KR100517381B1 - mobile communication terminal capable of displaying azimuth and direction and method for displaying the same - Google Patents

Abstract

The present invention relates to a technology for providing a bearing indication service in addition to the current direction of movement using a mobile communication terminal equipped with a GPS receiver.

The mobile communication terminal according to the present invention calculates a moving direction from at least two position data measured at different times and displays it as visible information, and calculates an absolute direction from such a moving direction to obtain an absolute bearing at an angle relative to the moving direction. Can be displayed.

Accordingly, the mobile communication terminal according to the present invention can display the moving direction of the terminal user in the mobile communication terminal without additional hardware.

Description

Mobile communication terminal capable of displaying azimuth and direction and method for displaying the same {mobile communication terminal capable of displaying azimuth and direction and method for displaying the same}

The present invention relates to an additional function of a mobile communication terminal, and more particularly, to a technology for providing a service for a current movement direction and orientation by using a mobile communication terminal equipped with a GPS receiver.

GPS technology uses satellite data received from twenty-four orbits of carefully designed orbits to determine the three-dimensional position and accurate time of the handset. Satellite data transmitted from each GPS satellite includes a PRN code (Pseudo Random Noise Code) specially designed for each satellite number. The GPS receiver includes a high frequency circuit unit that converts the received high frequency signal into a low frequency signal that is easy to process, a signal processor which restores the spectrum spread signal from the signal processing unit to the original signal, a restored navigation message, and an observation message. (Code & Phase) Messag and microcomputer part that calculates the current position, speed, etc. according to the user's purpose from time measurement.

With the development of mobile communication technology, a technology for providing a location service by mounting a GPS modem in a personal mobile communication terminal has been realized. In the case of a personal digital assistant (PDA), a complete GPS receiver is included to provide location services on its own. On the other hand, the mobile phone does not have enough resources to handle the complicated calculation of the satellite's orbit, so the current service transmits the received satellite data to the server and displays the result calculated by the server on the terminal.

1 schematically shows the overall configuration of a location service system of such a current mobile communication terminal. The GPS phone 10 equipped with the GPS receiver receives satellite data from several GPS satellites 21, 22, and 23 and transmits the satellite data to the location service server 30 through wireless communication, for example, wireless Internet. . The location service server 30 calculates the coordinate data of the corresponding terminal from the received satellite data and returns it to the requesting terminal. The terminal receives this data and displays the current location on the screen.

2 schematically shows the configuration of such a mobile communication terminal according to the prior art. As shown, the mobile communication terminal includes a GPS receiver 300, a display unit 700, an operation unit 900 for selecting a menu and inputting an operation signal, and a communication unit for transmitting and receiving data with a location service server through a base station ( 500 and a controller 100 for transmitting satellite data received from the GPS receiver 300 through the communication unit 500 and outputting position data received through the communication unit to the display unit 700. do.

The GPS receiver 300 includes a high frequency circuit and a signal processing circuit, and is a known circuit that extracts satellite data from a wireless signal received from a satellite. The display unit 700 is a display device well known in a mobile communication terminal such as, for example, a liquid crystal display. The communication unit 500 is a communication circuit of a known mobile communication terminal for transmitting and receiving voice and data with a base station. Also, the operation unit 900 is well known user input means such as a key button or a touch fan. Detailed description thereof is omitted.

The control unit 100 is a microprocessor integrated in a single chip together with parts other than high frequency circuits of the communication unit 500 and the GPS receiver 300 in a commercially available mobile communication terminal. In the present specification, all the components of the control unit 100 are understood as a configuration for controlling the entire system in combination with the program codes stored in the memory.

The control unit 100 outputs the satellite data received from the satellite through the GPS receiver 300 to the communication unit 500, and outputs the position data received from the communication unit 500, and the position processing unit 120. The display control unit 160 generates display data from the data output by the control panel and outputs the generated display data to the display unit.

The conventional mobile communication terminal configured as described above can inform the user of the current location coordinates. The present inventors have come to the present invention while devising useful contents that can be practically helpful to the user as well as providing fragmentary location data.

