JP2010096633A - Device, method, and program for determining traveling-together - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform determination of traveling-together highly accurately always, independently of measurement accuracy by a position measuring means. <P>SOLUTION: When the determination of traveling-together of two persons is performed, a measured distance d and a resultant error distance R are calculated based on coordinates of the positions of the two persons and a DOP value by a program 136 for extracting traveling-together data, and based on the calculated measured distance d and resultant error distance R, the degree F of traveling-together is calculated by a program 134 for calculating a degree of traveling-together. It is determined, by a program 137 for determining traveling-together, whether or not the two persons travel together by comparing the calculated degree F of traveling-together with two threshold levels set separately, and moreover comparing the resultant error distance R with its threshold level. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a companion determination device, a method and a program for determining whether or not the two parties are accompanied based on, for example, the position information history of the two parties obtained by using GPS (Global Positioning System). .

  In recent years, an increasing number of portable terminals or in-vehicle terminals have a function of measuring their own position by using position measurement means such as GPS and managing a movement history. Recently, an attempt has been made to determine whether or not the two are accompanied by using the movement history of the position, and to use the determination result for providing a service to the user. Whether or not the two are accompanied is determined by, for example, obtaining the distance between the two based on the positional information of the two at the same time and comparing the distance with a preset threshold value. (For example, see Patent Document 1).

JP 2004-118290 A

  However, the conventional determination method has the following problems. That is, in general, in position measurement using GPS, an error of several meters to several tens of meters occurs in a place where the sky is not clearly visible. Therefore, if the measured position coordinates are used as they are to calculate the distance between the two, the measurement error of the position is included in the calculated distance, and the accuracy of determining whether or not the person is accompanied is reduced. Even if the coordinate value is processed using filtering or correction, the error is not completely eliminated. For this reason, when determining whether to accompany with a fixed threshold that the distance between the two is within a certain range, position coordinates where a place with good measurement accuracy and a bad place are mixed It is not possible to make a highly accurate determination from the data. If the threshold is low, the judgment is incorrect if you are together in a place with poor measurement accuracy. Further, since the error changes depending on whether the measurement accuracy is good or bad, it is difficult to make a determination that the distance is more than a certain distance.

  The present invention has been made paying attention to the above circumstances, and the object of the present invention is an accompaniment determination apparatus and method for always permitting accompaniment determination with high accuracy irrespective of whether the measurement accuracy by the position measuring means is good or bad, and To provide a program.

  In order to achieve the above object, according to one aspect of the present invention, the first and second moving bodies accompany the first and second moving bodies based on the position information histories of the first and second moving bodies obtained by the position measuring means. And calculating the distance between the first and second moving bodies based on their respective position information histories, and having the measurement accuracy of the position measuring means. In addition, the error distance included in each position information history is calculated, and the total value of the calculated error distances is calculated as a combined error distance. Then, based on the calculated distance between the first and second moving bodies and the calculated combined error distance, the accompanying degree of the first and second moving bodies is calculated, and this calculation is performed. It is determined whether or not the first and second moving bodies are accompanied by comparing the degree of accompaniment and the synthetic error distance with a threshold value of the degree of accompaniment and the synthetic error distance set in advance. It is composed.

Therefore, according to one aspect of the present invention, not only the distance between the two but also the combined error distance between the two based on the measurement error of the position measurement means is considered, and the degree of companion of the two is determined. Based on this degree of accompaniment and the composite error distance, it is determined whether or not the two are accompanying. For this reason, it is possible to accurately determine whether or not the two are accompanied by comparison with a case where the measured position coordinates are used as they are to calculate the distance between the two and perform the accompanying determination.
That is, according to the present invention, it is possible to provide an accompaniment determination apparatus and method and program that can always perform accompaniment determination with high accuracy regardless of whether the measurement accuracy of the position measurement means is good or bad.

