JP2004340633A - Cellular phone having navigation function, and navigation method for using cellular phone having navigation function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve precision in navigation that a cellular phone having navigation functions performs. <P>SOLUTION: The cellular phone 2 has a GPS unit 31 for specifying the current position by receiving electromagnetic waves from an artificial satellite, and performs navigation processing by calculating the current position. Then, a navigation processing section 30 for performing navigation processing has a means for receiving correction data regarding navigation processing from another device, such as a navigator terminal 3 or a measuring instrument 4 of vehicle speed pulses, and a means for detecting the connection of another device. Additionally, the cellular phone 2 is switched to perform navigation processing, based on the received correction data when another device is connected, and to perform navigation processing, based on the current position specified by a GPS unit 31 when another device is not being connected. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mobile phone having a navigation function and a navigation method using the mobile phone having a navigation function.
[0002]
[Prior art]
2. Description of the Related Art As mobile phones have higher processing capabilities and higher mounted memories, technologies for mounting various additional functions on mobile phones have been realized. Among these additional functions, a mobile phone having a navigation function of receiving a radio wave from a GPS (Global Positioning System) satellite and presenting the current position of the mobile phone together with a map has been proposed. (For example, see Patent Document 1). As a result, the user can use the navigation function by the GPS from the mobile phone, so that the restriction on the place of use is eased and the opportunity of use is increased.
[0003]
[Patent Document 1]
JP-A-2003-28662 (paragraph [0007] etc.)
[0004]
[Problems to be solved by the invention]
However, a mobile phone having a navigation function has the following problems as compared with a dedicated navigation device installed in a conventional vehicle or the like.
[0005]
First, the location of the mobile phone will be described. The mobile phone is placed inside a mobile body such as a user's hand so that the user can talk at any time. For this reason, in many cases, the installation position of the mobile phone is restricted to the vicinity of the driver's seat, and as a result, the location where the GPS radio wave is easily shielded by the roof of the moving body or the like is obtained, and the mobile phone is not received. The positioning accuracy by the GPS radio wave is reduced.
[0006]
Next, the performance of the hardware to be mounted is limited due to the restriction of the size of the mobile phone terminal. Therefore, the navigation information presented to the user from the mobile phone is inferior in accuracy such as a display interval as compared with a dedicated navigation device.
[0007]
In view of the above, it is a main object of the present invention to improve the accuracy of navigation guided by a mobile phone having a navigation function.
[0008]
[Means for Solving the Problems]
The present invention has been devised to achieve the above object, and has a GPS unit that identifies a current position by receiving radio waves from an artificial satellite, and calculates a current position to perform navigation. In the mobile phone that performs the processing, the navigation processing unit that performs the navigation process includes a unit that receives correction data related to the navigation process from a device different from the mobile phone and a unit that detects connection of the another device. When the mobile phone is connected to the another device, the navigation processing is performed based on the received correction data. When the mobile phone is not connected to the another device, the GPS is used. Switching to perform the navigation process based on the current position specified by the unit.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a mobile phone navigation system to which the present invention is applied will be described in detail with reference to the drawings. First, the configuration of the navigation system for a mobile phone according to the present embodiment will be described with reference to FIG.
[0010]
First, the mobile phone navigation system shown in FIG. 1 has a function of supplementing output data of a GPS function provided to the mobile phone. Therefore, the navigation system of the mobile phone has a navigation server 1 that has a route search function and distributes map data to the mobile phone 2, receives a radio wave from a GPS satellite with a GPS antenna, and has a built-in GPS unit. And a navigation data terminal 3 having a gyro sensor 52 for performing positioning using a GPS radio wave received by an externally provided GPS antenna and having a gyro sensor 52 for correcting the current position. This is an example of "another device"). The navigation data terminal 3 receives vehicle speed pulse data from a vehicle speed pulse measuring device 4 attached to the driven side of the transmission of the vehicle and measuring the rotation speed of the drive shaft. By attaching the mobile phone 2 to the adapter 5 connected to the navigation data terminal 3, the mobile phone 2 receives the data from the external GPS unit 51, the gyro signal from the gyro sensor 52, and the vehicle speed from the navigation data terminal 3. The vehicle speed pulse data from the pulse measuring device 4 is received.
[0011]
On the other hand, the mobile phone 2 communicates with the navigation server 1 connected to the network (IP) via wireless communication via a gateway such as a base station. The navigation server 1 has a map search function for searching for a map at a coordinate position designated along with the route search, a POI search function for searching for point information such as facilities, and an external It also has a traffic information distribution function that distributes traffic information received from the traffic information center.
[0012]
The GPS satellites continue to radiate GPS radio waves for position measurement to the ground, and the mobile phone 2 and the navigation data terminal 3 receive the GPS radio waves so that each of the GPS units receives the current position. Is calculated. Further, the mobile phone 2 receives data for correcting positioning results by GPS, such as a gyro signal from the gyro sensor 52 of the navigation data terminal 3 and vehicle speed pulse data from the vehicle speed pulse measuring device 4, and presents it to the user. Perform an operation to increase the accuracy of navigation.
