JP6025777B2 - POSITIONING DEVICE, POSITIONING METHOD, AND POSITIONING PROGRAM - Google Patents

Description

  The present invention relates to a positioning device, a positioning method, and a positioning program that measure position information.

Conventionally, a positioning device that receives a satellite signal transmitted from a GPS (Global Positioning System) satellite and measures a current position based on the received satellite signal is known (for example, Patent Document 1).
The measurement process that receives satellite signals and measures the current position consumes a large amount of power. For this reason, the positioning device of Patent Literature 1 includes an acceleration sensor, and based on the detection result of the acceleration sensor, it is determined whether or not the user is wearing the positioning device. Then, when it is determined that the user does not wear the positioning device, the execution of the measurement process is stopped. Thereby, it is possible to prevent the measurement process from being performed wastefully while the user is not using the positioning device, and to reduce power consumption.

JP 2012-194182 A

However, in the positioning device of Patent Document 1, when the user wears the positioning device and uses it, if acceleration is detected by the user's movement, the measurement process is executed even when the user is not moving. The power consumption during use cannot be reduced.
In addition, as a method of reducing power consumption during use, it is conceivable to increase the measurement interval. However, if the measurement interval is simply increased, the interval between the measured positions may be used when the user is moving. In some cases, the movement path cannot be accurately detected.

  It is an object of the present invention to provide a positioning device, a positioning method, and a positioning program that can accurately detect a moving route and reduce power consumption.

The positioning device of the present invention includes a position measurement device that measures a current position, an identification information acquisition unit that acquires identification information for identifying the access point from access points installed in the vicinity, and a measurement according to the identification information A measurement interval acquisition unit that acquires an interval; and a measurement control unit that executes a measurement process of operating the position measurement device to acquire position information of a current position based on the measurement interval, and acquiring the measurement interval A plurality of pieces of position information associated with the identification information acquired by the identification information acquisition unit from a storage unit that stores the position information acquired by the position measurement device in association with the identification information; The measurement interval set such that the interval becomes longer as the variation of the plurality of pieces of position information becomes smaller is obtained .

  According to the present invention, the measurement process can be executed based on the measurement interval according to the position of the user, so that it is relatively short in an area where the user often moves, such as an area in the middle of a commuting route or a school route. Measurement processing can be executed at intervals, and the movement path can be detected with high accuracy. In areas where users are often staying, such as at home or work, measurement processing can be executed at relatively long intervals, and power consumption can be reduced.

It is a figure which shows the structure of the positioning system which concerns on this embodiment. It is a figure which shows the structure of the positioning apparatus in the said embodiment. It is a flowchart which shows the positioning process in the said embodiment. It is a figure for demonstrating the acquisition method of the measurement interval in the said embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a configuration of a positioning system according to the present embodiment.
As shown in FIG. 1, the positioning system includes a GPS satellite 2 that is one of position information satellites, a positioning device 1 that receives satellite signals from the GPS satellite 2 and acquires position information indicating the current position, and a network. A plurality of Wi-Fi (Wireless Fidelity) that can be connected and wirelessly connected to the positioning device 1 and an access point 3 such as a mobile phone base station are provided.
Here, the measurement process for receiving the satellite signal and acquiring the position information consumes a large amount of power as compared with, for example, communication with the access point 3 and detection of acceleration.
For this reason, the positioning device 1 controls the interval at which the position information is measured.

[Configuration of positioning device]
In the present embodiment, the positioning device 1 is a portable information device such as a mobile phone, a smartphone (multifunctional mobile phone), a tablet, or a notebook PC (personal computer).
FIG. 2 is a diagram illustrating a configuration of the positioning device 1.
As shown in FIG. 2, the positioning device 1 includes a display device 10, an input device 20, a transmission / reception device 30, an acceleration sensor 40, a GPS reception device 50, a storage device 60, and a control device 70.

