JP2011237336A - Terminal, terminal control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a user from having distrust on reliability of presentation information by terminating displaying of an incorrect present position and also presenting correct present position information to the user in a portable terminal 10.SOLUTION: The present position is measured based on a GPS radio wave and stored as position information. A circle W2 is set, where previous position information P1 is defined as a center and a radius is a distance between the previous position information P1 and current position information P2. The circle W2 is displayed in a display part 14 as a current existence area.

Description

  The present invention relates to a terminal that measures and displays a current position, a terminal control method, and a program.

  Some portable terminals carried by users are equipped with a function of measuring and displaying the current position based on GPS (Global Positioning System) radio waves. In such a portable terminal, the positioning error of the current position increases due to the influence of multipath in a high-rise building district, switching of a GPS satellite that is a radio wave transmission source, and the like.

  In Patent Documents 1 and 2, GPS reception is performed to prevent the user from being confused by displaying the current position of the positioning even though the current position of the positioning determined from the GPS radio wave is far from the actual current position. A device and a navigation device are each disclosed.

  According to the GPS receiver of Patent Document 1, the current predicted current position predicted based on the past current positioning position is compared with the current position determined based on the current reception of the GPS radio wave, When the distance to the current position of the positioning is greater than or equal to a predetermined threshold, the intersection of the straight line connecting the predicted current position and the current position of the positioning and the circle of the position error range for the current position of the positioning is displayed as the current position. (Paragraph 0022, paragraph 0022 and FIG. 3).

  According to the navigation device of Patent Document 2, when the current position of the present time is a predetermined distance or more away from the previous current position, a straight line connecting the previous positioning current position and the current positioning current position, The intersection with the circle whose radius is the predetermined distance from the current position of the positioning is displayed as the current position (FIG. 1 of Patent Document 2).

  Patent Document 3 discloses a terminal that displays a positioning error region for a positioning current position on a map together with the current positioning current position measured from GPS radio waves (FIG. 4 of Patent Document 3). Patent Document 3 further discloses a method of calculating a positioning error based on GPS radio waves (for example, 0046 and 0047 of Patent Document 3).

JP 2000-2759 A JP 2000-329578 A JP 2003-215228 A

  In the devices of Patent Documents 1 to 3, a reasonable current position is calculated and displayed as a point. However, there is no guarantee that the current position displayed as a point is the actual current position, and the user is not able to display the current position. The trust from is reduced.

  An object of the present invention is to provide a terminal, a method, and a program for presenting appropriate current position information to prevent user distrust.

  According to the present invention, the current position is measured and the position information related to the current position of the positioning at each time point is stored. Then, the current position existence range is calculated based on the past and current position information and displayed to the user.

The terminal of the present invention
A current position measurement unit for measuring the current position of the aircraft;
A storage medium control unit that stores position information related to the current position of the positioning at each time point in the storage medium so that the position after the positioning time can be distinguished; and
An indexing unit for determining a current position existence range based on past and current position information read from the storage medium;
A display control unit for displaying the current position existence range on a display;
Is provided.

The terminal control method of the present invention includes:
A current position measurement unit for measuring the current position of the aircraft;
A storage medium control unit that stores position information related to the current position of the positioning at each time point in a storage medium so that the position after the positioning time can be distinguished;
An indexing unit for determining a current position existence range based on past and current position information read from the storage medium;
A display control unit for displaying the current position existence range on a display;
Is provided.

  The program of the present invention causes a computer to function as the terminal of the present invention.

  According to the present invention, since there is a high probability that information that may be wrong is not presented to the user, the reliability from the user can be maintained.

It is a block diagram of a portable terminal. It is a figure which shows the storage state of the positional information in the information storage part of a portable terminal. It is a flowchart of a GPS reception processing method. It is explanatory drawing of the system which calculates the present position presence range as a circle of the predetermined radius centering on the last present position. 5 is a flowchart of a current position display processing method for calculating a current position existence range based on the calculation method of FIG. 4. It is explanatory drawing about the modification of the calculation system of FIG. It is explanatory drawing about another modification of the calculation system of FIG. It is explanatory drawing of the system which calculates a present position presence range as a circle | round | yen of the predetermined radius centering on this present position. It is a flowchart of the present position display processing method which employ | adopted the calculation system of FIG. It is explanatory drawing about the modification of the calculation system of FIG.

