JP2012088117A - Positioning system, positioning method and positioning program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent positioning by a second positioning method on a measuring position by a first positioning method from being remained unexecuted when impossibility of positioning by the second positioning method is estimated in a positioning system for determining the propriety of positioning by the second positioning method on the measuring position by the first positioning method based on a measured value of a positioning result by the second positioning method.SOLUTION: A positioning control part 210 calculates the success probability of positioning by a second positioning method and the estimated accuracy of the probability based on a measuring position to be a positioning requirement determination target acquired by positioning by a first positioning method and positioning information stored in a positioning information storage part 220, and when the estimated accuracy of success probability of positioning by the second positioning method is predetermined accuracy or less, performs positioning by the second positioning method, and stores positioning information setting the measuring position to be the positioning requirement determination target and positioning propriety by the second positioning method in a positioning information storage part 220.

Description

  The present invention relates to a positioning system, a positioning method, and a positioning program, and more particularly to a positioning system, a positioning method, and a positioning program capable of selecting a plurality of positioning methods.

  In recent years, with the advancement of mobile terminals typified by mobile phones, services based on location information have become possible. Examples of mobile phone advancement include enhancement of system providing API (Application Programming Interface) that can be used in applications, the ability to execute applications regularly and periodically, GPS (Global Positioning System), acceleration sensors Enhancement of sensor devices such as In addition, the position information can be acquired by many portable terminals through a positioning device such as GPS. By using these functions in an integrated manner, it is possible to periodically acquire the location information of the mobile terminal and record the route traveled by the user of the mobile terminal. It is possible on many portable terminals to provide such applications and services based on location information.

  When a service based on location information is provided by a mobile terminal, there is a trade-off between power consumption by positioning and positioning accuracy. There are two positioning methods that are often used in mobile terminals. The first method is GPS positioning using the position of the satellite and the propagation delay of the radio wave from the satellite, and the second method is a base using the position of the radio base station and the radio wave intensity from the radio base station. It is local positioning. GPS positioning has the advantage that high-precision positioning is possible, but it consumes a lot of power because it needs to receive radio waves from a satellite for a certain period of time and calculate the position of the mobile terminal with respect to the received radio waves. . Especially in the city, indoors, etc., there is a problem that the area where positioning is possible is limited. On the other hand, base station positioning has the advantage that positioning is possible in an area where power consumption is small and a mobile terminal can be used, but positioning accuracy is low.

  This trade-off between power consumption and positioning accuracy is problematic for some services. For example, in the life log service that periodically performs positioning and records the user's position, it is necessary to perform positioning frequently. Therefore, if GPS positioning is used as a positioning method, the power consumption of the mobile terminal is large and charging is not required. The continuous use time of is reduced. On the other hand, if base station positioning is used as a positioning method, the power consumption of the portable terminal is small, but the positioning accuracy is poor, so the quality of service is reduced.

  In order to adjust the trade-off between such power consumption and positioning accuracy, a positioning system that performs GPS positioning only when positioning with high accuracy is necessary, and performs base station positioning in other situations, for example, patents It is disclosed in Document 1 and Patent Document 2.

  Only when it is determined that the mobile communication terminal device described in Patent Document 1 and the position detection device described in Patent Document 2 are moved by base station positioning, positioning with high accuracy and high power consumption such as GPS positioning is performed. To reduce the power consumption associated with positioning.

  However, the devices described in Patent Literature 1 and Patent Literature 2 have a problem that GPS positioning is performed even in places where GPS positioning is impossible, such as in urban areas and indoors. Therefore, the possibility of GPS positioning is estimated based on the measured values of GPS positioning at the location where positioning is performed, and if GPS positioning is estimated to be impossible, GPS positioning is not performed, so that unnecessary power consumption is not performed. A positioning system that controls the execution of GPS positioning is disclosed in Patent Document 3, for example.

  The positioning system described in Patent Document 3 acquires the position of a cellular terminal based on a signal from a cellular base station, and based on the GPS positioning accuracy obtained from the measured value of GPS positioning, GPS positioning at that position is performed. The effectiveness of GPS is estimated and the execution of GPS positioning is controlled.

JP 2002-152808 A JP 2006-153695 A JP 2010-038895 A

  In the positioning system described in Patent Document 3 described above, if it is erroneously estimated that GPS positioning is impossible due to a small number of samples of measured values of GPS positioning, GPS positioning at that position is not performed. Since a correct measured value of positioning cannot be obtained, there is a problem that GPS positioning at that position is not performed even if GPS positioning is originally possible.

  The objective of this invention is providing the positioning system, the positioning method, and the positioning program which solved the problem mentioned above.