[principle]
A method is used in which the accompanying criteria change depending on whether the GPS measurement accuracy is good or bad. At this time, a DOP (Dilution Of Precision) value is used as a measure of measurement accuracy. The DOP value is a value calculated based on the number and location of captured GPS satellites and the signal strength. The smaller the DOP value, the higher the measurement accuracy. Since it is generally said that the error is 5 m with respect to the DOP value 1, a value obtained by multiplying the DOP value by 5 is defined as an error distance r.
r = 5 x DOP value (1)
By defining equation (1), the error range from the measured position coordinates can be expressed as shown in FIG. Therefore, if the error ranges of the measured position coordinates of the person U1 and the person U2 overlap as shown in FIG. 2, it can be said that the person U1 and the person U2 are highly likely to accompany.

The radius of the circle that draws the error range shown in FIG. 1 is defined as the error distance r, and the accuracy representing whether or not the error distance r and the measured position coordinates of the two are accompanied is calculated. In the present invention, this accuracy is referred to as accompaniment. When the distance between the measured position coordinates of the person A and the measured position coordinates of the person B is d, the error distance of the person U1 is r1, and the error distance of the person U2 is r2, the degree of accompaniment F is as follows: Define.
F = 1− (d / (d + r1 + r2)) (2)
When r1 + r2 is set as the synthesis error distance R, the equation (2) can be modified as follows.
R = (F / (1-F)) d (3)

  The expression (3) can be regarded as an expression representing a straight line having an inclination F / (1-F) on a two-dimensional plane with the combined error distance R as the vertical axis and the measurement distance d as the horizontal axis. That is, the degree of accompaniment F indicates the slope of a straight line on a two-dimensional plane with the combined error distance R and the measurement distance d as axes. FIG. 3 shows the relationship between the degree of accompaniment F, the measurement distance d, and the combined error distance R. Therefore, the accompaniment degree F can be used as a delimiter for the relationship between the measurement distance d between the two parties and the combined error distance R. Therefore, the accompanying degree F can be used as a threshold value for accompanying determination in consideration of the measurement distance d and the combined error distance R.

  By expressing the degree of accompaniment with equation (2), it is possible to make a judgment based on the error as well as whether the distance between the two is simply close. Therefore, by using this degree of accompaniment F, it is possible to make a determination in consideration of a measurement error of position coordinates by GPS, and it is possible to perform an accompanying determination with higher accuracy.

[Embodiment]
In this embodiment, the mobile terminal possessed by the person U1 and the mobile terminal possessed by the person U2 respectively receive GPS signals transmitted from a plurality of GPS (Global Positioning System) satellites, measure the position of the terminal, The measured position information is communicated between the terminals and the accompanying determination is performed. In the accompanying determination, the determination process considering the measurement distance d between the two parties and the combined error distance R is performed. .

  FIG. 4 is a schematic configuration diagram of a portable terminal including the accompanying determination device according to the embodiment of the present invention. As shown in the figure, each of the mobile terminals 10 and 20 includes receiving devices 11 and 21, computing devices 12 and 22, recording devices 13 and 23, data conversion devices 14 and 24, and communication devices 15 and 25. Accompanying determination devices 16 and 26 and display devices 17 and 27 are provided.

  Receiving devices 11 and 21 receive GPS signals transmitted from a plurality of GPS satellites SAT (only one is shown in the figure for simplicity). The calculation devices 12 and 22 calculate time, latitude, longitude, and DOP values based on the GPS signals received by the reception devices 11 and 21, and the calculated values are recorded as raw GPS data. , 23. The data conversion devices 14 and 24 read the raw GPS data calculated by the calculation devices 12 and 22 from the recording devices 13 and 23, and convert the data into data collected for each date and time. The communication devices 15 and 25 communicate with the other person's portable terminals 20 and 10 to be accompanied by determination, and receive the converted GPS data from the other portable terminals 20 and 10. The accompanying determination devices 16 and 26 perform processing for accompanying determination based on the converted GPS data received from the portable terminals 20 and 10 of the other person and the converted GPS data calculated by the own terminal. Execute. The display devices 17 and 27 display information representing the accompanying determination result obtained by the accompanying determination devices 16 and 26.

  FIG. 5 is a block diagram showing the hardware and software configurations of the portable terminals 10 and 20. The mobile terminals 10 and 20 include a central processing unit (CPU) 110 formed of a microprocessor, a program memory 130 and a data memory 140 are connected to the CPU 110 via a bus 120, and a GPS receiver 150, The communication interface 160 and the input / output interface 170 are connected.

