JP2013072779A - Location information acquisition device, location information acquisition method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a location information acquisition device and the like for acquiring accurate location information while maintaining an operation duration.SOLUTION: A location information acquisition device 100 comprises: a travel history acquisition unit 181 for acquiring a current time and current location information at the current time at specific time intervals; a processing execution time acquisition unit 182 for acquiring a processing execution time when specific processing is being executed; a processing execution location calculation unit 185 for calculating a processing execution location at the processing execution time on the basis of first current location information acquired at a time before the processing execution time, second current location information acquired at a time after the processing execution time, a first current time corresponding to the first current location information, a second current time corresponding to the second current location information, and the processing execution time; and an operation history acquisition unit 184 for storing the processing execution location and the processing execution time in association with each other.

Description

  The present invention relates to a position information acquisition device, a position information acquisition method, and a program.

  An increasing number of mobile terminals have a GPS (Global Positioning System) function. In order to acquire highly accurate position information using the GPS function, it is necessary to reduce the GPS measurement interval. However, since the portable terminal operates in a battery environment, there is a problem that if the GPS measurement interval is reduced, power consumption increases and the operation duration of the portable terminal is shortened. In order to solve this problem, Patent Document 1 discloses a technique for increasing the GPS measurement interval in a scene where position information accuracy is not required and reducing the GPS measurement interval in a scene where position information accuracy is required. It is disclosed.

JP 2000-249565 A

  In the case of the technique disclosed in Patent Document 1, when position information is suddenly needed under a situation where the GPS measurement interval is large (for example, “time” and “position” when the camera function is operated). When it becomes necessary to save the operation history), there is a problem that highly accurate position information cannot be acquired. In addition, there is a problem that the operation duration time of the mobile terminal is still short in a usage environment where there are many scenes where highly accurate position information is required.

  The present invention has been made in view of such problems, and provides a position information acquisition device, a position information acquisition method, and a program for acquiring position information with high accuracy while maintaining an operation duration. Objective.

The position information acquisition apparatus according to the first aspect of the present invention is:
A movement history acquisition unit that acquires current time and current position information at the current time at predetermined time intervals;
A process execution time acquisition unit that acquires a process execution time when executing a predetermined process;
First current position information acquired at a time before the process execution time, a first current time corresponding to the first current position information, and a first current position acquired at a time after the process execution time The process execution for calculating the current position at the process execution time as the process execution position based on the second current position information, the second current time corresponding to the second current position information, and the process execution time. A position calculation unit;
An operation history acquisition unit that stores the process execution position and the process execution time corresponding to the process execution position in association with each other.
It is characterized by that.

The processing execution position calculation unit
A time from the first current time to the second current time and a time from the first current time to the process execution time or a time from the process execution time to the second current time. Calculate the ratio,
Based on the calculated ratio, the processing execution position may be calculated by internally dividing a straight line connecting the position indicated by the first current position information and the position indicated by the second current position information.

A road information storage unit for storing road information;
The processing execution position calculation unit
Based on the road information stored in the road information storage unit, determine a route connecting the position indicated by the first current position information and the position indicated by the second current position information;
A ratio of the time from the first current time to the second current time and the time from the first current time to the process execution time or the time from the process execution time to the second current time To calculate
Based on the calculated ratio, the processing execution position may be calculated by dividing a route connecting the position indicated by the first current position information and the position indicated by the second current position information.

The operation history acquisition unit
It is determined whether or not the processing execution time is within a predetermined time from the first acquisition time, and when it is determined that the processing execution time is within the predetermined time, the first current position information is acquired as the processing execution position If the process execution time is within a predetermined time from the second acquisition time, and if it is determined that the process execution time is within the predetermined time, the second current position information is determined as the process execution position. If it is neither of them, the position calculated by the process execution position calculation unit is acquired as the process execution position,
The acquired process execution position and the process execution time corresponding to the process execution position may be stored in association with each other.

The predetermined process is a process that requires a predetermined time width from the start of the process to the end of the process,
The process execution time acquisition unit acquires a plurality of different process execution times from the process start to the process end,
The operation history acquisition unit may acquire the process execution position for each of the process execution times acquired by the process execution time acquisition unit.