The display device 10 includes a display panel such as a liquid crystal panel, and displays various types of information under the control of the control device 70.
The input device 20 includes a button provided on the outer surface of the casing of the positioning device 1 and a touch panel provided according to an image display area on the display device 10. Then, the input device 20 outputs an operation signal corresponding to the user input operation to the buttons and the touch panel to the control device 70.
The transmission / reception device 30 includes a communication module that is wirelessly connected to the access point 3.
The acceleration sensor 40 detects the acceleration of the positioning device 1 and outputs the detected acceleration to the control device 70.

  The GPS receiver 50 constitutes the position measuring device of the present invention, and captures at least three, preferably four or more GPS satellites 2 from a plurality of GPS satellites 2 orbiting the earth over a predetermined orbit. Then, the satellite signal transmitted from each GPS satellite 2 is demodulated to obtain positioning calculation information including ephemeris. Then, using the obtained positioning calculation information, a known positioning calculation is performed to obtain position information (latitude, longitude, etc.) indicating the current position of the positioning device 1. Then, the acquired position information is output to the control device 70.

The storage device 60 is configured by a flash memory or the like, and stores various programs and information necessary for the operation of the positioning device 1.
The storage device 60 includes an accumulation unit 61 that accumulates identification information and position information. Table 1 shows data stored in the storage unit 61.

As shown in Table 1, the storage unit 61 includes identification information (WiFi “A”, WiFi “B”...) For identifying the access point 3 and position information (latitude, longitude, etc.) acquired by the GPS receiver 50. Are stored in association with each other.
This identification information is a history of identification information acquired from the access point 3 when the control device 70 accesses the access point 3.
The location information is a history of location information acquired by the GPS receiver 50, and is associated with the identification information of the access point 3 acquired by the control device 70 when the location information is acquired. Accumulated.
For example, the location information stored in association with WiFi “A” is located near the Wi-Fi access point 3 identified by the WiFi “A” and the positioning device 1 communicates with the access point 3. This is the position information acquired by the GPS receiving device 50 in a possible state.

[Configuration of control device]
The control device 70 controls the operation of the positioning device 1 and includes an arithmetic device such as a CPU (Central Processing Unit). The control device 70 functions as a measurement control unit 71, a movement determination unit 72, an identification information acquisition unit 73, and a measurement interval acquisition unit 74 when the CPU executes a program stored in the storage device 60.

The measurement control unit 71 operates the GPS receiver 50 to receive a satellite signal, and executes measurement processing for acquiring position information indicating the current position based on the received satellite signal based on the measurement interval (pf). To do. The measurement interval (pf) is a reference interval for executing the measurement process, and is acquired by the measurement interval acquisition unit 74 as described later.
Then, the measurement control unit 71 accumulates the position information acquired in the measurement process in the accumulation unit 61.

The movement determination unit 72 determines whether or not the positioning device 1 is moving.
Specifically, the movement determination unit 72 operates the acceleration sensor 40 at a predetermined interval (for example, every 5 minutes), and determines the movement state of the positioning device 1 based on the acceleration (a) detected by the acceleration sensor 40. .

  When the movement determination unit 72 determines that the positioning device 1 is moving, the identification information acquisition unit 73 identifies the access point 3 from the access points 3 (communication access points 3) installed in the vicinity. Acquire identification information. Then, the acquired identification information is stored in the storage unit 61.

  The measurement interval acquisition unit 74 acquires a measurement interval (pf) according to the identification information acquired by the identification information acquisition unit 73.

[Positioning process]
Next, the positioning process performed by the positioning device 1 will be described.
FIG. 3 is a flowchart showing the positioning process.
Note that when the positioning process is started, the acceleration sensor 40 and the GPS receiver 50 are not operating.
First, the movement determination unit 72 operates the acceleration sensor 40. As a result, the acceleration sensor 40 detects the acceleration (a) of the positioning device 1 and outputs the detection result to the movement determination unit 72. Then, the movement determination unit 72 determines whether or not the acceleration (a) detected by the acceleration sensor 40 is equal to or greater than a predetermined threshold (θa) (step S11). Here, when the process of step S <b> 11 ends, the movement determination unit 72 stops the operation of the acceleration sensor 40.