  In the positioning system of the present invention, the measurement position of the terminal acquired by positioning by the first positioning method and the success or failure of positioning by the second positioning method when the measurement position by the first positioning method is acquired. Positioning information storage means for storing one or more pieces of positioning information including positioning availability, a measurement position that is a positioning necessity determination target obtained by positioning by the first positioning method, and the positioning information storage means Based on the stored positioning information, the probability of successful positioning by the second positioning method and the estimation accuracy of the probability are calculated, and the estimation accuracy of the probability of successful positioning by the second positioning method. When the positioning information is less than or equal to a predetermined accuracy, positioning is performed by the second positioning method, and the positioning information in which the measurement position that is the positioning necessity determination target and the positioning availability by the second positioning method are set is the positioning information. Storage means And a positioning control means for saving.

  The positioning method of the present invention is the success or failure of positioning by the second positioning method when the measurement position of the terminal acquired by positioning by the first positioning method and the measuring position by the first positioning method are acquired. One or more pieces of positioning information including the positioning availability indicating, and based on the measurement position that is a positioning necessity determination target obtained by positioning by the first positioning method and the positioning information. When the probability of successful positioning by the second positioning method and the estimated accuracy of the probability are calculated, and the estimated accuracy of the probability of successful positioning by the second positioning method is less than or equal to a predetermined accuracy, the second positioning method Positioning is performed, and the positioning information in which the measurement position that is the positioning necessity determination target and the positioning availability by the second positioning method are set is stored.

  The positioning program of the present invention allows a computer to perform positioning by the second positioning method when the measurement position of the terminal acquired by positioning by the first positioning method and the measurement position by the first positioning method are acquired. One or more pieces of positioning information including whether or not positioning indicating success or failure is stored, and based on the measurement position that is a positioning necessity determination target obtained by positioning by the first positioning method and the positioning information , Calculating the probability of successful positioning by the second positioning method and the estimated accuracy of the probability, and if the estimated accuracy of the probability of successful positioning by the second positioning method is less than or equal to a predetermined accuracy, the second Positioning is performed, and the process of storing the positioning information in which the measurement position that is the positioning necessity determination target and the positioning propriety according to the second positioning method are set is executed.

  The effect of the present invention is that whether or not positioning by the second positioning method is possible at the measurement position by the first positioning method such as base station positioning based on the actual measurement value of the positioning result by the second positioning method such as GPS positioning. In the positioning system to be determined, since it is estimated that positioning by the second positioning method is impossible, it can be prevented that positioning by the second positioning method at that measurement position is not performed thereafter.

It is a block diagram which shows the characteristic structure of 1st embodiment of this invention. It is a block diagram which shows the structure of the positioning system 1 in 1st embodiment of this invention. It is a flowchart which shows the positioning process of the terminal device 100, and the positioning necessity determination process of the server apparatus 200 in 1st embodiment of this invention. It is a figure which shows the example of the positioning information in 1st embodiment of this invention. It is a figure which shows the other example of the positioning information in 1st embodiment of this invention. It is a figure which shows the example of the measurement position of positioning information and the measurement position of positioning necessity judgment object in 1st embodiment of this invention.

(First embodiment)
Next, a first embodiment of the present invention will be described in detail with reference to the drawings.

  First, the configuration of the first embodiment of the present invention will be described. FIG. 2 is a block diagram showing a configuration of the positioning system 1 according to the first embodiment of the present invention.

  Referring to FIG. 2, the positioning system 1 according to the first embodiment of the present invention includes a terminal device 100 and a server device 200. The terminal device 100 and the server device 200 are connected by a network 300. There may be a plurality of terminal devices 100.

  The terminal device 100 is a mobile terminal device that can be operated and communicated by a user, such as a mobile phone or a mobile game machine. The terminal device 100 includes a positioning execution unit 110, a first positioning unit 120, a second positioning unit 130, and a positioning result output unit 140.

  The first positioning unit 120 performs positioning by a positioning method (first positioning method) having characteristics of low accuracy, low power consumption, and a wide positioning possible area. For example, the first positioning unit 120 performs positioning by a base station positioning method in a mobile phone. When receiving the positioning instruction from the positioning execution unit 110, the first positioning unit 120 executes the positioning and returns the positioning result.

  Here, the positioning result includes latitude, longitude, and positioning accuracy. Latitude and longitude are coordinates representing the measurement position of the terminal device 100. Further, the positioning accuracy represents the reliability of the measurement position, and is usually represented by an error range. The contents of the error range differ depending on the positioning method, but here the actual position is included in a circle with a certain probability or more, centered on the latitude and longitude, and the radius being the positioning accuracy (error range). .