  The CPU 110, the program memory 130, the data memory 140, the communication interface 160, and the input / output interface 170 can be shared with existing components of the mobile terminal, and the mobile terminal originally has a GPS receiver. In some cases, this GPS receiver can be shared as a position measuring means.

The GPS receiver 150 corresponds to the receiving devices 11 and 21 shown in FIG. 4 and receives GPS signals transmitted from a plurality of GPS satellites SAT via the antenna 151, respectively.
The communication interface 160 corresponds to the communication devices 15 and 25 shown in FIG. 4, and under the control of the CPU 110, for example, according to a communication protocol defined by a mobile phone network, a wireless LAN, or WiFi, Wireless communication is performed via the antenna 161, and the converted GPS data is received from another person's portable terminal.

  An input device 180 and a display device 190 are connected to the input / output interface 170. For example, the input device 180 includes a keyboard for a personal computer or a PDA (Personal Digital Assistant), and a dial keypad and a plurality of function keys for a mobile phone. In addition, a touch panel or the like can be used. The display device 190 corresponds to the display devices 17 and 27 shown in FIG. 4 and includes a liquid crystal or an organic EL display. The input / output interface 170 transmits operation information from the input device 180 to the CPU 110 and causes the display device 190 to display display information in accordance with a display instruction from the CPU 110. As the input device 180 and the display device 190, those already provided in the mobile terminals 10 and 20 are used as they are.

  The program memory 130 includes an input / output control program 131, a position measurement control program 132, a distance calculation program 133, an accompanying degree calculation program 134, and converted GPS data as application programs necessary for carrying out the present invention. The derivation program 135, the accompanying data derivation program 136, and the accompanying determination program 137 are stored.

  When a position measurement instruction operation is performed on the input device 180, the input / output control program 131 fetches the instruction information via the input / output interface 170 and supplies information indicating the accompanying determination result to the input / output interface 170. Then, the CPU 110 executes processing to be displayed on the display device 190.

The position measurement control program 132 calculates time, latitude, longitude, and DOP value based on each GPS signal received by the GPS receiver 150, and stores the calculated values in the data memory 140 as raw GPS data. CPU110 is made to perform the process to make.
The conversion GPS data deriving program 135 reads the raw GPS data calculated by the position measurement control program 132 from the data memory 140 and converts it into data collected for each date and time.

The accompanying data deriving program 136 performs wireless communication using the communication interface 160 with another person's portable terminal that is the object of the accompanying determination, and receives the converted GPS data from the other portable terminal. The process is executed by the CPU 110.
The distance calculation program 133 is based on the converted GPS data received from the other portable terminal by the accompanying data derivation program 136 and the converted GPS data of the own terminal. And the combined error distance R, which is the sum of the error distance r1 of the other party's terminal and the error distance r2 of the own terminal, based on the DOP value included in the GPS data after conversion, The CPU 110 is caused to execute the calculation process.

The accompaniment degree calculation program 134 calculates the accompaniment degree F between the two parties based on the measurement distance d and the combined error distance R between the other person's terminal and the own terminal calculated by the distance calculation program 133. CPU110 is made to perform the process to perform.
The accompanying determination program 137 uses the accompanying degree F calculated by the accompanying degree calculation program 134 and the combined error distance R calculated by the distance calculating program 133 as a preset threshold of the accompanying degree and combined error distance. The CPU 110 is caused to execute a process of comparing and determining whether or not the two are accompanied.

  The data memory 140 has a position information recording area 141, a distance information recording area 142, a raw GPS data recording area 143, and converted GPS data as recording areas for storing information necessary for carrying out the present invention. A recording area 144, an accompanying data recording area 145, and an accompanying determination recording area 146 are provided.

  In the position information recording area 141, received data of each GPS signal received by the GPS receiver 150 is stored. In the raw GPS data recording area 143, the raw GPS data of the own terminal calculated by the position measurement control program 132 is stored. In the distance information recording area 142, the measured distance d between the two calculated by the distance calculation program 133 is stored. The converted GPS data recording area 144 stores the converted raw GPS data calculated by the converted GPS data deriving program 135. In the accompanying data recording area 145, data necessary for the accompanying determination calculated by the accompanying data derivation program 136 is stored. In the accompanying determination recording area 146, information indicating the accompanying determination result determined by the accompanying determination program 137 is stored.

