JP2011081746A - Position information correction system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a position information correction system which can precisely correct position information of a pedestrian even when a region for pedestrians, and the like are not set. <P>SOLUTION: A server device successively stores position information received from a mobile terminal and precision information in association with time information and, with respect to position information (marked with an inverted black triangle) wherein corresponding precision information does not satisfy a prescribed precision, out of position information stored in a storage means, and preceding position information (marked with a black circle) temporally preceding this piece of position information and succeeding position information (marked with a black circle) temporally succeeding the piece of position information, which are associated with precision information satisfying the prescribed precision, are extracted and corrected to an estimated position (marked with a white square) on the basis of the preceding position information, the succeeding position information, and corresponding time information. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technique for accurately correcting detected pedestrian position information.

  In recent years, the functions of mobile phones have evolved, and mobile phones with a GPS function that detect the position of a terminal have also appeared, making it possible to grasp the position of a pedestrian in possession. However, since GPS receives a radio wave from a GPS satellite and detects a position, an accurate position may not be required in a valley of a building such as a building or a road under an elevated road.

  In order to solve the above problems, a technique has been developed in which the position of a pedestrian is measured and the position is identified by associating it with an attribute such as a road area within the estimation error range (see Patent Document 1). .

JP 2009-150663 PR

  However, the technique described in Patent Document 1 has a problem that the position cannot be specified when an attribute such as a road area for a pedestrian is not set.

  Therefore, an object of the present invention is to provide a position information correction system capable of accurately correcting position information of a pedestrian without setting a pedestrian area or the like.

  In order to solve the above-described problem, in the first aspect of the present invention, a mobile terminal having a position detection function and a server device are connected via a network, and the server device receives position information received from the mobile terminal and When there is a storage unit that stores accuracy information in association with time information, and the position information stored in the storage unit does not satisfy the predetermined accuracy, the position information , Each of the preceding position information and the succeeding position information, each of which precedes and follows in time and the accuracy information satisfies the predetermined accuracy, and based on the preceding position information, the succeeding position information and the corresponding time information, A position information correction system having continuous position correction means for correcting the position information is provided.

  According to the first aspect of the present invention, the position information acquired from the mobile terminal is sequentially stored together with the accuracy information and the time information, and the position information and the time information before and after the high accuracy information are stored for the position information with the low accuracy information. Since it is used and corrected, it is possible to accurately correct the position information of the pedestrian without setting the area for the pedestrian.

  Further, according to the second aspect of the present invention, in the position information correction system according to the first aspect of the present invention, the storage means corrects the corrected position information and the corrected position information corrected by the continuous position correction means. Pre-correction position information, which is previous position information, is stored in association with each other, and the server device has position information received from the mobile terminal within a predetermined distance from the pre-correction position information stored in the storage unit. When the position information before correction exists within a predetermined distance, the received position information is changed to the same position (value) as the position information after correction corresponding to the position information before correction. It further has a single position correcting means.

  According to the second aspect of the present invention, the position information before correction and the position information after correction are stored in association with each other, and the received position information is received when the position information received separately is within a predetermined distance from the position information before correction. The corrected position information is changed to the same position as the corrected position information corresponding to the position information before correction, so that the position information received alone is corrected to the correct position without the previous and subsequent information. Is possible.

  According to the present invention, there is an effect that it is possible to accurately correct the position information of the pedestrian without setting the area for the pedestrian.

It is a block diagram which shows one Embodiment of the positional information correction system which concerns on this invention. It is a figure which shows the mode of the information correct | amended by the continuous position correction | amendment means 12. FIG. It is a conceptual diagram of the correction | amendment by the continuous position correction means 12. FIG. It is a figure which shows the mode of the information changed by the single position correction means. It is a conceptual diagram of the change by the single position correction means 13. It is a block diagram of a real space information clipping system according to an application example of the present invention.

(1. System configuration)
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a position information correction system according to the present invention. The position information correction system shown in FIG. 1 includes a server device 10, a mobile terminal 20, and a communication network 30.

  The server device 10 is a server computer that can communicate with the portable terminal 20 via the communication network 30, and includes a storage unit 11, a continuous position correction unit 12, and a single position correction unit 13. The storage unit 11 stores position information and accuracy information received from the mobile terminal 20 and corresponding time information, and is realized by a storage device such as a hard disk. The continuous position correction unit 12 corrects the position information received from the mobile terminal 20 using the position information before and after in time. The single position correction means 13 changes the position of the received position information using the position information corrected in the past. The server device 10 is realized by incorporating a dedicated program into a general-purpose computer having a communication function.

