JP2014006077A - Navigation device, navigation system, navigation method, and navigation program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a navigation device capable of performing appropriate navigation for a user by guiding based on the measuring accuracy of a current place.SOLUTION: A navigation device 1 includes positioning means 10 for positioning a current place, and direction display means 44 for displaying a direction from the current position to a moving destination by using a fan-shaped graphics. The positioning means 44 includes a fan-shaped graphics generation part 47 for generating the fan-shaped graphics of a center angle based on the measuring accuracy of the current place, and a fan-shaped graphics display part 48 for matching the arc direction from the fan-shaped center point generated by the fan-shaped graphics generation part 47 with the direction from the current position to the moving destination, and displaying it superimposed on a current position on a map obtained from storage means 50.

Description

  The present invention relates to a navigation device, a navigation system, a navigation method, and a navigation program.

In recent years, with the improvement of the performance of mobile devices such as mobile phones and smartphones, services that utilize these devices as navigation devices for pedestrians and bicycles have also become widespread.
For example, there is known a navigation device that acquires a current location by a GPS receiver, searches for a route from the current location to a destination, and displays an arrow in a direction in which a user should travel according to the route to navigate ( For example, Patent Document 1).

  In Patent Literature 1, guidance in the direction in which the user should proceed is performed by displaying an arrow heading to the destination on a map. If the mobile device has a built-in gyro sensor, the direction of the map can be adjusted to the orientation of the mobile device. Therefore, the user can reach the destination by proceeding in the direction of the displayed arrow.

JP 2001-91270 A

However, the current location acquired by GPS or the like is not necessarily accurate, and an error often occurs. For example, a radio wave transmitted from a satellite having a low elevation angle has a long distance to reach the GPS receiver, and thus is affected by the atmosphere and contributes to an error. In addition, an error may occur due to the influence of multipath due to reflection of radio waves on a building or a tree such as a building.
For this reason, an error occurs in the current location obtained by positioning, and an error is also included in the direction of the arrow displayed from the acquired current location to the destination as in Patent Document 1, and the user is in the wrong direction. There was a problem of being guided to.

  An object of the present invention is to provide a navigation device, a navigation system, a navigation method, and a navigation program capable of performing appropriate navigation for a user by performing guidance based on measurement accuracy of the current location.

  The navigation apparatus of the present invention comprises positioning means for measuring the current location, and direction display means for performing direction display from the current location to the destination using a fan-shaped figure, wherein the direction display means is the positioning means. A fan-shaped graphic generation unit that generates a fan-shaped graphic with a central angle based on the measurement accuracy of the current location by the present position, and the direction from the central point of the fan-shaped generated by the fan-shaped graphic generation unit to the arc, from the current position to the destination And a fan-shaped graphic display unit that displays the current position on the map obtained from the storage unit in a superimposed manner.

  In the present invention, it is possible to perform appropriate navigation for the user by performing guidance based on the measurement accuracy of the current location.

The block diagram which shows the structure of the navigation apparatus of 1st Embodiment of this invention. The flowchart which shows the direction display process of the said 1st Embodiment. The flowchart which shows the direction display process in the sector of the said 1st Embodiment. Explanatory drawing explaining the production | generation method of the fan-shaped figure of the said 1st Embodiment. The figure which shows the example of a display with the navigation apparatus of the said 1st Embodiment. The figure which shows the other example of a display with the navigation apparatus of the said 1st Embodiment. The block diagram which shows the structure of the navigation apparatus of 2nd Embodiment of this invention.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described based on the drawings.
The navigation apparatus 1 of 1st Embodiment is a terminal device which a user carries and uses like a mobile phone and a smart phone. The navigation device 1 may be a dedicated navigation device for pedestrians or bicycle users.

[Entire configuration of navigation device]
As shown in FIG. 1, the navigation device 1 includes positioning means 10 for acquiring current location information, input means 20, display means 30, control means 40, and storage means 50. The control means 40 is constituted by a CPU (Central Processing Unit) or the like.

  The storage unit 50 includes a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. The storage means 50 stores OS (Operating System: basic software), programs for controlling the positioning means 10, the input means 20, the display means 30, and the like, as well as various application software (applications), various data, and the like. The CPU reads a program stored in the storage means 50 and performs various processes according to the program.