The position information acquisition method according to the second aspect of the present invention includes:
A movement history acquisition step of acquiring the current time and the current position information at the current time at a predetermined time interval;
A process execution time acquisition step for acquiring a process execution time when executing a predetermined process;
First current position information acquired at a time before the process execution time, a first current time corresponding to the first current position information, and a first current position acquired at a time after the process execution time The process execution for calculating the current position at the process execution time as the process execution position based on the second current position information, the second current time corresponding to the second current position information, and the process execution time. A position calculating step;
An operation history acquisition step of storing the process execution position and the process execution time corresponding to the process execution position in association with each other.
It is characterized by that.

The position information acquisition program according to the third aspect of the present invention is:
On the computer,
A movement history acquisition function for acquiring current time and current position information at the current time at predetermined time intervals;
A process execution time acquisition function for acquiring a process execution time when executing a predetermined process;
First current position information acquired at a time before the process execution time, a first current time corresponding to the first current position information, and a first current position acquired at a time after the process execution time The process execution for calculating the current position at the process execution time as the process execution position based on the second current position information, the second current time corresponding to the second current position information, and the process execution time. Position calculation function,
An operation history acquisition function for storing the processing execution position in association with the processing execution time corresponding to the processing execution position;
Is executed.

  It is possible to provide a position information acquisition device, a position information acquisition method, and a program that acquire position information with high accuracy while maintaining the operation duration.

It is a general-view figure of the positional information acquisition apparatus which concerns on embodiment of this invention. It is a block diagram of the positional information acquisition apparatus which concerns on embodiment of this invention. It is a figure for demonstrating the present position information output from the receiving part of a position information acquisition apparatus. It is a figure for demonstrating the data stored in the memory | storage part of a positional information acquisition apparatus. It is a functional block diagram for demonstrating the function of the control part of a positional information acquisition apparatus. It is a flowchart for demonstrating the movement history acquisition process which concerns on embodiment of this invention. It is a figure which shows a mode that a movement history is memorize | stored in a memory | storage part. It is a flowchart for demonstrating the image imaging process which concerns on embodiment of this invention. It is a figure which shows a mode that process execution time is memorize | stored in a memory | storage part. It is a flowchart for demonstrating the operation | movement log acquisition process which concerns on embodiment of this invention. It is a figure for demonstrating operation | movement log acquisition processing, (A) is a figure for demonstrating the present position information acquired immediately before process execution time is acquired, (B) is process execution time acquisition. It is a figure for demonstrating the present position information acquired immediately after being performed. It is a figure for demonstrating a mode that a process execution position is calculated. It is a figure which shows a mode that operation | movement history is memorize | stored in a memory | storage part. It is a figure for demonstrating an example of the calculation method of a process execution position.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  The position information acquisition apparatus 100 according to the embodiment of the present invention is, for example, a mobile terminal such as a mobile phone or a PDA (Personal Digital Assistant) (for example, a touch panel type mobile terminal as shown in FIG. 1). The position information acquisition apparatus 100 has various functions such as an imaging function and a recording function, and stores “time” and “position” when these functions are executed as an operation history. In the following description, in order to facilitate understanding, a process that is an operation history storage target is described as “image capturing”.

Hereinafter, the configuration of the position information acquisition apparatus 100 will be described.
As illustrated in FIG. 2, the position information acquisition apparatus 100 includes a reception unit 110, a storage unit 120, a display unit 130, an operation unit 140, an imaging unit 150, a timer 160, a battery 170, and a control unit 180. It consists of.

  The receiving unit 110 includes a receiver that receives radio waves from a navigation satellite of a satellite positioning system (for example, GPS (Global Positioning System), Galileo Positioning System (Galileo Positioning System), etc.). When receiving the radio wave from the navigation satellite, the receiving unit 110 receives the current position (for example, information of 139 degrees 44 minutes and 28 seconds east longitude and 35 degrees 39 minutes and 29 seconds north latitude based on information included in the received radio waves. Is calculated and transmitted to the control unit 180. In the following description, for easy understanding, the current position information is described as coordinate information (x, y) with a certain position on the map as the origin O as shown in FIG.

  The receiving unit 110 has two operation modes (“power saving mode” and “normal mode”). The “power saving mode” is a mode that operates with minimum power consumption by stopping reception of radio waves from the navigation satellite. The “normal mode” is a mode that operates with normal power consumption, and is a mode that performs operations such as receiving radio waves from a navigation satellite and calculating a current position, for example. Receiving unit 110 shifts to the power saving mode upon receiving information for instructing operation stop (hereinafter referred to as “operation stop command”) from control unit 180. In addition, when receiving information (hereinafter referred to as “operation start command”) for instructing operation start from the control unit 180, the mode is changed to the normal mode.