It is explanatory drawing about another modification of the calculation system of FIG. It is explanatory drawing of the system which calculates a circle | round | yen with this diameter as a present position presence range after calculating a diameter based on position information. It is a flowchart of the present position display processing method which employ | adopted the calculation system of FIG. It is explanatory drawing about the modification of the calculation system of FIG. It is explanatory drawing about another modification of the calculation system of FIG. It is a flowchart of the present position display processing method which calculates error information with a positional information from GPS electromagnetic wave, and stores it in an information storage part. It is explanatory drawing about the storage system of the positional information and error information in an information storage part. It is explanatory drawing of the calculation system about the present position existing range of the shape which contains the error range of the last time and this time at both ends. It is a flowchart of the present position display processing method which employ | adopted the calculation system of FIG. It is explanatory drawing about the modification of the calculation system of FIG. It is a flowchart of the present position display processing method which employ | adopted the calculation system of FIG.

  In FIG. 1, the portable terminal 10 includes a CPU 11, a GPS receiving unit 12, a wireless communication unit 13, a display unit 14, an operation unit 15, an information storage unit 16, and a clock / timer unit 17, and is carried by a user. The mobile terminal 10 is, for example, a mobile phone, a mobile navigation device, or a mobile wireless device. The CPU 11 performs data exchange with each element of the mobile terminal 10 and data calculation processing according to the program being executed, and controls the entire mobile terminal 10.

  The terminal according to the present embodiment is typically a terminal that is carried by a user such as the portable terminal 10, but may be a terminal that is mounted on a car.

  The GPS receiver 12 receives GPS radio waves from a plurality of GPS satellites (not shown) at the GPS antenna 18 and outputs positioning data of the current position calculated based on the GPS radio waves to the CPU 11. The GPS receiving unit 12 may only receive a GPS radio wave and send a reception signal to the CPU 11 without performing a positioning process from the GPS radio wave. In that case, the CPU 11 performs a positioning process for the current position.

  The current position positioning unit used in the present embodiment may measure the current position using a positioning radio wave, or may measure the current position using various sensors or optical beacons. The positioning radio wave is typically a GPS radio wave from a plurality of GPS satellites, but may be a radio wave from a predetermined single or a plurality of ground radio stations.

  The wireless communication unit 13 receives a communication radio wave from a partner device or a base station at the radio communication antenna 19 and outputs voice and data demodulated from the communication radio wave to the CPU 11. The wireless communication unit 13 also transmits an RF signal modulated by voice or data from the CPU 11 from the wireless communication antenna 19.

  The display unit 14 displays various information. The operation unit 15 is operated by a user and outputs operation information to the CPU 11. The information storage unit 16 includes a RAM, a ROM, and a nonvolatile memory, and stores programs and data. The clock / timer unit 17 generates time information and measures elapsed time.

  FIG. 2 shows a storage state of the position information P1 and P2 in the information storage unit 16 of the mobile terminal 10. The GPS receiving unit 12 measures the current position based on GPS radio waves at regular intervals, and the measured current position is stored in the information storage unit 16 as position information. The position information P1 and P2 are typically the previous and current positioning current positions, respectively, and the position information is stored in the information storage unit 16 so as to be distinguishable between the previous and current positions. As will be described later in FIG. 6 and the like, the current position information stored in the information storage unit 16 may be replaced with the current position Q2 corrected from the current positioning current position. As a result, the position information P1 is It may be the previous correction current position instead of the previous positioning current position.

  In FIG. 2, only the previous position information is stored as the past position information. However, in the present embodiment, a plurality of position information is stored as the past position information, and is used for calculation of the present area described later. You can also. For example, if it is determined that the previous positioning current position is abrupt with respect to the previous positioning current position and the current positioning current position, the previous position information may be replaced with the previous position information, It can be replaced with information corresponding to the position of the midpoint between the previous positioning current position and the current positioning current position.