The storage unit 50 includes a map information storage unit 51.
The map information storage means 51 stores map data. This map data can be obtained in advance by downloading from a server device that provides the map data. If the map data is downloaded and stored in the map information storage means 51, the map can be displayed even when the communication means 12 is not communicating with the server device.

[Configuration of positioning means]
The positioning means 10 includes GPS receiving means 11 for receiving satellite signals transmitted from a GPS (Global Positioning System) satellite or the like.
In addition, the navigation device 1 includes communication means 12 for calling and data communication. The communication means 12 includes a mobile phone communication means 13 and a wireless LAN communication means 14.
The mobile phone communication means 13 is a communication means using a communication standard for mobile phones. The wireless LAN communication means 14 is a communication means using a wireless LAN communication standard such as Wi-Fi (registered trademark).

These communication means 12 can also measure the approximate current location by analyzing which base station is receiving radio waves. For this reason, the communication means 12 also functions as the positioning means 10.
That is, the navigation device 1 includes three types of positioning means 10, that is, a GPS receiving means 11, a mobile phone communication means 13, and a wireless LAN communication means 14. Then, the positioning means 10 outputs the current location information (latitude and longitude) measured by any one of the GPS receiving means 11, the mobile phone communication means 13, and the wireless LAN communication means 14 to the control means 40.

[Measurement accuracy of positioning means]
The current location measured by the GPS receiving unit 11, the mobile phone communication unit 13, and the wireless LAN communication unit 14 has measurement accuracy (error distance) that is influenced by each positioning mechanism, reception environment (signal strength), and the like.
For this reason, the GPS receiving means 11, the mobile phone communication means 13, and the wireless LAN communication means 14 of the positioning means 10 output the measurement accuracy (error distance) at the time of measurement to the control means 40 in addition to the measured current location information. . Table 1 shows an example of measurement accuracy when measured under a certain measurement condition in a certain place.

In the case of the GPS receiving means 11, when a satellite signal with a high elevation angle in the zenith direction (a signal with high signal intensity) can be received, the measurement accuracy is suppressed to about 5 m. For this reason, the GPS receiving means 11 has a measurement accuracy (error distance) of 5 m when the measurement conditions are relatively good, such as when the current location is determined from a signal whose signal strength is equal to or greater than a preset threshold. There is a case. On the other hand, the measurement accuracy may be about 50 to 100 m immediately after the start of measurement or when the measurement conditions are bad. Since the measurement accuracy of the GPS receiving unit 11 depends on measurement conditions such as signal strength, the GPS receiving unit 11 outputs the measurement accuracy according to the measurement conditions.
Even when the current location is measured by the mobile phone communication means 13, the measurement accuracy varies depending on the measurement conditions. Therefore, in the example of Table 1, the measurement accuracy (error distance) by the mobile phone communication means 13 is 100 m. However, depending on the measurement conditions, the measurement accuracy may be a smaller value. Sometimes it becomes. For this reason, the cellular phone communication means 13 outputs the measurement accuracy according to the measurement conditions.
Even when the current location is measured by the wireless LAN communication means 14, the measurement accuracy changes depending on the measurement conditions. For example, if a relatively large number of base stations are at a short distance, the measurement accuracy is high, and if the number of base stations is small and the distance is long, the measurement accuracy is lowered. Therefore, in the example of Table 1, the measurement accuracy (error distance) by the wireless LAN communication unit 14 is 15 m. However, depending on the measurement conditions, the measurement accuracy may be a smaller value. Sometimes it becomes. Therefore, the wireless LAN communication unit 14 outputs the measurement accuracy according to the measurement conditions.
As will be described later, this measurement accuracy is used by the control means 40 when generating a fan-shaped figure for direction display.

