KR20190059543A - Walking navigation method - Google Patents

Abstract

A walking navigation method capable of reducing power consumption by minimizing the use of GPS is disclosed. The walking navigation method is related to a method performed by a user terminal, comprising the steps of: determining the current position using GPS; extracting target map information using the measured current position; acquiring position information of intersection points, distance information between intersections, and azimuth angle information using the target map information; determining whether the user terminal is moving using an acceleration sensor; calculating a moving state value indicating a moving state when the GPS operates, and an error covariance indicating whether the moving state value is stable, when it is determined that the user terminal moves; determining whether the error covariance exceeds an error reference value indicating a maximum value of the stable moving state; performing the calculation step again when the GPS operates, when it is determined that the error covariance exceeds the error reference value; stopping an operation of the GPS when it is determined that the error covariance is equal to or less than the error reference value; and, determining a current position after stopping the operation of the GPS. In this manner, the current position can be calculated by stopping the operation of the GPS when the user terminal is in the stable moving state, thereby minimizing power consumption.

Description

Walking Navigation Method {WALKING NAVIGATION METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking navigation method, and more particularly, to a walking navigation method capable of guiding a user's position on a walk using a GPS (Global Positioning System).

A user terminal such as a smart phone or a tablet PC can perform various functions such as an Internet search function, a message transmission function, a movie viewing function, and a music listening function in addition to a simple call function. In particular, the user terminal can perform various functions according to which application program is installed. For example, when a user terminal has installed a navigation program, the user terminal can perform a navigation function for indicating the location of the user. Such a navigation function is generally mounted on a vehicle to indicate the position of the vehicle, but recently it can be informed of the position of the user even when attached to a bicycle or on foot.

In order for the user terminal to perform the navigation function, the current position must be accurately measured. In general, a user terminal can measure a current location using a GPS (Global Positioning System), a cell tower, and WiFi access points. Among the above methods, there are many problems in using the cell tower or WiFi access points because of the large error in navigation, especially in the case of walking navigation. On the other hand, among the above methods, the method using GPS can relatively accurately measure the current position. However, since the GPS reception operation is about 20 times larger than the acceleration sensor measurement operation, the method using the GPS, which must perform the GPS reception operation by receiving the GPS signal in a short period, consumes much power .

Therefore, when the user terminal performs the navigation function using the GPS, a method of minimizing the power consumption is required. For example, it extracts turn-by-turn information of a route corresponding to a destination, performs only voice guidance in the case of a route straight from the TBT point, and performs voice guidance and screen guidance The power consumption according to the navigation function can be reduced. However, this power saving method is a method according to whether to perform only voice guidance or voice guidance and screen guidance. Basically, it is difficult to consider a power saving method because it requires to receive GPS signal in a short period.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and it is an object of the present invention to provide a walking navigation method capable of minimizing the use of GPS to reduce power consumption.

A walking navigation method according to an embodiment of the present invention relates to a method performed by a user terminal, comprising the steps of: measuring a current position using a GPS (Global Positioning System); (Hereinafter referred to as " target map information extracting step "), a step of extracting target map information including the target map information and the intersection points, (Hereinafter, referred to as " intersection information acquisition step "); and determining whether the user terminal is moving using the acceleration sensor after the intersection information acquisition step 1 " movement state determination step ") and, when it is determined that the user terminal is moving as a result of the first movement state determination step, (Hereinafter referred to as a " calculation step at the time of GPS operation ") and a step of calculating an error covariance at the time of the GPS operation Determining whether the error covariance exceeds an error reference value indicating a maximum value of a stable movement state (hereinafter, referred to as a 'stable movement determination step'); and a step of determining whether the error covariance Performing a calculation step of the GPS operation again if it is determined that the error covariance is greater than the error reference value; and stopping the operation of the GPS when the error covariance is less than the error reference value as a result of the stable movement determination step Determining a current position after stopping the operation of the GPS (hereinafter, referred to as a 'current positioning step' ) A.

In the target map information extracting step, in the map information database, the target map information including information about an area within a reference range around the measured current position can be extracted.

In the target map information extracting step, the target map information can be extracted after accessing the map information server storing the map information database.

The step of acquiring the intersection information may include extracting position information of the intersections using the target map information, calculating distance information between the intersections using the position information of the intersections, And calculating azimuth information between the intersections using the azimuth angle information.

The first movement state determination step may include a step of measuring a plurality of acceleration sensing values using the acceleration sensor, a step of calculating a standard deviation of measured acceleration sensing values, a step of calculating a standard deviation of the acceleration sensing values And determining whether the user terminal is moving.