[0013]
Next, a more detailed configuration of the navigation data terminal 3 will be described with reference to FIG. The navigation data terminal 3 receives a radio wave from a GPS satellite via a GPS antenna to specify a current position, a gyro sensor 52 that measures a gyro signal that is data on a traveling direction, and the entire navigation data terminal 3. It is configured to include a CPU for controlling and a power supply circuit for supplying power to each unit. The position information measured by the GPS unit 51 is transmitted to the mobile phone 2. The navigation data terminal 3 receives the information of the vehicle speed pulse measured by the vehicle speed pulse measuring device 4 and transmits the information of the gyro sensor 52 to the mobile phone 2 as correction data of the measured value of the current position. Further, the power supply circuit supplies power to the mobile phone 2 via the adapter 5.
[0014]
Further, the configuration of the mobile phone 2 will be described with reference to FIG. The mobile phone 2 exchanges information about navigation with a user, in addition to a telephone processing unit 20 that performs processing related to telephones, which is a basic function of a conventionally proposed mobile phone, and a navigation processing unit 30 that performs processing related to navigation. And an interface unit 40 serving as an interface to perform the operation. The telephone processing unit 20 includes a voice input unit 21 configured by a microphone to input a voice signal from a user, a voice output unit 22 configured by a speaker to output a voice signal, and a voice signal to an external base station. And a line communication unit 23 that communicates with the network.
[0015]
Here, the navigation processing unit 30 of the mobile phone 2 executes a GPS unit 31 for specifying a current position by a GPS radio wave from a GPS satellite group received by a GPS antenna provided on the mobile phone 2 and an application for browsing a map. Application execution unit 32, a progress history management unit 33 for holding a history of progress presented before the last time for estimating the current position when the absolute position cannot be measured by GPS, and a GPS unit of the navigation data terminal 3. An external GPS signal communication unit 34 for communicating data relating to a GPS positioning result by 51; a vehicle speed pulse communication unit 35 for receiving a vehicle speed pulse which is data for correcting the current position based on the traveling distance of the vehicle; A gyro signal communication unit 36 for communicating a gyro signal as correction data relating to Composed of Te. The data received by the external GPS signal communication unit 34, the vehicle speed pulse communication unit 35, and the gyro signal communication unit 36 are sent to the mobile phone 2 via the adapter 5 connected to the navigation data terminal 3. Note that the navigation processing unit 30 includes a mobile phone for determining whether the external GPS signal communication unit 34, the vehicle speed pulse communication unit 35, and the gyro signal communication unit 36 receive data from the navigation data terminal 3. 2 has means for detecting whether or not the navigation data terminal 3 which is another device is connected.
[0016]
The interface unit 40 of the mobile phone 2 includes a screen display unit 41 that presents information related to navigation in a screen display, a speaker unit 42 that presents information related to navigation in a sound, and a navigation unit. And an operation input unit 43 for inputting an operation related to the operation.
[0017]
The configuration of the mobile phone navigation system according to the present embodiment has been described above. Next, an outline of the operation of the navigation system for a mobile phone according to the present embodiment will be described with reference to FIGS. 1 and 2 and along FIG. FIG. 4 is a flowchart mainly focusing on the operation of the mobile phone 2. In the description of the operation, the configuration of the navigation system of the mobile phone will be clarified.
[0018]
First, S101 (preparation) will be described. The mobile phone navigation system includes a navigation data terminal 3 installed on a mobile object such as an automobile, an adapter 5 for installing the mobile phone 2 and the mobile phone 2, and a navigation server 1 communicating with the mobile phone 2. Consists of Then, each device of the navigation system of the mobile phone mounted on the moving body is activated, for example, by receiving power supply from the moving body. Further, the GPS unit 31 of the mobile phone 2 and the GPS unit 51 of the navigation data terminal 3 always receive GPS radio waves from a GPS satellite group while the device is operating. Then, the application execution unit 32 prepares an environment for executing the program using a Java (VM) (Virtual Machine) or the like, and starts application software for processing the navigation. Thereafter, the activated navigation software performs a control process of calculating position information based on a signal from the GPS unit 31 and displaying the calculated position information on the screen display unit 41.