  Returning to FIG. 2, the storage unit 120 includes a readable and writable nonvolatile storage device such as a hard disk or a flash memory. The storage unit 120 records various data such as “movement history”, “processing execution time”, and “operation history”.

  “Movement history” is information in which the current time is associated with the current position information at that time. The movement history is acquired by the control unit 180 every predetermined time (for example, every 5 minutes), and is sequentially accumulated in the storage unit 120, for example, as shown in FIG.

  The “process execution time” is a time when a predetermined process (for example, image capturing) is executed. The process execution time is acquired by the control unit 180 and temporarily stored in the storage unit 120 when a predetermined process is executed, for example, as shown in FIG.

  “Operation history” is information that associates a process execution time with position information at that time (hereinafter referred to as “process execution position”). The operation history is acquired by the control unit 180 and accumulated in the storage unit 120 as needed, for example, as shown in FIG.

  Returning to FIG. 2, the display unit 130 includes a display device such as an LCD (Liquid Crystal Display) or an OELD (Organic EctroLuminescence Display). The display unit 130 displays an image or video according to the control of the control unit 180.

  The operation unit 140 includes various user interfaces such as a position input sensor 141, a menu button 142, and a power button 143.

  The position input sensor 141 includes a position input device such as a touch panel. The position input sensor 141 has a transparent sheet shape or a transparent plate shape, and is installed so as to cover the entire image display portion of the display unit 130. A conductive film is formed on the surface of the position input sensor 141. When the user presses the display unit 130 from above the position input sensor 141, the position input sensor 141 detects the change of the capacitance of the conductive film to detect the position of the user's finger, and the detected finger position is coordinate information. To the control unit 180.

  The menu button 142 is a button for displaying a menu screen or the like on the display unit 130. Buttons for starting various functions (for example, an image capturing function, a video capturing function, a mail transmission function, etc.) are arranged on the menu screen, and the user touches these buttons to activate the position input sensor 141. Various functions are activated via

  The power button 143 is a button for turning on the position information acquisition apparatus 100. The user presses the power button 143 to turn on the position information acquisition apparatus 100.

  The imaging unit 150 includes an imaging device such as a charge coupled device image sensor (CCD) camera or a complementary metal oxide semiconductor (CMOS) camera. The imaging unit 150 executes imaging in accordance with the control of the control unit 180 and transmits the captured image to the control unit 180.

  The timer 160 is composed of a timing device such as a clock circuit. The timer 160 measures the current time (for example, the current date (year / month / day), time (hour / minute / second), etc.) and transmits the current time to the control unit 180.

  The timer 160 also has a timer function. When time is set from the control unit 180, the timer 160 starts counting down the set time. When the countdown is completed, the timer 160 transmits information indicating the passage of time (hereinafter referred to as “time passage notification”) to the control unit 180.

  The battery 170 is composed of a secondary battery such as a lithium ion battery, for example. The battery 170 supplies power to each unit of the position information acquisition apparatus 100.

  The control unit 180 includes a processing device such as a processor. The control unit 180 operates in accordance with a program stored in a ROM (Read Only Memory) (not shown), and executes various operations including “movement history acquisition processing”, “image capturing processing”, and “operation history acquisition processing” described later. .

  The control unit 180 operates according to the “movement history acquisition process”, “image imaging process”, and “operation history acquisition process”, so that the movement history acquisition unit 181, the process execution time acquisition unit 182, and the image imaging as illustrated in FIG. 5. Functions as a processing unit 183, an operation history acquisition unit 184, and a processing execution position calculation unit 185 (the operation of these functions will be described in the description of “movement history acquisition processing”, “image capturing processing”, and “operation history acquisition processing”. ).

  The control unit 180 operates according to a multi-process (multi-task) type operating system. Therefore, the control unit 180 can execute various processes such as “movement history acquisition process”, “image capturing process”, and “operation history acquisition process” in parallel. In the following description, in order to facilitate understanding, processes for executing “movement history acquisition processing”, “image imaging processing”, and “operation history acquisition processing” are referred to as “movement history acquisition process”, “image imaging process”, “ This is called an “operation history acquisition process”.