Next, the operation | movement regarding the accompanying determination process by the portable terminals 10 and 20 comprised as mentioned above is demonstrated.
In the portable terminals 10 and 20, GPS signals from a plurality of GPS satellites SAT are periodically received by the GPS receiver 150 under the control of the position measurement control program 132, and calculation is performed based on the received GPS signals. The devices 12, 22 calculate the time, latitude, longitude, and DOP value, and the calculated values are stored as raw GPS data in the position information recording area 142 of the data memory 140. FIG. 12 shows an example of the stored raw GPS data.

Further, using the measured GPS data, the mobile terminals 10 and 20 perform a series of processes necessary for accompanying determination as follows. FIG. 6 is a flowchart showing the processing procedure of the entire terminal.
That is, first, the data converters 14 and 24 are operated, and raw GPS data is read from the position information recording area 141 in the data memory 140 (step S61), and the raw GPS data is converted into data necessary for accompanying determination. Is performed (step S62). FIG. 7 is a flowchart showing a processing procedure and processing contents by the data converters 14 and 24. Since the processing operations of the data conversion devices 14 and 24 are the same, only the processing operation of the data conversion device 14 will be described here.

  That is, under the control of the converted GPS data deriving program 135, the CPU 110 first reads the raw GPS data A from the position information recording area 141 in step S71. The raw GPS data A includes measurement data obtained at a predetermined sampling period, for example, every second. In step S72, the CPU 110 determines whether or not the read raw GPS data A includes unconverted measurement data. As a result, if unconverted measurement data is not included, the process proceeds to step S77.

  On the other hand, if unconverted measurement data is included, the CPU 110 moves to step S73 and extracts the measurement data a having the earliest (oldest) measurement timing. Then, in step S74, it is checked whether or not necessary data such as latitude, longitude, DOP value, and the like are prepared in the extracted measurement data a. . On the other hand, if the necessary data is available, after deleting the data not necessary for the accompanying determination in step S75, the measurement data a is processed and added to the converted GPS data A 'in step S76, The process returns to step S72. And the process by said step S72-step S76 is repeatedly performed until there is no unconverted measurement data.

  When the processing of steps S72 to S76 is completed, CPU 110 sorts the converted GPS data A ′ in order of date and time in step S77. The converted GPS data A ′ rearranged by this sorting is stored in the converted GPS data recording area 144 in the data memory 140. FIG. 13 shows an example of converted GPS data A ′ stored in the converted GPS data recording area 144.

  Next, the converted GPS data A ′ is transmitted and received between the mobile terminals 10 and 20 by the communication devices 15 and 25 (step S63). The transmission / reception process of the GPS data A ′ after conversion between the terminals 10 and 20 is roughly divided into two processes, a transmission preceding process and a reception preceding process. FIG. 8 is a flowchart showing the procedure and contents of transmission / reception processing by the communication devices 15 and 25.

  That is, the communication devices 15 and 25 are always set in a reception standby state and can receive the converted GPS data A ′ from the counterpart terminal. In this state, it is assumed that the user operates the input device 180 in the terminal U1 to input a companion determination instruction or the transmission timing set in advance is reached. Then, the communication device 15 performs transmission advance processing in step S81, and transmits the converted GPS data A ′ to the designated counterpart terminal 20. On the other hand, the communication device 25 of the counterpart terminal 20 performs reception advance processing in step S82, receives the converted GPS data A ′ transmitted from the terminal 10, and receives the converted GPS data B ′ of the own terminal 20. Is transmitted to the terminal 10.

The reception preceding process is performed as follows. FIG. 9 is a flowchart showing the processing procedure and processing contents.
That is, CPU 110 monitors the arrival of data from another terminal in step S92, and when converted GPS data is received by communication interface 160, is the terminal that has been registered in advance the terminal of the transmission source? It is determined whether or not in step S93. As a result, if the transmission source terminal is a registered terminal, the sent converted GPS data is received and stored in the data memory 140 in step S95. In step S96, the converted GPS data of the own terminal is read from the converted GPS data recording area in the data memory 140, and transmitted from the communication interface 160 to the terminal of the transmission source.