[0019]
Next, S102 (map request) will be described. The mobile phone 2 transmits to the navigation server 1 a request related to a map for displaying a route shown to the user with the navigation. For this purpose, first, the mobile phone 2 receives a menu screen of a service provided by the navigation server 1 from the navigation server 1 and displays the menu screen. A menu screen generated by the navigation server 1 for selecting a desired destination of the user is received and displayed to prompt input of a method of selecting a desired destination (see FIG. 5A). Next, when the user selects a predetermined destination selection method via the operation input unit 43, the mobile phone 2 requests the navigation server 1 for a more detailed menu screen relating to the selection method. The menu screen sent from the navigation server 1 is, for example, text described in HTML, and each item of the menu is realized by describing a link to a detailed menu screen. Then, when a desired destination selection method is input from the menu screen, the text of the menu screen linked from the selected menu item is requested to the navigation server 1. The mobile phone 2 displays the detailed menu screen received from the navigation server 1, and allows the user to select a desired destination in more detail. FIG. 5B is an example of a menu screen when “select by genre” is selected as a destination setting selection method from the menu shown in FIG. 5A. In the example of this screen, a menu “select by genre” is further displayed, and the destination is narrowed down. Further, when a desired destination is selected by the user, the mobile phone 2 creates a route search request message including at least the desired destination and the position information of the current location, and transmits the message to the navigation server 1. When the mobile phone 2 receives the positioning result by the external GPS from the navigation data terminal 3 via the adapter 5 as the position information of the current location, the positioning information is smaller than the positioning result by the GPS unit 31 built in the mobile phone 2. , And sends the positioning result received from the navigation data terminal 3 to the navigation server 1 with priority. If it is detected from the GPS signal or the vehicle speed pulse signal that the moving body is moving (for example, 5 km / h or more), the menu operation is prohibited as a safety measure during driving.
[0020]
Then, S103 (acquisition of a map) will be described. The navigation server 1 searches for a guidance route from a current position to a desired destination by a route search function based on a request message from the mobile phone 2. Then, map data covering the entire route obtained as a result of this search is searched by the map search function. Then, a map of an area including the entire guide route is returned to the mobile phone 2 together with the searched guide route information. The map returned from the navigation server 1 includes a wide-range map (small-scale map) for representing the outline of the entire route and a narrow-range map (large-size map) for displaying detailed information around the route along the route. Scale map). Thereby, the mobile phone 2 acquires the map from the navigation server 1. 6A shows an example of an acquired map, and FIG. 6B shows a map of a narrow range in which a part of FIG. 6A is enlarged. These maps shown in FIG. 6 indicate that the current position is “S” (abbreviation of “Start”), the desired destination is “G” (abbreviation of “Goal”), and the road that becomes the route is a thicker road. The display color is different from the background color or the color indicating a general road. At the bottom of the screen of FIG. 6A, which is a display screen of a wide-range map showing the outline of the entire route, a button for instructing an operation of enlarging and displaying the vicinity of the current position is displayed. Then, the screen is switched to the screen shown in FIG.
[0021]
With the above operation, the guidance route is determined, and when the reception of the map for displaying the guidance route is completed, the route guidance by the mobile phone 2 is started. In the positioning of the current position, in order to give priority to the positioning result by the navigation data terminal 3 over the positioning result by the GPS built in the mobile phone 2, the mobile phone 2 uses the GPS from the navigation data terminal 3 via the adapter 5. It is checked whether there is data input (S104). If there is no external GPS data input, the process proceeds to S106. If there is external GPS data input, the process of S105 is performed. In S106 (acquisition of the current position by the built-in GPS) which is a process when there is no GPS data input from the outside, the mobile phone 2 is built in the mobile phone 2 based on a GPS radio wave received by a GPS antenna provided in the mobile phone 2. The GPS unit 31 measures the current position, and obtains the latitude and longitude values as the absolute coordinates of the current position on the ground.
[0022]
On the other hand, S105 (acquisition of the current position from the external GPS) which is a process when there is an external GPS data input will be described. The mobile phone 2 uses a built-in GPS unit 31 to receive GPS radio waves and acquire the current position. However, the mobile phone 2 having the built-in GPS unit 31 is connected to a hands-free device and placed inside a mobile body such as a user's hand so that the user can talk. For this reason, the installation position of the mobile phone 2 is often limited to the vicinity of the driver's seat, and the GPS radio wave received by the GPS unit 31 is easily shielded by the roof of the moving body, so that the positioning accuracy tends to decrease. On the other hand, the GPS antenna connected to the navigation data terminal 3 is hardly affected by the installation position of the navigation data terminal 3 and can be installed at a position where the reception condition of the GPS radio wave is better. Therefore, based on the GPS radio wave received by the GPS antenna connected to the navigation data terminal 3, the current position measured by the GPS unit 51 provided in the navigation data terminal 3 is determined by the mobile phone 2 with a built-in GPS. Since it is considered that the lowering of the lateral position accuracy is less likely to occur than the current position, when the GPS data is input from the navigation data terminal 3, the portable telephone 2 has a lower lateral position result than the built-in GPS unit 31. The position result of the GPS data input from the navigation data terminal 3 is adopted as the current position.
[0023]
In the GPS side position, an error occurs in the side position result depending on the propagation state of the GPS radio wave, the reception environment, or the number of usable GPS satellites. Then, it is confirmed whether gyro signal or vehicle speed pulse data is input from the navigation data terminal 3 via the adapter 5 (S107), and if these sensor information is input from the navigation data terminal 3, A current position correction process S108 is performed using the sensor information, and if sensor information has not been input, the current position measured by GPS is used.