On the other hand, in the case of navigation devices commercialized to be attached to a conventional vehicle, the installation position is fixed, it is possible to grasp the moving direction from the change of the GPS position coordinates and display it on the terminal. However, in the case of a mobile communication terminal, since the user carries the terminal, the direction that the terminal itself faces is not constant, so even if the mobile bearing is grasped, there is no standard for displaying the mobile bearing.

In order to solve this problem, it is conceivable to include a magneto-sensitive sensor in the terminal to sense the earth's magnetism and display the direction of movement along with the absolute orientation. The geomagnetic sensor is a device whose resistance value changes according to the magnetic field strength. Since the resistance value of the sensor varies according to the angle between the geomagnet having a certain size and direction and the sensor, the orientation can be determined using the geomagnetic sensor. However, there are the following problems in applying the geomagnetic sensor to a portable small terminal.

In other words, in order to know the orientation, a geomagnetic sensor having at least three axes should be used. This sensor is relatively large for small terminals such as mobile phones. In addition, in the case of the geomagnetic sensor, the measurement orientation may be incorrect when the sensor is not horizontal to the ground surface. In the case of a mobile communication terminal, the direction of the terminal may be directed to an arbitrary position while being portable, thereby causing a problem. In order to correct this problem, a geomagnetic sensor having five axes should be used. However, the five-axis sensor is too large to be applied to a small terminal.

On the other hand, in the case of geomagnetic sensor, there is a problem in detecting the magnetic north (磁 北) because the true north and magnetic north is different. In addition, there is a problem in the terminal that there is a device that generates a strong magnetic field affecting the geomagnetic sensor, for example, a speaker or a Hall sensor, so that accurate detection is difficult.

The present invention aims to solve such a problem, and aims to display a bearing and a direction without adding hardware to a current mobile communication terminal.

Furthermore, an object of the present invention is to enable the mobile communication terminal to display the opposite direction with respect to the moving direction and the reference point regardless of the direction in which the terminal is carried.

Furthermore, another object of the present invention is to enable the display of an absolute orientation in a mobile communication terminal whose direction is not constant when carrying.

A mobile communication terminal according to an aspect of the present invention for achieving the above object is characterized by calculating the direction of movement from at least two position data measured at different times to display as visible information. Accordingly, the mobile communication terminal according to the present invention can display the moving direction of the terminal user in the mobile communication terminal without additional hardware.

The mobile communication terminal according to another aspect of the present invention is characterized by calculating the relative direction between the two points from the registration point position data and the measured position data stored in the memory to display as visible information. Accordingly, the mobile communication terminal according to the present invention can service the direction of the current location from the point of interest of the user.

The mobile communication terminal according to another aspect of the present invention is characterized by calculating the moving distance and the moving direction between each point for at least one or more pairs of such registration points and displaying them as visible information. Accordingly, the mobile communication terminal according to the present invention can service the distance and direction between points of interest to the user.

The mobile communication terminal according to another aspect of the present invention is characterized by calculating the absolute orientation based on the heading direction and displaying the absolute orientation. Accordingly, the mobile communication terminal according to the present invention can determine the absolute orientation by using the mobile communication terminal whose direction is not constant when carrying.

According to another aspect of the present invention, a mobile communication terminal is characterized by rotating and displaying a display screen of the terminal in a clockwise or counterclockwise direction according to a user's operation signal. Accordingly, the mobile communication terminal according to the present invention can easily grasp the absolute orientation visually even in a mobile communication terminal whose direction is not constant when carrying.

The foregoing and further aspects of the present invention will become more apparent later through the preferred embodiments described with reference to the accompanying drawings. Hereinafter, the present invention will be described to such an extent that those skilled in the art can easily understand and reproduce the present invention.

3 is a block diagram schematically illustrating a configuration of a mobile communication terminal according to an embodiment of the present invention. Similar configurations corresponding to those of FIG. 2 are denoted by the same reference numerals. As shown, the mobile communication terminal includes a GPS receiver 300, a display unit 700, a communication unit 500 for transmitting and receiving data to and from a location service server through a base station, and an operation unit 900 for inputting a user's operation signal. And a controller 100. The GPS receiver 300, the display unit 700, the communication unit 500, and the operation unit 900 are similar to those of FIG. 2, and thus detailed descriptions thereof will be omitted.