  On the other hand, if the transmission source terminal is an unregistered terminal, the CPU 110 proceeds to step S94 to inquire the user whether or not the received converted GPS data may be received. A message is generated and displayed on the display device 190 via the input / output interface 170. In this state, when the user performs an operation of permitting reception on the input device 180, the reception and transmission processing of the converted GPS data in steps S95 and S96 is performed. If the user performs an operation of refusing reception, a response message to that effect is returned to the transmission source terminal, and the process returns to the reception standby process in step S91.

On the other hand, the transmission advance processing is performed as follows. FIG. 10 is a flowchart showing the processing procedure and processing contents.
That is, the CPU 110 first reads out the converted GPS data of its own terminal from the converted GPS data recording area in the data memory 140 in step S101, and transmits it from the communication interface 160 to the destination terminal specified in advance. Then, after this transmission, a response from the transmission partner terminal is awaited in step S102. In this state, when the response message notifying reception is not received from the transmission partner terminal and the converted GPS data is sent, the converted GPS data is received in step S103 and stored in the data memory 140. The process proceeds to the accompanying determination process. On the other hand, when the reception refusal message arrives, the process ends without moving to the accompanying determination process.

  Next, in the portable terminals 10 and 20, the accompanying determination devices 16 and 26 are activated, and processing is performed to determine whether or not the partner terminal that has received the converted GPS data and the own terminal are accompanying. The accompanying determination processing by the accompanying determination devices 16 and 26 is divided into a preprocessing unit S110, a processing unit S120 that calculates the degree of accompanyingness, and a determination process S130. FIG. 11 is a flowchart showing the processing procedure and processing contents.

  First, in the preprocessing unit S110, the CPU 110 reads the converted GPS data A ′ of the own terminal and the converted GPS data B ′ received from the counterpart terminal from the converted GPS data recording area 144 in the data memory 140 in step S111. Then, in step S112, the sampling rates of the read converted GPS data A 'and B' are confirmed, and if either sampling rate is not 1 second, the sampling rate is 1 second. In step S113, interpolation is performed. In step S114, the determination start time is adjusted to the later of the converted GPS data A ′ and B ′, and the data before the determination start time is deleted. In addition, as a method of interpolation to the above, for example, a method of linearly interpolating measurement data of a non-existing number of seconds from measurement data at times before and after it is used.

  Next, in the accompanying degree calculation unit S120, the CPU 110 calculates the accompanying degree as described below under the control of the accompanying degree calculation program 134. That is, first, in step S121, it is determined whether or not measurement data is included in both the converted GPS data A 'and B'. As a result of the determination, if any one of the measurement data is not included, the process proceeds to the determination process in step S130.

  On the other hand, if both of the converted GPS data A ′ and B ′ contain measurement data, in step S122, the converted GPS data A ′ and B ′ have the earliest time, that is, the oldest measurement. Data α and β are extracted, and it is checked in step S123 whether or not the extracted measurement data α and β are at the same time. As a result of this confirmation, if it is the same time, the process proceeds to step S124, and the measurement distance d, the combined error distance R, and the accompaniment degree F between the terminals are calculated from the extracted measurement data α, β, respectively. Each value is added to the accompanying data f1. The accompaniment degree F is calculated by the equation (2) described above. The accompanying data f1 is stored in the accompanying data recording area 145 in the data memory 140. The calculation process of the measurement distance d, the combined error distance R, and the degree of accompaniment F is repeatedly performed in order of oldest time for all measurement data included in the converted GPS data A ′ and B ′.

  In contrast, in step S123, it is assumed that the extracted measurement data α and β are not the same time. In this case, the CPU 110 proceeds to step S125, and if the time of the measurement data α is earlier than the time of the measurement data β and the measurement data exists in the converted GPS data A ′, the CPU 110 proceeds to step S126. Then, the measurement data with the next oldest time is extracted from the converted GPS data A ′, and this data is set to α in step S122, and the processing from step S123 onward is repeated.

