KR20040065845A - Method and Apparatus for Measuring Performance of GPS Equipment and Determining Installation Location of GPS Antenna in a Vehicle - Google Patents

Abstract

PURPOSE: A measuring performance of a GPS(Global Positioning System) apparatus installed on a vehicle and a method and a system for determining an installation position of a GPS antenna. CONSTITUTION: An objective unit(220) comprises a GPS receiver(222) and a GPS antenna(226). The objective unit receives a GPS signal from one or more GPS satellite and generates GPS data to send it. A reference measuring unit(210) comprises an interface kit(214) and a test terminal(212). The interface kit is connected to the GPS receiver and receives GPS data. The interface kit further reference GPS data from a reference GPS receiver(218) and a reference GPS antenna(216). The test terminal is connected to the interface kit and analyzes the GPS data and the reference GPS data to display the analyzed result. A power supply is connected to the interface kit to provide power necessary for driving the objective unit and the reference measuring unit.

Description

Method and Apparatus for Measuring Performance of GPS Equipment and Determining Installation Location of GPS Antenna in a Vehicle}

The present invention relates to a method and system for measuring the performance of a GPS device mounted on a vehicle and determining the mounting position of the GPS antenna. More specifically, the data transmission from the GPS receiver mounted on the vehicle and the reference GPS are connected by connecting a test terminal having a measurement program for GPS data to an interface kit (Kit) having a reference GPS antenna and a built-in reference GPS receiver. The present invention relates to a method and system for measuring performance of a GPS device mounted on a vehicle and determining a mounting position of a GPS antenna by comparing and analyzing reference data transmitted from an antenna and a reference GPS receiver.

In modern society, various means of transportation, including automobiles, have become indispensable means of living for modern people. Especially, automobiles are increasing exponentially with the improvement of living standard. In Korea, for example, the number of cars owned by more than one million in 1985 exceeded 10 million in 1997 and is expected to reach 20 million by 2010. Due to the rapid increase in the number of cars owned, economic losses and environmental pollution due to traffic congestion are also becoming a big social problem.

As such, various methods have been proposed to reduce economic and environmental losses due to the rapid increase in the number of vehicles owned. In particular, the car navigation system (CNS) is emerging as a core technology in the traffic control field. ITS (Intelligent Transport System) is the first to be commercialized. The vehicle navigation system integrates digital road map (DRM), global positioning system (GPS) module, navigation software, etc. to an in-vehicle terminal (a kind of special computer called On Vehicle Control Unit). In addition to displaying the current location of the driver, it can calculate the shortest route and the optimal route to guide the destination if necessary. In addition, traffic information can be received in real time through a communication network to provide a comfortable driving environment and furthermore, to realize efficient use of roads.

In this vehicle navigation system, the most important technology along with the electronic numerical map is the vehicle location tracking system. Two techniques, GPS and Dead Reckoning (DR), are used to track the vehicle. In particular, GPS uses triangulation principles and uses 24 low-orbit satellites that orbit the orbit over the earth. It is a system for measuring absolute position. Developed by the US Department of Defense for military purposes, the system is now actively used in the private sector. However, in the civilian field, unlike military use, there is a disadvantage in that it usually has a positioning error of about 50 m to 300 m.

Recently, a car navigation service providing a variety of traffic information by integrating a vehicle navigation system using GPS into a mobile communication network has been provided.

1 is a block diagram schematically illustrating a car navigation service system using a mobile communication network.

The car navigation service system using a mobile communication network includes a vehicle 100 capable of using a car navigation service, a GPS satellite 110, a mobile communication network 120, and an information providing server 130.

The vehicle 100 includes a mobile communication terminal 102 and a GPS satellite for receiving a predetermined traffic service (route guide, traffic condition guide, main building guide, etc.) through the mobile communication network 120 from the information providing server 130. The GPS antenna 104 for receiving the GPS data signal from the 110, and the GPS receiver 106 for receiving the GPS data signal from the GPS antenna 104 and calculating the position coordinates of latitude and longitude are provided. That is, the GPS data signal received by the GPS antenna 104 from the GPS satellite 110 is input to the GPS receiver 106 to calculate the position and speed of the vehicle 100. In addition, the GPS data signal is transmitted from the mobile communication terminal 102 of the vehicle 100 to the information providing server 130 through the mobile communication network 120, so that the occupant of the vehicle 100 is predetermined from the information providing server 130. Will be able to receive transportation services.

Meanwhile, how well the GPS antenna 104 receives the GPS data signal is important to the vehicle 100 to smoothly receive various traffic information services using the GPS and the mobile communication network. Here, whether the GPS antenna 104 receives the GPS data signal smoothly depends on the in-vehicle mounting position of the GPS antenna 104.