The control unit 100 outputs the satellite data received from the satellite through the GPS receiver 300 to the communication unit 500 and the position processor 120 for outputting the position data received therefrom to the display control unit 160, The display controller 160 generates display data from the data and outputs the generated display data to the display unit 700. Since these configurations are similar to those in FIG. 2, detailed description thereof will be omitted.

According to a characteristic aspect of the present invention, the control unit 100 calculates a relative direction between the two points from the position data input from the position processing unit 120 or the position data of the registration point stored in the memory 200 to the display control unit 160. It includes a direction calculator 140 for outputting.

Furthermore, according to a characteristic aspect of the present invention, the direction calculating unit 140 calculates a moving direction from at least two position data measured at different times input from the position processing unit 120, and outputs the moving direction to the display control unit 160. The direction processor 142 is included.

The GPS signal has an error of several m to several tens of meters due to the error of the satellite itself, the characteristics of the medium present on the propagation path, the error according to the multipath, and the error of the receiver noise. Among these error factors, except for the error caused by the receiver noise, it is not a sudden change factor for a short time or a distance movement, so the measured data at the approximate position or time includes almost the same error. It is known that a DGPS method is used to correct satellite data measured in another region using GPS position error data of a reference station that knows the exact location using this fact. It is thereby possible to reduce the position error to within about 1 m.

Orientation detection according to the present invention is calculated using the difference between two or more locations measured in the mobile terminal and the distance traveled by the terminal for a limited time is negligible compared to the distance between the satellite and the terminal, so the two location data propagates It can be said that the same error condition with respect to the transmission medium of the. Therefore, the azimuth value calculated according to the characteristic aspect of the present invention can maintain a high degree of precision.

Hereinafter, the orientation calculation method of the movement direction processing unit 142 will be described in detail. The coordinate system used in GPS uses the international standard WGS84 coordinate system, which is usually converted back to the local coordinate system. The following formula is expressed based on the local coordinate system commonly used by users, and indicates latitude and longitude respectively. Altitude data is omitted because orientation is not required for bearing detection. A series of local coordinate values output from the location processing unit 120 of the terminal is expressed as follows.

P1 = (A1 + Ae1, B1 + Be1), P2 = (A2 + Ae2, B2 + Be2), P3 = (A3 + Ae3, B3 + Be3),...

Where An and Bn are the exact latitude / longitude values of unknown terminals, and Aen and Ben are the latitude / longitude error values of the terminals, respectively. Here, the difference vector between the two coordinate values can be calculated as follows assuming that the errors at the two points are almost the same.

D21 = P2-P1 = (A2-A1 + Ae2-Ae1, B2-B1 + Be2-Be1)

    ≒ (A2-A1, B2-B1)

If we convert the above equation into the difference of distance between two points, it is as follows.

L21 = (La × (A2-A1), Lb × (B2-B1)), where

La: The distance when latitude changes by 1 degree from latitude A1

Lb: Distance when the longitude changes by 1 degree in latitude A1

The angle from P1 to P2 relative to the north is as follows and the angle increases clockwise.

O21 = ArcTan (La × (B2-B1) / (Lb × (A2-A1)))

Table 1 shows the orientation or direction according to the latitude / longitude difference.

Sign of "A2-A1" Sign of "B2-B1" Value of O21 defense 0 0 "Pending" indication 0 + 90 ° 0 ° W 0 - -90 ° 0 ° E + 0 0 ° 0 ° N + + 0 ° to 90 ° Value between N and W + - 0 ° to -90 ° Value between N and E - 0 180 ° 0 ° S - + 90 ° ~ 180 ° Value between W and S - - -90 ° to -180 ° Value between E and S

TABLE 1

Table 2 shows the distance for latitude / longitude 1 degree by latitude.