  In the flowchart of the GPS reception processing method 25 in FIG. 3, in S26, it is determined whether or not the GPS receiving unit 12 is turned on. If the determination is positive, the process proceeds to S27. The process of method 25 ends immediately.

  In S27, it is determined whether or not GPS radio waves can be received. If the determination is positive, the process proceeds to S28, and if not, the process of the GPS reception processing method 25 is terminated. Specifically, whether or not GPS radio waves can be received is determined based on, for example, the electric field strength of GPS radio waves. When the mobile terminal 10 exists indoors, in an underground mall or in a valley of a building, the GPS radio wave to the mobile terminal 10 may be interrupted or weakened beyond an allowable value. At this time, positioning of the current position by GPS radio waves becomes impossible.

  In S28, the GPS information included in the GPS radio wave is analyzed to identify the current position. The specified current position corresponds to the positioning current position of the present embodiment. Hereinafter, the “positioning current position” is defined as a current position measured based on positioning radio waves such as GPS radio waves, and is used separately from the corrected current position Q2 in FIG.

  In S29, the position information P2 is overwritten on the position information P1 in the information storage unit 16, and in S30, the current position specified in S28, that is, the positioning current position is overwritten on the position information P2. Thus, as shown in FIG. 2, the position information of the current position of the previous time and the current time is stored in the information storage unit 16 as position information P1 and P2, respectively.

  FIG. 4 is an explanatory diagram of a method for calculating the current position existence range as a circle with a predetermined radius centered on the previous current position. Specifically, the current position existence range is the current existence area W2. With reference to FIG. 4, the calculation method will be described first, and then the current position display processing method 40 of FIG. 5 adopting the calculation method will be described. Note that the position information P1 and P2 are broader than the current position in terms of information about the current position, but in the description of the embodiment in FIG. 4 and the like, they are also used to mean the current position itself. . In addition, “position” in “previous position”, “previous position” and “current position” means “current position”. The current presence area W2 is an area determined based on the past and current position information read from the storage medium. W1 means a range displayed as the current presence area W2 on the display unit 14 at the time of positioning of the previous current position. Although W2 is displayed on the display unit 14, W1 is not displayed.

  In FIG. 4, W2 is set to a circle whose center is P1 and whose radius is the distance R between P1 and P2. W2 is calculated based on the latest GPS radio wave at regular time intervals T and displayed on the display unit 14 of the mobile terminal 10. Once displayed, W2 is then maintained for a time T, ie until the next update of W2.

  The current area W2 on the display unit 14 is more ambiguous than the on-time display of the current position, but the user of the mobile terminal 10 stops as appropriate while walking, and the map of the display unit 14 is displayed. Can be collated with actual surrounding buildings and the like, so if the user is presented with the current existence area W2, the user can look around and accurately identify his / her position, so there is no inconvenience. .

  The specific display mode of the current presence area W2 on the display unit 14 is, for example, displaying only the outline of the current presence area W2 in a predetermined color (eg, black), or the entire area of the current presence area W2. Is displayed in a light-transmitting light color such as translucent. The reason for making the color transparent is to allow the user to properly recognize the map portion covered by the current presence area W2. Further, in order to enhance the visual effect, the density or color of the transmissive color may be changed in accordance with the size of the presence area W2. For example, if a table that associates the radius with the color density is stored and the radius of the existence area W2 is large, the visual effect is enhanced by reducing the density of the transparent color, As the map portion covered by the presence area W2 is larger, the transparent color becomes lighter, so that the user can easily recognize the map portion.

  In FIG. 4 and FIGS. 6 to 8, 9 and 10, which will be described later, a circle having a radius of P1-P2 or a distance of P1-Q2 is the present existence area W2, but a distance of P1-P2 Alternatively, the distance of P1-Q2 may be half the long axis, and an ellipse having the long axis may be the current existence area W2. In this ellipse, when the present existence area W2 is a circle, P1, P2 or Q2 on the circumference of the circle is a position on the circumference of the ellipse, strictly, the position of the end of the major axis of the ellipse It becomes. It should be noted that the area of the current position is narrower than the circle of the current existence area W2 than the circle, and the range of the current position is narrowed accordingly.