The step of determining whether the user terminal is moving may determine that the user terminal is moving when the standard deviation of the calculated acceleration sensing values is equal to or greater than the deviation reference value.

The calculating step in the GPS operation includes calculating a moving speed (hereinafter, referred to as 'GPS moving speed') when the GPS is operating, the moving state value and the error covariance, (Hereinafter, referred to as " GPS operation cumulative number of steps ").

Calculating the GPS movement speed, the movement state value, and the error covariance may include: remeasuring the current position using the GPS; and determining the GPS movement speed, Value and the error covariance.

The step of calculating the GPS operation cumulative number of steps includes the steps of measuring at least one acceleration sensing value using the acceleration sensor and calculating the number of cumulative steps of the GPS operation using the z axis component of the measured acceleration sensing value Step < / RTI >

The current location determination step may include determining a current location of the GPS when the operation is stopped.

In the calculation step in the GPS operation, the movement speed (hereinafter, referred to as 'GPS movement speed') when the GPS is operating can be calculated together with the movement state value.

The present positioning step may further include calculating a scheduled arrival time at a target intersection point to arrive from the determined current position and the GPS operation moving speed (hereinafter referred to as " estimated arrival time calculating step ") .

Wherein the step of calculating the estimated arrival time comprises the steps of: determining a target sidewalk, which is a sidewalk closest to the determined current position among the sidewalks; measuring a current traveling direction angle using the azimuth sensor; Determining the target intersection among the intersections, and calculating the expected arrival time using the GPS operation moving speed.

The present positioning step may include a step of determining whether the user terminal is moving using the acceleration sensor (hereinafter referred to as a 'second moving state determining step') after the estimated arrival time, Determining whether the current time is the expected arrival time (hereinafter referred to as a scheduled time determination step) if the mobile terminal determines that the user terminal is moving as a result of the movement state determination step, The method of claim 1, further comprising: performing the second movement state determination step again when it is determined that the current time is before the estimated arrival time; and if the current time is the expected arrival time or after, Performing the predetermined time calculation step again; and determining, as a result of the second movement state determination step, that the user terminal is moving When judged that may include (hereinafter referred to as "updating the current phase position ") comprising: re-determining the current position and the step of updating the current position after step, performing the expected arrival time calculation step.

In the calculation step in the GPS operation, the number of cumulative steps when the GPS is operating (hereinafter, referred to as 'cumulative number of GPS operation steps') can be calculated together with the moving state value and the GPS operation moving speed .

The current location determination step may further include calculating a cumulative number of steps (hereinafter, referred to as 'GPS stop cumulative number of steps') when the operation of the GPS is stopped.

The step of calculating the GPS stop cumulative number of steps may be performed as a result of the second movement state determination step, after determining that the user terminal is moving, and before the predetermined time determination step is performed.

The current location determination step may further include calculating an average stride using the GPS operation moving speed and the GPS operation cumulative number of steps.

The current position updating step may further include calculating and determining a current position using the average stride, the GPS stopping cumulative number of steps, and the traveling direction angle.

The present position updating step may include calculating a current position and determining whether the user terminal is moving using the acceleration sensor (hereinafter, referred to as a 'third moving state determining step'), Determining whether the user terminal is moving by measuring the current position by operating the GPS, determining the current position again, and then stopping the operation of the GPS . ≪ / RTI >

As described above, according to the walking navigation method of the present invention, when the user terminal is not in a stable moving state, it measures a current position by operating a GPS (Global Positioning System), and stops the operation of the GPS And calculating the current position according to the stable movement, power consumption according to the operation of the GPS can be minimized.

