positioning devices that measure the position of a car navigation device or a portable navigation device mounted on a car.
In the above-described embodiment, the wireless base station is a wireless base station of the mobile communication network 20, but may be a public wireless LAN (Local Area Network) base station. May be configured to perform communication complying with the above.

In the embodiment described above, the base station table TB3 is stored in the server device 30, but the base station table TB3 may be included in the positioning application and stored in the mobile terminals 10 and 10A. In the case of this configuration, the mobile terminals 10 and 10A do not transmit the base station identifier to the server device 30, and specify the positions of the mobile terminals 10 and 10A using the base station table TB3 stored in the mobile terminals 10 and 10A. To do.
The base station table TB3 stores the latitude and longitude in the above-described embodiment, but may store the altitude of the position of the base station. In the case of this configuration, the distance calculation unit 154 may perform calculation including the altitude stored in the base station table TB3.

  In the embodiment described above, the first positioning unit 150 measures the position using the identifier of the radio base station, and the second positioning unit 151 measures the position using the GPS. In the section, the method of measuring the position is not limited to these methods. For example, the second positioning unit 151 measures the position using GPS, but is not limited to GPS as long as it is a method (satellite positioning system) that measures the position using a satellite. It may be. In addition, if the accuracy of positioning performed by the second positioning unit 151 is higher than the accuracy of positioning performed by the first positioning unit 150, the positioning method performed by the second positioning unit 151 is not limited to the positioning method of the above-described embodiment. Other positioning methods may be used. In the first embodiment, the positioning unit 110 may be provided, and the first positioning unit 150 may control the positioning unit 110 to measure the position of the mobile terminal 10. In the case of this configuration, when the distance to the destination is greater than or equal to the predetermined distance in step SA5, the process proceeds to step SA7, and the distance to the destination is less than the predetermined distance. In this case, it may be determined whether or not the destination has been reached. If the destination has not been reached, the processing flow may be returned to step SA2 to periodically measure the position.

  In the embodiment described above, the speed table TB2 stores position information. However, the base station identifier received when the position information is obtained may be stored. Further, in the speed table TB2, when a certain number of records are stored and information is newly stored, the record in which the oldest date / time information is stored may be deleted. Further, in the speed table TB2, a record having date / time information within the range of a certain time in the past from the date / time measured by the clock unit 161 may be left, and the record having date / time information outside this range may be deleted. In the speed table TB2, altitude information may be stored in addition to the latitude and longitude.

In the present invention, the moving speed calculation unit 156 determines the position information position when the position information position stored in the speed table TB2 is close to the position information position obtained in step SB4 or step SB12. The moving speed associated with the position information of a close position (for example, within a predetermined range from the measured position) may be read, and the read moving speed may be used as the moving speed of the mobile terminal 10.
In addition, one or a plurality of movement speeds associated with position information of a position close to the measured position (for example, a position within a range determined from the measured position) are read, and an arithmetic average value of the read movement speeds May be the moving speed.
Also, there is one moving speed that is associated with position information of a position close to the positioned position, and is associated with a time close to the positioning time (a time within a range determined from the positioning time). Alternatively, a plurality of readings and an arithmetic average value of the read moving speeds may be used as the moving speed.
When reading a plurality of movement speeds, the movement speed is weighted according to the distance between the position of the position information obtained by positioning and the position of the position information associated with the read movement speed. The average of the moving speed may be obtained.
For example, the speed table TB2 shows a movement speed associated with a position away from the measured position by a distance a and a movement speed associated with a position away from the measured position by a distance b (b> a). In the case of reading from the above, the weighted average may be calculated by increasing the weight of the moving speed associated with the position closer to the measured position.
The moving speed obtained by the arithmetic average or the weighted average is stored in the moving speed storage unit 157 in association with the position of the position information obtained in step SA2, step SB4, or step SB12 and the date and time measured by the clock unit 161. You may make it make it.