  4 and FIG. 6 and FIG. 7, which will be described later, in the present calculation method of the existing area W2, the center of the circle is set to the previous position information P1, whereas the present method in FIG. 8, FIG. 9 and FIG. In the calculation method of the existence area W2, the center of the circle is set to the current position information P2 or the corrected current position Q2. This means that the former position information P1 is emphasized in the former, and the current position information P2 is emphasized in the latter. In general, the area of the circle of the current existence area W2 is larger than that of the former. In the latter case, the area of the current existence area W2 is changed to the above-described ellipse instead of a circle. It is advantageous to reduce.

  FIG. 5 is a flowchart of the current position display processing method 40 employing the calculation method of FIG. Typically, the current position display processing method 40 is executed as soon as the GPS reception processing method 25 in FIG. In S41, it is determined whether or not it is the display timing of the current position on the display unit 14. If the determination is positive, the process proceeds to the next S42, and if not, the process of the current position display processing method 40 is terminated. To do. In S42, it is determined whether or not the position information P1 and P2 are both stored in the information storage unit 16. If the determination is positive, the process proceeds to the next S43. If not, the current position display processing method 40 is changed. finish.

  In S43, the current position display is deleted from the display unit 14. The current position display specifically refers to the current presence area W2 on the display unit 14. The present existence area W2 deleted here means the previous existence area W1 in FIG. In S44, a distance R between the position information P1 and P2 is calculated. In S45, a circle with a radius R centered on the position information P1 is drawn on the map. A circle is the current existence area W2 in FIG. Moreover, the map of the predetermined range containing W2 is displayed on the display part 14 as a map.

  FIG. 6 is an explanatory diagram of a modification of the calculation method of FIG. Only differences from the calculation method of FIG. 4 will be described. In the calculation method of FIG. 6, when P2 is within a predetermined distance from P1, it is determined that P2 is valid, and W2 is calculated by the calculation method of FIG. The predetermined distance is, for example, the radius of the circle in the position error range (UERE) described in Patent Document 1, or the radius of the circle in the error range of FIG.

  On the other hand, when P2 is away from P1 by a distance larger than the predetermined distance, the correction position Q2 is calculated, and W2 is set based on P1 and Q2. Specifically, W2 is a circle whose center is P1 and whose radius is the distance R between P1 and Q2.

  The calculation method of the corrected current position Q2 in FIG. 6 is, for example, as described in FIG. That is, prior to calculating Q2, the current predicted position U2 is calculated. U2 is the arrival position at the calculation time of P2 when the speed and direction at the position P1 are calculated and moved from P1 toward the direction calculated at the calculated speed. The correction position Q2 is an intersection of a straight line connecting P2 and U2 and a circle centered on P2 and having an error range as a radius.

  When the current presence area W2 is displayed based on the correction position Q2, the correction position Q2 is overwritten in the information storage unit 16 as the position information P2 in FIG. The information storage unit 16 overwrites the correction position Q2 as the position information P2 in FIG. 2 as well as the correction position Q2 in FIG. Also in the case of 11 and FIG.

  FIG. 7 is an explanatory diagram of another modification of the calculation method of FIG. Only differences from the calculation method of FIG. 4 will be described. In the calculation method of FIG. 7, when P1 is within a predetermined distance from P2, it is determined that P2 is valid, and W2 is calculated by the calculation method of FIG.

  The predetermined distance is, for example, V · T, where V is the maximum walking speed of the user and T is the update time interval T for displaying W2. The user of the mobile terminal 10 may be riding a bicycle or a car, and the predetermined distance may be a product of the maximum movement speed and T within the latest predetermined time instead of the maximum walking speed V. A circle whose center is P1 and whose radius is a predetermined distance is indicated by a wavy line in FIG. However, since the wavy line coincides with the solid line circle in the current existence area W2 in FIG. 7, it is difficult to see because it is hidden behind the solid line circle. The wavy line circle is clearly shown in FIG.