  The mobile terminal 20 is a portable terminal device that has a position detection function and can communicate with the server device 10 via the communication network 30, and is a mobile phone having a GPS (Global Positioning System) function and a data communication function. Realized by incorporating a dedicated program. Since a recent mobile phone is equipped with a CPU and can execute a program stored in a memory, if a dedicated program for transmitting position information to the server device 10 is installed in a predetermined manner, the present embodiment Mobile terminal 20 can be realized. The dedicated program can be obtained, for example, by accessing a server operated by a mobile phone company and downloading it. The communication network 30 is for transmitting and receiving data, and is configured by various computers such as base stations, gateways, servers, and communication devices.

(2. Processing operation)
Next, the processing operation of the position information correction system of this embodiment will be described. First, the user sets the position information transmission mode in the portable terminal 20 to the sequential transmission mode. Then, the portable terminal 20 starts a process of transmitting the position information detected by the GPS module to the server device 10 together with the accuracy information and information indicating the transmission mode (here, the sequential transmission mode). This process is periodically performed while the sequential transmission mode is set. The transmission interval can be set as appropriate, but is 5 seconds in this embodiment.

  As described above, when the sequential transmission mode is set, the mobile terminal 20 periodically transmits the position information detected by the GPS module to the server device 10. In the server device 10, the received position information is sequentially processed and stored in the storage unit 11. Specifically, when receiving the position information and the accuracy information from the mobile terminal 20, the server device 10 associates them with each other and stores them in the storage unit 11 together with the time information. The time information is acquired from the internal clock of the server device 10 when the position information is received. Further, it may be received from the portable terminal 20 together with the position information and accuracy information and recorded as it is.

  FIG. 2A is a diagram illustrating an example of information stored in the storage unit 11. As shown in FIG. 2A, the storage device 11 stores the position information, accuracy information, and time information in association with each other by the processing of the server device 10. When the position information is acquired by the GPS function, it is acquired by latitude and longitude, but in the example of FIG. 2, for convenience of explanation, it is shown by simplified two-dimensional coordinates. The accuracy information is output by the GPS function. In this embodiment, the accuracy information is defined at three levels L1 to L3, with L3 having the highest accuracy and L1 having the lowest accuracy. A technique for outputting the measurement level together with the position information by the GPS function has already been used in a GPS module that realizes the GPS function of a commercially available mobile phone, and is well known, and thus detailed description thereof is omitted. The time information may include a date, but in the example of FIG. 2, the time information is expressed by only hours: minutes: seconds not including the date.

  As described above, the server device 10 sequentially performs the process of storing the position information and accuracy information received from the mobile terminal 20 in the storage unit 11 together with the time information. When the position information with accuracy information L3 appears, the continuous position correction means 12 corrects the position information with accuracy information L1 and L2 between them and the position information with time accuracy information L3 before and after. To do. In the example of FIG. 2, since the position information on the 2nd to 4th lines has the accuracy information L1 and L2, the accuracy information on the 1st and 5th lines is corrected using the position information on L3.

  Specifically, the continuous position correcting means 12 has the accuracy information sandwiched between the L3 position information, the accuracy information L1 and L2, and the accuracy information L3 position information equally divided according to the time information. to correct. For example, in the case of the example in FIG. 2, the latitude and longitude of each correction point when the latitude and longitude of the position information on the first line and the fifth line are divided into four equal parts, respectively, Correct as a value. Therefore, in the example of FIG. 2, the latitude / longitude of the position information on the first line is (100, 100), and the latitude / longitude of the position information on the fifth line is (140, 140). The latitude and longitude are corrected to (110, 110), (120, 120), and (130, 130), respectively, as shown in FIG.

  In the present embodiment, the position information whose accuracy information is L3 has high accuracy, and thus is not corrected and is determined as accurate position information at that time as it is. Accordingly, only the position information of the accuracy information L1 and L2 having low accuracy is corrected. Here, a conceptual diagram of the correction by the continuous position correcting means 12 is shown in FIG. In the example of FIG. 3, the position information where ● is measured is high (L3 in this embodiment), and the position information where ▼ is low is low (L1 and L2 in this embodiment). The solid line connects the measured values. In this case, position information with low accuracy is corrected on a broken line connecting position information with high accuracy. □ indicates the position after correction. That is, the measured values are connected by a solid line, but the system corrects the position information on the assumption that the measured value is actually on the broken line.