FIG. 1 is a conceptual diagram for explaining a walking navigation method according to an embodiment of the present invention.
2 is a flowchart showing the walk navigation method of FIG.
FIG. 3 is a view showing an example in which target map information is extracted from the walking navigation method of FIG.
FIG. 4 is a flowchart illustrating in detail the process of acquiring intersection information among the walking navigation methods of FIG.
5 is a view showing an example of extracting sidewalks and intersections in the intersection information obtaining method of FIG.
FIG. 6 is a view showing an example of extracting position information of intersections in the method of obtaining intersection information of FIG. 4. FIG.
FIG. 7 is a diagram illustrating an example of calculating distance information (unit: km) between intersections in the intersection information obtaining method of FIG.
FIG. 8 is a diagram illustrating an example of calculating distance information (unit: latitude 1 degree) between intersections in the intersection information obtaining method of FIG.
FIG. 9 is a view showing an example of calculating azimuth information (unit: latitude 1 degree) between intersections in the method of acquiring the intersection information of FIG.
FIG. 10 is a flowchart illustrating a method for determining whether a user terminal is moving in the walk navigation method of FIG. 2. Referring to FIG.
FIG. 11 is a flowchart illustrating a detailed calculation process in the GPS operation among the walking navigation methods of FIG. 2. FIG.
FIG. 12 is a flowchart illustrating in detail the process of calculating the GPS movement speed and the movement state value during the calculation process in the GPS operation of FIG.
FIG. 13 is a flowchart showing in detail a process of calculating the cumulative number of GPS operation steps in the calculation process in the GPS operation of FIG.
FIG. 14 is a flowchart showing details of the current positioning process among the walking navigation methods of FIG.
FIG. 15 is a flowchart illustrating details of the estimated arrival time during the current positioning process of FIG.
FIG. 16 is a flowchart illustrating in detail the process of determining the current position again during the current positioning process of FIG.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text.

It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms " comprising " or " having ", and the like, are intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

FIG. 1 is a conceptual diagram for explaining a walking navigation method according to an embodiment of the present invention, and FIG. 2 is a flowchart illustrating a walking navigation method of FIG.

Referring to FIGS. 1 and 2, a walking navigation method according to an embodiment of the present invention allows a user terminal 10 such as a smart phone, a tablet PC, and the like to execute a walking navigation program for guiding the user's walking S100). That is, the user terminal 10 may execute the walking navigation program and access the navigation server 20 to receive the walking navigation service. Meanwhile, the user terminal 10 may access the navigation server 20 or another download server to download the walking navigation program before step S100.

Then, the user terminal 10 can measure the current position using a GPS (Global Positioning System) (S200). That is, the user terminal 10 can operate the GPS to receive the GPS signal and measure the current position.

FIG. 3 is a view showing an example in which target map information is extracted from the walking navigation method of FIG.

Referring to FIGS. 1 to 3, the user terminal 10 may extract target map information including a plurality of sidewalks and intersections using the current position measured in step S200 (S300). For example, after the user terminal 10 accesses the map information server 30 storing the map information database, for example, a Naver map server, a next map server, a Google map server, The target map information can be extracted as shown in FIG. At this time, the target map information is information extracted from the map information database, and may include information about an area within a reference range, for example, 500 m, centered on the current position measured in step S200. The map information database is not stored in the map information server 30 but may be stored in the navigation server 20 or in the internal memory of the user terminal 10. [

FIG. 4 is a flowchart illustrating in detail the process of acquiring intersection information in the walk navigation method of FIG. 2. FIG. 5 is a view illustrating an example of extracting walkways and intersections from the intersection information acquisition method of FIG. FIG. 7 is a diagram illustrating an example of calculating distance information (unit: km) between intersections in the intersection information obtaining method of FIG. 4; and FIG. FIG. 8 is a view showing an example of calculating distance information (unit: latitude 1 degree) between intersections in the intersection information obtaining method of FIG. 4. FIG. 9 is a diagram illustrating an example of calculating azimuth information (Unit: latitude 1 degree).

Referring to FIGS. 2 and 4 to 9, after the target map information is extracted, the user terminal 10 calculates the position information of the intersections, the distance information between the intersections, The azimuth information between the intersections can be obtained (S400).

In operation S400, the user terminal 10 may extract location information of the intersections using the target map information (S410). For example, after the user terminal 10 extracts information about the walkways and information about the intersections from the target map information as shown in FIG. 5, the location information of the intersections, for example, coordinates The value can be extracted.

In operation S420, the user terminal 10 may calculate distance information between the intersections using the location information of the intersections extracted in operation S410. The distance information between the intersections may be represented by a matrix as shown in FIG. 7 or FIG. In this case, the general term M [i, j] can represent the distance between the intersection i and the intersection j in kilometer units or latitude units. On the other hand, when converting into the latitude unit as shown in FIG. 8, it may be calculated after converting the longitude to the latitude by using the value of the distance of 1 degree of latitude / 1 degree of latitude.

In addition, the user terminal 10 may calculate the azimuth information between the intersections using the location information of the intersections extracted in step S410 (S430). Here, the azimuth information between the intersections may be represented by a matrix as shown in FIG. In this case, the general term N [i, j] can represent the azimuth angle between the intersection i and the intersection j in degrees.