  When the positioning device 1 is not moving, since the acceleration (a) is “0”, it is determined as NO in Step S11, and the movement determining unit 72 waits for a predetermined period (for example, 5 minutes) (Step S11). S12), the process returns to step S11. That is, the movement determination unit 72 repeatedly executes the process of step S11 until the positioning device 1 moves and it is determined YES in step S11.

  When the positioning device 1 moves and the acceleration (a) becomes equal to or greater than the threshold value (θa), YES is determined in step S11, and the identification information acquisition unit 73 is connected to the access point 3 (access point 3 with which communication is possible). ) To obtain identification information for identifying the access point 3 (step S13). When the access point 3 is a base station, the base station includes “area ID” and “cell ID” as identification information. In this embodiment, the identification information acquisition unit 73 sets “cell ID”. get. Here, a set of identification information for identifying the access point 3 is defined as (f).

  Next, the identification information acquisition unit 73 updates the set (F) of identification information of the access point 3 stored in the storage unit 61 with the set (f) of identification information acquired in step S13 (step S14). ). That is, if there is identification information that is not included in the set (F) among the identification information of the set (f), this identification information is written into the set (F).

  Next, the measurement control unit 71 determines whether or not all the identification information of the set (f) acquired in step S13 is included in the identification information associated with the position information in the set (F). (Step S15).

  When it determines with NO by step S15, the measurement control part 71 operates the GPS receiver 50, performs a measurement process, and acquires the positional information (df) which shows a present position (step S16). Here, when the process of step S <b> 16 ends, the measurement control unit 71 stops the operation of the GPS receiving device 50.

Next, the measurement control unit 71 writes the acquired position information (df) in the position information (Df) of the storage unit 61 (step S17).
At this time, the measurement control unit 71 writes the position information (df) in association with each piece of identification information of the set (f). For example, when WiFi “A” and WiFi “B” are included in the set (f), the measurement control unit 71 includes the identification information of WiFi “A” and WiFi “B” stored in the storage unit 61. Position information (df) is written in association with each other. And the measurement control part 71 advances a process to step S12.

  On the other hand, when it determines with YES by step S15, the measurement space | interval acquisition part 74 reads position information (Df) from the storage part 61 (step S18).

  Next, the measurement interval acquisition unit 74 acquires a plurality of corresponding position information from the position information (Df) for each piece of identification information of the set (f) acquired in step S13. Then, for each identification information, a measurement interval (pf) corresponding to the variation of the acquired plurality of position information is acquired (step S19).

Here, an example of a method for obtaining the measurement interval (pf) will be described.
FIG. 4 is a diagram for explaining a method for acquiring a measurement interval, and is an example showing a position (P) on a map indicated by position information associated with one piece of identification information. State 1 and state 2 indicate positions (P) associated with different access points 3.
The measurement interval acquisition unit 74 first calculates the barycentric position (bc) of each position (P). Then, a position (P1) farthest from the center of gravity position (bc) and a position (P2) farthest from the center of gravity are specified. Then, a distance (d1) between the position (P1) and the position (P2) is calculated, and a measurement interval (pf) corresponding to the distance (d1) is calculated and acquired.

Here, in the case of the state 1, since the distance (d1) is relatively short, it can be determined that the variation in position is small. In this case, it can be determined that the user who has the positioning device 1 often stays near the access point 3 identified by the corresponding identification information. In this case, it is not necessary to frequently perform the measurement process, and power consumption can be reduced by reducing the frequency, so that the measurement interval (pf) becomes long.
In the case of the state 2, since the distance (d1) is relatively long, it can be determined that the position variation is large. In this case, when the user who has the positioning device 1 is located near the access point 3 identified by the corresponding identification information, it can be determined that the user is often moving. In this case, in order to detect the movement route with high accuracy, it is necessary to frequently perform measurement processing, and therefore the measurement interval (pf) is shortened.