  The low accuracy indicates that the reliability of the positioning result by the first positioning unit 120 is low and the positioning accuracy (error range) is large. Low power consumption means that only a small amount of power is consumed when positioning is performed by the first positioning unit 120. In the case of a portable terminal, it is normally operated by a built-in battery such as a lithium ion battery. For this reason, in a positioning method that consumes a large amount of power, the battery is consumed quickly, so that low power consumption is desirable. Furthermore, having a wide positioning possible area indicates that the positioning result is likely to be obtained when the first positioning unit 120 attempts positioning. Whether positioning results can be obtained depends on the positioning method.For example, in base station positioning, positioning is possible in an environment where radio waves from the base station can be received, and there is a high possibility that positioning results will be obtained. .

  The second positioning unit 130 performs positioning by a positioning method (second positioning method) having characteristics of high accuracy, high power consumption, and a narrow positioning possible area. For example, the second positioning unit 130 performs positioning by the GPS positioning method. Similar to the first positioning unit 120, the second positioning unit 130 performs positioning when receiving a positioning instruction from the positioning execution unit 110, and returns the positioning result.

  Here, high accuracy means that the reliability of the positioning result by the second positioning unit 130 is high, and the value of positioning accuracy (error range) is small, so that it is easy to specify the location where the positioning is performed. Show. Also, high power consumption means that a large amount of power is consumed when positioning is performed by the second positioning unit 130. Therefore, in a device operating with a built-in battery such as a portable terminal, the battery is consumed quickly by repeating positioning by the second positioning unit 130. Moreover, having a narrow positioning possible area indicates that when positioning is attempted by the second positioning unit 130, the possibility of obtaining a positioning result is low. For example, in the case of GPS positioning, radio waves from a plurality of satellites must be received in order to obtain positioning results. For this reason, positioning is often not possible in urban areas where buildings are densely populated, or indoors, and GPS positioning cannot be performed in areas where the ratio of the coverage area by base stations is high as long as a person holds a mobile terminal. There are more situations.

  In addition, the characteristic of the positioning by each positioning unit is a relative index. For example, the low accuracy of the first positioning unit 120 indicates that the positioning accuracy is lower than that of the second positioning unit 130. It is not an absolute indicator.

  Hereinafter, in the first embodiment of the present invention, a case where the first positioning method is base station positioning and the second positioning method is GPS positioning will be described as an example, but each positioning method has the above-mentioned characteristics. If so, other positioning methods may be used.

  The positioning execution unit 110 periodically acquires the measurement position of the terminal device 100. The positioning execution unit 110 instructs the first positioning unit 120 to execute positioning, and transmits the positioning result to the server device 200. In addition, the positioning execution unit 110 receives the necessity of positioning by the second positioning unit 130 from the server device 200, and when the positioning by the second positioning unit 130 is required, the second positioning unit 130 executes the positioning. And the positioning result is transmitted to the server apparatus 200.

  The positioning result output unit 140 displays the positioning result obtained by the first positioning unit 120 or the second positioning unit 130 using an application (not shown) or a display that uses the positioning result included in the terminal device 100 or the server device 200. Part (not shown).

  Next, the server device 200 includes a positioning control unit 210 and a positioning information storage unit 220. The positioning control unit 210 includes a positioning method determination unit 211, a positioning success probability calculation unit 212, and a positioning success probability estimation accuracy calculation unit 213.

  The positioning information storage unit 220 stores positioning information. 4 and 5 are diagrams showing examples of positioning information in the first embodiment of the present invention. As shown in FIG. 4, the positioning information includes a positioning information ID for identifying positioning information, a terminal ID for identifying the terminal device 100 that performed positioning, and the latitude and longitude acquired by the first positioning method. The measurement position to be displayed, the positioning availability indicating the “success” or “failure” of the positioning by the second positioning method when the measurement position by the first positioning method is acquired, and the positioning time are included.

  In addition, the positioning information storage unit 220 may be configured by a relational database or the like.

  The positioning method determination unit 211 obtains the probability of successful positioning by the second positioning method (positioning success probability) and the estimation accuracy of the probability when the measurement position of the terminal device 100 is acquired by the first positioning method. Based on the above, it is determined whether or not to perform positioning by the second positioning method.

  The positioning success probability calculation unit 212 calculates a positioning success probability by the second positioning method.

  The positioning success probability estimation accuracy calculation unit 213 calculates the estimation accuracy of the positioning success probability by the second positioning method.

  Note that each of the terminal device 100 and the server device 200 may be a computer that includes a CPU (Central Processing Unit) and a storage medium that stores a program, and that operates by control based on the program.