Next, the operation of the position information acquisition apparatus 100 having such a configuration will be described.
The operation of the position information acquisition apparatus 100 is divided into “movement history acquisition processing”, “image capturing processing”, and “operation history acquisition processing”.
The movement history acquisition process acquires “current time” and “current position information” at the current time every predetermined time (for example, every 5 minutes), and sets the information associated with the information as “movement history”. This is a process for obtaining.
The “image capturing process” is a process for controlling the image capturing unit 150 to perform image capturing and acquiring the time when the image capturing is performed as the “process execution time”.
“Operation history acquisition processing” acquires the “processing execution time” acquired in the image capturing processing and the current position at the processing execution time as “processing execution position”, and acquires the information associated with them as “operation history”. It is a process to do.

  First, the “movement history acquisition process” will be described.

  When the position information acquisition apparatus 100 is turned on, the control unit 180 instructs the operating system to generate a “movement history acquisition process”. When the movement history acquisition process is generated, the control unit 180 starts “movement history acquisition processing” within the process. The “movement history acquisition process” will be described below with reference to the flowchart of FIG.

  The movement history acquisition unit 181 transmits an operation start command to the reception unit 110. When an operation start command is transmitted from the movement history acquisition unit 181, the reception unit 110 shifts to the normal mode and starts receiving radio waves from the navigation satellite. When receiving the radio wave from the navigation satellite, the receiving unit 110 calculates current position information (x, y) based on information included in the received radio wave. Then, the reception unit 110 transmits the calculated current position information to the movement history acquisition unit 181. When the movement history acquisition unit 181 receives the current position information from the reception unit 110, the movement history acquisition unit 181 stores the received information in a RAM (Random Access Memory) (not shown). When the saving is completed, the movement history acquisition unit 181 transmits an operation stop command to the reception unit 110 in order to save the battery. Upon receiving the operation stop command from the movement history acquisition unit 181, the reception unit 110 shifts to the power saving mode and suppresses power consumption, and waits for the operation start command to be transmitted from the movement history acquisition unit 181 (step S <b> 1). S101).

  Next, the movement history acquisition unit 181 requests the timer 160 to transmit the current time. When the timer 160 receives the current time transmission request from the movement history acquisition unit 181, the timer 160 transmits the current time t to the movement history acquisition unit 181. When the movement history acquisition unit 181 receives the current time t from the timer 160, the movement history acquisition unit 181 stores the received current time t in a RAM (not illustrated) (step S102).

  The movement history acquisition unit 181 associates the current position information (x, y) acquired in step S101 with the current time t acquired in step S102. For example, as illustrated in FIG. Accumulate (step S103).

  Returning to FIG. 6, when the accumulation of the movement history is completed, the movement history acquisition unit 181 waits for a time until the next movement history is acquired. Specifically, the next steps (step S104 and step S105) are executed, and a predetermined time (for example, 5 minutes) is waited. The “predetermined time” is not limited to every 5 minutes. The “predetermined time” may be an interval at which the power consumption by acquiring the movement history while the position information acquisition device 100 is operating becomes a power consumption with less trouble for the user to use the device. preferable. It should be noted that the “predetermined time” is a longer interval when the remaining power amount of the battery 170 is less than or equal to a predetermined amount (for example, when the remaining power amount is 10% or less) than when the remaining power amount is greater than or equal to a predetermined amount. It may be changed to.

  First, the movement history acquisition unit 181 sets a predetermined time for the timer 160 (step S104). When a predetermined time is set, the timer 160 starts counting down the set time. When a predetermined time elapses, the timer 160 transmits a time elapse notification to the movement history acquisition unit 181.

  The movement history acquisition unit 181 determines whether or not a time elapse notification has been received from the timer 160 (step S105). When the time passage notification has not been received (step S105: No), step S105 is repeated until the notification is received. When the time elapse notification is received (step S105: Yes), the process returns to step S101, and acquisition of the movement history is started again.

  Next, the “image capturing process” will be described.

  When the image capturing function is selected by a user's menu screen operation or the like, the control unit 180 instructs the operating system to generate an “image capturing process”. When the image capturing process is generated by the operating system, the control unit 180 starts “image capturing process” in the process. The “image capturing process” will be described below with reference to the flowchart of FIG.

  The image imaging processing unit 183 displays the imaging execution screen on which the shutter button is displayed on the display unit 130 (step S201).