[Configuration of input means and display means]
The input means 20 is a touch panel, a voice input, a keyboard, a mouse, or the like provided in the navigation device 1 and inputs at least a destination.
The destination is not limited to the final destination (destination), but also includes transit points in the movement route. That is, the user inputs a destination to move by walking or bicycle.
As a method for inputting the destination (destination or waypoint), map data may be displayed on the display means 30 and the destination may be specified by touch operation or the facility name or address may be input by key input or voice input. The method of inputting by may be used. Furthermore, a point registered in advance, such as a home, may be selected, and it is only necessary to acquire information on the latitude and longitude of the point that will eventually become the destination.
The display means 30 can use a general display device such as a mobile phone or a smart phone constituted by a liquid crystal panel, an organic EL panel, or the like.

[Configuration of control means]
The control means 40 controls the destination information acquisition means 41 for acquiring the destination information (the latitude / longitude data of the destination) input by the input means 20 and the positioning means 10 to control the current location information (the current location's travel longitude). Data), and further, current position information acquisition means 42 for acquiring error distance data of the current position output from the positioning means 10, distance calculation means 43 for calculating a linear distance from the current position to the destination, and movement from the current position And direction display means 44 for displaying the direction toward the front.
These destination information acquisition means 41, current location information acquisition means 42, distance calculation means 43, and direction display means 44 are realized by application software (application) for navigation installed in the navigation device 1.

[Configuration of direction display means]
The direction display unit 44 includes a message display unit 45 and a fan-shaped direction display unit 46.
The message display unit 45 displays the message on the map on the display unit 30 when the positioning result is a predetermined condition, as will be described later.

[Configuration of sector direction display]
The sector direction display unit 46 includes a sector shape generation unit 47 and a sector shape display unit 48.
The fan-shaped figure generation unit 47 includes the destination acquired by the destination information acquisition unit 41 and the current location information acquisition unit 42, the latitude / longitude data and the error distance data of the current location, and the linear distance calculated by the distance calculation unit 43. Is used to generate a fan-shaped figure for direction indication.
The fan-shaped graphic display unit 48 displays the fan-shaped graphic generated by the fan-shaped graphic generating unit 47 on the map on the display means 30.

[Direction display processing by navigation device]
The direction display processing for guiding the direction from the current location to the destination in the navigation device 1 will be described with reference to the flowcharts shown in FIGS.
In the navigation device 1, when the navigation application is executed by the user's operation, the movement destination information acquisition unit 41 acquires the movement destination information input by the input unit 20 (step S1).

Further, the current location information acquisition unit 42 operates the positioning unit 10 to acquire current location information (step S2).
That is, the positioning means 10 measures the current location using any of the GPS receiving means 11, the mobile phone communication means 13, and the wireless LAN communication means 14. In this case, the positioning means 10 performs the positioning process in a predetermined order. Although the order of this measurement process can be set as appropriate, an example is as follows.
First, the positioning means 10 measures the current location by the GPS receiving means 11. At this time, if the GPS receiving unit 11 cannot perform the positioning process because the number of satellite signals necessary for the positioning process (for example, four) cannot be captured, the positioning unit 10 determines the current position by the wireless LAN communication unit 14. I do.
Further, when the wireless LAN communication means 14 is in an off state or cannot receive radio waves from a wireless LAN base station, the positioning means 10 performs positioning of the current location by the mobile phone communication means 13. Since the mobile phone communication means 13 can receive the radio waves of the base station at almost any place other than the area where the mobile phone radio waves do not reach such as underground or mountainous areas, the current location can be measured. On the contrary, the positioning process by the GPS receiving means 11 is effective in areas where mobile phone radio waves and wireless LAN radio waves do not reach such as mountainous areas.
Note that the order of the positioning processing is not limited to the above example. Further, when the measurement error in the positioning process of any one of the GPS receiving unit 11, the cellular phone communication unit 13, and the wireless LAN communication unit 14 is smaller than a preset threshold value (when the measurement accuracy is high), other It may be completed without performing the positioning process by the positioning means. For example, the positioning processing is performed in the order of the cellular phone communication means 13, the wireless LAN communication means 14, and the GPS receiving means 11, which consumes less power in the positioning process, and the positioning process by the cellular phone communication means 13 or the positioning by the wireless LAN communication means 14 is performed. If the current position with high measurement accuracy can be acquired by the process, the process may be terminated without performing the subsequent positioning process.

  The current location information acquisition unit 42 acquires current location information (latitude / longitude data) and error distance data from the positioning unit 10.

