KR20060120909A - Method and device for improving performance of car navigation by using mobile station with global positioning system - Google Patents

Abstract

A navigation device and method with improved car navigation performance using a GPS(Global Positioning System) terminal are provided to correct an error in the car position information of a car navigation system that is a main receiving unit, by receiving the car position information from a GPS mobile communication terminal that is a sub receiving unit. A navigation device with improved car navigation performance by connecting a car navigation system(100) and a mobile communication terminal equipped with a GPS receiving unit(130) through a USB(Universal Serial Bus) cable includes a GPS mobile communication terminal(110) communicating with the car navigation system, extracting GPS information received from a GPS satellite if a GPS information request signal is received according to a control command of the car navigation system, and transmitting the information to the car navigation system; the car navigation system connected with the GPS mobile communication terminal to generate and transmit a GPS information request signal to the GPS mobile communication terminal, receive the GPS information, and then exchange the own GPS information for the GPS information transmitted from the GPS mobile communication terminal; and an intermediate unit transmitting or receiving the GPS information between the GPS mobile communication terminal and the car navigation system.

Description

Navigation device and method for improving car navigation performance using GPS terminal {Method and Device for Improving Performance of Car Navigation by Using Mobile Station with Global Positioning System}

1 is a block diagram illustrating a schematic configuration of a navigation device for connecting a vehicle navigation system and a GPS mobile communication terminal equipped with a GPS receiver through a USB cable to improve car navigation performance;

FIG. 2 is a flowchart illustrating a method of improving car navigation performance by connecting a GPS mobile communication terminal equipped with a vehicle navigation system and a GPS receiver through a USB cable.

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

100: vehicle navigation system 110: GPS mobile communication terminal

120: vehicle GPS antenna 130: GPS receiver

140: program memory 150: buffer memory

160: path error detection unit 170: vehicle reception signal measurement unit

180: vehicle control unit 190: key input unit

192: display unit 194: voice processing unit

A navigation device and method for improving car navigation performance using a GPS terminal. More specifically, it is a navigation device that connects a GPS mobile communication terminal equipped with a vehicle navigation system and a GPS receiver through a USB cable, and receives GPS information from a vehicle navigation system as a main receiver to extract vehicle location information. To improve the car navigation performance using the GPS terminal that corrects the error data generated by receiving the location information of the vehicle from the GPS mobile communication terminal which is the secondary receiver when an error occurs in the vehicle location information due to an error in the main receiver. A navigation device and a method thereof are provided.

In general, vehicle navigation systems receive radio waves from satellites to determine the current location of the vehicle, display the location on a built-in digital map, and display the shortest path from the current location to the desired point of destination. It is a driving guidance device.

Such a navigation service is being implemented and utilized on a mobile communication terminal using a wireless network according to the rapid development of computer, electronic and communication technology. In other words, the navigation service using a mobile communication terminal is a GPS kit including a mobile communication terminal equipped with a wireless internet platform for interoperability (WIPI), a navigation kit, a terminal holder, and a GPS (Global Positioning System) antenna. It provides a road guidance service using the speaker and the LCD screen of the mobile communication terminal, the GPS kit receives the navigation data through the GPS receiver to store the road information in the flash memory (Flash Memory) to the mobile communication terminal Will be provided.

In addition, a product installed in a mobile communication terminal has also been released a product that can provide a navigation service using only a mobile communication terminal without a separate GPS kit.

As such, the mobile telematics market that provides traffic information such as road guidance and surrounding geographic information by using a mobile communication terminal is inducing fierce competition for wireless network operators.

However, when a mobile communication terminal provides a navigation service, errors in navigation performance may occur due to various factors, such as a shadow area, a base station installation environment, and a decrease in reception sensitivity of an antenna.

Therefore, in order to solve this problem a little, instead of the GPS antenna of the mobile communication terminal, a vehicle GPS antenna having a good reception performance is replaced and connected to the mobile communication terminal, thereby improving the performance and navigation accuracy of the device 10-2004-0061642. Korean public patents.

However, the above-described vehicle navigation system, a navigation system using a GPS terminal, and a system providing a navigation service by combining a vehicle GPS antenna with a mobile communication terminal operate by receiving GPS signals using only one GPS receiver to obtain coordinate data. . Therefore, in the prior art having such a configuration, when an abnormality or an error occurs in the GPS receiver, the navigation performance becomes weak, and thus there is a problem that an information error about the location information or the moving direction occurs.