  Based on the coordinate information transmitted from the position input sensor 141, the image capturing processing unit 183 determines whether the user has touched the shutter button on the screen (step S202). If the shutter button is not touched (step S202: No), step S202 is repeated until the shutter button is touched. When the shutter button is touched (step S202: Yes), the process proceeds to step S203.

  When the shutter button is touched, the process execution time acquisition unit 182 requests the timer 160 to transmit the current time. When receiving a request from the process execution time acquisition unit 182, the timer 160 transmits the current time to the process execution time acquisition unit 182. When receiving the current time from the timer 160, the process execution time acquisition unit 182 stores the received current time in the storage unit 120 as the process execution time T as shown in FIG. 9 (step S203).

  Returning to FIG. 8, when the storage of the processing execution time T is completed, the image imaging processing unit 183 controls the imaging unit 150 to execute imaging. When the imaging is completed, the image imaging processing unit 183 stores the image data generated by the imaging unit 150 in the storage unit 120 (Step S204).

  When the image data storage is completed, the image capturing processing unit 183 instructs the operating system to generate an operation history acquisition process in order to execute an “operation history acquisition process” described later (step S205).

  When the operation history acquisition process is generated, the image capturing processing unit 183 ends the image capturing process.

  Next, the “operation history acquisition process” will be described.

  When the operation history acquisition process is generated by the image capturing process, the control unit 180 starts the “operation history acquisition process” in the process. The “operation history acquisition process” will be described below with reference to the flowchart of FIG.

  The operation history acquisition unit 184 acquires from the storage unit 120 the process execution time T and the current position information acquired immediately before the process execution time T (hereinafter referred to as “current position information t1”). For example, the processing execution time T (= 12: 45: 8) is stored in the storage unit 120 as shown in (a) of FIG. 11 (A), and (b) shown in FIG. 11 (A). If the movement history (movement history 25, 24,...) Is accumulated as shown in FIG. 11, the current position information t1 is 12:45:00 in (c) of FIG. . The operation history acquisition unit 184 calculates a difference (T−t1) between the process execution time T and the current position information t1, and stores it in a RAM (not shown) (step S301).

  Returning to FIG. 10, the operation history acquisition unit 184 determines whether the difference (T−t1) between the process execution time T and the current position information t1 is within a predetermined time c1 (for example, whether it is within 10 seconds) ( Step S302).

  When the difference (T−t1) is within the predetermined time c1 (step S302: Yes), the operation history acquisition unit 184 indicates the current position information associated with the current position information t1 (for example, (d) shown in FIG. 11A). (13589, 24680), hereinafter referred to as “current position information (x1, y1)”) is stored as a process execution position (hereinafter referred to as process execution position (X, Y)) in a RAM (not shown) (step S303).

  Returning to step S302 in FIG. 10, when the difference (T−t1) is larger than the predetermined time c1 (step S302: No), the operation history acquisition unit 184 adds a new position to the storage unit 120 by the “movement history acquisition process” described above. Wait until the information is stored (step S304: No).

  When new position information is stored in the storage unit 120 (step S304: Yes), the operation history acquisition unit 184 acquires the current position information (immediately after the process execution time T and the process execution time T from the storage unit 120 ( Hereinafter, “current position information t2”) is acquired. For example, the processing execution time T (= 12: 49: 53) is stored in the storage unit 120 as shown in (a) of FIG. 11B, and (b) shown in FIG. 11B. If the movement history (movement history 26, 25, 24,...) Is accumulated as shown in FIG. 11, the current position information t2 is 12:50:00 in FIG. is there. The operation history acquisition unit 184 calculates a difference (t2−T) between the current position information t2 and the process execution time T and stores it in a RAM (not shown) (step S305).

  Returning to FIG. 10, the operation history acquisition unit 184 determines whether or not the difference (t2−T) between the process execution time T and the current position information t1 is within a predetermined time c2 (for example, whether it is within 10 seconds). Step S306).

  When the difference (t2−T) is within the predetermined time c2 (step S306: Yes), the operation history acquisition unit 184 indicates the current position information associated with the current position information t2 (for example, (d) shown in FIG. 11B). (13945, 24920), hereinafter referred to as “current position information (x2, y2)”) is stored in a RAM (not shown) as a process execution position (X, Y) (step S307).

  Returning to step S306 in FIG. 10, when the difference (t2-T) is larger than the predetermined time c2 (step S306: No), the process execution position calculation unit 185 determines that the user is at positions (x1, y1) and (x2, y2). The processing execution position (X, Y) is calculated on the assumption that it has moved linearly at a constant speed as shown in FIG. 12A (step S308).