Latitude (°) Length of 1 degree latitude (Km) Length of 1 degree of hardness (Km) Latitude (°) Length of 1 degree latitude (Km) Length of 1 degree of hardness (Km) 0 110.569 111.322 50 111.23 71.7 5 110.578 110.902 55 111.327 63.997 10 110.603 109.643 60 111.415 55.803 15 110.644 117.553 65 111.497 47.178 20 110.701 114.65 70 111.567 38.188 25 110.77 100.953 75 111.625 28.904 30 110.85 96.49 80 111.666 19.394 35 110.941 91.29 85 111.692 9.735 40 111.034 85.397 90 111.7 0 45 111.132 78.85

TABLE 2

Direction detection using GPS signals is possible only when the terminal with the GPS device moves. In the case of a portable terminal, the movement and stop state are repeated from time to time, but most of the users who want to use the direction detecting function assume that the user is moving.

In a preferred embodiment, the movement direction processing unit 142 calculates the direction in which the user moves based on the previous position. In other words, one location information of the past is stored and the orientation of the current location with respect to the point is calculated. As the current position is updated, the direction of movement can be continuously calculated by allowing the previous position to be continuously updated at a predetermined measurement interval. In addition, it is also possible to calculate and display the moving distance during the measurement time from the coordinate value. Furthermore, the moving speed can be calculated and displayed together.

4 shows a control flow in an embodiment of the movement direction processing unit 142 according to the present invention. As shown, the movement direction processor 142 first measures the GPS position and initializes the position variables Pb and P (steps 410 and 411). Afterwards, the GPS position is measured again (step 412) to calculate the distance and direction between the past point Pb and the current measurement position P (step 413). Thereafter, it is determined whether the measured distance value is larger than the reference value Ls (step 414). If the distance value is larger, the movement position is stored in Pb (step 415), and the calculated distance and direction are displayed (step 415). 416). At this time, the instantaneous movement distance or movement speed can be displayed as needed. The form of the display can be displayed as a combination of numbers and letters, for example, "15 ° north reference, 14m travel distance". The display control unit 160 processes the D value, the L value, and the speed value output from the position processing unit 120 into visible information. In addition, such information may be displayed as a compass-shaped video based on, for example, a direction of progress. If the travel distance value calculated in step 414 is less than the Ls value, it is determined that the vehicle is in a stop state and a message such as "stopping" is displayed without updating the position variable Pb or the previous moving direction is displayed. In this case, since the user is almost at rest, the displayed orientation may be inappropriate. However, since the two coordinate values maintain considerable precision, the calculated data may be displayed for reference.

The Ls value may be set to, for example, 1 m as a maximum distance for determining whether to stop. When the moving speed of the user is slow or stopped, the difference between the position coordinates that are continuously measured may be small, thereby increasing the bearing and distance errors. At this time, it is possible to prevent the error by setting the Ls value appropriately. Furthermore, the Ls value is related to the error range of the GPS receiver, so adjust it according to the performance of the receiver. This value is also assigned a default value but can be reset by the user.

On the other hand, when the user keeps a stationary state for a long time or moves at a very slow speed, more points need to be considered in calculating the moving direction. 5 shows a control flow in another embodiment of the movement direction calculation unit 142 according to the present invention that can be prepared for such a case.

As shown, in the previous embodiment, the coordinate values of one point in the past and the coordinate values of the current measurement position are the basis of the calculation, but in this embodiment, the coordinate values P1 and P0 of the two points in the past and the current measurement are used. The coordinate value P2 of the position becomes the basis of the calculation.

As shown, the movement direction processor 142 first measures the GPS position and initializes the position variables P0 and P1 (steps 510 and 511). Afterwards, the GPS position is measured again (step 512), and L21, which is the distance between the previous past point P1 and the current measurement position P2, and D21, which is the orientation of P2 relative to P1, are calculated. Further, L20, which is the distance between the previous past point P0 and the current measurement position P2, and D20, which is the orientation of P2 with respect to P0, are calculated (step 513).

 It is then determined whether the measured distance value L21 is greater than the reference value Ls (step 514). This determination is to determine if the vehicle has traveled enough distance to determine that it is not stationary. If greater, it is determined whether L20, the distance between the previous past point P0 and the current measurement position P2, is greater than Ld having another value greater than Ls as another reference value (step 515). In other words, it is determined whether or not the azimuth data has traveled a sufficient distance. If large, the value of P1 is P0, and the current position coordinate P2 is copied to P1 (step 516). Thereafter, L21, L20, and D21 and D20 are displayed.