Next, the distance calculation means 43 calculates a linear distance (distance between points) from the current location to the destination using the latitude / longitude data of the current location and the latitude / longitude data of the destination (step S3).
The direction display unit 44 compares the error distance acquired by the current location information acquisition unit 42 with the distance between points calculated by the distance calculation unit 43, and determines whether the distance between points is larger than the error distance (step S4).

When the distance between points is equal to or less than the error distance and the determination is “No” in step S4, the direction display unit 44 operates the message display unit 45 to execute message display processing (step S5).
That is, when the error distance is equal to or less than a preset threshold value (for example, 50 m), the message display unit 45 displays a message “Around the destination”.
In addition, when it is determined “No” in step S4, the message display unit 45 indicates that “the navigation cannot be performed because the measurement error is large” when the error distance is greater than or equal to a preset threshold value (for example, 50 m). Display a message.

[Sector shape display]
When the distance between the points is larger than the error distance and the determination is “Yes” in step S4, the direction display unit 44 operates the sector direction display unit 46 to execute the sector direction display process (step S10).
FIG. 3 shows a flowchart of the fan-shaped direction display processing S <b> 10 by the fan-shaped direction display unit 46.
As shown in FIG. 4, the sector figure generation unit 47 of the sector direction display unit 46 has a circle whose center is the current location measured by the positioning unit 10 and whose measurement accuracy (error distance) acquired from the positioning unit 10 is a radius. It is set on the map data (step S11).

In FIG. 4, a mark “S” indicating start indicates the current location 100 measured by the GPS receiving unit 11, and a circle 101 whose radius is the error distance R101 of the GPS receiving unit 11 is indicated by a solid line.
In FIG. 4, the circle 102 measured by the wireless LAN communication unit 14 is shown by a one-dot chain line, and the circle 103 measured by the mobile phone communication unit 13 is shown by a two-dot chain line. These error distance circles 101, 102, and 103 are examples in the case of Table 1 described above, and the radius of each circle varies depending on the measurement conditions and the like.

Next, the sector graphic generation unit 47 sets the destination 110 acquired by the destination information acquisition unit 41 in the map data. In FIG. 4, the movement destination 110 is indicated by a mark “G” indicating a goal. Then, the sector graphic generation unit 47 draws two tangent lines 121 and 122 from the destination 110 to the circle 101 (step S12).
Then, the sector graphic generation unit 47 calculates an angle α formed by the two tangents 121 and 122 set on the map data (step S13).

  The sector graphic generation unit 47 generates a sector 131 graphic having the angle α as a central angle and a straight line distance (distance between points) calculated by the distance calculation unit 43 as a radius. (Step S14).

  The sector graphic display unit 48 aligns the center of the sector 131 generated by the sector graphic generation unit 47 with the current location 100, and aligns the bisector of the central angle α of the sector 131 with the destination 110. It is overlaid and displayed together with the map data on the display means 30 (step S15).

Thus, the central angle and the radius of the figure of the sector 131 are set by the error distance of the positioning means 10 and the distance between points. For example, as shown in FIG. 4, even if the current location 100 and the destination 110 are the same, if the radius 102 based on the error distance of the positioning means 10 is R102, the sector 102 has a central angle β and the radius is R103. Is a sector 133 having a central angle γ.
That is, when the current location and the destination are the same, if the error distance of the positioning means 10 increases as R101 <R101 <R103, the central angles of the direction display sectors 131 to 133 also increase as α <β <γ.
Further, since the central angle is an angle formed by the tangent lines 121 and 122 drawn on the circle whose radius is the error distance from the destination 110, if the error distance is the same, the shorter the distance between the points, the larger the longer the distance. Get smaller.
Therefore, the user can intuitively grasp the error of the current location and the distance between points by looking at the sector shape (center angle and radius) displayed on the map.

  The sector graphic display unit 48 changes the sector graphic size according to the scale of the map displayed on the display means 30. That is, when a map from the current location to the destination is displayed on the display means 30, the sector graphic display unit 48 aligns the center of the sector graphic with the current location, and the bisector of the central angle intersects the arc. Is displayed according to the destination. Further, when only one of the current location or the destination is displayed on the display means 30, or when both are not displayed, the fan-shaped figure display unit 48 displays the above-described line segment connecting the current location and the destination. The fan-shaped figure is displayed in the range displayed on the display means 30 so that the bisectors of the central angle of the fan shape overlap.