  On the other hand, when P2 is away from P1 by a distance greater than a predetermined distance, W2 is a circle whose center is P1 and whose radius is the predetermined distance. Further, the intersection of the straight line connecting P1 and P2 and the circumference of W2 is calculated as the correction position Q2, and the correction position Q2 is overwritten in the information storage unit 16 as the position information P2 in FIG.

  FIG. 8 is an explanatory diagram of a method for calculating the current position existence range as a circle with a predetermined radius centered on the current current position. With reference to FIG. 8, the calculation method will be described first, and then the current position display processing method 50 of FIG. 9 adopting the calculation method will be described. The calculation method of FIG. 8 differs from the calculation method of FIG. 4 in that, in the calculation method of FIG. 8, the current existence area W2 is a circle whose center is P2 and whose radius is the distance R between P1 and P2. Is set to

  FIG. 9 is a flowchart of the current position display processing method 50 adopting the calculation method of FIG. Since S51 to S54 are the same as S41 to S44 of the current position display processing method 40 of FIG. In S55, a circle with a radius R centered on the position information P2 is drawn on the map. The circle is W2 in FIG.

  FIG. 10 is an explanatory diagram of a modification of the calculation method of FIG. Only differences from the calculation method of FIG. 8 will be described. In the calculation method of FIG. 10, when P2 is within a predetermined distance from P1, it is determined that P2 is valid, and W2 is calculated by the calculation method of FIG.

  On the other hand, when P2 is away from P1 by a distance greater than a predetermined distance, a correction position Q2 is calculated, and W2 is a circle having a radius between P1 and Q2 and having a center at Q2. The method of determining the predicted position U2 and the correction position Q2 in FIG. 10 is the same as in FIG.

  FIG. 11 is an explanatory diagram of another modification of the calculation method of FIG. Only differences from the calculation method of FIG. 8 will be described. In FIG. 11, the correction position Q2 is determined in the same manner as in FIG. In the calculation method of FIG. 11, when P2 is within a predetermined distance from P1 (within the wavy circle in FIG. 11), it is determined that P2 is valid, and W2 is calculated by the calculation method of FIG. The predetermined distance is the same as the predetermined distance in the case of FIG.

  When P2 is away from P1 by a distance greater than a predetermined distance, a correction position Q2 is calculated, and W2 is a circle having a radius between P1 and Q2 and having a center at Q2.

  FIG. 12 is an explanatory diagram of a method of calculating a diameter based on position information and then calculating a circle having the diameter as the current position existence range. Referring to FIG. 12, the calculation method is described first, and then the current position display processing method 60 of FIG. 13 that employs the calculation method is described. In the calculation method of FIG. 12, W2 is set to a circle having P1 and P2 at both ends of the diameter.

  The present area W2 that is a circle having a diameter of P1-P2 has a larger area than the current area W2 (FIGS. 4 to 11) that is a circle having a radius of P1-P2. As a result, the user can easily narrow down the existing range of the current position.

  FIG. 13 is a flowchart of the current position display processing method 60 adopting the calculation method of FIG. Steps S61 to S64 are the same as S41 to S44 of the current position display processing method 40 in FIG. In S65, a center coordinate P with the position information P1 and P2 as both ends of the diameter is calculated. In S66, a circle with a diameter R centered on the coordinate P is drawn on the map. The circle is W2 in FIG.

  FIG. 14 is an explanatory diagram of a modification of the calculation method of FIG. In FIG. 14, the predicted position U2 and the correction position Q2 are determined in the same manner as in FIG. The present area W2 is a circle having P1 and Q2 at both ends of the diameter.

  FIG. 15 is an explanatory diagram of another modification of the calculation method of FIG. In FIG. 15, the correction position Q2 is determined in the same manner as in FIG. The present area W2 is a circle having P1 and Q2 at both ends of the diameter.

  FIG. 16 is a flowchart of a current position display processing method 70 for calculating error information together with position information from GPS radio waves and storing it in the information storage unit 16. The position information and error information stored by the current position display processing method 70 are used for calculation of the current presence area W2 in FIGS. The execution time interval of the current position display processing method 70 is typically matched with the update time interval of the current existence area W2. Since S71 and S72 are the same as S26 and S27 of the GPS reception processing method 25 in FIG.