FIG. 10 is a flowchart illustrating a method for determining whether a user terminal is moving in the walk navigation method of FIG. 2. Referring to FIG.

Referring to FIGS. 2 and 10, after the intersection information acquisition process (S400) is performed, the user terminal 10 may determine whether the user terminal 10 is moving using the acceleration sensor S500).

In operation S500, the user terminal 10 may measure a plurality of acceleration sensing values during a reference time for determining a moving state using the acceleration sensor in operation S510.

Then, the user terminal 10 may calculate the standard deviation of the acceleration sensing values measured in operation S510 (S520).

In operation S530, the user terminal 10 may determine whether the user terminal 10 is moving using the standard deviation of the acceleration sensing values calculated in operation S520. For example, the user terminal 10 may determine that the user terminal 10 is moving when the standard deviation of the acceleration sensing values calculated in step S520 is equal to or greater than the deviation reference value, It is possible to determine that the user terminal 10 is not moving when the standard deviation of the acceleration sensing values is less than the deviation reference value. Here, the absence of the user terminal 10 may refer to a case where the user terminal 10 is stopped, the user terminal 10 performs very little or is not in a normal movement state. For example, the user terminal 10 may be placed on a desk, or the user may be sitting or standing, conversing or observing.

If it is determined in step S530 that the user terminal 10 is not moving, the user terminal 10 may repeatedly perform the first moving state determination operation S500.

FIG. 11 is a flow chart showing in detail the calculation process in the GPS operation among the walk navigation methods of FIG. 2, FIG. 12 is a flowchart illustrating the GPS movement speed, the movement state value and the error covariance FIG. 13 is a flowchart illustrating in detail a process of calculating the cumulative number of GPS operation steps in the calculation process in the GPS operation of FIG.

Referring to FIG. 2 and FIG. 11 to FIG. 13, when it is determined in step S530 that the user terminal 10 is moving, the user terminal 10 determines the moving speed (Hereinafter referred to as " GPS operation movement speed "), a movement state value indicating a movement state when the GPS is operating, an error covariance indicating whether the movement state value is stable, and a cumulative number of steps (Hereinafter, referred to as " GPS operation accumulation step number ") (S600).

The calculation step S600 of the GPS operation includes a step S610 of calculating the GPS movement speed, the movement state value and the error covariance by the user terminal 10, (S620).

First, in step S610, the user terminal 10 can re-measure the current position using the GPS (S612), and then, after the GPS operation, The user terminal 10 may calculate the GPS movement speed, the movement state value, and the error covariance using the current position re-measured in step S612 (S614). For example, the step S614 may be a My-Kalman-Filter-Process. Here, the movement state value may be a value calculated using a series of GPS measurements periodically collected when the GPS is operating, and may be a numerical value indicating the movement state of the user terminal 10, The covariance may be a numerical value indicating how stable the movement state value is.

In step S620, the user terminal 10 may measure at least one acceleration sensing value using the acceleration sensor (S622). Then, the acceleration sensor The GPS operation cumulative number of steps can be calculated using the z-axis component of the value (S624).

After the calculation process (S600) in the GPS operation is performed, the user terminal 10 may determine whether the error covariance exceeds an error reference value indicating a maximum value of a stable movement state (S700).

If it is determined in step S700 that the error covariance exceeds the error reference value and the user terminal 10 is not in a stable moving state, the user terminal 10 performs step S500 and step S600 Step S600 may be performed again, and otherwise, step S600 may be performed. That is, as long as the movement is not stopped, the user terminal 10 continuously measures the GPS movement speed, the movement state value, and the error covariance by remeasureing the current position every second using the GPS, At the same time, the acceleration sensing value is continuously measured to increase the cumulative number of GPS operation steps.

On the other hand, if it is determined in step S700 that the error covariance is less than the error reference value and the user terminal 10 is in a stable moving state, (S800).

FIG. 14 is a flowchart showing details of the current positioning process among the walking navigation methods of FIG. 2, FIG. 15 is a flowchart illustrating details of the estimated arrival time during the current positioning process of FIG. 14, 14 is a flow chart showing details of the process of determining the current position again during the current positioning process.

Referring to FIGS. 2 and 14 to 16, after the operation of the GPS is stopped, the user terminal 10 can determine the current position (S900).

In operation S900, the user terminal 10 may calculate an average stride using the GPS operation moving speed and the GPS operation cumulative number of steps (S910).