Ls is a maximum distance for determining whether to stop, for example, has a value of 1m. Ld is the minimum distance for measuring azimuth and has a value of, for example, 5 m. That is, in this embodiment, it is determined that the azimuth measurement is meaningful only for the measured value when there is a shift of Ld or more during a longer time interval. In other words, it is determined in step 514 whether it is stationary, and if not, in step 515 it is determined whether the direction calculation is a meaningful valid calculation value.

If it is determined in step 515 that the direction calculation is not significant, only P2, which is the current measurement position, is copied to P1 and P0 is maintained. As a result, in the next calculation step, the previous position, P0, is not updated, that is, retains the previous measurement position value. Accordingly, the movement information may be determined based on the measured value at a further time.

If L21 is smaller than Ls in step 514, L20, which is a difference between measured values at more distant times, is compared with Ls. If large, the data of P0 is not updated but only P1 is updated to the current position (step 520), and then L20 and D20 are displayed. At this time, L21 and D21 display a message indicating that the vehicle is in a stopped state or stop, or display a value calculated by measuring distance and azimuth when stopping (step 521).

In the case of NO in step 519, since there is almost no movement even during a relatively long time, the data of P0 is not updated but only P1 is updated to the current position (step 522), and the moving distance or direction remains stopped. A message indicating that the vehicle is being stopped is displayed, or a value calculated by measuring distance and azimuth when the vehicle is continuously stopped is displayed (step 523). Thereafter it is checked from the user whether the end of the location and direction service is selected, otherwise go to step 512 to repeat the GPS data measurement and the direction and location indication again and if the end is selected, the process ends and returns to the main program ( Step 524).

In Embodiment 1, if the user continues to move at a very slow speed, the message " stopping " and an incorrect orientation may continue to be displayed. In Embodiment 2, since two pieces of information are simultaneously displayed according to the measured values at two time points, the user can make a more appropriate judgment.

According to a characteristic aspect of the present invention, the direction calculating unit 140 further includes a registration point direction processing unit 144. The registration point direction processing unit 144 calculates a relative direction between two points from the registration point location data stored in the memory 200 and the position data input from the location processing unit, and outputs the relative direction between the two points to the display control unit 160. The registration point direction processing unit 144 may further include a designated orientation processing unit 145 and a registration point editing unit 147 according to an auxiliary aspect.

The designated bearing processor 145 outputs the moving distance and the moving bearing between the respective points to the display controller 160 with respect to at least one pair of registered points. The registration point editing unit 147 sets and stores the registration point according to the operation signal of the user, or deletes the stored registration point. In one embodiment, the registration point editing unit 147 registers the position coordinates measured at the location as the registration point as the user sets the "registration point" at one point. In another embodiment, the registration point editing unit 147 presents a plurality of candidate points stored in association with the previously measured position coordinates to the user through the display unit 700, among which the user operates the operation unit 900. Set one or more points to select as a registration point and save it. Such a candidate point may be, for example, a subway station or a government office. Such a candidate point is stored in the location service server 30 and when the user selects the data in the online mode, only the selected registration point related data may be downloaded to the memory 200.

Hereinafter, the registration point direction processing unit 144 will be described in more detail.

In the registration point direction processing unit 144, the designated direction processing unit 145 calculates the distance and direction between the reference point and the target point. The registration point editing unit 147 sets or deletes a registration point, that is, a reference point and a target point. In one embodiment, the coordinates of the registration points are stored in the memory 200.

6 shows a control flow in one embodiment of the registration point direction processing unit 144 according to the present invention. First, the GPS position is measured and the current measurement position variable P is read (step 610). Next, it is checked whether there is a reference point among the stored registration points (step 611). If there is no reference point in step 611, the flow moves to the reference point storing step of step 615. The target point is set to the current position by default. If there is a reference point in step 611, the current position P is the target point Pt, and the distance and orientation between this point and the reference point Po are measured (step 612). The bearing and distance between the measured registration points are then displayed. This orientation becomes the direction of the target point seen from the reference point.