  Next, the case of the single transmission mode will be described. In the case of the single transmission mode, the correction content of the past position information is used as the correction history information. The correction history information is obtained by extracting the corrected position information after the position information is corrected by the continuous position correction unit 12 and storing it in the storage unit 11. For example, the correction of position information as shown in FIG. 2 is stored in the storage means 11 as correction history information as shown in FIG.

  When the user sets the position information transmission mode in the portable terminal 20 to the single transmission mode and issues a transmission instruction in a state where the correction history information is accumulated in the storage unit 11, the portable terminal 20 is detected by the GPS module. The position information is transmitted only once to the server device 10 together with the accuracy information and information indicating the single transmission mode. The server device 10 stores the received position information in the storage unit 11. Specifically, when receiving the position information and the accuracy information from the portable terminal 20, the server device 10 associates them with each other and stores them in the storage unit 11 together with the time information, as in the case of the sequential transmission mode.

  Further, in the server device 10, when the information indicating the received mode is the single transmission mode, the single position correcting unit 13 determines whether the received accuracy information is high or low. When the accuracy information is low as a result of the determination (in the case of L1 or L2), the single position correction means 13 changes the received position information using the past correction history information.

  Specifically, when the accuracy information of the received position information is low, the single position correction unit 13 first searches the previous correction history information for the position information before correction that is within a predetermined distance from the position information. Then, when pre-correction position information within a predetermined distance is detected, the position information with low accuracy of the correction target is changed to the position of the post-correction position information corresponding to the pre-correction position information.

  For example, it is assumed that the position information received in the single transmission mode is as shown in FIG. In this case, since the accuracy information is L2 and the accuracy is low, the pre-correction position information within a predetermined distance from the position information (203, 202) is searched from the correction history information shown in FIG. For example, when “5.0” is set as the predetermined distance, the pre-correction position information (200, 200) corresponds and is extracted. Then, the value of the post-correction position information (120, 120) corresponding to the pre-correction position information (200, 200) is set as the post-correction value of the position information to be corrected. As a result, as shown in FIG. 4C, the position information (203, 202) is corrected to the position information (120, 120).

  Here, a conceptual diagram of the correction by the single position correction means 13 is shown in FIG. In the example of FIG. 5, ● ▼ □ is the same as that shown in FIG. 3 and indicates the position measured in the sequential transmission mode and the corrected position, and ▼ □ is recorded as past correction history information. It is what has been. ▲ indicates a position measured in the single transmission mode. When the position in the single transmission mode is within a predetermined distance from the position before correction of the correction history information, the position received in the single transmission mode is changed to the corrected position □. When the position information is transmitted in the single transmission mode, there is no information before and after, so that the pedestrian's movement cannot be estimated and corrected as in the sequential transmission mode. On the other hand, the strength of radio waves varies greatly depending on the location, but tends to be measured with the same error at the same location. Therefore, when position information is received alone, the accuracy is low in the past, and the position information is changed to the same position as the corrected position.

(3. Application examples)
An application example of the present invention will be described. The position information correction system according to the present invention can be used for various applications where it is necessary to acquire accurate position information of a mobile terminal, and in particular, a pedestrian who enters a building where radio waves from a satellite are weak. This is effective when correcting the position of. As an example of correcting the position of a pedestrian carrying a portable terminal, an example in which the present invention is applied to a real space information clipping system will be described below.

  FIG. 6 is a block diagram illustrating an embodiment of a real space information clipping system. Real space information clipping system is a system that acquires information about a predetermined place in the real world as post data, transmits it to the server and stores it, and allows the person who accesses the server to freely acquire the post data It is for sharing events found in daily life with many people.

  The server device 40 is a server computer that can communicate with the portable terminal 50 via the communication network 30, and includes a storage unit 41, a continuous position correction unit 42, a single position correction unit 43, and a posted data processing unit 44. . The storage unit 41 stores position information and accuracy information received from the mobile terminal 50, and corresponding time information, and also stores post data received from the mobile terminal 50, and is realized by a storage device such as a hard disk. . The continuous position correcting means 42 and the single position correcting means 43 have the same functions as the continuous position correcting means 12 and the single position correcting means 13 shown in FIG. The posted data processing unit 44 registers the posted data received from the portable terminal 50 in the storage unit 41 in association with the position information, and transmits the posted data when requested by the portable terminal 50. The server device 40 is realized by incorporating a dedicated program into a general-purpose computer having a communication function.

  The portable terminal 50 is a portable terminal device that has a position information detection function and can communicate with the server device 40 via the communication network 30. A dedicated program is applied to a portable phone having a GPS function and a data communication function. Realized by incorporating. The difference from the portable terminal 20 shown in FIG. 1 is that a program for transmitting post data is further incorporated.