  In the above-described embodiment, when the first positioning unit 150 is selected as the means used for positioning, the power supply to the positioning unit 110 is stopped, but the power supply may not be stopped. When the first positioning unit 150 is selected as the means used for positioning and the power supply to the positioning unit 110 is not stopped, the positioning unit 110 may stop positioning of the position. If the positioning in the positioning unit 110 is stopped, the power consumption can be suppressed even if power is supplied to the positioning unit 110.

DESCRIPTION OF SYMBOLS 10,10A ... Portable terminal, 20 ... Mobile communication network, 30 ... Server apparatus, 101 ... Bus, 102 ... CPU, 103 ... ROM, 104 ... RAM, 105・ ・ ・ Storage unit 106 ... Operation unit 107 ... Display unit 108 ... Communication unit 109 ... Call unit 110 ... Positioning unit 150 ... First positioning unit 151: Second positioning unit, 152 ... Destination setting unit, 153 ... Destination storage unit, 154 ... Distance calculation unit, 155 ... Movement position storage unit, 156 ... Movement speed Calculation unit, 157... Movement speed storage unit, 158... Travel time calculation unit, 159... Comparison unit, 160... Determination unit, 161. ˜210C: wireless base station, 301: bus, 302: CPU, 3 3 ... ROM, 304 ... RAM, 305 ... storage unit, 306 ... operating unit, 307 ... display unit, 308 ... communication unit

Claims (8)