Next, check the mode. If the end of the designated bearing function is selected, the current routine is terminated and the program returns to the main program. If the designated azimuth function has not ended, go to step 610 where the next measured direction and distance between the current position and the reference point is measured. Accordingly, the distance and direction from the reference point to the current position are continuously displayed. If the registration point editing function is selected and the registration point editing unit 147 is called, the menu moves.

In one preferred embodiment, the menu includes the functions of steps 615 through 621. If the user selects to store the registration point, the registration point coordinates are stored as a list in a specific area of the memory 200 (step 615). The registration point may be one of the measured values measured by receiving the GPS signal, for example, the current position. In addition, the coordinates of arbitrary positions can be directly input and set. Such a registration point setting may be stored at any time while the user moves, or may be automatically set at regular intervals using a function of "storing an automatic registration point." The automatic registration point storage function sets the number of reference points and the time interval, and saves the GPS position coordinates measured as a fixed time interval as the number of registration points without a separate user command. After the registration point is set, go to step 610 to continue the position measurement.

When the user selects the reference point selection function, one or more of the registered points stored or inputted in the terminal are selected and stored as the reference point (step 616). If the user chooses to exit the menu, the process proceeds to step 610 previously performed and continues the position measurement. If the user selects the target point selection function, one or more of the registered points are selected and stored as the target points (step 618). If the target point is not set, it is set as the current position by default. Accordingly, the bearing and the distance from the fixed reference point to the current location which is continuously updated can be continuously displayed.

When the user selects the movement path tracking function, when there are several stored reference points, the movement distance and bearing between the reference points are sequentially displayed at once (step 619). Accordingly, the moving distance, bearing and moving trajectory for each section can be known. When the user selects the current location multi-measurement function, the current direction and distance for each reference point stored in the terminal are simultaneously displayed (step 620). Coordinates of a few features can be entered using the arbitrary registration point input function of step 615, and then the current location multi-measurement function can be performed on them to help identify their position on the map.

If the user selects to delete the registration point, one or more of the registration points stored in step 615 are selected and deleted (step 621).

According to a characteristic aspect of the present invention, the direction calculator 140 further includes an absolute bearing processor 146. The absolute orientation processing unit 146 calculates an absolute orientation based on the traveling direction and outputs the absolute orientation to the display control unit 160.

For example, it is assumed that the direction from the previous position to the current position is continuously calculated by the movement direction processing unit 142. The direction data calculated at this time indicates the direction of movement of the mobile phone holder in absolute orientation. From this, for example, the true north direction can be calculated relative to the moving direction. However, the absolute direction processing unit 146 according to the present invention is not limited to the direction of movement, and may be data according to the operation of the designated direction processing unit 145 for measuring a relative orientation with respect to a specific registration point within the visible range. That is, you can point the mobile phone to the reference point and know the true north direction from the relative position.

The data output from the position processor 120 and the direction calculator 140 is converted into display data by the display controller 160 and output to the display unit 700. The display data may be displayed as text data, for example, 15m, NE15 °, for the position and orientation. Furthermore, the display data may be displayed on a graphic screen similar to a compass. If the data calculated by the movement direction processing unit 142 or the data calculated by the designated direction processing unit 145 is output in the automatic update mode or the current location multi-measurement mode, etc., the compass is rotated accordingly. It can be displayed as a graphic video. Graphical techniques required for the implementation of the ideas taught in the present invention are well known to those skilled in the art, and thus detailed descriptions thereof will be omitted.

For example, the output data of the absolute orientation processing unit 146 may display the moving direction in the longitudinally forward direction of the mobile phone as shown in FIG. 7, and graphically display the true north direction at an angle relative thereto. Therefore, the user can know the true north direction by matching the direction of the mobile phone in the direction of movement, so the user can use the mobile phone as a compass. In this case, if the user changes direction while moving, the needle representing true north will rotate on the display screen according to the user's direction change.