In general, the GPS antenna 104 is installed on the roof or the dash board of the vehicle. In particular, the roof of the vehicle is most suitable because the GPS antenna 104 should be installed at a position facing the sky so as to properly receive the GPS data signal. When mounted on the roof of a vehicle, the GPS antenna is magnetized at the bottom, so it only needs to be attached to the desired location. However, when the GPS antenna 104 is installed on the roof of the vehicle, there is a problem in that the GPS antenna 104 cannot be safely managed and maintained in an optimal operating state due to theft or weather. Therefore, it is common to install the GPS antenna 104 inside the vehicle, in particular on the dashboard.

However, when the GPS antenna 104 is installed inside the vehicle, since the vehicle body design and the internal electrical wiring and the arrangement of the mechanical parts are all different for each vehicle type, the GPS satellite 110 is installed according to the position installed in the vehicle. The reception sensitivity of the GPS data signal transmitted from the picture appears to be different. For example, when the position inside the vehicle where the GPS antenna 104 is installed is a vehicle model in which a lot of electromagnetic waves are generated or a large amount of hot wire passes, the reception sensitivity of the GPS data signal is sharply lowered.

In addition, when the GPS antenna 104 is mounted at an inappropriate location, the time to first fix (TTFF), which is the actual initialization time required for the GPS receiver 106 to initially determine its position, is measured in approximately several minutes. Sometimes it takes more than 10 minutes, there is a problem that causes inconvenience to users of location-based services in location determination.

In spite of many of the problems described above, most users install the GPS antenna 104 at any position of the in-vehicle dashboard where the reception sensitivity of the GPS data signal is relatively flat. Therefore, the reception sensitivity of the GPS data signal, TTFF, etc. are greatly different according to the vehicle type, and a large number of users are complaining about the inaccurate vehicle navigation service.

Currently, in case of consumer complaints related to the vehicle navigation service, a solution is usually to replace the GPS receiver and the GPS antenna with a new one, or to move the GPS antenna mounted on the vehicle with the complaint to an arbitrary position in the vehicle, thereby receiving the sensitivity of the GPS data signal. Finding a good position is a situation that is used in the fist-hole method of remounting the GPS antenna in the position.

This method is expensive to replace the GPS receiver and the GPS antenna with a new one, and it takes a long time to find a point where the reception of the GPS data signal is good in the vehicle. There is a problem in that it does not provide high reliability for sensitivity.

In order to solve the above-mentioned problems, the reference GPS antenna is connected and the test kit including the measurement program for the GPS data is connected to the interface kit having the built-in reference GPS receiver and the data transmitted from the GPS receiver mounted on the vehicle and the reference GPS. An object of the present invention is to provide a method and system for measuring performance of a GPS device mounted on a vehicle and determining a mounting position of a GPS antenna by comparing and analyzing reference data transmitted from an antenna and a reference GPS receiver.

1 is a block diagram schematically illustrating a car navigation service system using a mobile communication network;

2 is a simplified block diagram of a system for measuring and comparing GPS data in accordance with a preferred embodiment of the present invention;

3 is an exemplary screen illustrating a measurement process of GPS data using a test terminal according to a preferred embodiment of the present invention;

4 is a graph showing a C / No value according to a mounting position of a GPS antenna according to a preferred embodiment of the present invention;

5 is an exemplary screen display of the latitude and longitude coordinates of a vehicle for each mounting position of a GPS antenna according to an exemplary embodiment of the present invention in points;

6 is a flowchart illustrating a process for determining the performance of a GPS receiver mounted on a vehicle, the performance of a GPS antenna, and a mounting position according to a preferred embodiment of the present invention.

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

102, 224: mobile communication terminal 104, 226: GPS antenna

106, 222: GPS receiver 110: GPS satellites

210: reference measurement unit 212: test terminal

214: Interface Kit 216: Reference GPS Antenna

218: reference GPS receiver 220: measurement unit

230: power supply

To this end, the present invention is a system for measuring the performance of a GPS device mounted on a vehicle and determining the mounting position of the GPS antenna in the vehicle, and is installed in the vehicle to provide navigation service to the vehicle to receive GPS radio waves from one or more GPS satellites. A measurement unit including a GPS receiver and a GPS antenna for receiving and generating and transmitting GPS data; An interface kit connected with the GPS receiver to receive the GPS data, and receiving reference GPS data from a built-in reference GPS receiver and a connected reference GPS antenna; and a measurement program connected to the interface kit and installed with a predetermined measurement program. A reference measuring unit including a test terminal for comparing and analyzing and displaying the reference GPS data; And a power supply unit connected to the interface kit to supply power for driving the measurement unit and the reference measurement unit. do.