In order to solve this problem, the present invention is a navigation device that connects a vehicle navigation system and a GPS mobile communication terminal equipped with a GPS receiver via a USB cable, and receives GPS information from a vehicle navigation system as a main receiver. And a method for extracting location information of a vehicle and correcting the error data generated by receiving location information of a vehicle from a GPS mobile communication terminal, which is a secondary receiver, when error occurs in the location information of the vehicle due to an error in the main receiver. The purpose is to provide.

Another object of the present invention is to compare the received signal strength of the GPS signal measured in the vehicle navigation system and the GPS mobile communication terminal, respectively, and receive the reception pattern from time to time to receive GPS information based on the GPS antenna having the greater strength of the received signal strength. It is an object of the present invention to provide a navigation device and a method for changing the same.

In order to achieve the above object, the present invention provides a navigation device that improves car navigation performance by connecting a mobile communication terminal equipped with a vehicle navigation system and a GPS (Global Positioning System) receiver through a USB cable. A GPS mobile communication terminal which communicates with a system and extracts GPS information received from a GPS satellite and transmits the received GPS information to the vehicle navigation system when receiving a GPS information request signal according to a control command of the vehicle navigation system; The GPS, which is connected to the GPS mobile communication terminal, generates the GPS information request signal, transmits the GPS information request signal to the GPS mobile communication terminal, receives the GPS information in response thereto, and receives its GPS information from the GPS mobile communication terminal. A vehicle navigation system replacing information; And an intermediate intermediary means for transmitting and receiving the GPS information between the GPS mobile communication terminal and the vehicle navigation system.

According to another object of the present invention, a method for improving car navigation performance by connecting a vehicle navigation system and a GPS mobile communication terminal equipped with a GPS receiver through a USB cable, (a) the vehicle navigation system Periodically positioning the vehicle location information at the to determine whether error data of the vehicle location information is generated; (b) if it is determined in step (a) that the error data of the vehicle location information is occurring, a GPS information request signal is generated and transmitted to the GPS mobile communication terminal, and from the GPS information received from the GPS mobile communication terminal Extracting and generating terminal location information; And (c) executing the correction function by replacing the vehicle position information in which the error occurs with the terminal position information generated by the GPS mobile communication terminal. Provide a way to improve.

According to another object of the present invention, a method for improving car navigation performance by connecting a vehicle navigation system and a GPS mobile communication terminal equipped with a GPS receiver through a USB cable, (a) the vehicle navigation system Periodically receiving and comparing the vehicle reception signal strength of the GPS signal received by the vehicle reception strength measurement unit with the terminal reception signal strength of the GPS signal received from the terminal reception strength measurement unit of the GPS mobile communication terminal; And (b) controlling the GPS terminal to receive GPS information from the satellite based on the GPS antenna having the greater strength of the received signal strength among the vehicle received signal strength and the terminal received signal strength. It provides a method for improving the car navigation performance.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In general, the vehicle navigation system 100 uses the GPS information to determine the direction of travel of the vehicle, the distance from the starting position to the destination position, the current moving speed, the route set before the driver travels, the optimum route from the starting position to the destination position, and the like. Is a road guidance service for displaying a display on a liquid crystal screen, and a description of components required for constructing a navigation system in general, such as a sensor system, navigation control, and communication control, configured to provide such a road guidance service, will be omitted. The navigation device, that is, the vehicle navigation system 100 and the GPS mobile communication terminal 110 connected to each other will be described based on a method for improving car navigation performance by configuring two GPS receivers 130.

FIG. 1 is a block diagram illustrating a schematic configuration of a navigation device for improving car navigation performance by connecting a vehicle navigation system and a GPS mobile communication terminal equipped with a GPS receiver through a USB cable.

The navigation device for improving car navigation performance according to an exemplary embodiment of the present invention includes a GPS mobile communication terminal 110, a vehicle GPS antenna 120, a GPS receiver 130, a program memory 140, and a buffer memory 150. It includes a memory unit, a path error detection unit 160, a vehicle control unit 180, a key input unit 190, a display unit 192, a voice processing unit 194 and the like.