According to a further aspect of the present invention, the display control unit 160 includes a display direction rotation processing unit 162. The display direction rotation processor 162 controls the entire display screen of the terminal to be rotated in a clockwise or counterclockwise direction and displayed according to a user's operation signal. For example, some users may find it inconvenient to always match their cell phone to the direction of travel. Or, when displayed on a map, there is a case where the direction of the mobile phone is appropriately changed depending on the display contents. In this case, the user can rotate the display screen clockwise or counterclockwise using, for example, an up-down key used to select a menu of the mobile phone. Given the idea according to the invention, it is well known to those skilled in the art to implement such a rotation technique of the graphic display screen, so the detailed description is omitted.

As described in detail above, the present invention calculates the moving direction of the terminal in the absolute direction through the position data measured at different time points or randomly input position data, and displays it on the screen so that the user can move his / her own direction without additional hardware. Of course, it is a useful invention that can know the absolute orientation.

Furthermore, according to the present invention, the orientation from any point can be known, which is useful for obtaining accurate geographic information in activities such as hiking and leisure.

In addition, according to the present invention, as the entire display screen is rotated and displayed at an arbitrary angle, even if the user rotates the mobile phone as desired, it is possible to display an appropriate moving direction and absolute orientation.

1 schematically shows the overall configuration of a location service system of a known mobile communication terminal.

2 schematically illustrates a configuration of a mobile communication terminal capable of location services according to the prior art.

3 is a block diagram schematically illustrating a configuration of a mobile communication terminal according to an embodiment of the present invention.

4 shows a control flow in an embodiment of the movement direction processing unit according to the present invention.

5 shows a control flow in another embodiment of the movement direction calculation unit according to the present invention.

6 shows a control flow in an embodiment of the registration point direction processing unit according to the present invention.

7 illustrates an embodiment of a screen displaying an absolute direction.

<Description of the symbols for the main parts of the drawings>

10: GPS phone 21,22,23: GPS satellite

30: Location Service Server

100 control unit 120 position processing unit

140: direction calculation unit 142: movement direction processing unit

144: registration point direction processing unit 145: designated orientation processing unit

146: absolute defense processing unit 147: registration point editing unit

160: display control unit 162: display direction rotation processing unit

200: memory 300: GPS receiver

500: communication unit 700: display unit

900: control panel

Claims (9)

A GPS receiver; A communication unit for transmitting and receiving data to and from the location service server through the base station; A position processing unit for outputting the position data received from the satellite through the GPS receiver to the communication unit and outputting the position data received from the communication unit to the display control unit; and a display control unit for generating display data from the input data and outputting the display data to the display unit. In the mobile communication terminal comprising a; The control unit: A moving direction processing unit for calculating a moving direction from at least two position data measured at different times input from the position processing unit and outputting the moving direction to the display control unit; And an absolute bearing processor configured to calculate a true north direction based on the moving direction, calculate a true north direction in a direction relative to the moving direction, and output the true north direction to the display controller. The display control unit: And a display direction rotation processor configured to control the display screen of the terminal to be rotated in a clockwise or counterclockwise direction according to a user manipulation signal. The method of claim 1, wherein the control unit: And a registration point direction processing unit for calculating a relative direction between the two points from the registration point location data stored in the memory and the position data input from the location processing unit and outputting the relative direction between the two points. The mobile communication terminal of claim 2, wherein the registration point direction processing unit further comprises a registration point editing unit configured to set and store a registration point according to a user's operation signal, or to delete the stored registration point. 4. The designation direction processing unit according to any one of claims 2 to 3, wherein the registration point direction processing unit outputs the movement distance and the moving direction between each point to the display control unit for at least one pair or more of the registration points. Mobile communication terminal comprising a. delete The mobile communication terminal according to claim 1 or 2, wherein the absolute direction processing unit outputs the movement direction and a relative true north direction relative to the movement direction as graphic data. delete Receiving location data at a GPS receiver; Transmitting the received data to a location service server and receiving location data; Calculating a moving direction using the position data previously received and stored or stored in a memory by the user and the received position data; Calculating an absolute bearing in the reference direction based on the current moving direction and displaying the calculated moving bearing together with the calculated moving bearing; And rotating and displaying the screen display of the terminal in a clockwise or counterclockwise direction according to a user's operation input. delete