Next, the measurement control unit 71 calculates the elapsed time (tf) from the previous execution of the measurement process in step S16 (step S20), and the elapsed time (tf) is the measurement interval calculated in step S19 ( It is determined whether or not pf) or higher (step S21).
Here, when a plurality of pieces of identification information are included in the set (f) and a plurality of measurement intervals (pf) are acquired in step S19, is the elapsed time (tf) equal to or longer than the longest measurement interval? Determine whether or not.

When it determines with YES by step S21, the measurement control part 71 advances a process to step S16.
On the other hand, when it is determined NO in step S21, the measurement control unit 71 advances the process to step S12.
Thereby, the measurement process of step S16 is executed based on the measurement interval (pf) except when determined to be NO in step S15.

[Operational effects of this embodiment]
In the present embodiment, the measurement interval acquisition unit 74 acquires a measurement interval (pf) according to the identification information of the access point 3 acquired by the identification information acquisition unit 73, and the measurement control unit 71 acquires the measurement interval (pf). The measurement process is executed based on the above.
According to this, since the measurement process can be executed based on the measurement interval according to the position of the user, in a region where the user is frequently moving, such as a commuting route or a region in the middle of the commuting route, a relatively short interval. The measurement process can be executed with and the movement route can be detected with high accuracy. In areas where users are often staying, such as at home or work, measurement processing can be executed at relatively long intervals, and power consumption can be reduced.

In the present embodiment, the measurement interval acquisition unit 74 acquires a plurality of pieces of position information associated with the identification information acquired by the identification information acquisition unit 73 from the storage unit 61, and responds to variations in the acquired plurality of position information. The measurement interval (pf) obtained is acquired.
Since the variation in the position information reflects the user's behavior habits, according to the above configuration, the measurement interval (pf) suitable for the user's behavior habits can be acquired.

In the present embodiment, the identification information acquisition unit 73 acquires the identification information when the movement determination unit 72 determines that the positioning device 1 is moving.
According to this, when the positioning device 1 is not moving and it is not necessary to perform the positioning process, the identification information is not acquired and the positioning process is not executed. For this reason, it is possible to prevent the positioning process from being performed unnecessarily while the positioning device 1 is not moving, and to reduce power consumption.

In the present embodiment, the movement determination unit 72 determines whether or not the positioning device is moving based on the detection result of the acceleration sensor 40.
Since the acceleration sensor 40 has relatively small power consumption, according to the present embodiment, the power consumption can be further reduced.
In the present embodiment, since the movement determination unit 72 operates the acceleration sensor 40 at a predetermined interval (for example, 5 minutes), the power consumption can be further reduced as compared with the case where the acceleration sensor 40 is always operated.

In this embodiment, when a plurality of pieces of identification information are acquired by the identification information acquisition unit 73, the measurement interval acquisition unit 74 acquires a measurement interval (pf) for each of the acquired identification information, and the measurement control unit 71 performs a measurement process based on the longest measurement interval (pf) among the acquired measurement intervals (pf).
According to this, compared with the case where a measurement process is performed based on the measurement interval different from the longest measurement interval, the interval of a measurement process can be lengthened and power consumption can be reduced.

[Modification]
In addition, this invention is not limited to embodiment mentioned above, In the range which can achieve the objective of this invention, the deformation | transformation shown below is also included.

[Modification 1]
In the above embodiment, the measurement interval acquisition unit 74 acquires the measurement interval (pf) according to the variation of the plurality of pieces of position information acquired from the storage unit 61, but the present invention is not limited to this.
For example, the measurement interval acquisition unit 74 may acquire a measurement interval that is a predetermined fixed value for the identification information, or may acquire a measurement interval preset by the user for the identification information. .