The GPS mobile communication terminal 110 communicates with the vehicle navigation system 100 through a USB cable, and receives GPS information (coordinate information and GPS signals) received from a GPS satellite according to a control command of the vehicle navigation system 100. Extracts the received signal strength, etc.) and transmits the extracted signal strength to the vehicle navigation system 100, and a terminal application for implementing such a function is embedded.

In the exemplary embodiment of the present invention, the vehicle navigation system 100 and the GPS mobile communication terminal 110 are connected by a USB cable, but in addition to the wireless communication method such as Bluetooth (Infrared), IRDA (Infrared Data Association), etc. have.

The vehicle GPS antenna 120 receives GPS radio waves from one or more satellites and transmits them to the GPS receiver 130. In general, satellites may be reminiscent of parabolic antennas. However, GPS requires receiving radio waves from various satellites orbiting the earth, and thus it is impossible to use a high-gain, high-gain antenna such as a parabolic antenna. The vehicle GPS antenna 120 usually has a semi-circular directivity on the top of the ground plain, and receives the primary source polarization transmitted from the satellite.

The GPS receiver 130 calculates navigation data included in GPS radio waves received from the vehicle GPS antenna 120 and transmits the navigation data to the vehicle controller 180.

According to another embodiment of the present invention, the GPS receiver 130 receives the latitude and longitude position information and the time information of the mobile communication terminal, the vehicle navigation system 100, etc., which are calculated through a predetermined processing of the received GPS radio waves, and the vehicle controller 180. Can be configured to forward). That is, the GPS radio waves transmitted from the GPS satellites include ID codes, orbital positions, and visual information of the GPS satellites, and the GPS receiver 130 detects a difference in arrival speed between radio waves emitted from a plurality of GPS satellites. By calculating the position coordinates of the vehicle.

The program memory 140 includes an operating system (OS) software having a real-time processing function for the operation of the vehicle navigation system 100 and communication processing software for processing functions related to communication processing. Is stored, and the vehicle navigation system 100 is connected with the GPS mobile communication terminal 110 by using a USB cable to synchronize the GPS information so that the transmission and reception (Sync) of the vehicle navigation system according to an embodiment of the present invention. When error data is generated in the vehicle location information (coordinate position, movement direction, etc.) of the 100, the terminal location information is received from the GPS mobile communication terminal 110, and the error data of the vehicle location information is corrected to improve car navigation performance. An error correction program is stored. Here, the GPS information refers to data necessary for calculating location information of the vehicle in a driving route service such as coordinate information and identification code information.

In addition, when the error correction program receives the error data of the vehicle location information from the path error detection unit 160, generates an GPS information request signal and transmits it to the GPS mobile communication terminal 110, and from the GPS mobile communication terminal 110. By extracting the coordinate information from the received GPS information and replacing the error data of the vehicle position information, the position information error of the vehicle navigation system 100 is corrected. In the navigation device according to the embodiment of the present invention, when the vehicle navigation system 100 executes a navigation service using the vehicle navigation system as a main receiver for receiving vehicle location information, and an error occurs in the vehicle location information, the GPS mobile communication unit is a receiver. The terminal 110 receives the terminal location information from the terminal 110 and corrects an error of the vehicle location information. Here, the vehicle location information is extracted and generated from the GPS information received from the satellite in the vehicle navigation system 100, the terminal location information is extracted and generated from the GPS information received from the satellite in the GPS mobile communication terminal 110 as Means location information of the same vehicle.

In addition, the error correction program is a GPS signal received from the vehicle reception strength measurement unit of the vehicle navigation system 100 received from the GPS signal received by the terminal received strength measurement unit (not shown) to the mobile communication terminal 110 and not shown (not shown) By periodically receiving and comparing received signal strength indication (RSSI) data of a signal, the pattern is frequently changed to receive GPS information from a satellite based on a GPS antenna having a larger received signal strength.

Here, the antenna of the vehicle navigation system 100 and the GPS mobile communication terminal 110 may include any one or more of a retractable, a whip, a helical, and an active antenna. In addition, the active antenna may be installed in the vehicle navigation system 100 and the GPS mobile communication terminal 110 to control the beam pattern of the active antenna toward the larger received signal strength of the received GPS signal.