FIG. 5 shows an example of the navigation device 1 in which the direction display map M1 in which the sector display 135 is superimposed on the map data by the sector graphic display unit 48 is displayed on the display means 30.
In the example of FIG. 5, it can be seen that since the center angle of the sector 135 is large, the error distance of the current location is relatively large and the distance between points is relatively short. Therefore, the user can grasp that the current location 100 shown on the map M1 may be deviated from the actual position, and can determine that the user should proceed in the direction of the central angle indicated by the sector 135.

FIG. 6 shows a direction display map M2 in the case where the error distance of the current location is the same as in FIG. 5 but the distance between the current location 100 and the destination 110 is long. In FIG. 6, the sector 135 of FIG. 5 is indicated by a dotted line for comparison. The map M2 is displayed on the display means 30 with a sector 136 indicating the traveling direction superimposed on the map data.
If the distance between points is longer than the error distance of the current location, the influence of the error of the current location becomes relatively small when calculating the traveling direction. That is, even when the error in the current location is as large as 100 m, if the distance between the points is 2 km or more, which is larger than the error distance, the difference in angle in the direction from two points 100 m away to the destination is small. Therefore, the influence of the error range is reduced, and the central angle of the sector 136 shown in FIG.

[Effects of First Embodiment]
According to the above 1st Embodiment, there can exist the following effects.
The error distance of the positioning means 10 that measures the current location is grasped, and when the distance between the points is larger than the error distance, the direction of the moving destination is displayed in a sector shape using the sector direction display unit 46. For this reason, the possibility of getting lost can be reduced as compared with the conventional case of displaying the direction of the destination with an arrow.
That is, if the current location measurement includes an error and the current location is different from the actual position, the navigation device 1 may display an incorrect direction. In this case, since the navigation device 1 clearly indicates the direction, the user thinks that the specified direction is correct and is likely to move according to the specified direction. For this reason, the user may move along the wrong guide direction and may not be able to reach the destination.
On the other hand, in this embodiment, the moving direction is displayed by a fan-shaped figure instead of an arrow. For this reason, the user can grasp that an error is included in the measurement of the current location, and the current location may be different from the actual position. Therefore, the user understands that there is a destination in the fan-shaped arc range (center angle range) but cannot specify a specific direction. Move carefully. That is, when the direction is displayed with an arrow, the user proceeds in the designated direction without judging the direction by himself / herself. Therefore, if the instruction is incorrect, the user is likely to get lost. On the other hand, in this embodiment, since the direction of the moving destination is displayed as a fan-shaped figure, at least an incorrect direction is not presented as information. For this reason, since the user does not make a determination based on erroneous information when determining the traveling direction by himself / herself, the possibility of reaching the destination as a result is increased.

  Further, the fan-shaped figure has a smaller central angle as the measurement accuracy (error distance) at the current location is higher, and a larger central angle as the measurement accuracy is lower. For this reason, the user can grasp the measurement accuracy of the present location by the center angle of the sector. For this reason, if the user determines that a positioning process with higher measurement accuracy is necessary, if the user performs positioning again using the GPS receiving means 11 with a small error distance, the correct moving direction can be easily grasped. . Therefore, even a user with weak sense of direction can reach the destination without hesitation by using the positioning means 10 with high measurement accuracy and moving after the direction is indicated by a fan-shaped figure with a small central angle. Can do.

  Furthermore, in the present embodiment, since the fan-shaped figure is generated using not only the error distance but also the point-to-point distance, even if the error distance of the current location is the same, the fan-shaped central angle is changed depending on the distance to the destination. . For this reason, the direction of a movement destination can be instruct | indicated appropriately with a fan-shaped figure.