On the other hand, if the time of the measurement data α is later than the time of the measurement data β, the CPU 110 proceeds to step S127, the time of the measurement data β is earlier than the time of the measurement data α, and the converted GPS data A It is determined whether or not measurement data exists at '. As a result of the determination, if the time of the measurement data β is earlier than the time of the measurement data α and the measurement data exists in the converted GPS data A ′, the process proceeds to step S128. Then, measurement data with the next oldest time is extracted from the GPS data B ′ after conversion, and this data is set to β in step S122, and the processing after step S123 is repeated. Note that, as a result of the determination in steps S125 and S127, if measurement data does not exist in any of the converted GPS data A ′ and B ′, the process proceeds to the determination unit S130.
FIG. 14 shows an example of the measurement distance d, the combined error distance R, and the accompanying degree F calculated by the accompanying degree calculating unit S120.

Finally, in the determination unit S130, the CPU 110 calculates the degree of accompaniment as follows under the control of the accompaniment determination program 137. That is, in step S131, the accompanying data is read from the accompanying data recording area 145 in the data memory 140 in the order of date / time. Then, the read accompanying data is averaged at a separately defined time interval T, and the averaged accompanying data is determined according to a separately determined determination rule to determine whether the accompanying data is accompanying. Then, the determination result is stored in the accompanying determination recording area 146 in the data memory 140.
As the averaging method, the measurement distance d, the combined error distance R, and the accompaniment degree F whose time are included in the time interval T are added together, and the added result is included in the time interval T. A method of dividing by the number of times is used.

Further, as a determination rule, a standard determined from the relationship between the degree of accompaniment F, the measurement distance d, and the combined error distance R is used. For example, two threshold values of 0.35 and 0.45 are set as the accompaniment threshold value, and 30 m is set as the threshold value of the combined error distance. And
Accompanying if the degree of accompaniment F ≦ 0.35, if accommodating 0.35 <Accompanying degree F <0.45, if the combined error distance R is 30 m or less If F ≧ 0.45, accompany… (3)
It shall be judged.

  FIG. 15 shows the result of performing the accompany determination by applying the determination rule (3) when the time interval T is set to T = 1 minute for the accompany data shown in FIG. "Yes" is displayed for those that have been performed, and "no" is displayed for those determined to be non-accompanying. In the example shown in the figure, the person U1 and the person U2 accompany during the period from 6:30 to 6:36, and perform different actions during the period from 6:37 to 6:55, 6:56 to 6: In 59, it is determined that the person has accompanied again.

  FIG. 16 shows an example in which data is plotted on a two-dimensional plane in which the horizontal axis is the measurement distance d between the two and the vertical axis is the composite error distance R. For the accompanying data (together) It is represented by a black rhombus, and non-accompaniment (alone) is represented by a white square. As is clear from the figure, whether the person is accompanying or not accompanying is greatly influenced not only by the measurement distance between the two persons but also by the composite error distance between the two persons.

FIG. 17 shows the determination result when the range of the measurement distance shown in FIG. 16 is 0 to 150 m and the accompanying determination is performed by applying the determination rule (3) in the present embodiment described above. . In the figure, an area E1 without shading is an area determined as “accompanying”, and a shaded area E2 is an area determined as “non-accompanying”. Further, as in FIG. 16, the accompanying thing (together) is indicated by a black rhombus, and the non-accompanying (alone) is indicated by a white square.
As a result of applying the decision rule (3), the correct answer rate was 95.3%. Incidentally, when the determination was made with the threshold value simply set to 0.4, the accuracy rate was 91.15%, confirming improvement of the determination accuracy.

  As described above, in this embodiment, when the accompanying determination is performed, the measurement distance d and the combined error distance R are calculated based on the position coordinates between the two and the DOP value, and the calculated measurement distance d is calculated. And calculating the accompanying degree F based on the combined error distance R, comparing the calculated accompanying degree F with two separately determined threshold values, and further comparing the combined error distance R with the threshold value. Thus, it is determined whether or not the two are accompanied.

  Therefore, since it is determined whether or not to accompany the measurement error distance R as well as the combined error distance R, compared to the case where the accompaniment determination is performed using only the measurement distance between the two. It is possible to accurately determine whether or not the two are accompanied. That is, it is possible to always carry out accompaniment determination with high accuracy regardless of the accuracy of position measurement using GPS.