  In the real space information clipping system, as in the position information correction system shown in FIG. 1, first, the user sets the transmission mode of the position information in the portable terminal 50 to the sequential transmission mode. Then, the portable terminal 50 starts processing for transmitting the position information detected by the GPS module to the server device 40 together with the accuracy information. And the server apparatus 40 memorize | stores the positional information and precision information received from the portable terminal 50 in the memory | storage means 11 with time information similarly to a positional information correction system. The sequential transmission mode in the real space information clipping system is used for correcting in advance a position that is likely to be erroneously measured so that the position can be corrected when posting the posted data. Therefore, the operator of the real space information clipping system performs an operation of moving around a predetermined area by setting the mobile terminal 50 to the sequential transmission mode.

  The sequential transmission mode is exactly the same in the real space information clipping system and the position information correction system, but is different in the single transmission mode. In the real space information clipping system, when a general user starts a post data transmission program on the portable terminal 50, the portable terminal 50 is set to the single transmission mode. Then, when the user gives an instruction to transmit post data created by photographing or comment input, the mobile terminal 50 displays the position information detected by the GPS module together with its accuracy information and information indicating that it is in the single transmission mode. It is transmitted to the server device 40 only once. In the server device 40, the received position information is stored in the storage means 41 as in the case of the position information correction system. Further, the server device 40 stores the posted data received by the posted data processing unit 41 in the storage unit 41 in association with the position information. Thereafter, the single position correcting means 43 corrects the received position information as in the case of the position information correcting system. As a result, the posted data is registered together with the correct position information.

  The post data stored in the storage means 41 in association with the position information can be browsed from other portable terminals or personal computers via the communication network 30. Specifically, when the server device 40 is accessed from a mobile terminal or a personal computer and a map in a predetermined range is displayed, the server device 40 receives post data having latitude / longitude included in the displayed map as position information. Extracted from the storage means 41 and displayed at a corresponding position on the map. Since the position of the posting data is corrected to an accurate position, the viewer can see the posting data displayed at the accurate position on the map.

  INDUSTRIAL APPLICABILITY The present invention can correct measured position information to an accurate position when a pedestrian moves with a portable terminal, and can be used in various industries that require an accurate position of the portable terminal. it can.

DESCRIPTION OF SYMBOLS 10, 40 ... Server apparatus 11, 41 ... Memory | storage means 12, 42 ... Continuous position correction means 13, 43 ... Single position correction means 20, 50 ... Mobile terminal 30 ... Communication network 44 ... Posted data processing means 100 ... Position information correction system 200 ... Real space information clipping system

Claims (5)

A mobile terminal equipped with a position detection function and a server device are connected via a network,
The server device
Storage means for storing location information and accuracy information received from the mobile terminal in association with time information;
Among the position information stored in the storage means, when there is the corresponding accuracy information that does not satisfy the predetermined accuracy, the accuracy information is earlier and later than the position information, respectively. Continuous position correcting means for extracting the preceding position information and the succeeding position information satisfying a predetermined accuracy, and correcting the position information based on the preceding position information, the succeeding position information and the corresponding time information;
A position information correction system comprising: The storage means stores post-correction position information, which is position information after correction corrected by the continuous position correction means, and position information before correction, which is position information before correction, in association with each other.
The server device determines whether the position information received from the mobile terminal is within a predetermined distance from the position information before correction stored in the storage unit, and the position information before correction within the predetermined distance is 2. The position information according to claim 1, further comprising a single position correction unit that corrects the received position information to the same position as the corrected position information corresponding to the pre-correction position information, if present. Correction system. A server device connected via a network to a mobile terminal having a position detection function,
Storage means for storing location information and accuracy information received from the mobile terminal in association with time information;
Among the position information stored in the storage means, when there is the corresponding accuracy information that does not satisfy the predetermined accuracy, the accuracy information is earlier and later than the position information, respectively. Continuous position correcting means for extracting the preceding position information and the succeeding position information satisfying a predetermined accuracy, and correcting the position information based on the preceding position information, the succeeding position information and the corresponding time information;
The server apparatus characterized by having. The storage means stores post-correction position information, which is position information after correction corrected by the continuous position correction means, and position information before correction, which is position information before correction, in association with each other.
When the position information received from the mobile terminal is within a predetermined distance with the position information before correction stored in the storage means, and when there is position information before correction within the predetermined distance, The server apparatus according to claim 3, further comprising a single position correcting unit that corrects the received position information to the same position as the corrected position information corresponding to the pre-correction position information.   The program for functioning a computer as a server apparatus of Claim 3 or Claim 4.

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