  In the present embodiment, when the distance between points is equal to or less than the error distance, a message is displayed, so that an appropriate display can be performed according to the situation. That is, when the distance from the current location to the destination is less than the error distance, and if the error distance is less than the predetermined value, it can be assumed that the current location is near the destination, Just send a message. On the other hand, when the error distance is larger than the predetermined value, appropriate navigation cannot be performed. Therefore, by displaying that fact, navigation with incorrect information can be prevented. Therefore, an appropriate display can be performed according to the situation.

Further, since the fan-shaped figure generating unit 47 generates a fan-shaped figure by the process shown in FIG. 3, setting of a circle based on an error distance, setting of a tangent to the circle from the movement destination, detection of an angle formed by the tangent, A fan-shaped figure can be generated by a simple process such as detection of the distance between points. Accordingly, the fan-shaped figure generation unit 47 and the fan-shaped figure display unit 48 can be realized by an application that operates on a smartphone or a mobile phone.
Furthermore, since the center angle is obtained by drawing a tangent line from the destination for the circle based on the error distance, a fan-shaped figure that takes into account the distance between points can be generated, and an appropriate direction can be indicated to the user. .

  Furthermore, since the navigation device 1 stores the map data in the map information storage means 51, the direction display maps M1 and M2 can be displayed on the display means 30 without being connected to the server device by the communication means 12. For this reason, it is not necessary to always operate the communication means 12 for communication, power consumption can be reduced, and the operation duration time of the navigation device 1 can be increased. In addition, navigation can be performed by displaying map data even in places where mobile phone radio waves or wireless LAN radio waves do not reach, such as in mountainous areas, which is also effective as a navigation apparatus 1 for mountain climbing.

[Second Embodiment]
The second embodiment is different from the first embodiment in that the map data distributed from the server device 7 is received and displayed instead of downloading and storing the map data in the storage means 50 of the navigation device. Therefore, the second embodiment is a navigation system 200 that uses the navigation device 1 </ b> A while communicating with the server device 7.

  A navigation system 200 according to the second embodiment includes a server device 7 and a navigation device 1A that is a terminal device connected to the server device 7 via the Internet 8 so as to be capable of bidirectional communication.

The server device 7 includes point information acquisition means 71, map information transmission means 72, and map information storage means 73. The map information storage means 73 stores map data.
The point information acquisition unit 71 acquires the destination information of the destination and the current location transmitted from the communication unit 12 of the navigation device 1 </ b> A via the Internet 8.
The map information transmission means 72 reads the map data of the spot information acquired by the spot information acquisition means 71 from the map information storage means 73 and transmits it to the navigation device 1A.

  Compared with the navigation device 1 of the first embodiment, the navigation device 1A is such that the map information acquisition means 49 is added to the control means 40, and the map information storage means 51 of the storage means 50 is temporarily stored as map information. The difference is that the means 52 is changed. Since other configurations are the same as those of the navigation device 1, the description thereof is omitted.

The map information acquisition means 49 is the destination information (latitude / longitude data) input by the input means 20 and acquired by the destination information acquisition means 41, and is measured by the positioning means 10 and acquired by the current location information acquisition means 42. The current location information (latitude and longitude data) is transmitted to the server device 7 using the communication means 12.
Then, the map information acquisition unit 49 acquires the map data transmitted from the map information transmission unit 72 of the server device 7 and stores it in the map information temporary storage unit 52.
Furthermore, the map information acquisition means 49 is not the map data temporarily stored in the map information temporary storage means 52, such as when the area of the map displayed on the display means 30 is moved by the operation of the input means 20. When the map data is necessary, the map data is received from the server device 7, stored in the map information temporary storage means 52, and displayed on the display means 30.

  As described above, the navigation device 1A of the navigation system 200 according to the second embodiment executes the same processing as that of the first embodiment except that processing for acquiring map data from the server device 7 is added.

  The server device 7 performs the same processing as that of a general server device, except that the map data is read from the map information storage unit 73 and transmitted in response to a request from the map information acquisition unit 49 of the navigation device 1A. .

[Effects of Second Embodiment]
Also in the second embodiment described above, the same operational effects as in the first embodiment can be obtained.
Furthermore, the map data stored in the map information temporary storage means 52 is so-called cache data that is temporarily stored, and only the minimum necessary map data from the current location to the destination needs to be temporarily stored. For this reason, the storage capacity of the map information temporary storage means 52 can be reduced and the cost can be reduced, and if the map data stored in the map information storage means 73 of the server device 7 is updated to the latest version, the navigation device 1A. There is an advantage that the latest map data can always be used.