  In S73, the received GPS information is analyzed, and the current position, speed, and direction of the mobile terminal 10 are specified. In S74, the circle of the error range of the current position is calculated from the current position, speed and direction specified in S73. The error range circle corresponds to E1 and E2 in FIGS.

  As a specific method for determining the error range, for example, the one disclosed in Patent Document 3 is adopted. As a determination method, (a) in the GPS world, the positioning error is generally expressed as 2 drms (twice the distance root meansquare), and the possibility that a correct position exists within the radius of 2 drms is 95.45. % To 98.16%, so that the value of 2drms is used as the radius of the error circle, and (b) the horizontal axis represents the GPS radio wave reception sensitivity, the DOP (Dilution of Precision) value included in the GPS radio wave, and the standard In addition to the deviation, the number of satellites, and / or the speed of the terminal, graph information with the vertical axis representing the error amount empirically examined for the model of the mobile terminal 10 is stored in the ROM of the information storage unit 16 and detected. There is a method of calculating an error amount based on the received sensitivity, DOP value, etc., and making the error amount a radius of an error circle.

  In S75, the position information P2 and the error information E2 are overwritten on the position information P1 and the error information E1 in the information storage unit 16. A specific method for storing position information and error information in the information storage unit 16 will be described later with reference to FIG. In S76, the current position analyzed in S73 and the error information calculated in S74 are overwritten on the position information P2 and error information E2 of the information storage unit 16, respectively.

  FIG. 17 is an explanatory diagram of a method for storing position information and error information in the information storage unit 16. Only differences from FIG. 2 will be described. In FIG. 2, only the position information P1 and P2 are stored in the information storage unit 16 so that they can be distinguished from each other, whereas in FIG. 17, the error information E1 and E2 are also associated with the position information P1 and P2, respectively. Stored. The position information P1 and the error information E1 are overwritten in S75, and the position information P2 and the error information E2 are overwritten in S76.

  FIG. 18 is an explanatory diagram of a calculation method for the current position existence range of a shape including the previous and current error ranges at both ends. The previous position information P1 and error information E1, and the current position information P2 and error information E2 are the same as those shown in FIG.

  A circle A whose center is the previous position information P1 and whose diameter is the distance between both ends of the error range extracted from the error information E1, and an error range whose center is the current position information P2 and whose diameter is extracted from the error information E2. A circle B that is the distance between both ends is set. Next, the common tangents C and D are set for the circles A and B. Next, the contacts a1 and a2 with the tangent lines C and D in the circle A are set. Further, the contact points b1 and b2 with the tangent lines C and D in the circle B are set.

  The present area W2 includes a line segment a1-b1, a line segment a2-b2, a circumferential portion of the circle A that bulges outward from the points a1 and a2 and connects them, and bulges outward from the points b1 and b2. It is set to a region surrounded by the circumferential portion of the circle B on the side where it is put out and connected.

  FIG. 19 is a flowchart of the current position display processing method 100 employing the calculation method of FIG. S101 and S102 are the same as S41 and S42 of the current position display processing method 40 (FIG. 5), and a description thereof will be omitted.

  In S103, it is determined whether or not the error information E1 with respect to the position information P1 is stored in the information storage unit 16. If the determination is positive, the process proceeds to S104, and if not, the process proceeds to S105. In S104, the circle A of the error range of the error information E1 is set. In S105, a circle A having a predetermined radius is set. The center of the circle A is the position information P1. In S104 and S108, which will be described later, the circles A and B are set even if there is no error information E1 and E2, so as to ensure the presentation of W2 to the user as long as there is at least position information P1 and P2.

  In S106, it is determined whether or not error information E2 with respect to the position information P2 is stored in the information storage unit 16. If the determination is positive, the process proceeds to S107, and if not, the process proceeds to S108. In S107, an error range circle B of the error information E2 is set. In S108, a circle B having a predetermined radius is set. The center of the circle B is the position information P2.