  For example, as shown in FIG. 12B, the process execution position calculation unit 185 determines the current position based on the ratio between the time from the current time t1 to t2 and the time from the current time t1 to the process execution time T. A position obtained by internally dividing a straight line connecting information (x1, y1) and (x2, y2) is calculated as a processing execution position (X, Y). Specifically, the process execution position calculation unit 185 calculates the process execution position (X, Y) by the following (Expression 1) to (Expression 3).

α = (T−t1) / (t2−t1) (Equation 1)
X = x1 + α × (x2−x1) (Equation 2)
Y = y1 + α × (y2-y1) (Equation 3)

  Here, α is the ratio of the time from the current time t1 to t2 and the time from the current time t1 to the processing execution time T, and X and Y are the X and Y of the processing execution position (X, Y), respectively. Value.

  Note that the process execution position calculation unit 185 may calculate the process execution position (X, Y) based on the ratio of the time from the current time t1 to t2 and the time from the process execution time T to t2. Is possible. Specifically, the process execution position calculation unit 185 calculates the process execution position (X, Y) by the following (Expression 4) to (Expression 6).

α = (t2-T) / (t2-t1) (Equation 4)
X = x2−α × (x2−x1) (Equation 5)
Y = y2−α × (y2−y1) (Equation 6)

  Here, α is the ratio of the time from the current time t1 to t2 and the time from the process execution time T to t2, and X and Y are the X and Y values of the process execution position (X, Y), respectively. is there.

  The process execution position calculation unit 185 stores the calculated process execution position (X, Y) in a RAM (not shown) (step S308).

  The operation history acquisition unit 184 associates the process execution position (X, Y) stored in the RAM with the process execution time T, and stores it in the storage unit 120 as an operation history, for example, as shown in FIG. 13 (step S309). ).

  When the storage is completed, the operation history acquisition unit 184 ends the operation history acquisition process.

  According to the present embodiment, the position information acquisition apparatus 100 does not change the measurement interval of the reception unit 110 and operates at a constant interval with a long measurement interval. Can operate with consumption. As a result, a long operation duration can be maintained.

  Further, since the position information acquisition apparatus 100 linearly interpolates the position information based on the movement history, it is possible to acquire a highly accurate processing execution position even if the operation interval of the receiving unit 110 is long.

  In addition, when the processing execution time and the current time when the receiving unit 110 acquires the current position information are within a predetermined interval, the current position information acquired by the receiving unit 110 is set as the processing execution position. As in the case where a large number of movement speed changes occur, the error in the case where linear interpolation does not work effectively can be mitigated, and the accuracy of the processing execution position can be further increased.

  Further, the functions of the position information acquisition apparatus 100 are not limited to the image capturing function and the recording function. The position information acquisition apparatus 100 can have various functions such as an image capturing function, an e-mail function, a browser function, a word processing function, a spreadsheet function, a telephone function, and an application software execution function. At this time, the position information acquisition apparatus 100 may acquire a process execution position (or operation history) for each of these functions.

  Note that the position information acquisition apparatus 100 may acquire a plurality of process execution positions (or operation histories) in one process. For example, a process for which an operation history or a process execution position is acquired requires a process that requires a predetermined time width (for example, a time width of 1 second or more) from the start of the process to the end of the process (for example, an image capturing function, a recording function) In the case of a telephone function or the like, a plurality of process execution positions may be acquired at predetermined time intervals from the process start to the process end. For example, the position information acquisition apparatus 100 may acquire a plurality of processing execution positions (or operation histories) by the following operation.

  First, the process execution time acquisition unit 182 acquires the process start time from the timer 160 when the process is started. Also, the process execution time acquisition unit 182 acquires the process end time from the timer 160 when the process is completed. Then, the process execution time acquisition unit 182 acquires a plurality of process execution times at a predetermined time interval (for example, every 10 seconds) based on the process start time and the process end time (for example, the process start time is 12:51). If the processing end time is 12:51:30 when the time is 12:51:30, “12:51:00”, “12:51:10”, “12:51:20”, “12” Four times “hour 51 minute 30 seconds” are acquired as process execution times). Then, the process execution position calculation unit 185 calculates a process execution position for each of the acquired plurality of process execution times using, for example, the method described in step S308. The operation history acquisition unit 184 acquires a plurality of process execution positions calculated by the process execution position calculation unit 185 and a plurality of process execution times acquired by the process execution time acquisition unit 182. Then, the operation history acquisition unit 184 associates the acquired process execution position with the process execution time, and acquires a plurality of operation histories.