  FIGS. 18 and 20 show averaged measurement distances and combined error distances at a time interval T = 1 minute from certain measurement data (Data1, Data2) between the two, and the determination rule ( 3 is a comparison of the accuracy rate of the determination result of the present invention in which the accompany determination is performed by applying 3) and the accuracy rate of the determination result by the conventional method in which the accompaniment determination is performed using only the measurement distance between the two parties. FIGS. 19 and 21 show the correct answer rates shown in FIGS. 18 and 20 in a line graph, respectively.

  The vertical columns in FIG. 18 and FIG. 20 show a method for performing the accompany determination. The conventional method described in FIG. 18 and FIG. 20 indicates a method in which accompaniment determination is performed using a measurement distance as a threshold value, and a numerical value (m) in parentheses is a threshold value of the measurement distance. The horizontal columns in FIG. 18 and FIG. 20 indicate which measurement data is used for the correct answer rate. Overall, accuracy (good / bad) for all measured data is low / high DOP value, and accompanying (good / bad) DOP value is low / high from the time spent accompanying In this case, the correct answer rate is obtained for each data. In this comparison, the threshold value for determining whether the DOP value is low or high is 5. Since it is generally said that the DOP value is 5 or less, it is said that the DOP value is reliable.

  As is apparent from FIGS. 18 and 20, the average value of the correct answer rate is higher and the variance is greater than any of the conventional methods according to the determination method according to the present invention for both measurement data (Data1, Data2). You can see that it is small. That is, by adopting the determination method according to the present invention, a highly accurate determination result can be obtained stably. In particular, a good accuracy rate can be obtained when the GPS measurement accuracy is degraded, and a good accuracy rate can be maintained even when the GPS measurement accuracy is relatively good.

  Incidentally, in the conventional method, the determination result is greatly influenced by the threshold value, and the variation due to the GPS measurement accuracy is also large. For this reason, when measurement data is given when going back and forth between a place where the GPS measurement accuracy is relatively good and a place where the measurement accuracy is not good, the conventional method is greatly affected by that and a stable determination result cannot be obtained. .

  The present invention is not limited to the above embodiment. For example, in the above embodiment, two values of 0.35 and 0.45 are used as the threshold value of the accompaniment degree, but these values may be other values. Further, the threshold value of the composite error distance is not limited to 30 m, and other values may be used.

  Further, in the above embodiment, the case where GPS is used as the position measuring means has been described as an example. However, the present invention is not limited to this. For example, the accompanying determination of the present invention may be performed using position coordinate data provided from a base station of a mobile communication network and data representing the accuracy thereof.

In addition, the type and configuration of the terminal, the procedure and contents of the accompanying determination process, the use of the accompanying determination result, and the like can be implemented with various modifications without departing from the gist of the present invention.
In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