[0024]
Then, S108 (correction of the current position), which is processing when sensor information is input from the navigation data terminal 3, will be described. The mobile phone 2 uses the navigation processing unit 30 to perform a process of correcting the current position calculated from only the GPS information in the process of S105 or S106 using the input sensor information. When the gyro signal is input, the moving direction from the current position calculated last time is calculated, and when the vehicle speed pulse is input, the moving distance from the current position calculated last time is calculated, and the lateral position result by GPS is corrected. I do. The navigation processing unit 30 monitors the connection between the mobile phone 2 and the navigation data terminal 3, and performs a correction process during a period in which the navigation data terminal 3 as another device is not connected via the adapter 5. Omitted.
[0025]
In the mobile phone 2, when the GPS data, which is the result of the position by the GPS unit 51 of the navigation data terminal 3, is received via the external GPS signal communication unit 34 instead of the result of the position by the GPS unit 31. The obtained GPS data is used as a side result. Here, the navigation data terminal 3 is not limited to a portable device. Therefore, restrictions on the size of the housing of the navigation data terminal 3, the power consumption, and the processing performance of the CPU and the like are smaller than those of the mobile phone 2 intended for carrying. Further, the GPS unit 51 of the navigation data terminal 3 can be provided on the outer surface of the moving body, and does not need to be affected by radio wave shielding by the body. Thereby, the current position calculated by the navigation data terminal 3 based on the GPS radio wave from the GPS unit 51 is more accurate and accurate than the one calculated by the mobile phone 2 based on the GPS radio wave from the GPS unit 31. It is expected that the accuracy such as the display interval is good. The current position information obtained by the GPS acquired in this way is corrected using the sensor information sent from the navigation terminal 3.
[0026]
Thus, the mobile phone 2 receives the correction data on the traveling speed of the vehicle speed pulse input to the navigation data terminal 3 from the measuring device 4 via the vehicle speed pulse communication unit 35, and corrects the current position. The vehicle speed pulse sensor is installed on the driven side of the transmission of the moving body and measures the driven side drive shaft, that is, the rotational speed of the wheels. Then, the vehicle speed pulse communication unit 35 calculates the traveling distance of the moving object per unit time from the rotation speed of the wheels and the predetermined wheel size, and performs an operation of continuously notifying the traveling distance to the mobile phone 2. . Further, the mobile phone 2 calculates the traveling speed (vehicle speed) from the traveling distance of the moving body per unit time. Note that the mobile phone 2 may calculate the traveling distance of the moving object from wheel speed pulses detected by a wheel speed detector installed on the wheels.
[0027]
Further, the mobile phone 2 receives the correction data on the traveling direction from the gyro sensor 52 of the navigation data terminal 3 via the gyro signal communication unit 36, and corrects the current position. Here, the gyro sensor 52 performs a process of continuously measuring a gyro signal that is correction data regarding the traveling direction. Hereinabove, S108 (correction of the current position) has been described. The current position calculated in S108 (correction of the current position) is recorded in the progress history management unit 33 at any time together with the calculation time.
[0028]
Here, S109 (determination of the current position) will be described. The mobile phone 2 determines the relationship between the map including the route acquired in S103 (acquisition of the map) and the current location calculated in S108 (correction of the current location) or the current location acquired by the GPS. . Note that the relationship between the map and the current position is determined by the first case in which the current position is present on the map acquired by the mobile phone 2, the current absolute position is not specified by GPS due to radio wave shielding, etc. And a third case in which the current position does not exist on any of the maps already acquired by the mobile phone 2 and stored in the memory. Hereinafter, for each case, a map presentation method according to each situation will be described more specifically.
[0029]
First, S110 (display of a map) in the first case will be described. The mobile phone 2 displays the current position on the map including the route on the screen display unit 41 (see FIG. 7A). Note that the guidance display 140 at the time of current position correction for presenting guidance to the user shown in FIG. 7A includes a map display 141 for road data including terrain data and a route, and a navigation processing unit 30. The display 142 includes a display 142 of the current position corrected by the above. Further, as shown in FIG. 7B, a map near a guidance intersection where guidance for the next route is performed may be enlarged and displayed, and the name of the guidance intersection may be displayed at the top of the map. When the display 142 of the current position approaches the intersection on the map, the mobile phone 2 determines the traveling direction of the guidance intersection shown in FIG. 7C and the distance to the intersection based on the sent route information. May be displayed. At the top of the screen of the mobile phone 2, a mark indicating the connection state between the navigation data terminal 3 and the mobile phone 2 is displayed. Among them, the display of the “+” mark 143 indicates that the navigation data terminal 3 is connected to the mobile phone 2 via the adapter 5. The display of the “G” mark 144 indicates that the GPS data is being received from the outside. By looking at these displays, the user can obtain information on the tendency of the lateral accuracy of the current position, which can help the user to grasp the current position.