  In step S308, the processing execution position (X, Y) is calculated on the assumption that the position information acquisition apparatus 100 has moved linearly at a constant speed between the positions (x1, y1) and (x2, y2). However, the processing execution position (X, Y) may be calculated on the assumption that the position information acquisition apparatus 100 has moved at a constant speed on the road indicated by the map.

  For example, the position information acquisition apparatus 100 stores map information used for car navigation or the like in the storage unit 120 in advance. The map information stores road information (for example, information in which road position information is recorded at predetermined intervals (for example, every 10 m)). The process execution position calculation unit 185 determines a route connecting the positions (x1, y1) and (x2, y2) based on the road information. Although the determination method is not limited to a specific method, for example, a known method such as Dijkstra method (shortest path problem) can be used.

  Then, the process execution position calculation unit 185 connects the positions (x1, y1) and (x2, y2) as shown in (a) of FIG. 14 based on the road information stored in the storage unit 120. The distance D is calculated. Thereafter, as shown in FIG. 14B, the process execution position calculation unit 185 determines the position (based on the ratio between the time from the current time t1 to t2 and the time from the current time t1 to the process execution time T. A position obtained by internally dividing the path connecting (x1, y1) and (x2, y2) is calculated as the processing execution position (X, Y). Specifically, the process execution position calculation unit 185 calculates the process execution position (X, Y) as follows.

  First, the process execution position calculation unit 185 calculates the distance d from the position (x1, y1) to the process execution position (X, Y) by the following (Expression 7) to (Expression 8). Then, the process execution position calculation unit 185 calculates a position advanced by a distance d along the route from the position (x1, y1) to the position (x2, y2) as the process execution position (X, Y).

α = (T−t1) / (t2−t1) (Equation 7)
d = α × D (Equation 8)

  The process execution position calculation unit 185 can also calculate the process execution position (X, Y) based on the ratio of the time from the current time t1 to t2 and the time from the process execution time T to t2. is there. Specifically, the process execution position calculation unit 185 calculates the process execution position (X, Y) as follows.

  First, the process execution position calculation unit 185 calculates a distance d from the position (x2, y2) to the process execution position (X, Y) by the following (Expression 9) to (Expression 10). Then, the process execution position calculation unit 185 calculates a position advanced by a distance d along the route from the position (x2, y2) to the position (x1, y1) as the process execution position (X, Y).

α = (t2-T) / (t2-t1) (Equation 9)
d = α × D (Equation 10)

  This makes it possible to calculate a processing execution position with less error.

  Even when the position information acquisition apparatus 100 calculates the processing execution position (X, Y) on the assumption that the position information acquisition apparatus 100 has moved between the positions (x1, y1) and (x2, y2) at a constant linear velocity, the map information It is possible to calculate the processing execution position with higher accuracy using. For example, the coordinates on the road closest to the processing execution position (X, Y) are calculated by comparing the processing execution position (X, Y) calculated in FIG. 12 with the map information. Then, the calculated coordinates are acquired as the processing execution position.

  Further, although the process execution time acquisition unit 182 acquires the process execution time using the timer 160, the time information included in the radio wave from the navigation satellite may be used as it is as the process execution time.

  The position information acquisition apparatus 100 is not limited to a mobile phone or a PDA. For example, a portable terminal such as a PND (Portable Navigation Device) or a notebook computer may be used. In addition, the position information acquisition device 100 is not limited to a portable terminal carried by a user, and may be a device that is installed and used in a moving body such as a car or a train, such as a car navigation device or a drive recorder. .

  The position information acquisition apparatus 100 of the present embodiment may be realized by a dedicated system or an ordinary computer system. For example, the position information acquisition apparatus 100 is configured by storing and distributing a program for performing the above-described operation in a computer-readable recording medium, installing the program in a computer, and executing the above-described processing. May be. Further, it may be stored in a disk device provided in a server device on a network such as the Internet so that it can be downloaded to a computer, for example. Further, the above-described functions may be realized by joint operation of the OS and application software. In this case, only the part other than the OS may be stored and distributed in a medium, or may be downloaded to a computer.