  Further, the terminal device 100 and the server device 200 may constitute one device.

  Next, operation | movement of the positioning system 1 in 1st embodiment of this invention is demonstrated.

  Here, when the positioning information IDs “1” and “2” in FIG. 4 are stored in the positioning information storage unit 220, the terminal is set at the positioning time “2010-03-14 10:50:00”. The operation will be described by taking as an example a case where the positioning process is performed in the terminal device 100 with ID “1”.

  FIG. 3 is a flowchart showing the positioning process of the terminal device 100 and the positioning necessity determination process of the server device 200 in the first embodiment of the present invention.

  The terminal device 100 starts the positioning process when triggered by a timer or the like.

  The positioning execution unit 110 issues a positioning request to the first positioning unit 120 (step S101). The first positioning unit 120 that has received the positioning request performs positioning by the first positioning method, and returns the positioning result to the positioning execution unit 110.

  For example, when the positioning information IDs “1” and “2” in FIG. 4 are stored in the positioning information storage unit 220, the terminal ID “2010-03-14 10:50:00” It is assumed that the positioning process is performed in the terminal device 100 of “1”. The first positioning unit 120 performs positioning by base station positioning, and returns the latitude “35.65”, longitude “139.76”, and positioning accuracy “1000 m” to the positioning execution unit 110 as positioning results.

  The positioning execution unit 110 transmits the positioning result according to the first positioning method received from the first positioning unit 120 to the server device 200 (step S102). Here, the positioning execution unit 110 adds a positioning time indicating the time when positioning is performed and a terminal ID, and transmits the result to the server device 200.

  For example, the positioning execution unit 110 determines the positioning result by the base station positioning (latitude “35.65”, longitude “139.76”, positioning accuracy “1000 m”), positioning time “2010-03-14 10:50:00”, and terminal ID “1” is transmitted to the server apparatus 200.

  Next, the server device 200 receives a positioning result (positioning result of positioning necessity determination target) by the first positioning method from the terminal device 100 (step S201).

  The positioning method determination unit 211 of the positioning control unit 210 extracts the positioning information used for calculating the positioning success probability by the second positioning method from the positioning information stored in the positioning information storage unit 220 (step S202). ). Here, the positioning method determination unit 211 has a range (predetermined by the administrator or the like) in advance that the measurement position of the positioning information according to the first positioning method is received from the terminal device 100 from the measurement position of the positioning necessity determination target. The positioning information included in the range) and the positioning time included in the positioning information is extracted after the time (predetermined time) specified in advance by the administrator or the like on the basis of the current time.

  FIG. 6 is a diagram showing the measurement position of the positioning information and the measurement position of the positioning necessity determination target in the first embodiment of the present invention. In FIG. 6, the symbol “◯” indicates the measurement position according to the first positioning method of the positioning information whose positioning propriety is “successful”, and the symbol “●” indicates whether the positioning is possible according to the second positioning method. The measurement position according to the first positioning method of the positioning information with “failure”, the symbol “x” indicates the measurement position of the positioning necessity determination target.

  For example, the measurement position of the positioning information to be extracted is designated as a square range whose one side is latitude and longitude about 2000 m centering on the measurement position of the positioning necessity determination target, and the positioning time is the current time More than one hour. In this case, the positioning method determination unit 211 determines that the latitude of the measurement position is “35.64 to 35.66” and the longitude is “139.75” from the positioning information stored in the positioning information storage unit 220, as shown in FIG. Positioning information with positioning information IDs “1” and “2”, which are positioning information included in “139.77” and whose positioning time is “2010-03-14 9:50:00” or later, are extracted.

  Next, the positioning success probability estimation accuracy calculation unit 213 calculates the estimation accuracy of the positioning success probability by the second positioning method based on the positioning information extracted in step S202 (step S203). Here, as will be described later, the positioning success probability is a ratio of positioning information in which positioning success / failure by the second positioning method is “successful” in the positioning information extracted in step S202 (in the second positioning method). The ratio of the number of successful positioning to the number of positioning attempts). In addition, it is assumed that the estimation accuracy value of the positioning success probability increases according to the number of positioning information extracted in step S202.

  For example, the positioning success probability estimation accuracy calculation unit 213 sets the estimation accuracy to “2” as the number of positioning information extracted.

  In addition, the positioning success probability by the second positioning method and the estimation accuracy of the probability are determined based on the measurement position acquired by the first positioning method that is a positioning necessity determination target and the extracted positioning information. Any other method may be used as long as the probability and the estimation accuracy of the probability can be calculated. For example, the average value of the distance between the measurement position acquired by the first positioning method, which is a positioning necessity determination target, and the measurement position by the first positioning method included in the extracted positioning information is calculated, and the second positioning is performed. The estimation accuracy of the positioning success probability by the method may be reduced according to the average value.