On the other hand, the error correction program may be mounted in the program memory 140 in the production stage of the vehicle navigation system 100, or may be downloaded and mounted on a mobile communication service provider server through a wireless Internet connection.

The buffer memory 150 is a concept including a ROM, an EEPROM, a RAM, a flash memory, a volatile, a nonvolatile memory, and the like, and may use any one of them. It is mounted on a substrate. In the ROM region, an operation program and a system program of the vehicle controller 180 are stored, and may be electrically erased or stored again as needed. In addition, the ROM stores variable or state information of a program generated in connection with driving various software, such as an error correction program installed in the program memory 140.

EEPROM (EEPROM) is a memory that can be electrically erased or re-stored, is a non-volatile memory in which data for storage, such as NAM (Number Assignment Module) parameters, telephone numbers, names, short messages, etc. are recorded.

In addition, the buffer memory 150 typically serves as a data buffer when executing an operation program of the vehicle navigation system 100, and temporarily stores data input by the key input unit 190 or externally stores the vehicle. Data such as text or image received by the navigation system 100, GPS information transmitted from the GPS mobile communication terminal 110 according to an embodiment of the present invention, error data of the vehicle location information generated in the vehicle navigation system 100 The received signal strength data of the GPS mobile communication terminal 110 and the vehicle navigation system 100 are stored.

When the route error detection unit 160 executes the road guidance service provided by the vehicle navigation system 100, the vehicle may be departed from the route set from the starting position to the destination position or the vehicle may be weakened due to a weakening of the received signal strength of the GPS signal. If an error occurs in the location information, the function generates error data according to the location information and transmits it to the vehicle controller 180.

The vehicle reception signal strength measurement unit 170 measures the reception strength of the radio frequency signal received through the vehicle GPS antenna 120 and transmits the reception signal strength information measured at a predetermined period to the vehicle controller 180. The GPS mobile communication terminal 110 is also configured with a terminal received signal strength measuring unit (not shown) having the same function.

The vehicle controller 180 controls the overall operation of the vehicle navigation system 100 so that the communication protocol is processed according to a predetermined protocol of network transmission and reception data. In particular, the vehicle controller 180 drives an error correction program to synchronize the GPS information between the vehicle navigation system 100 and the GPS mobile communication terminal 110 so as to transmit and receive GPS information, and the starting position from the path error detector 160. The vehicle off-path data of the set route from the destination to the destination location or error data of the vehicle location information such as coordinate information is received (in the GPS information including the coordinate information of the vehicle navigation system 100 which is the GPS main receiver). When an error occurs), the vehicle location information is extracted by receiving the GPS information generated from the GPS receiver 130 of the GPS mobile communication terminal 110, which is the secondary receiver, and vehicle position information that is error data at the corresponding position where the error occurred. And correcting the error of the vehicle position information by replacing the vehicle position information received from the GPS mobile communication terminal 110. Do it.

The key input unit 190 is provided with a plurality of numeric keys, character keys, and end keys to provide a key selection function for menu selection and command input. Accordingly, the user operates a numeric route, a function key, a cursor movement key, and the like provided in the key input unit 190 to select a driving route service mode to input location information of a starting point and a destination.

The display unit 192 displays an interface screen and a menu for providing a route service, a route guide, a map guide, an input interface for starting and destination locations, a traffic sign and a symbol for a map and a route when the route is provided. Do it. In addition, the display unit 192 may be configured of any one of STN LCD (SuperTwisted Nematic Liquid Crystal Display), TFT LCD (Thin Film Transistor Liquid Crystal Display), PDP (Plasma Display Panel), and organic ELD (Electro Luminescence Display). .

The voice processor 194 detects and outputs voice data for safe driving and driving guidance by grasping the current vehicle state and driving direction to provide driving guidance and safe driving information from the starting position to the destination position. .

FIG. 2 is a flowchart illustrating a method of improving car navigation performance by connecting a GPS mobile communication terminal equipped with a vehicle navigation system and a GPS receiver through a USB cable.

Before explaining FIG. 2, an error correction program is mounted in the vehicle navigation system 100, the vehicle navigation system 100 is connected to the GPS mobile communication terminal 110 through a USB cable, and the vehicle navigation system. It is assumed that the 100 and the GPS mobile communication terminal 110 simultaneously position the vehicle location information.