  As a recording medium for recording the program, USB memory, flexible disk, CD, DVD, Blu-ray Disc (registered trademark), MO, SD card, Memory Stick (registered trademark), magnetic disk, optical disk, magneto-optical disk Computer-readable recording media such as semiconductor memory and magnetic tape can be used.

  Various embodiments and modifications can be made to the present invention without departing from the broad spirit and scope of the present invention. Further, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

DESCRIPTION OF SYMBOLS 100 Position information acquisition apparatus 110 Reception part 120 Storage part 130 Display part 140 Operation part 141 Position input sensor 142 Menu button 143 Power button 150 Imaging part 160 Timer 170 Battery 180 Control part 181 Movement history acquisition part 182 Process execution time acquisition part 183 Image Imaging processing unit 184 Operation history acquisition unit 185 Processing execution position calculation unit

Claims (7)

A movement history acquisition unit that acquires current time and current position information at the current time at predetermined time intervals;
A process execution time acquisition unit that acquires a process execution time when executing a predetermined process;
First current position information acquired at a time before the process execution time, a first current time corresponding to the first current position information, and a first current position acquired at a time after the process execution time The process execution for calculating the current position at the process execution time as the process execution position based on the second current position information, the second current time corresponding to the second current position information, and the process execution time. A position calculation unit;
An operation history acquisition unit that stores the process execution position and the process execution time corresponding to the process execution position in association with each other.
A position information acquisition apparatus characterized by that. The processing execution position calculation unit
A time from the first current time to the second current time and a time from the first current time to the process execution time or a time from the process execution time to the second current time. Calculate the ratio,
Based on the calculated ratio, the processing execution position is calculated by internally dividing a straight line connecting the position indicated by the first current position information and the position indicated by the second current position information.
The position information acquisition apparatus according to claim 1. A road information storage unit for storing road information;
The processing execution position calculation unit
Based on the road information stored in the road information storage unit, determine a route connecting the position indicated by the first current position information and the position indicated by the second current position information;
A ratio of the time from the first current time to the second current time and the time from the first current time to the process execution time or the time from the process execution time to the second current time To calculate
Based on the calculated ratio, the processing execution position is calculated by internally dividing a path connecting the position indicated by the first current position information and the position indicated by the second current position information.
The position information acquisition apparatus according to claim 1. The operation history acquisition unit
It is determined whether or not the processing execution time is within a predetermined time from the first acquisition time, and when it is determined that the processing execution time is within the predetermined time, the first current position information is acquired as the processing execution position If the process execution time is within a predetermined time from the second acquisition time, and if it is determined that the process execution time is within the predetermined time, the second current position information is determined as the process execution position. If it is neither of them, the position calculated by the process execution position calculation unit is acquired as the process execution position,
Storing the acquired process execution position in association with the process execution time corresponding to the process execution position;
The position information acquisition apparatus according to claim 1, wherein the position information acquisition apparatus is a position information acquisition apparatus. The predetermined process is a process that requires a predetermined time width from the start of the process to the end of the process,
The process execution time acquisition unit acquires a plurality of different process execution times from the process start to the process end,
The operation history acquisition unit acquires the process execution position for each of the process execution times acquired by the process execution time acquisition unit.
The position information acquisition apparatus according to claim 1, wherein the position information acquisition apparatus is a position information acquisition apparatus. A movement history acquisition step of acquiring the current time and the current position information at the current time at a predetermined time interval;
A process execution time acquisition step for acquiring a process execution time when executing a predetermined process;
First current position information acquired at a time before the process execution time, a first current time corresponding to the first current position information, and a first current position acquired at a time after the process execution time The process execution for calculating the current position at the process execution time as the process execution position based on the second current position information, the second current time corresponding to the second current position information, and the process execution time. A position calculating step;
An operation history acquisition step of storing the process execution position and the process execution time corresponding to the process execution position in association with each other.
A position information acquisition method characterized by that. On the computer,
A movement history acquisition function for acquiring current time and current position information at the current time at predetermined time intervals;
A process execution time acquisition function for acquiring a process execution time when executing a predetermined process;
First current position information acquired at a time before the process execution time, a first current time corresponding to the first current position information, and a first current position acquired at a time after the process execution time The process execution for calculating the current position at the process execution time as the process execution position based on the second current position information, the second current time corresponding to the second current position information, and the process execution time. Position calculation function,
An operation history acquisition function for storing the processing execution position in association with the processing execution time corresponding to the processing execution position;
A program that executes