[0030]
Next, S111 (display of position estimation) in the second case will be described. In this case, neither the GPS unit 51 of the navigation data terminal 3 nor the GPS unit 31 built in the mobile phone 2 succeeded in positioning by GPS radio waves, and the absolute coordinates of the current position on the ground surface by GPS could not be obtained. State. Since the measured value of the current position was not obtained, the mobile phone 2 determines the relative movement direction from the gyro signal based on the position of the traveling history stored in the traveling history Then, a process of estimating the current position by calculating a relative moving distance is performed, and the estimated position is attached to a map including a route and displayed on the screen display unit 41 (see FIG. 9). In this case, the range of the map displayed in the area of the map display 121 in the map display 120 for position estimation is around the estimated current position (current estimated position 122), and the current estimated position 122 on the guidance route is The current position mark is drawn. Then, with the current estimated position 122 as the center, a range 123 of the current estimated position, in which the range of the estimation error is represented by a figure such as a circle or a double circle, is drawn. As a result, it is possible to grasp the approximate current position even in a situation where the GPS cannot position the current position.
[0031]
Further, S112 (simple display) in the third case will be described. This case occurs when the current position is not included in the detailed map area around the route because the start position of the guidance route obtained by the route search is different from the current position. The mobile phone 2 displays, on the screen display unit 41, a simplified display indicating the relative position between the current position and the acquired route on the map (see FIG. 12A). Since the mobile phone 2 has not obtained a map near the current position, drawing of roads near the current position is omitted in the display of the simplified display 130 outside the map, and guidance along with the display 132 of the current position is omitted. A route display 131 representing the shape of the route is drawn, and a scale display 133 is drawn in a corner of the screen to help grasp the actual distance to the guidance route. When the display 131 of the current position and the route cannot be displayed on the same screen at a predetermined scale, a direction display 134 of the guidance start position viewed from the current position is drawn as shown in FIG. Displays the approximate direction of the route.
[0032]
Further, S113 (end determination) will be described. The mobile phone 2 determines whether to end or continue the processing relating to the navigation. For example, when the “stop” button displayed at the bottom of the screen for route guidance shown in FIG. 7A is selected and operated, the route guidance processing is terminated. Further, even if the user does not explicitly perform the end operation, the current position calculated in S108 (correction of the current position) or the like is set to the desired destination input by the user in S102 (map request). When the mobile phone 2 arrives or when the power of the mobile phone 2 is turned off by the user, the mobile phone 2 determines that the processing related to the navigation is to be ended (Yes in S113), and ends the processing. On the other hand, when the mobile phone 2 determines to continue the process related to the navigation (S113, No), the process returns to S104.
[0033]
The overview of the configuration of the mobile phone navigation system according to the present embodiment has been described above. Next, S111 (display of position estimation), which is the operation of the navigation system for the mobile phone of the present embodiment, will be described with reference to FIGS. 1 to 7 and along FIG. In the description of the operation, the configuration of the navigation system of the mobile phone will be clarified.
[0034]
First, S201 (calculation of the current estimated position) will be described. The mobile phone 2 calculates a current estimated position using the navigation processing unit 30. For example, the mobile phone 2 may calculate the current estimated position by using the method of correcting the current position in S108 (correction of the current position). In that case, the mobile phone 2 does not perform the position correction processing based on the current position acquired in S105 or S106 in S108 (correction of the current position), but A position correction process is performed based on a predetermined position in the recorded progress history. In addition, the mobile phone 2 may calculate the current estimated position using the progress history recorded in the progress history management unit 33. Specifically, the mobile phone 2 graphs the time-series progress history, and approximates the progress history to a predetermined mathematical expression using a spline curve or the like. Then, the current position is estimated based on the approximated formula.
[0035]
Next, S202 (calculation of the estimated range from the current estimated position) will be described. The mobile phone 2 calculates an estimation range around the current estimated position calculated in S201 (calculation of the current estimated position). The estimation range indicates the certainty of the current estimated position, and indicates that the larger the estimation range is, the more uncertain the current estimated position is.
[0036]
The estimation range is calculated by, for example, increasing the estimation range as the elapsed time from the time when the current position is lost due to radio wave shielding or the like becomes longer (for example, the estimation range uses the elapsed time as a variable). (Represented by a first-order proportional function). This is a calculation method utilizing an event that the range in which the current position is considered to move increases as the elapsed time increases. Another method of calculating the estimation range is to increase the estimation range as the vehicle speed (obtained from the vehicle speed pulse communication unit 35) at the time when the current position is lost is increased (for example, the estimation range is the vehicle speed). (Expressed as a first-order proportional function with? As a variable). Then, in accordance with the size of the calculated estimation range, the size of the graphic representing the range 123 of the current estimated position displayed on the screen of FIG. 9 is changed.
[0037]
Here, S203 (determination of the current estimated position) will be described. The mobile phone 2 determines whether or not the current estimated position calculated in S201 (calculation of the current estimated position) is near the nearest intersection in a non-passing portion on the guide route on the map. Thereby, the mobile phone 2 changes the notation method of the information of the guidance provided to the user.