  Next, the positioning method determination unit 211 determines whether or not the estimation accuracy calculated in step S203 is equal to or higher than a value (predetermined accuracy) specified in advance by an administrator or the like (step S204).

  Here, when the estimation accuracy is less than the predetermined value (step S204 / No), the positioning method determination unit 211 issues the positioning information ID, and the positioning information ID and the first determination necessity determination target. The terminal ID of the terminal device 100 that is the transmission source of the positioning result by the positioning method and the positioning information in which the measurement position of the positioning result is set are stored in the positioning information storage unit 220 (step S207).

  For example, when determining whether or not the estimation accuracy is “5 or more”, since the estimation accuracy calculated above is “2”, the positioning method determination unit 211 issues “3” as the positioning information ID. 4, the positioning information in which the terminal ID “1” and the measurement position (latitude “35.65”, longitude “139.76”) are set is stored in the positioning information storage unit 220 like the positioning information of the positioning information ID “3” in FIG. .

  Then, the positioning method determination unit 211 transmits “positioning required” as the positioning necessity determination result to the terminal device 100 that is the transmission result of the positioning result that is the positioning necessity determination target (step S208). Here, the positioning method determination unit 211 adds the positioning information ID to the positioning necessity determination result and transmits it to the server device 200.

  For example, the positioning method determination unit 211 transmits the positioning necessity determination result “positioning required” and the positioning information ID “3” to the terminal device 100 with the terminal ID “1”.

  Next, the positioning execution unit 110 of the terminal device 100 receives the positioning necessity determination result and the positioning information ID from the server device 200 (step S103).

  The positioning execution unit 110 determines whether the positioning necessity determination result received from the server device 200 is “positioning is necessary” or “positioning is not necessary” (step S104).

  Here, since the positioning necessity determination result is “positioning is necessary”, the positioning execution unit 110 issues a positioning request to the second positioning unit 130 (step S105). Receiving the positioning request, the second positioning unit 130 performs positioning by the second positioning method, and when positioning is successful, the positioning execution unit 110 indicates “success” and the positioning result as positioning availability by the second positioning method. If the positioning is failed, “failure” is returned to the positioning execution unit 110 as positioning availability by the second positioning method.

  The positioning execution unit 110 transmits the positioning availability (“success” or “failure”) by the second positioning method received from the second positioning unit 130 and the positioning information ID received in step S103 to the server device 200 (step S106). ). Here, the positioning execution unit 110 adds a positioning time indicating the time when positioning is performed and a terminal ID, and transmits the result to the server device 200.

  For example, if the positioning execution unit 110 succeeds in the positioning by the second positioning method, the positioning availability “success”, the positioning information ID “3”, the positioning time “2010-03-14 10:50:00”, and the terminal The ID “1” is transmitted to the server apparatus 200.

  Next, the positioning execution unit 110 determines whether positioning by the second positioning method is “success” or “failure” (step S107).

  Here, when the positioning possibility is “success” (Yes in step S107), the positioning result output unit 140 outputs the positioning result to the application or the display unit (step S108). Further, when the positioning possibility is “failure” (step S107 / No), the positioning result output unit 140 outputs the positioning result to the application or the display unit (step S109).

  The positioning method determination unit 211 of the server device 200 receives the positioning permission / inhibition by the second positioning method and the positioning information ID from the terminal device 100 (step S210).

  The positioning method determination unit 211 reads out the positioning information in which the received positioning information ID is set from the positioning information storage unit 220 and determines whether positioning by the received positioning of the second positioning method (“success” or “failure”). And positioning time are set and stored in the positioning information storage unit 220 (step S211). Here, the positioning time at which the positioning of the second positioning method transmitted by the terminal device 100 in step S106 is performed is set as the positioning time. Further, as the positioning time, the positioning time at which the positioning of the first positioning method transmitted by the terminal device 100 in step S102 or the current time may be set.

  For example, the positioning method determination unit 211 sets positioning availability “success” and positioning time “2010-03-14 10:50:00” in the positioning information of the positioning information ID “3” in FIG. Stored in the unit 220.

  Thus, when the estimation accuracy of the positioning success probability by the second positioning method is low at the measurement position that is the positioning necessity determination target, since the actual measurement value of the positioning result by the second positioning method is obtained, the second positioning method It is possible to improve the estimation accuracy of the positioning success probability by.