It is used for explaining the principle of the present invention and is a diagram for explaining an error range due to DOP. It is used for explaining the principle of the present invention and is a diagram for explaining the overlap of error ranges between the two. It is used for explanation of the principle of the present invention, and is a diagram for explaining the relationship between the degree of accompaniment between two parties, the measured distance, and the combined error distance. It is a block diagram which shows the structure of the portable terminal provided with the accompanying determination apparatus concerning one Embodiment of this invention. It is a block diagram which shows the structure of the hardware and software of the accompanying determination apparatus concerning one Embodiment of this invention. It is a flowchart for demonstrating the whole process sequence by the portable terminal shown in FIG. It is a flowchart which shows the process sequence and process content by the data converter of the portable terminal shown in FIG. It is a flowchart which shows the communication processing procedure and processing content by the communication apparatus of the portable terminal shown in FIG. It is a flowchart which shows the procedure and content of a reception preceding process among the communication processing procedures shown in FIG. It is a flowchart which shows the procedure and content of the transmission prior | preceding process among the communication processing procedures shown in FIG. It is a flowchart which shows the process sequence and process content by the accompanying determination apparatus shown in FIG. It is a figure which shows an example of the GPS data (raw GPS data) memorize | stored in the recording device of the portable terminal shown in FIG. It is a figure which shows an example of the conversion GPS data obtained by the data conversion process shown in FIG. It is a figure which shows an example of the accompanying data required for the accompanying determination obtained in the accompanying determination process shown in FIG. It is a figure which shows an example of the accompanying determination result by the accompanying determination process shown in FIG. It is a figure which shows the result of having plotted position measurement data on the two-dimensional plane which makes a horizontal axis | shaft measurement distance and makes a vertical axis | shaft a synthetic | combination error distance. It is the figure which showed the determination result by the accompanying determination process shown in FIG. 12 on the two-dimensional plane which makes a horizontal axis a measurement distance and makes a vertical axis | shaft a synthetic | combination error distance. It is the figure which showed an example of the data of the determination correct answer rate by the accompanying determination process shown in FIG. 12 compared with the conventional method. It is the figure which showed the determination correct answer rate shown in FIG. 18 with the line graph. It is the figure which showed the other example of the data of the determination correct answer rate by the accompanying determination process shown in FIG. 12 compared with the conventional method. It is the figure which showed the determination correct answer rate shown in FIG. 20 with the line graph.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10,20 ... Portable terminal, 11, 21 ... Receiving device, 12, 22 ... Calculation device, 13, 23 ... Recording device, 14, 24 ... Data conversion device, 15, 25 ... Communication device, 16, 26 ... Accompanying determination device , 17, 27 ... display device, 110 ... CPU, 120 ... bus, 130 ... program memory, 131 ... input / output control program, 132 ... position measurement control program, 133 ... distance calculation program, 134 ... accompaniment calculation program, 135 ... Conversion GPS data derivation program, 136 ... Accompanying data derivation program, 137 ... Accompanying determination program, 140 ... Data memory, 141 ... Location information recording area, 142 ... Distance information recording area, 143 ... Raw GPS data recording area, 144 ... Conversion GPS Data recording area, 145 ... Accompanying data recording area, 146 ... Accompanying determination recording area , 0.99 ... GPS receiver, 151 ... GPS receiving antenna, 160 ... communication interface, 161 ... antenna for communication interface, 170 ... input-output interface, 180 ... input device, 190 ... display device.

Claims (3)

A companion determination device for determining whether or not the first and second moving bodies are accompanied on the basis of position information histories of the first and second moving bodies obtained by the position measuring means,
Means for calculating the distance between the first and second moving bodies based on their respective position information histories;
Means for calculating an error distance included in each position information history based on the measurement accuracy of the position measurement means, and calculating a total value of the calculated error distances as a combined error distance;
Means for calculating the degree of accompaniment of the first and second moving bodies based on the calculated distance between the first and second moving bodies and the calculated combined error distance;
Means for determining whether or not the first and second moving bodies are accompanied by comparing the calculated degree of accompaniment and the combined error distance with a preset threshold of the degree of accompaniment and the combined error distance. The accompanying determination apparatus characterized by comprising. A accompanying determination method for determining whether or not the first and second moving bodies are accompanied on the basis of position information histories of the first and second moving bodies obtained by the position measuring means,
Calculating the distance between the first and second moving bodies based on their respective position information histories;
Calculating the error distance included in each position information history based on the measurement accuracy of the position measurement means, and calculating the total value of the calculated error distances as a combined error distance;
Calculating the degree of accompaniment of the first and second moving bodies based on the calculated distance between the first and second moving bodies and the calculated combined error distance;
A step of comparing the calculated degree of accompaniment and the combined error distance with a preset threshold of the degree of accompaniment and the combined error distance to determine whether or not the first and second moving bodies are accompanied. The accompaniment determination method characterized by comprising. A program for determining whether or not the first and second moving bodies are accompanied by using a computer based on the position information histories of the first and second moving bodies obtained by the position measuring means. And
A process for calculating the distance between the first and second moving bodies based on their respective position information histories;
A process of calculating an error distance included in each position information history based on the measurement accuracy of the position measurement unit, and calculating a total value of the calculated error distances as a combined error distance;
Processing for calculating the degree of accompaniment of the first and second moving bodies based on the calculated distance between the first and second moving bodies and the calculated combined error distance;
A process of comparing the calculated degree of accompaniment and the combined error distance with a preset threshold of the degree of accompaniment and the combined error distance to determine whether or not the first and second moving bodies are accompanied. Is executed by the computer.

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