[0038]
Then, S204 (absolute display regarding the traveling road and traveling direction) will be described. In S203 (determination of the current estimated position), if the current estimated position does not exist near the intersection on the map, the mobile phone 2 determines the name of the predetermined road selected as the guidance route (such as a national road or a prefectural road). The number may include a number, a highway name, a highway name, or an intersection name of the road) and a traveling direction on a predetermined road (a place name, an administrative district name, a facility name, or the like, which is a traveling direction on the predetermined road). Is displayed on the screen display unit 41 in advance as the absolute display progress guide 128 (see FIG. 10A). It should be noted that the predetermined road is a road that is close to the current estimated position and is an unpassed portion that is a target of the guidance route. In addition, when the vehicle is deviating from the guidance route, it is the road having the largest road width (such as an expressway) among the roads existing 1 km square from the current estimated position. In FIG. 10A, the notation “Please proceed at the intersection of National Highway No. 10 toward Tokyo” corresponds to the absolutely displayed travel guide 128.
[0039]
On the other hand, S205 (absolute display regarding the traveling direction) will be described. In S203 (determination of the current estimated position), if the current estimated position is near the intersection on the map, the current estimated position generally includes an error. It is thought that it has been done. Therefore, when guidance is performed by specifically specifying an intersection or the like, a state that does not match the actual route may occur. Therefore, the mobile phone 2 displays the guidance including the traveling direction to be aimed at the intersection on the screen display unit 41 as the traveling guidance 128 of the absolute display (see FIG. 10B). In FIG. 10 (B), the notation “Please proceed at the intersection toward Tokyo” corresponds to the progress guidance 128 of the absolute display.
[0040]
Here, the effect of the absolute display progress guidance 128 shown in S204 or S205 will be described more specifically. First, the process of S111 (display of position estimation) assumes a state where the current position and the current traveling direction are undetermined. In the conventional car navigation, when the current position is undetermined, navigation to the user is not performed. However, the user often desires guidance information even when the current position is undetermined. However, there is a problem that the navigation system guides wrong information significantly reduces the convenience of the user.
[0041]
Therefore, the mobile phone 2 replaces the relative travel guidance depending on the current traveling direction such as right turn, left turn, and straight ahead used in the car navigation in the conventional technique, with the travel guide of the absolute display shown in S204 or S205. Use 128. The relative travel guidance is for guiding the relative travel direction at the intersection ahead of the travel direction based on the current position and the current direction. For example, the guidance "turn right at the next intersection" is the relative traveling direction. On the other hand, the absolutely displayed travel guide 128 is a travel guide that does not depend on the current travel direction, such as “Please turn at the intersection of National Highway No. 10 toward Tokyo”. Here, at each intersection of the road, a road sign for guidance is often installed, and the road sign has an absolute display such as a well-known place name such as “Tokyo”. Therefore, the user can recognize the accurate traveling direction by collating the guidance road sign with the absolutely displayed traveling guidance 128 even when the current traveling direction is undetermined. In addition, even if the user makes a wrong intersection, the vehicle can return to the guidance route easily because the approximate direction is the correct course.
[0042]
Then, S206 (display of a map) will be described. The mobile phone 2 presents the range of the estimation in S202 (calculation of the estimated range from the current estimated position) to the user, for example, by a circle, centering on the current estimated position in S201 (calculation of the current estimated position). Therefore, as described above, the screen presented to the user (see FIG. 9) is a map display 120 for position estimation, a map display 121 for road data including terrain data and a route, and a current position estimation result for the current position. It is configured to include the estimated position 122 and a range 123 of the current estimated position estimated around the current estimated position 122.
[0043]
As above, S111 (display of position estimation) which is the operation of the navigation system for the mobile phone according to the present embodiment has been described. Thus, even when the current position is not specified due to radio wave shielding or the like, the user can obtain information that is a clue for progress.
[0044]
Next, S112 (simple display), which is an operation of the navigation system for a mobile phone according to the present embodiment, will be described with reference to FIGS. In the description of the operation, the configuration of the navigation system of the mobile phone will be clarified.
[0045]
When performing the simple display, the mobile phone 2 obtains the information by the processing of S105 (acquisition of the current position from the external GPS) or S106 (acquisition of the current position by the built-in GPS). The corrected current position has been obtained.
[0046]
First, S301 (acquisition of a route) will be described. For the route obtained in S103 (acquisition of a map), the mobile phone 2 acquires information on the latitude and longitude of each road constituting the route from the data of the map including the roads constituting the route. As a result, information on the shape of the route is obtained as values of latitude and longitude.
[0047]
Then, S302 (decision of scale) will be described. The mobile phone 2 determines the scale of the screen so that both the current position and the route can be displayed on one screen. Here, the scale of the screen is determined so as to include at least a part of the route. Therefore, the larger the distance between the current position and the route, the larger the scale.