  On the other hand, in step S204, when the estimation accuracy of the positioning success probability by the second positioning method is equal to or higher than the predetermined value (step S204 / Yes), the positioning success probability calculation unit 212 stores the positioning information extracted in step S202. In addition, a positioning success probability by the second positioning method is calculated (step S205). Here, the positioning success probability is indicated by the ratio of positioning information in which positioning success / failure by the second positioning method is “successful” in the positioning information extracted in step S202.

  For example, when the positioning information IDs “1” to “5” in FIG. 4 are stored in the positioning information storage unit 220, the terminal ID “2010-03-14 11:10:00” It is assumed that the positioning process is performed in the terminal device 100 of “1” and the latitude “35.65” and the longitude “139.77” are obtained as the positioning results of the first positioning method that is the positioning necessity determination target. In this case, the positioning method determining unit 211 extracts the positioning information of the positioning information IDs “1” to “5” as shown in FIG. Here, since the estimation accuracy calculated by the positioning success probability estimation accuracy calculation unit 213 is “5”, the positioning success probability calculation unit 212 includes the positioning information with the positioning information IDs “1” to “5”. A positioning success probability “0.8” is calculated on the basis of the ratio of positioning information whose positioning availability by the second positioning method is “success”.

  The positioning method determination unit 211 determines whether or not the positioning success probability calculated in step S205 is equal to or higher than a value (predetermined probability) specified in advance by an administrator or the like (step S206).

  When the positioning success probability calculated by the second positioning method calculated in step S205 is greater than or equal to a predetermined value (step S206 / Yes), the positioning method determination unit 211 determines that the estimation accuracy of the positioning success probability is less than the predetermined value in step S204. In the same manner as in the case where there has been, in steps S207 and S208, “positioning required” is transmitted as the positioning necessity determination result to the terminal device 100 that is the positioning result transmission source that is the positioning necessity determination target.

  For example, when determining whether the positioning success probability is 0.8 or more, since the positioning success probability calculated by the positioning success probability calculation unit 212 is “0.8”, the positioning method determination unit 211 may The positioning necessity determination result “positioning required” is transmitted to the terminal device 100 with ID “1”.

  Thereafter, positioning by the second positioning method is performed in the terminal device 100 by the above-described steps S103 to S106, and whether positioning is possible is stored in the positioning information storage unit 220 of the server device 200 by the above-described steps S210 and S211. The Then, through the above-described steps S107 to S109, the positioning result by the second positioning method or the first positioning method is output to the application or the display unit according to the positioning possibility.

  In addition, when the positioning success probability by the second positioning method calculated in step S205 is less than a predetermined value (step S206 / No), the positioning method determination unit 211 displays the positioning result by the determined first positioning method. “Positioning unnecessary” is transmitted as a positioning necessity determination result to the terminal device 100 of the transmission source (step S209).

  For example, when the positioning information IDs “1” to “5” in FIG. 5 are stored in the positioning information storage unit 220, the terminal ID “2010-03-14 11:20:00” It is assumed that the positioning process is performed in the terminal device 100 of “1” and the latitude “35.65” and the longitude “139.77” are obtained as the positioning results of the first positioning method that is the positioning necessity determination target. In this case, the positioning method determining unit 211 extracts the positioning information of the positioning information IDs “1” to “5” as shown in FIG. Here, since the estimation accuracy calculated by the positioning success probability estimation accuracy calculation unit 213 is “5”, the positioning success probability calculation unit 212 includes the positioning information with the positioning information IDs “1” to “5”. The positioning success probability “0.4” is calculated based on the ratio of the positioning information whose positioning availability by the second positioning method is “success”.

  Since the positioning success probability calculated by the positioning success probability calculation unit 212 is “0.4”, the positioning method determination unit 211 sends a positioning necessity determination result “positioning unnecessary” to the terminal device 100 with the terminal ID “1”. Send.

  In this case, since the positioning necessity determination result received from the server device 200 is “positioning not required” in step S104, the positioning result output unit 140 of the terminal device 100 outputs the positioning result by the first positioning method to the application or And output to the display unit (step S109), and the process is terminated.

  In this way, when the estimation accuracy of the positioning success probability by the second positioning method is high at the measurement position that is the positioning necessity determination target, the necessity of positioning by the second positioning method according to the positioning success probability by the second positioning method. Is determined. When the positioning success probability according to the second positioning method is high, positioning according to the second positioning method is performed, and when the positioning success probability according to the second positioning method is low, positioning according to the second positioning method is performed. Absent. For this reason, possibility that the positioning by the 2nd positioning system will be performed in the position where positioning by the 2nd positioning system cannot be performed becomes low, and the power consumption of terminal unit 100 can be controlled.