According to another object of the present invention, a method for measuring the performance of a GPS device mounted on a vehicle and determining the mounting position of the GPS antenna in the vehicle, comprising: (a) the reference GPS antenna around the GPS antenna of the unit under measurement; Installing on; (b) driving the measurement program installed in the test terminal to receive and display the reference GPS data from the interface kit; (c) determining whether the reference GPS data is good or not by the measurement program; And (d) determining whether the GPS receiver and / or the GPS antenna are defective and whether or not the mounting position of the GPS antenna is appropriate according to the determination result of the measurement program. It provides a method of measuring the performance of a device and determining the mounting position of a GPS antenna.

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.

2 is a simplified block diagram of a system for measuring and comparing GPS data in accordance with a preferred embodiment of the present invention.

The measurement system of GPS data according to an exemplary embodiment of the present invention includes a reference measurement unit 210 that is a reference for comparative measurement, a measurement unit 220, and a power supply unit 230, which are measurement targets of GPS data. The reference measuring unit 210 is composed of predetermined devices for obtaining GPS data as a reference in a positioning system using GPS. Hereinafter, the GPS related information measured by the reference measuring unit 210 will be referred to as reference GPS data, and the GPS related information measured by the measured unit 220 will be referred to as GPS data.

First, the reference measurement unit 210 includes an interface kit 214 to which the test terminal 212 and the reference GPS antenna 216 are connected, and in which the reference GPS receiver 218 is built.

The test terminal 212 guides the connection between the components for driving the GPS data measuring system for determining whether the quality of the GPS data of the measurement unit 220 according to the embodiment of the present invention is good, and GPS A predetermined guide program for guiding the state of the receiver 222 and the installation position of the GPS antenna 226 is installed. Accordingly, the user drives the guide program of the test terminal 210 to connect the interface kit 214 to the power supply 230 as illustrated in FIG. 2 according to the guide program guide, and the test terminal 212 and Connect the GPS receiver 222 to the interface kit 214.

In addition, the test terminal 212 collects and compares and analyzes the reference GPS data measured by the reference measurement unit 210 and the GPS data transmitted from the GPS receiver 222 of the measurement unit 220 together. The program is installed. GPS data collected by the measurement program according to an embodiment of the present invention and displayed on the test terminal 212 includes a GPS, date, time, TTFF, longitude, latitude, DOP (Dilution of Precision), number of visible satellites, and use. Satellite number, PRN (Pseudo-Random Noise), C / No (Carrier to Noise).

In addition, the measurement program installed in the test terminal 212 includes information on allowable values such as TTFF, DOP, number of satellites used, and reception sensitivity for determining whether the reference GPS data and the GPS data quality are satisfactory. . Therefore, the measurement program compares the reference GPS data or the GPS data received from the reference measurement unit 210 or the measurement unit 220 with the information on the allowable numerical value that it has and determines whether the reference GPS data or the GPS data quality is good. do.

Here, the GPS in operation indicates the operating states of the reference measuring unit 210 and the measurement unit 220, and TTFF indicates a GPS receiver of the reference GPS receiver 218 or the measurement unit 220 of the reference measurement unit 210. It is time for 222 to operate normally. Typically TTFF should be a value between 1 minute and 2 minutes can be said to be good.

In addition, DOP is a value indicating the evenness of the positioning of the GPS satellites seen by the GPS receiver. The positioning of the GPS satellites is more important than the number of visible satellites in positioning using GPS. The larger the volume of the polygon connecting the GPS receiver to the visible satellite, the smaller the DOP value is. The accuracy is increased. In general, when the value of DOP is 2 or less, a very good state, a good state when having a value of 2 to 3, a normal state when having a value of 4 to 5, there is no utility value when having a value of 6 or more can see.

In addition, the DOP according to an embodiment of the present invention includes a Position DOP (PDOP), a Geometric DOP (GDOP), a Horizontal DOP (HDOP), a Vertical DOP (VDOP), and the like.

The visible satellites and the used satellites represent the number of satellites used and the satellites seen by the reference GPS receiver 218 of the reference measurement unit 210 or the GPS receiver 222 of the measurement unit 220. RPN represents the unique number of the GPS satellites, and C / No represents the reception sensitivity of the GPS signal transmitted from each GPS satellite, which is important for analyzing the performance of the GPS receiver with a signal-to-noise ratio in the 1 Hz bandwidth. It is an indicator. In other words, the better the C / No value (the larger the value of C / No), the better the GPS receiver receives the GPS radio waves.

In addition, the test terminal 212 stores predetermined reference data for determining whether the measured GPS data is good. Therefore, the measurement program installed in the test terminal 212 compares the measured GPS data with the reference data to determine whether the measured GPS data is good. Of course, the determination of whether the measured GPS data is good may be made manually by an operator.