In addition, the user terminal 10 may determine the current position at which the operation of the GPS is stopped (S920).

After the current position is determined in step S920, the user terminal 10 may calculate the estimated arrival time to the target intersection to be arrived at in step S930 using the current position determined in step S920 and the GPS operation moving speed.

For example, when the user terminal 10 receives a report that is closest to the current position determined in step S920 of the reports included in the target map information, (S932). Then, the user terminal 10 can measure the current traveling direction angle using the azimuth sensor (S934), and then determine the target intersection point among the intersections using the traveling direction angle ( S936). For example, the user terminal 10 may determine the closest intersection point as the target intersection point using the target sidewalk or the heading angle. Then, the user terminal 10 can calculate the expected arrival time using the GPS operation moving speed (S938).

After calculating the expected arrival time, the user terminal 10 may determine whether the user terminal 10 is moving using the acceleration sensor (S940). The second movement state determination process (S940) may be substantially the same as the first movement state determination process (S500).

If it is determined in step S940 that the user terminal 10 is moving, the number of accumulated steps (hereinafter, referred to as 'GPS') when the user terminal 10 stops the operation of the GPS (Step S950). ≪ / RTI >

After the GPS stoppage step count is calculated, the user terminal 10 may determine whether the current time is the expected arrival time (S960).

If it is determined that the current time is earlier than the expected arrival time as a result of the scheduled time determination process (S960), the user terminal 10 may perform the second movement state determination process (S940) again. On the other hand, if it is determined that the current time is the expected arrival time or later as a result of the scheduled time determination process (S960), the user terminal 10 can perform the estimated arrival time calculation process (S930) again.

On the other hand, if it is determined that the user terminal 10 is not moving as a result of the second movement state determination process (S940), the current location can be determined again (S970).

In step S970, the user terminal 10 may calculate and determine the current location using the average stride, the GPS stopping cumulative number of steps, and the travel direction angle at step S972. That is, even if the operation of the GPS is stopped, the user terminal 10 calculates the travel distance using the average stride and the GPS stationary cumulative number of steps, and then calculates the travel distance using the calculated travel distance and the travel direction angle The current position can be calculated and determined.

After the current position is calculated and determined in step S972, the user terminal 10 can determine whether the user terminal 10 is moving using the acceleration sensor (S974). The third movement state determination process S974 may be substantially the same as the first movement state determination process S500.

If it is determined that the user terminal 10 is moving as a result of the third movement state determination process (S974), the user terminal 10 may operate the GPS and measure and determine the current position again (S976) . As described above, by determining and determining the current position again using the GPS, a more accurate current position can be determined.

After the current position is measured again in step S976, the user terminal 10 can stop the operation of the GPS (S978).

After the operation of the GPS is stopped in step S978, the user terminal 10 may perform the estimated arrival time calculation step S930 again.

According to the present embodiment, when the user terminal 10 determines that the user terminal 10 is not in a stable moving state, it measures the current position by operating the GPS, and when determining that the user terminal 10 is in the stable moving state, And calculating the current position according to the stable movement, power consumption according to the operation of the GPS can be minimized.

While the present invention has been described in connection with what is presently considered to be practical and exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: user terminal 20: navigation server
30: Map information server

Claims (20)