Destination storage means for storing location information representing the location of the destination;
Positioning means for positioning the position of the aircraft,
Distance calculating means for calculating the distance from the position measured by the positioning means to the position of the position information stored in the destination storage means;
Moving position storage means for storing the position information representing the position measured by the positioning means and the time information representing the time when the position is measured;
When the distance calculated by the distance calculation means exceeds a predetermined distance, the movement of the own device at the position measured by the positioning means based on the position information and time information stored in the movement position storage means A moving speed calculating means for calculating the speed;
When the distance calculated by the distance calculation means exceeds a predetermined distance, the travel time of the own device from the position measured by the positioning means to the position of the position information stored in the destination storage means, A movement time calculation means for calculating from the calculation result of the distance calculation means and the calculation result of the movement speed calculation means;
Until the movement time calculated by the movement time calculation means elapses, positioning by the positioning means is stopped, and when the movement time elapses, the positioning means performs positioning, and the distance calculation means calculates And a control unit that causes the positioning unit to periodically perform positioning when the determined distance is equal to or less than a predetermined distance.   2. The distance calculating means performs an operation of adding a positioning error of the positioning means to a distance from a measured position to a position of position information stored in the destination storage means. The positioning device described in 1. A movement speed storage means for storing the position measured by the positioning means and the movement speed at the position in association with each other;
The moving speed calculating means calculates an arithmetic average or a weighted average of moving speeds associated with a position within a range determined from the position measured by the positioning means in the moving speed storage means. As moving speed,
The moving speed storage means stores the moving speed obtained from the arithmetic average or the weighted average and the position measured by the positioning means in the moving speed storage means in association with each other. The positioning device according to claim 2. A movement speed storage means for storing the position measured by the positioning means, the movement speed at the position, and the time at which the movement speed is calculated;
The moving speed calculation means is associated with a position within a range determined from the position where positioning is performed in the moving speed storage means, and is associated with a time within a range determined from the positioning time. The arithmetic average or weighted average of the moving speeds that are
The moving speed storage means associates the moving speed obtained from the arithmetic average or the weighted average, the position measured by the positioning means, and the time when the moving speed is obtained from the arithmetic average or the weighted average. The positioning device according to claim 1, wherein the positioning device is stored in the moving speed storage unit.   5. The travel time calculating means according to claim 1, wherein when the travel time obtained by the calculation falls outside a predetermined time range, the travel time is set to a time within the time range. A positioning device according to the above. Destination storage means for storing location information representing the location of the destination;
A first positioning means for positioning the position of the aircraft;
A second positioning means for measuring the position of the own device, wherein power consumption during positioning is greater than that of the first positioning means, and positioning error is smaller than that of the first positioning means;
Control means for selecting either the first positioning means or the second positioning means and causing the selected positioning means to perform positioning;
Distance calculating means for calculating the distance from the position measured by the positioning means selected by the control means to the position of the position information stored in the destination storage means;
Moving position storage means for storing the position information indicating the position measured by the positioning means selected by the control means and the time information indicating the time when the position is measured;
When the distance calculated by the distance calculating means is equal to or greater than the positioning error of the first positioning means, the distance is selected by the control means based on the position information and time information stored in the moving position storage means. A moving speed calculating means for calculating the moving speed of the own machine at the position measured by the positioning means,
When the distance calculated by the distance calculating means is equal to or larger than the positioning error of the first positioning means, the distance is stored in the destination storage means from the position determined by the positioning means selected by the control means. A movement time calculation means for calculating the movement time of the own machine to the position of the position information from the calculation result of the distance calculation means and the calculation result of the movement speed calculation means;
The control means selects the second positioning means when the calculation result of the distance calculation means is less than the positioning error of the first positioning means, and the travel time calculated by the travel time calculation means. Until the time elapses, positioning by the selected positioning means is stopped, and when the moving time elapses, the selected positioning means performs positioning, and the distance calculated by the distance calculation means is less than the error. In the case of, a positioning device characterized by causing the selected positioning means to periodically perform positioning. A destination storage step for storing location information representing the location of the destination;
A distance calculation step for calculating a distance from a position measured by a positioning means for positioning the position of the own machine to a position of position information stored in the destination storage means;
A moving position storage step for storing the position information indicating the position measured by the positioning means and the time information indicating the time when the position is measured;
When the distance calculated by the distance calculating step exceeds a predetermined distance, the own device moves at the position measured by the positioning means based on the position information and time information stored in the moving position storing step. A moving speed calculation step for calculating the speed;
When the distance calculated by the distance calculation step exceeds a predetermined distance, the travel time of the own device from the position measured by the positioning means to the position of the position information stored in the destination storage step, A movement time calculation step for calculating from the calculation result of the distance calculation step and the calculation result of the movement speed calculation step;
Until the travel time calculated in the travel time calculation step elapses, positioning by the positioning unit is stopped, and when the travel time elapses, the positioning unit performs positioning, and the distance calculation step calculates And a control step for causing the positioning means to periodically perform positioning when the determined distance is equal to or less than a predetermined distance. A destination storage step for storing location information representing the location of the destination;
First positioning means for positioning the position of the own apparatus, and second positioning for measuring the position of the own apparatus, wherein power consumption during positioning is larger than that of the first positioning means, and positioning error is smaller than that of the first positioning means. A control step of selecting any of the means and causing the selected positioning means to perform positioning;
A distance calculation step of calculating a distance from the position measured by the positioning means selected in the control step to the position of the position information stored in the destination storage step;
A moving position storing step for storing the position information representing the position measured by the positioning means selected by the control means and the time information representing the time when the position is measured;
When the distance calculated in the distance calculating step is equal to or larger than the positioning error of the first positioning means, the distance is selected in the control step based on the position information and time information stored in the moving position storing step. A moving speed calculation step for calculating the moving speed of the own device at a position measured by a positioning means;
If the distance calculated in the distance calculating step is greater than or equal to the positioning error of the first positioning means, the position stored in the destination storage step from the position determined by the positioning means selected in the control step A movement time calculation step for calculating the movement time of the own machine to the position of information from the calculation result of the distance calculation step and the calculation result of the movement speed calculation step;
The control step selects the second positioning means when the calculation result of the distance calculating step is less than the positioning error of the first positioning means, and the moving time calculated by the moving time calculating step is selected. Until the time elapses, positioning by the selected positioning means is stopped, and when the moving time elapses, the selected positioning means performs positioning, and the distance calculated by the distance calculating step is less than the error. In the case of, a positioning method characterized by causing the selected positioning means to perform positioning periodically.

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