  Thus, the operation of the first embodiment of the present invention is completed.

  Next, a characteristic configuration of the first embodiment of the present invention will be described. FIG. 1 is a block diagram showing a characteristic configuration of the first embodiment of the present invention.

  Referring to FIG. 1, the positioning system 1 includes a positioning information storage unit 220 and a positioning control unit 210.

  Here, the positioning information storage unit 220 performs the positioning of the terminal acquired by the positioning by the first positioning method and the positioning by the second positioning method when the measuring position by the first positioning method is acquired. One or more pieces of positioning information including whether or not positioning indicating success or failure is stored.

  The positioning control unit 210 uses the second positioning method based on the measurement position that is the positioning necessity determination target acquired by the positioning by the first positioning method and the positioning information stored in the positioning information storage unit 220. The probability that the positioning is successful and the estimation accuracy of the probability are calculated. If the estimation accuracy of the probability that the positioning by the second positioning method is successful is less than or equal to a predetermined accuracy, the positioning by the second positioning method is performed and the positioning is performed. The positioning information in which the measurement position that is the necessity determination target and the positioning availability by the second positioning method are set is stored in the positioning information storage unit 220.

  According to the first embodiment of the present invention, based on the actual measurement value of the positioning result by the second positioning method such as GPS positioning, the second position at the measurement position by the first positioning method such as base station positioning is used. In the positioning system that determines whether or not positioning by the positioning method is possible, since it is estimated that positioning by the second positioning method is impossible, the positioning by the second positioning method at the measurement position is not performed thereafter. Can be prevented. The reason is that the positioning control unit 210 uses the second positioning based on the measurement position of the positioning necessity determination target acquired by the positioning by the first positioning method and the positioning information stored in the positioning information storage unit 220. Calculate the probability of successful positioning by the positioning method and the estimated accuracy of the probability, and perform the positioning by the second positioning method if the estimated accuracy of the probability of successful positioning by the second positioning method is less than a predetermined accuracy This is because the positioning information in which the measurement position that is the positioning necessity determination target and the positioning availability by the second positioning method are set is stored in the positioning information storage unit 220.

  Further, according to the first embodiment of the present invention, it is possible to perform positioning by a highly accurate positioning method while suppressing power consumption of the terminal device 100. This is because the positioning control unit 210 performs positioning by the second positioning method when the probability of successful positioning by the second positioning method is equal to or higher than a predetermined probability.

  Further, according to the first embodiment of the present invention, when the positioning possibility by the second positioning method is improved with time change, the positioning by the second positioning method can be performed. The reason is that the measurement position acquired by the first positioning method is within a predetermined range from the measurement position of the positioning necessity determination target, and the positioning information whose positioning time is after the predetermined time is extracted and extracted. This is because the probability of successful positioning by the second positioning method and the estimation accuracy of the probability are calculated based on the positioning information.

  Although the present invention has been described with reference to the embodiment, the present invention is not limited to the above embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  For example, in the first embodiment of the present invention, the server device 200 calculates the positioning success probability that the positioning by the second positioning method is successful and the estimation accuracy of the probability, and the positioning by the second positioning method. Necessity judgment is performed. On the other hand, the terminal device 100 may perform the calculation of the positioning success probability and the estimation accuracy of the probability, and the determination of the necessity of positioning by the second positioning method. In this case, the terminal device 100 acquires the positioning information from the positioning information storage unit 220 of the server device 200, and calculates the positioning success probability and the estimation accuracy of the probability.

  In addition, the terminal device 100 stores in advance a positioning success probability that the positioning by the second positioning method calculated by the server device 200 for a plurality of positions around the measurement position of the terminal device 100 and the estimation accuracy of the probability are in advance. It may be acquired from the device 200 and held, and the necessity of positioning by the second positioning method may be determined. In this case, when the terminal device 100 acquires the measurement position based on the first positioning method, which is the positioning necessity determination target, the positioning success probability that the positioning based on the second positioning method acquired in advance from the server device 200 is successful. Then, the positioning success probability and the estimation accuracy for the measurement position are extracted from the estimation accuracy of the probability, and the necessity of positioning by the second positioning method is determined. Thereby, it is possible to improve the estimation accuracy of the possibility of positioning by the second positioning method while reducing the number of times of communication between the terminal device 100 and the server device 200.

  The present invention can be applied to a positioning system that periodically performs highly accurate positioning.