[0048]
Further, S303 (display of a map) will be described. The mobile phone 2 presents the user with the route and the current position on the screen display unit 41 in accordance with the scale obtained in S302 (decision of the scale) (see FIG. 12A). FIG. 12A is a simplified display 130 outside the map, which is a schematic map displayed when the current position goes out of the acquired map. The shape of the route acquired in S301 is represented by the latitude and the latitude of the route. A route display 131 that displays the route as a polygonal line based on the longitude, a current position display 132 as a result of a current position acquisition unit such as a GPS, and a scale display 133 related to the displayed screen are included. Be composed. Thus, even when the current position does not exist on the downloaded map, the user can know the direction in which the route exists because the current position and a part of the route are displayed on the same screen. Therefore, the possibility that the user moves away from the route is reduced.
[0049]
Further, by setting the scale of the display to be the same as the display in S110 (display of the map), the sense of distance on the screen is matched, and even if the background map is not displayed, the discomfort to the behavior of the current position is reduced. Things are also possible. In this case, a state may occur in which both the current position and the route cannot be displayed on the same screen. Therefore, as shown in FIG. 12B, the direction of the guide route position indicating the direction closest to the guide route when viewed from the current position. The display 134 is displayed together with the display 132 of the current position. Thus, it is possible to indicate in which direction the user can reach the guidance route and receive the route guidance, so that the user can be guided to the guidance route even when the map is not displayed.
[0050]
Hereinabove, one embodiment of the present invention has been described. According to such a configuration, the accuracy of the navigation guided by the mobile phone having the navigation function can be improved. FIG. 13 shows a functional block diagram of the navigation system of the mobile phone. The vehicle speed pulse measuring device 4 sends the vehicle speed pulse detected by the vehicle speed pulse measuring function to the navigation data terminal 3 by the communication function. In the navigation data terminal 3, the positioning result based on the radio wave from the GPS satellite received by the GPS antenna connected to the navigation data terminal 3 by the GPS function, the data of the gyro sensor function for detecting the signal of the gyro sensor 52, and the vehicle speed The vehicle speed pulse data from the pulse measuring device 4 is collected by the data collection function and sent to the mobile phone 2 by the communication function. The mobile phone 2 receives the side position result, the gyro signal, and the vehicle speed pulse data from the navigation data terminal 3 by the communication function. On the other hand, the mobile phone 2 performs positioning using the GPS by the built-in GPS function. The mobile phone 2 has a voice input function, a voice output function, and a wireless communication function by the line communication unit 23 in order to realize a normal telephone function. With this wireless communication function, the mobile phone 2 communicates with the navigation server 1, receives the menu created by the menu creation function of the navigation server 1, and uses the operation input function to search for a guidance route by the route search function. , A request to cut out a map to be displayed at the time of route guidance by the map creation function. The mobile phone 2 that has received the guidance route and the map thus acquired draws the map and the route using the application execution function, displays the map and the route using the screen display function, and performs the route guidance. Also, the record moved during the route guidance is recorded and managed by the progress history management function, and is used for position estimation in the case where the GPS cannot perform the lateral position.
[0051]
The present invention described above can be widely modified and implemented without departing from the spirit of the invention. For example, focusing on a function of correcting the current position based on sensor information such as a gyro signal and vehicle speed pulse data from the navigation data terminal 3, the navigation data terminal 3 does not include the GPS unit 31 and the GPS unit built in the mobile phone 2. It is also possible to obtain the current position information from the positioning result based on the sensor data 31 based on the sensor information from the navigation data terminal 3. In this case, the processing of S104 and S105 in the flow shown in FIG. 4 is not performed, and the processing of acquiring the current position by the built-in GPS in S106 is performed. The display of the “G” mark 144 displayed at the top of the display screen indicates that the radio wave can be received by the built-in GPS antenna.
[0052]
Further, for example, in S105 (acquisition of the current position from the external GPS), it is possible to use a conventional position correction technique realized in a dedicated navigation device. As a conventional position correction technique, for example, a D-GPS (Difference Global Positioning System) that corrects a radio wave transmitted from a GPS satellite by a receiver different from a dedicated navigation device is used. Note that these conventional position correction techniques are implemented in the navigation data terminal 3, and a calculation result corrected based on this correction technique is transmitted from the navigation data terminal 3 to the mobile phone 2. When the navigation data terminal 3 does not include the GPS unit 31, data for correction such as D-GPS information is transmitted to the mobile phone 2, and the process of S108 (correction of the current position) of the mobile phone 2 is performed. The correction technique as described above may be used.
[0053]
Further, in S206 (display of map), a flag for notifying whether the display of the map is the estimated position or the actually measured position may be provided on the display screen. The display of the flag is, for example, a character string of “estimation” when displaying the position of the estimation. Further, when the distance to the guidance intersection is displayed, when the display is switched to the display of the position estimation or the like, the word “estimation” may be displayed before the display of the remaining distance to the guidance intersection. good.
[0054]
Further, in S303 (decision of scale), the positional relationship between the current position and the route changes with time as the current position moves, so that the mobile phone 2 determines the distance between the current position and the route position. It is also possible to add a process of monitoring and recalculating the scale when the distance exceeds a predetermined length.