  In S109, the current position display is deleted for display update. In S110, common tangents C and D for the circles A and B are calculated. In S111, the contact points a1 and a2 of the tangent lines C and D in the circle A and the contact points b1 and b2 of the tangent lines C and D in the circle B are calculated.

  Finally, in S112, the trapezoid formed by the circles A and B and the contacts a1, a2, b1, and b2, that is, W2 in FIG. In this drawing method, the overlapping portions of the circle A, the circle B, and the trapezoid are wasted, but such a drawing method is the simplest and has few mistakes.

  FIG. 20 is an explanatory diagram of a modification of the calculation method of FIG. The present area W2 in FIG. 20 is an elliptical range including circles A and B at both ends. The height (short axis length) of the ellipse W2 is the center distance between the circles A and B, and the width (long axis length) is the radius of the circle A + the radius of the circle B + the height. Both ends of the direction are in contact with the circles A and B.

  FIG. 21 is a flowchart of the current position display processing method 130 adopting the calculation method of FIG. In the current position display processing method 130, steps that are the same as the steps of the current position display processing method 100 of FIG. 19 are denoted by the same step numbers as the corresponding steps of the current position display processing method 100, and description thereof is omitted. Only the differences will be described.

  In S131, the radius Ra of the circle A, the radius Rb of the circle B, and the center distance Rc between the circles A and B are calculated. In S132, height = Rc and width = Ra + Rb + Rc are calculated. In S133, the circles A and B are circumscribed, and the calculated height and width ellipse, that is, W2 in FIG.

  The calculation and display of the present presence area W2 described above for the portable terminal 10 can be realized not only as a device but also as a method or a program. When realized as a method, each function unit or each function unit of the mobile terminal 10 is replaced with each step for executing processing having substantially the same contents as each function. In that case, when a single functional unit or functional unit in the mobile terminal 10 is composed of a plurality of sub-functional units or sub-units, these sub-functional units or sub-units are sub-processes having substantially the same contents as each sub-function. Is replaced by a substep that executes

  Similarly, each part or each means of the apparatus according to the present embodiment is replaced with steps and substeps for executing processes and sub-processes having substantially the same contents as the functions and sub-functions, thereby realizing the method according to the present embodiment. can do.

  Furthermore, the program to which this embodiment is applied is caused to function as each unit or each means of the apparatus according to this embodiment. Another program to which the present embodiment is applied causes a computer to execute each step of the method of the present embodiment.

  Needless to say, the present invention is not limited to the above-described embodiments, and various modifications (including addition and deletion) are possible without departing from the scope of the present invention.

  This specification discloses various ranges and levels of the invention. In addition to various devices and methods of various technical scopes and specific levels described in the present specification, the present invention has operations and effects independent of each device and each method within the scope of expansion or generalization. Extracting one or more elements, changing one or more elements within the scope of expansion or generalization, and combining one or more elements between devices and methods Includes replacements.

10: mobile terminal, 11: CPU, 12: GPS receiving unit, 13: wireless communication unit, 14: display unit, 15: operation unit, 16: information storage unit, 17: clock / timer unit.

Claims (6)

A current position measurement unit for measuring the current position of the aircraft;
A storage medium control unit that stores position information related to the current position of the positioning at each time point in a storage medium so that the position after the positioning time can be distinguished;
An indexing unit for determining a current position existence range based on past and current position information read from the storage medium;
A display control unit for displaying the current position existence range on a display;
A terminal comprising:   2. The terminal according to claim 1, wherein the position information related to the positioning current position is information specifying a positioning current position itself or a position obtained by correcting the positioning current position.   The current position existence range is a circle centered on a position specified by previous or current position information, or a circle or an ellipse having the position as a point on the circumference. Or the terminal of 2.   The terminal according to claim 1, wherein the current position existence range is a range including an error range at both ends of the previous and current positioning current positions. A current position positioning step for measuring the current position of the aircraft;
A storage medium control step for storing in a storage medium so that position information relating to the current position of positioning at each time point can be distinguished;
An indexing step of determining a current position existence range based on past and current position information read from the storage medium;
A display control step for displaying the current position existence range on a display;
A terminal control method comprising:   The program which makes a computer function as a terminal of any one of Claims 1-4.

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