[Modification]
In addition, this invention is not limited to embodiment mentioned above, In the range which can achieve the objective of this invention, the deformation | transformation shown below is also included.
For example, the navigation device 1, 1A may be provided with an acceleration sensor, a gyro sensor, or the like, and when it is detected that the navigation device 1, 1A has moved, the current location may be updated based on the detected movement data. In this case, the direction display means 44 may move the fan-shaped figure indicating the direction in conjunction with the movement of the current location.
If comprised in this way, when a user moves, a moving direction can be displayed in real time in conjunction with the movement. Further, since the movement can be detected by an acceleration sensor or the like, the positioning processing of the current location by the positioning means 10 may be executed at a certain time interval such as 30 minutes or 1 hour, and power consumption can be reduced accordingly.

  In addition, when an acceleration sensor or a gyro sensor is provided, even if it is detected that the position has been moved from the position previously measured by the positioning result of the positioning means 10, if the acceleration sensor or the gyro sensor does not detect movement, If the movement amount of the positioning result by the positioning means 10 is determined to have a larger error than the movement amount detected by the acceleration sensor or the gyro sensor, the direction display means 44 detects the error included in the positioning result of the positioning means 10. It is preferable that the positioning result is not used when it is determined that is large. On the other hand, when the error of the positioning result is small, the same processing as in the first and second embodiments may be performed using the positioning result as the current location to display the sector direction.

  Further, when the current location information is acquired by the positioning means 10 while the user is moving, if the error distance or the direction to the destination changes, the fan-shaped figure may be changed and reflected in real time. . In this way, by changing the shape and orientation of the fan-shaped figure in real time, it is possible to simultaneously represent the direction accuracy of the moving direction and direction.

The fan-shaped figure generation unit 47 of the above embodiment generates a fan-shaped figure by the process shown in FIG. 3, but the fan-shaped generation method is not limited to the above-described embodiment. For example, in the above embodiment, the sector radius is set according to the distance between points, but the radius of the sector is not limited to the distance between points, and may be changed depending on the scale of the map displayed on the display means 30.
Further, the radius of the sector shape is not limited to the distance between points, and may be constant. For example, when the positioning process by the positioning means 10 is performed at regular intervals, the sector radius may be set according to the amount of movement of the user according to the process interval. For example, when walking at a speed of 4 km per hour, if the positioning process is performed every 10 minutes, it moves about 667 m during the processing interval (10 minutes). In this case, the radius of the sector may be set to about 667 m.
However, if the sector radius is set according to the point-to-point distance, that is, the sector radius is increased as the point-to-point distance increases, there is an advantage that the user can grasp the point-to-point distance from the sector-shaped figure. In particular, if the sector radius is set to a point-to-point distance as in the above-described embodiment, the measurement accuracy is high. There is an advantage that the user can easily understand the destination.

  Further, the method of obtaining the sector central angle is not limited to a method of obtaining an error distance circle and obtaining an angle formed by two tangent lines drawn from the movement destination. For example, the relationship between the error distance and the center angle may be set in advance so that the center angle increases as the error distance increases and the center angle decreases as the error distance decreases.

  In the second embodiment, the fan direction display unit 46 is provided in the navigation device 1A. However, the server unit may be provided with a sector direction display unit. In other words, each information of the destination, the current location and the measurement accuracy is transmitted from the navigation device to the server device, a fan-shaped figure is generated from the information on the server device side, and a map for direction display is created on the map data, The navigation device may display a direction display map transmitted from the server device.

  In addition, the navigation devices 1 and 1A are provided with a camera, and means for realizing augmented reality (AR) in which an image captured by the camera is superimposed on the display by the message display unit 45 or the fan-shaped direction display unit 46 and displayed. May be added.