[0055]
【The invention's effect】
According to the present invention, it is possible to improve the accuracy of navigation guided by a mobile phone having a navigation function.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a mobile phone navigation system according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of a mobile phone according to an embodiment of the present invention.
FIG. 3 is a configuration diagram of a navigation data terminal according to an embodiment of the present invention.
FIG. 4 is a flowchart showing an outline of a navigation operation according to an embodiment of the present invention.
FIG. 5 is a diagram of a menu screen for inputting a desired destination according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating an example of a map acquired by a mobile phone according to an embodiment of the present invention.
FIG. 7 is a screen display diagram of a map when a current position is present on the map according to an embodiment of the present invention.
FIG. 8 is a flowchart illustrating a position estimation display process when the GPS cannot acquire a current position according to an embodiment of the present invention.
FIG. 9 is a diagram showing an example of a position estimation display when the GPS cannot acquire a current position according to an embodiment of the present invention.
FIG. 10 is an example of a screen displaying a progress guide of absolute display according to an embodiment of the present invention.
FIG. 11 is a flowchart showing a simplified display process when the current position is outside the map according to an embodiment of the present invention.
FIG. 12 is a diagram illustrating an example of a simplified display process when the current position is outside the map according to an embodiment of the present invention.
FIG. 13 is a functional block diagram of a navigation system for a mobile phone according to an embodiment of the present invention.
[Explanation of symbols]
1. Navigation server
2. Mobile phone
3. Navigation data terminal
4: Vehicle speed pulse measuring device
5. Adapter
20: Telephone processing unit
21 Voice input unit
22 ... Audio output unit
23 ... Line communication unit
30 Navigation processing unit
31 ... GPS unit
32: Application execution unit
33: Progress history management unit
34 external GPS signal communication unit
35 ... Vehicle speed pulse communication unit
36 ... Gyro signal communication unit
40 ... Interface part
41 Screen display unit
42 ... Speaker part
43 ... operation input unit
51… GPS unit
52 ... Gyro sensor
110 ... Guidance display at the time of current position correction
111 ... Map display
112 ... Display of current position
120: Map display of position estimation
121 ... Map display
122: Current estimated position
123: range of current estimated position
128: Absolute display progress guidance
130: Simple display outside the map
131 ... Display of route
132 ... Display of current position
133 ... scale display
140 ... Guidance display at the time of current position correction
141 ... Map display
142 ... Display of current position

Claims (7)

In a mobile phone that has a GPS unit that receives a radio wave from an artificial satellite to specify a position and performs a navigation process by calculating a current position, a navigation processing unit that performs the navigation process includes: Means for receiving correction data relating to the navigation processing from another device and means for detecting connection of the another device, wherein when the mobile phone and the another device are connected, the received correction data Based on the current position specified by the GPS unit when the mobile phone and the another device are not connected, switch to perform the navigation process. A mobile phone with a featured navigation function. The navigation processing unit is configured to include an external GPS signal communication unit that receives the correction data relating to the current position, the data of the current position obtained from the GPS unit, and the external GPS signal communication unit. The mobile phone according to claim 1, wherein the current position is calculated based on at least one of the received correction data relating to the current position. The navigation processing unit is configured to include a vehicle speed pulse communication unit that receives a vehicle speed pulse that is correction data related to a traveling distance, and calculates the current position using the vehicle speed pulse obtained from the vehicle speed pulse communication unit. A mobile phone having a navigation function according to claim 1 or 2. 4. The navigation device according to claim 1, wherein the navigation processing unit acquires a gyro signal as correction data relating to a traveling direction as the correction data, and calculates a current traveling direction using the gyro signal. A mobile phone having the navigation function according to claim 1. What is claimed is: 1. A navigation method using a mobile phone having a function of positioning and navigating a current position, wherein the mobile phone performs guidance of an absolute display, which is a display of guidance independent of a current traveling direction indicating a transition of a current position. The navigation method includes a step of displaying guidance, wherein the traveling guidance of the absolute display includes at least a name of a road and guidance of a traveling direction independent of the current traveling direction on the road. . A navigation method using a mobile phone having a function of positioning and navigating a current position, wherein the mobile phone retains a history of progress relating to transition of a current position, and calculates a current estimated position from the history of progress. Calculating, and including displaying an absolute display progress guide, which is a display of a guide independent of the current travel direction, wherein the absolute display progress guide is at least the current estimated position from the current estimated position. A navigation method comprising a traveling direction independent of the current traveling direction on a road constituting an intersection existing ahead of the traveling direction. A navigation method using a mobile phone having a function of positioning and navigating a current position, wherein the current position of the mobile phone is measured, and the current position of the mobile phone exists outside a range of a map obtained in advance. In the case, the method includes a step of presenting a simplified display, and the simplified display includes displaying a route that displays the route as a polygonal line based on the latitude and longitude of the route, displaying the current position, and displaying the scale. A navigation method comprising:

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