DESCRIPTION OF SYMBOLS 1 Positioning system 100 Terminal device 110 Positioning execution part 120 1st positioning part 130 2nd positioning part 140 Positioning result output part 200 Server apparatus 210 Positioning control part 211 Positioning method determination part 212 Positioning success probability calculation part 213 Positioning success probability estimation accuracy calculation Unit 220 positioning information storage unit 300 network

Claims (10)

The measurement position of the terminal acquired by positioning by the first positioning method, and positioning availability indicating the success or failure of positioning by the second positioning method when the measurement position by the first positioning method is acquired. Positioning information storage means for storing one or more positioning information including;
Successful positioning by the second positioning method based on the measurement position that is a positioning necessity determination target obtained by positioning by the first positioning method and the positioning information stored in the positioning information storage means If the estimation accuracy of the probability that the positioning by the second positioning method is successful is less than or equal to a predetermined accuracy, the positioning by the second positioning method is performed, and the positioning required A positioning system comprising: a positioning control unit that stores the positioning information in which the measurement position that is a rejection determination target and the positioning availability by the second positioning method are set in the positioning information storage unit. The positioning control means includes
From the one or more positioning information, extracting the positioning information that the measurement position acquired by the first positioning method is within a predetermined range from the measurement position of the positioning necessity determination target,
The positioning system according to claim 1, wherein the probability of successful positioning by the second positioning method and the estimation accuracy of the probability are calculated based on the extracted positioning information. Each of the positioning information includes a positioning time related to the positioning information,
The positioning control means includes
Positioning information obtained from the one or more pieces of positioning information by the first positioning method is within a predetermined range from the measurement position subject to positioning necessity determination, and the positioning time is after a predetermined time. The positioning system according to claim 2, wherein the position is extracted. The positioning control means includes
Of the extracted positioning information, based on the ratio of positioning information indicating that positioning by the second positioning method indicates success, the probability of successful positioning by the second positioning method is calculated,
The positioning system according to claim 2 or 3, wherein the estimation accuracy is calculated so as to increase according to the number of the extracted positioning information. The positioning control means further performs positioning by the second positioning method when the probability of successful positioning by the second positioning method is a predetermined probability or more,
The positioning system according to any one of claims 1 to 4, further comprising positioning result output means for outputting a measurement position acquired by positioning by the second positioning method. The measurement position of the terminal acquired by positioning by the first positioning method, and positioning availability indicating the success or failure of positioning by the second positioning method when the measurement position by the first positioning method is acquired. Store one or more positioning information including,
Based on the measurement position that is a positioning necessity determination target obtained by positioning by the first positioning method and the positioning information, the probability that the positioning by the second positioning method is successful, and the estimation accuracy of the probability, If the estimated accuracy of the probability that the positioning by the second positioning method is successful is not more than a predetermined accuracy, the positioning by the second positioning method is performed, and the measurement position that is the positioning necessity determination target and the A positioning method for storing the positioning information in which positioning is determined by the second positioning method. When calculating the probability of successful positioning by the second positioning method and the estimation accuracy of the probability,
From the one or more positioning information, extracting the positioning information that the measurement position acquired by the first positioning method is within a predetermined range from the measurement position of the positioning necessity determination target,
The positioning method according to claim 6, wherein the probability that the positioning by the second positioning method is successful and the estimation accuracy of the probability are calculated based on the extracted positioning information. On the computer,
The measurement position of the terminal acquired by positioning by the first positioning method, and positioning availability indicating the success or failure of positioning by the second positioning method when the measurement position by the first positioning method is acquired. Store one or more positioning information including,
Based on the measurement position that is a positioning necessity determination target obtained by positioning by the first positioning method and the positioning information, the probability that the positioning by the second positioning method is successful, and the estimation accuracy of the probability, If the estimated accuracy of the probability that the positioning by the second positioning method is successful is not more than a predetermined accuracy, the positioning by the second positioning method is performed, and the measurement position that is the positioning necessity determination target and the A positioning program for executing processing for storing the positioning information in which positioning permission / inhibition according to the second positioning method is set. When calculating the probability of successful positioning by the second positioning method and the estimation accuracy of the probability,
From the one or more positioning information, extracting the positioning information that the measurement position acquired by the first positioning method is within a predetermined range from the measurement position of the positioning necessity determination target,
The positioning program according to claim 8, wherein the probability of successful positioning by the second positioning method and the estimation accuracy of the probability are calculated based on the extracted positioning information. Each of the positioning information includes a positioning time related to the positioning information,
When calculating the probability of successful positioning by the second positioning method and the estimation accuracy of the probability,
Positioning information obtained from the one or more pieces of positioning information by the first positioning method is within a predetermined range from the measurement position subject to positioning necessity determination, and the positioning time is after a predetermined time. 10. The positioning program according to claim 9, wherein the positioning program is extracted.

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