DESCRIPTION OF SYMBOLS 1, 1A ... Navigation apparatus, 10 ... Positioning means, 20 ... Input means, 30 ... Display means, 40 ... Control means, 41 ... Destination information acquisition means, 42 ... Present location information acquisition means, 43 ... Distance calculation means, 44 ... Direction display means 45 ... Message display section 46 ... Fan-shaped direction display section 47 ... Fan-shaped figure generation section 48 ... Fan-shaped figure display section 49 ... Map information acquisition means 50 ... Storage means 51 ... Map information storage means 52 ... Map information temporary storage means, 7 ... Server device, 71 ... Point information acquisition means, 72 ... Map information transmission means, 73 ... Map information storage means, 200 ... Navigation system.

Claims (10)

A positioning means for measuring the current location;
Direction display means for performing direction display from the present location to the destination using a fan-shaped figure,
The direction display means includes
A fan-shaped figure generating unit that generates a fan-shaped figure with a central angle based on the measurement accuracy of the current location by the positioning means;
A sector shape that displays the direction from the center point to the arc of the sector shape generated by the sector shape generation unit in a direction from the current location to the destination, superimposed on the current location on the map acquired from the storage means. A graphic display,
A navigation device comprising: The navigation device according to claim 1, wherein
The fan-shaped figure generation unit
As the measurement accuracy of the positioning means increases, the central angle of the sector is reduced,
A navigation device, wherein the central angle of the sector is increased as the measurement accuracy of the positioning means becomes lower. The navigation device according to claim 1 or 2,
The fan-shaped figure generation unit
The measurement accuracy of the positioning means is a radius, a circle centered on the current location is set on the map data,
A navigation apparatus, wherein two tangents are set from the destination to the circle, an angle formed by the two tangents at the destination is calculated, and set to the central angle of the sector. The navigation device according to any one of claims 1 to 3,
The fan-shaped figure generation unit
The navigation device characterized in that the radius of the sector is increased as the distance from the current location to the destination increases. The navigation device according to claim 4, wherein
The fan-shaped figure generation unit
A navigation device characterized in that a distance from the present location to a destination is the sector radius. The navigation device according to any one of claims 1 to 5,
The direction display means includes
Find the distance from the current location to the destination,
If the distance is greater than the measurement accuracy of the current location, the direction is displayed using the fan-shaped figure,
A message display is performed when the distance is less than the measurement accuracy of the current location. A navigation device and a server device connected to the navigation device so as to be capable of bidirectional communication;
The server device
Storage means for storing map data;
Point information acquisition means for acquiring at least current location and destination information from the navigation device;
Map information transmission means for transmitting at least the map data of the current location and the destination to the navigation device;
The navigation device
Positioning means for measuring the current location, direction display means for displaying the direction from the current location to the destination using a fan-shaped figure, and information on the current location and the destination measured by the positioning means are transmitted to at least the server device And map information acquisition means for acquiring the map data from the server device,
The direction display means includes
A fan-shaped figure generating unit that generates a fan-shaped figure with a central angle based on the measurement accuracy of the current location by the positioning means;
The direction from the center point of the sector generated by the sector graphic generation unit to the arc is overlapped with the current location on the map acquired from the server device in accordance with the direction from the current location to the destination. And a fan-shaped figure display unit. A navigation method executed by a navigation device comprising positioning means for measuring a current location and storage means for storing map data,
The navigation device
Generate a fan-shaped figure with a central angle based on the measurement accuracy of the current location by the positioning means,
The navigation method, wherein the fan-shaped figure is displayed on a display unit so as to overlap the map data read from the storage unit. A navigation program executed by a navigation device comprising positioning means for measuring the current location and storage means for storing map data,
In the navigation device,
Generating a fan-shaped figure with a central angle based on the measurement accuracy of the current location by the positioning means;
Displaying the fan-shaped figure on the display means so as to overlap the map data read from the storage means;
A navigation program for running. A navigation program comprising a positioning means for measuring the current location and executed by a navigation device connected to the server device so as to be capable of bidirectional communication,
In the navigation device,
Transmitting at least information on the current location and the destination measured by the positioning means to the server device;
Obtaining map data relating to the current location and destination from the server device;
Generating a fan-shaped figure with a central angle based on the measurement accuracy of the current location by the positioning means;
Displaying the fan-shaped figure on the display unit in a manner superimposed on the map data acquired from the server device;
A navigation program for running.