[Modification 2]
In the above embodiment, the identification information acquisition unit 73 acquires the identification information when the movement determination unit 72 determines that the positioning device 1 is moving, but the present invention is not limited to this.
That is, the identification information acquisition unit 73 may acquire identification information regardless of whether or not the positioning device 1 is moving. In this case, since the positioning process is performed even when the positioning device 1 is not moving, the power consumption is increased as compared with the above embodiment, but the positioning device 1 does not need to include the movement determining unit 72, so the configuration is configured. It can be simplified.

[Modification 3]
Moreover, the identification information acquisition part 73 can detect the identification information newly acquired when the positioning apparatus 1 is not moving by acquiring identification information even when the positioning apparatus 1 is not moving. Such identification information is likely to be identification information of portable Wi-Fi possessed by another user who has passed near the user, for example.
For this reason, such identification information is registered in the list, and the identification information excluding the identification information registered in the list among the identification information acquired by the identification information acquisition unit 73 at the time of the positioning process. By accumulating in the accumulating unit 61, it is possible to prevent the portable Wi-Fi identification information possessed by other users as described above from accumulating in the accumulating unit 61. Thereby, the measurement interval acquisition unit 74 can acquire a measurement interval (pf) that is more suitable for the user.

[Modification 4]
In the above embodiment, the movement determination unit 72 determines whether or not the positioning device 1 is moving based on the detection result of the acceleration sensor 40, but the present invention is not limited to this.
For example, the movement determination unit 72 may perform the determination by detecting that the communicable access point 3 has changed.

[Modification 5]
In the above embodiment, the measurement control unit 71 executes the measurement process based on the longest measurement interval (pf) among the measurement intervals (pf) acquired by the measurement interval acquisition unit 74. It is not limited to this.
For example, the measurement control unit 71 may execute the measurement process based on the average value of the measurement intervals (pf) acquired by the measurement interval acquisition unit 74.

[Modification 6]
In the storage unit 61 of the above-described embodiment, the position information is stored together with the measurement time (or measurement time zone), and the measurement interval acquisition unit 74 is a measurement time adapted to the current time when acquiring the position information from the storage unit 61. You may make it acquire only the positional information on (or measurement time slot | zone).
According to this, the measurement interval acquisition part 74 can acquire not only a user's position but the measurement interval (pf) according to the time. For this reason, the measurement interval (pf) finely adapted to the user's behavior habit can be acquired.

[Modification 7]
In the above embodiment, the measurement interval acquisition unit 74 has the position (P1) farthest from the center of gravity position (bc) and the position farthest from the position (P) indicated by the position information acquired from the accumulation unit 61 ( Although the measurement interval (pf) corresponding to the distance (d1) to P2) is calculated and acquired, the present invention is not limited to this.
For example, the measurement interval (pf) may be calculated according to the distance between two points that are farthest from the position (P).
Alternatively, the degree of variation of the position (P) may be calculated using a known statistical method, and the measurement interval (pf) may be calculated according to the calculated degree of variation.

[Modification 8]
In the above embodiment, the measurement interval acquisition unit 74 obtains the density distribution of the position (P) indicated by the position information acquired from the accumulation unit 61, excludes a region where the density distribution is lower than a predetermined value, The measurement interval (pf) may be calculated after extracting a region having a predetermined value or more. According to this, the measurement interval (pf) can be calculated with higher accuracy.