A method of walking navigation performed by a user terminal,
Measuring a current position using a GPS (Global Positioning System);
Extracting target map information including a plurality of sidewalks and intersections using the measured current position (hereinafter referred to as 'target map information extracting step');
Acquiring position information of the intersections, distance information between the intersections, and azimuth information between the intersections using the target map information (hereinafter referred to as 'intersection information acquisition step');
Determining whether the user terminal is moving using the acceleration sensor (hereinafter, referred to as 'first movement state determination step') after the intersection information acquisition step;
Calculating a movement state value indicating a movement state when the GPS is operating and an error covariance indicating whether the movement state value is stable when it is determined that the user terminal is moving as a result of the first movement state determination step (Hereinafter referred to as " calculation step in GPS operation ");
Determining whether the error covariance exceeds an error reference value indicating a maximum value of a stable movement state (hereinafter, referred to as a 'stable movement determination step');
Performing a calculation step in the GPS operation again if it is determined that the error covariance exceeds the error reference value as a result of the stable movement determination step;
Stopping operation of the GPS when the error covariance is less than the error reference value as a result of the stable movement determination step; And
And determining a current position after stopping the operation of the GPS (hereinafter, referred to as a 'current positioning step'). The method according to claim 1,
In the target map information extracting step,
Wherein the target map information is extracted from the map information database, the target map information including information about an area within a reference range centered on the measured current position. 3. The method of claim 2,
In the target map information extracting step,
And the target map information is extracted after accessing the map information server storing the map information database. The method according to claim 1,
The intersection information obtaining step
Extracting position information of the intersection points using the target map information;
Calculating distance information between the intersections using position information of the intersections; And
And calculating azimuth information between the intersections using the location information of the intersections. The method according to claim 1,
The first movement state determination step
Measuring a plurality of acceleration sensing values using the acceleration sensor;
Calculating a standard deviation of the measured acceleration sensing values; And
And determining whether the user terminal is moving using the standard deviation of the calculated acceleration sensing values. 6. The method of claim 5,
In the step of determining whether the user terminal is moving,
And determines that the user terminal is moving when the standard deviation of the calculated acceleration sensing values is equal to or greater than the deviation reference value. The method according to claim 1,
The calculation step in the GPS operation
Calculating a moving speed (hereinafter, referred to as 'GPS moving speed'), the moving state value and the error covariance when the GPS is operating; And
Calculating a cumulative number of steps when the GPS is operating (hereinafter, referred to as " GPS operation cumulative number of steps "). 8. The method of claim 7,
The step of calculating the GPS movement speed, the movement state value and the error covariance
Re-measuring the current position using the GPS; And
And calculating the GPS movement speed, the movement state value and the error covariance using the re-measured current position. 8. The method of claim 7,
The step of calculating the GPS operation accumulation step number
Measuring at least one acceleration sensing value using the acceleration sensor; And
And calculating the GPS operation cumulative number of steps using the z-axis component of the measured acceleration sensing value. The method according to claim 1,
The current positioning step
And determining a current position of the GPS when the operation is stopped. 11. The method of claim 10,
In the calculation step in the GPS operation,
(Hereinafter, referred to as " GPS movement speed ") when the GPS is operating, together with the movement state value. 12. The method of claim 11,
The current positioning step
Further comprising the step of calculating an expected arrival time at a target intersection to be arrived at in the future using the determined current position and the GPS operation moving speed (hereinafter referred to as " expected arrival time calculation step "). 13. The method of claim 12,
The estimated arrival time calculating step
Determining a target coverage, the coverage being closest to the determined current location of the reports;
Measuring a current traveling direction angle using an azimuth sensor;
Determining the target intersection among the intersections using the direction of travel direction; And
And calculating the expected arrival time using the GPS operation moving speed. 13. The method of claim 12,
The current positioning step
Determining whether the user terminal is moving using the acceleration sensor (hereinafter, referred to as 'second movement state determination step');
Determining whether the current time is the expected arrival time (hereinafter, referred to as scheduled time determination step) if it is determined that the user terminal is moving as a result of the second movement state determination step;
Performing the second movement state determination step again when it is determined that the current time is before the expected arrival time as a result of the predetermined time determination step;
Performing the estimated arrival time calculation step again if it is determined that the current time is the expected arrival time or later as a result of the scheduled time determination step;
Determining whether the user terminal is not moving as a result of the second movement state determination step (hereinafter, referred to as 'current location update step');
Performing the step of calculating the estimated time of arrival after the current location update step. 15. The method of claim 14,
In the calculation step in the GPS operation,
(Hereinafter, referred to as " GPS operation cumulative number of steps ") when the GPS is operating together with the moving state value and the GPS operation moving speed. 16. The method of claim 15,
The current positioning step
Further comprising the step of calculating a cumulative number of steps when the operation of the GPS is stopped (hereinafter, referred to as 'GPS stop cumulative number of steps'). 17. The method of claim 16,
The step of calculating the GPS stop cumulative number of steps
Wherein the step of determining the second moving state is performed after determining that the user terminal is moving and before the step of determining the scheduled time. 17. The method of claim 16,
The current positioning step
Further comprising calculating an average stride using the GPS operation moving speed and the GPS operation cumulative number of steps. 19. The method of claim 18,
The current location update step
Further comprising the step of calculating and determining a current position using the average stride, the cumulative number of GPS stops, and the traveling direction angle. 20. The method of claim 19,
The current location update step
Determining a current position and determining whether the user terminal is moving using the acceleration sensor (hereinafter, referred to as a 'third movement state determination step');
Determining whether the user terminal is moving by operating the GPS and measuring the current position again as a result of the third movement state determination step; And
And stopping the operation of the GPS after the current position is determined by measuring again.

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