When the user selects the road guidance service mode from the user menu of the vehicle navigation system 100 in the vehicle being driven to receive the road guidance service, the road guidance service server (not shown) displays vehicle location information of the driving vehicle. System, the car from the GPS mobile communication terminal 110 to generate the driving route information from the starting position to the destination location to output the vehicle navigation system, the display unit 192 of the GPS mobile communication terminal 110 to execute the car navigation It becomes (S200). In addition, since the map data and the route data are stored in the vehicle navigation system and the GPS mobile communication terminal 110 as database information, the driving route information may be generated by itself.

The vehicle navigation system periodically positions the vehicle position information through the route error detection unit 160, and an area to which the driving route information from the starting position to the destination position, from which the new vehicle position information is transmitted from the road guidance service server, is applied. It is determined whether or not the error data of the vehicle position information is generated due to various reasons such as a departure from or a weak reception signal strength of the GPS signal (S202).

When it is determined in step S202 that error data of the vehicle location information has occurred, a GPS information request signal is generated and transmitted to the GPS mobile communication terminal 110 under the control of the vehicle navigation system, and the GPS mobile communication terminal 110 performs the GPS information. In response to the request signal, GPS information including the vehicle location information received by the GPS receiver 130 is transmitted to the vehicle navigation system (S204).

The vehicle navigation system extracts and generates the terminal location information of the corresponding location from the GPS information received from the GPS mobile communication terminal 110, and the terminal location information is generated by using the driving route information of the corresponding location generated when the car navigation is performed. It is determined whether it matches the driving route information (S206). That is, it is determined whether the terminal location information received from the GPS mobile communication terminal 110 is correct data suitable for the driving route.

Here, the vehicle location information is extracted and generated from the GPS information received from the satellite in the vehicle navigation system, the terminal location information is extracted and generated from the GPS information received from the satellite in the GPS mobile communication terminal 110, the terminal is a vehicle If installed in the same location information is the same.

Subsequently, when it is determined in step S206 that the terminal location information received from the GPS mobile communication terminal 110 matches the driving route information generated during the car navigation operation in the vehicle navigation system, the vehicle location information generated when the car navigation is executed in the vehicle navigation system. Error data of the vehicle location information is replaced by replacing the terminal location information of the corresponding location received from the GPS mobile communication terminal 110 (S208). The vehicle is driven to the destination location according to the generated driving route and the voice guidance, and it is determined whether the end signal of the road guidance service is received on the way. If the end signal of the road guidance service is not received, the process proceeds to step S200. When the service termination signal is received, the road guidance service ends when the connection with the mobile communication network is terminated.

In addition, in the vehicle navigation system, the vehicle reception signal strength of the GPS signal received by the vehicle reception strength measurement unit of the vehicle navigation system and the terminal reception signal strength of the GPS signal received from the terminal reception strength measurement unit of the GPS mobile communication terminal 110 are determined. By periodically comparing, the pattern may be further changed from time to time so as to receive GPS information from the satellite based on the GPS antenna having the greater strength of the received signal strength.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, by combining the vehicle navigation system and the GPS mobile communication terminal to configure two GPS receivers, an error occurs in vehicle position information (coordinate position, movement direction, etc.) of the vehicle navigation system as the main receiver. In this case, by receiving vehicle position information from GPS mobile communication terminal, which is a secondary receiver, it corrects the error data in which an error occurs. It can be effective.

In addition, the present invention implements a diversity antenna to receive the GPS information by selecting the greater strength of the received signal strength of the GPS signal of the vehicle GPS antenna of the vehicle navigation system and the GPS antenna of the GPS mobile communication terminal to receive GPS information It is effective to build a more accurate car navigation system by increasing sensitivity.