[Modification 9]
In the above embodiment, in the positioning process, when it is determined in step S11 that the acceleration (a) is less than the threshold value (θa) (NO in step S11), the process always proceeds to step S12. It is not limited to.
For example, if it is determined in step S11 that the acceleration (a) is less than the threshold (θa) ten times continuously, the process of step S13 is performed even if the acceleration (a) is less than the threshold (θa). The identification information of the access point 3 may be acquired.
In the positioning process, if it is determined in step S21 that the elapsed time (tf) is less than the measurement time (pf) (NO in step S21), the process always proceeds to step S12. It is not limited to.
For example, if it is determined in step S21 that the elapsed time (tf) is less than the measurement time (pf) 10 times continuously, even if the elapsed time (tf) is less than the measurement time (pf), the step It progresses to S16 and may perform a measurement process.
According to these, even when the positioning device 1 is not moving, the measurement process can be executed at regular intervals.
In addition to executing the measurement process in step S16, the measurement process may be executed when a predetermined time comes. In this case, the elapsed time (tf) is measured based on the measurement process.

[Modification 10]
In the said embodiment, although the GPS receiver 50 is used as a position measuring device, this invention is not limited to this.
For example, by detecting the acceleration of the positioning device 1 continuously, the relative position with respect to the reference point is measured, and by receiving sound waves from a measuring device that measures position information or a signal source installed in a facility or the like. Also, a measuring device that measures position information can be used. Even in such a measurement apparatus, the measurement processing consumes power, and thus the effects of the present invention can be obtained.

[Modification 11]
In the above embodiment, a Wi-Fi access point and a base station are used as the access point 3, but the present invention is not limited to this.
For example, it may be a beacon installed in a facility or on a road, or portable.

[Modification 12]
In the above embodiment, the storage unit 61 is provided in the positioning device 1, but may be provided in a server connected to a network, for example.

  DESCRIPTION OF SYMBOLS 1 ... Positioning device, 3 ... Access point, 40 ... Acceleration sensor, 50 ... GPS receiver, 61 ... Accumulation part, 70 ... Control apparatus, 71 ... Measurement control part, 72 ... Movement determination part, 73 ... Identification information acquisition part, 74: Measurement interval acquisition unit.

Claims (6)

A position measuring device for measuring the current position;
An identification information acquisition unit for acquiring identification information for identifying the access point from access points installed in the surroundings;
A measurement interval acquisition unit that acquires a measurement interval according to the identification information;
A measurement control unit that operates the position measurement device to acquire position information of the current position, and executes a measurement process based on the measurement interval ;
The measurement interval acquisition unit
From the storage unit that stores the position information acquired by the position measurement device in association with the identification information, obtain a plurality of the position information associated with the identification information acquired by the identification information acquisition unit,
The positioning apparatus is configured to acquire the measurement interval set so that the interval becomes longer as the variation of the plurality of pieces of position information becomes smaller . The positioning device according to claim 1 ,
A movement determination unit for determining whether or not the positioning device is moving;
The positioning device is characterized in that the identification information acquisition unit acquires the identification information when the movement determination unit determines that the positioning device is moving. The positioning device according to claim 2 ,
The positioning device is configured to determine whether the positioning device is moving based on a detection result of an acceleration sensor that detects an acceleration of the positioning device. In the positioning apparatus of any one of Claims 1-3 ,
When a plurality of the identification information is acquired by the identification information acquisition unit,
The measurement interval acquisition unit acquires the measurement interval for each of the acquired identification information,
The said measurement control part performs the said measurement process based on the longest measurement interval among the acquired said measurement intervals. The positioning apparatus characterized by the above-mentioned. A positioning method executed by a computer,
An identification information acquisition step of acquiring identification information for identifying the access point from access points installed around;
A measurement interval acquisition step of acquiring a measurement interval according to the identification information;
A measurement control step for executing measurement processing for acquiring position information of the current position based on the measurement interval ,
In the measurement interval acquisition step,
From the storage unit that stores the position information acquired in the measurement process in association with the identification information, obtain a plurality of the position information associated with the identification information acquired in the identification information acquisition step,
The positioning method is characterized in that the measurement interval set so that the interval becomes longer as the variation of the plurality of pieces of position information becomes smaller . A positioning program for causing a computer to function as the positioning device according to any one of claims 1 to 4 .

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