Claims (9)

A navigation device that improves car navigation performance by connecting a mobile communication terminal equipped with a vehicle navigation system and a GPS (Global Positioning System) receiver through a USB cable. A GPS mobile communication terminal which communicates with the vehicle navigation system and extracts GPS information received from a GPS satellite and transmits the received GPS information to the vehicle navigation system when receiving a GPS information request signal according to a control command of the vehicle navigation system; The GPS, which is connected to the GPS mobile communication terminal, generates the GPS information request signal, transmits the GPS information request signal to the GPS mobile communication terminal, receives the GPS information in response thereto, and receives its GPS information from the GPS mobile communication terminal. A vehicle navigation system replacing information; And Intermediate means for transmitting and receiving the GPS information between the GPS mobile communication terminal and the vehicle navigation system Navigation device that improves car navigation performance by using a GPS mobile communication terminal comprising a. The method of claim 1, wherein the vehicle navigation system, A path error detector configured to generate error data at a corresponding location when an error occurs in the vehicle location information when the road navigation service is executed in the vehicle navigation system, and to transmit the generated error data; When the error data of the vehicle location information is received from the path error detector, the GPS information request signal is generated and transmitted to the GPS mobile communication terminal, and the error data is generated from the GPS information received from the GPS mobile communication terminal. A memory unit in which an error correction program for extracting coordinate information at the generated position and replacing the error data to execute a correction function; And Control the transmission and reception of data according to a predetermined communication protocol, and drive the error correction program stored in the memory unit to send and receive the GPS information between the vehicle navigation system and the GPS mobile communication terminal to the Vehicle control to control for error correction Navigation device that improves the car navigation performance by using a GPS mobile communication terminal comprising a. The method of claim 1, wherein the intermediate means, By using a GPS mobile communication terminal characterized in that any one or more of the USB cable and the wireless communication method Bluetooth, IRDA (Infrared Data Association), RF (RF) method which is a wired communication method is implemented. Navigation device with improved car navigation performance. The method of claim 1, The vehicle navigation system and the GPS mobile communication terminal are respectively provided with the GPS receiver, the vehicle navigation system generates the vehicle location information, the GPS mobile communication terminal generates terminal location information, the vehicle location information and the terminal location. And a navigation apparatus which improves car navigation performance by using a GPS mobile communication terminal, wherein the information indicates location information of the same vehicle. The method of claim 2, wherein the error correction program, By periodically receiving and comparing the vehicle reception signal strength of the GPS signal received by the vehicle reception strength measurement unit of the vehicle navigation system and the terminal reception signal strength of the GPS signal received from the terminal reception strength measurement unit of the GPS mobile communication terminal A navigation device using a GPS mobile communication terminal, wherein the GPS information is improved from a satellite based on a GPS antenna having a greater strength of received signal strength. A method of improving car navigation performance by connecting a GPS navigation terminal equipped with a vehicle navigation system and a GPS receiver through a USB cable, (a) periodically determining vehicle location information in the vehicle navigation system to determine whether error data of the vehicle location information is generated; (b) In step (a), if it is determined that the error data of the vehicle location information is generated, a GPS information request signal is generated and transmitted to the GPS mobile communication terminal, and the GPS information received from the GPS mobile communication terminal. Extracting and generating terminal location information from the terminal; And (c) executing the correction function by replacing the errored vehicle location information with the terminal location information received from the GPS mobile communication terminal; Method for improving car navigation performance using a GPS mobile communication terminal comprising a. The method of claim 6, The vehicle navigation system and the GPS mobile communication terminal are respectively provided with the GPS receiver, the vehicle navigation system generates the vehicle location information, and the GPS mobile communication terminal generates the terminal location information, and the vehicle location information and the terminal. The location information indicates the location information of the same vehicle, the method of improving car navigation performance using a GPS mobile communication terminal. The method of claim 6, wherein the method is (d) periodically transmits a vehicle reception signal strength of the GPS signal received by the vehicle reception strength measurement unit of the vehicle navigation system and a terminal reception signal strength of the GPS signal received from the terminal reception strength measurement unit of the GPS mobile communication terminal; And receiving and comparing the GPS signal from the satellite based on the GPS antenna having the greater strength of the received signal strength, thereby improving car navigation performance. A method of improving car navigation performance by connecting a GPS navigation terminal equipped with a vehicle navigation system and a GPS receiver through a USB cable, (a) periodically transmitting the vehicle reception signal strength of the GPS signal received by the vehicle reception strength measurement unit of the vehicle navigation system and the terminal reception signal strength of the GPS signal received from the terminal reception strength measurement unit of the GPS mobile communication terminal; Receiving and comparing; And (b) controlling GPS information from a satellite based on a GPS antenna having the greater strength of the received signal strength among the vehicle received signal strength and the terminal received signal strength; Method for improving car navigation performance using a GPS mobile communication terminal comprising a.

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