On the other hand, although the PDA (PDA) is shown as a test terminal 212 in Figure 2, other portable terminals such as mobile phones, etc. will be possible.

The interface kit 214 collects GPS data transmitted from the reference GPS receiver 218 and the GPS receiver 222, and converts the GPS data into a data format usable by the test terminal 212. The interface kit 214 and the test terminal 212 and the GPS receiver 222 may be connected by a serial cable through an RS-232C port, which is a serial port.

The reference GPS antenna 216 receives GPS radio waves from a plurality of GPS satellites floating in outer space at an altitude of about 21,000 km to determine the position of the vehicle based on the distance from each GPS satellite to the car and the orbit of the GPS satellites. It's an important device that makes it possible. In general, a satellite may be associated with a parabolic antenna. However, since a GPS requires receiving GPS radio waves from a number of satellites orbiting the earth, a directional and high-gain antenna such as a parabolic antenna may be used. Can't. GPS antennas usually have a semi-circular directivity on the top of the ground plain and receive preferential source polarizations transmitted from satellites.

The reference GPS receiver 218 receives the GPS data included in the received GPS radio waves from the reference GPS antenna 216 and passes them through the predetermined process to the interface kit 214. That is, the reference GPS receiver 218 calculates the difference in the arrival speed between the GPS radio waves emitted from the plurality of GPS satellites to calculate the longitude and latitude coordinates of the current position.

On the other hand, although the GPS standard location service's location accuracy is 95% in the horizontal plane and the error range is about 100 m, DGPS (Differential GPS) has recently been used in the positioning system for more accurate vehicle location tracking. have. Therefore, the installation position determination and test system 200 of the GPS antenna 210 according to the embodiment of the present invention may be equally applicable to the DGPS. Here, the DGPS removes an error component from a pseudo range measurement value based on information currently transmitted from a satellite from a known base station, and informs the GPS user of the surrounding that the error component has been removed, thereby enabling improved positioning. It's a system that lets you. Since DGPS is a well-known technique well known to those skilled in the art, a detailed description thereof will be omitted.

The to-be-measured unit 220 is a part mounted in a vehicle that receives a navigation service using GPS, and includes a GPS receiver 222, a mobile communication terminal 224, and a GPS antenna 226. The technical idea of the present invention can be applied to vehicles such as automobiles, buses, vans and vans that can use navigation services.

The GPS receiver 222 and the GPS antenna 226 of the measurement unit 220 differ only in the performance and the mounting position of the device, and the reference GPS receiver 222 and the reference GPS antenna 226 described in the reference measurement unit 210. Since it performs the same function as, detailed description will be omitted.

The mobile communication terminal 224 has a predetermined program for receiving navigation services such as road guidance, road information, and traffic information using the GPS receiver 222, the GPS antenna 226, and the mobile communication service provider server installed in the vehicle. It is a dedicated terminal that can use the installed navigation service.

The power supply unit 230 is a component for applying power for driving the devices constituting the reference measurement unit 210 and the measurement unit 220 according to an embodiment of the present invention. It would be desirable to use a Cigar Jack (not shown) which is a supply device.

3 is an exemplary screen illustrating a measurement process of GPS data using a test terminal 212 according to a preferred embodiment of the present invention.

In screen 3A, you can see that the initial menu items are "Vehicle Recommendations", "Interface Installation", and "GPS Comparison Test". Here, the operator may select the "interface installation" menu to perform the connection or connection of each device described in Figure 2 in the order displayed. Of course, considering that the work according to the embodiment of the present invention is usually performed by a skilled worker will be able to perform a smooth connection of each device without the help of the "interface installation" menu.

As described with reference to FIG. 2, the operator who completes the connection work of each device may measure the GPS data of the reference measurement unit 210 and the measurement unit 220 by selecting the “GPS comparison test” menu.

Screen 3B illustrates a measurement screen of GPS data including various parameters of the GPS data, a reference GPS data area, and a GPS data area of the unit 220 according to an embodiment of the present invention. Since each parameter displayed on the screen 3B has already been described with reference to FIG. 2, a detailed description thereof will be omitted. Therefore, the operator checks the reference GPS data value displayed on the screen 3B and the GPS data value of the unit 220 to check the state of the GPS receiver 220 and / or the GPS antenna 224 of the unit 220 to be measured. Or determine an appropriate mounting location for the GPS antenna 224.

4 is a graph showing the C / No value according to the mounting position of the GPS antenna 224 in accordance with a preferred embodiment of the present invention.

The top view of the vehicle in FIG. 4 shows the front of a vehicle including a dashboard on which a GPS antenna 224 is generally installed. The distance between each point is about 10 cm, and GPS data is measured several times at each point.

Referring to the comparative measurement process of the GPS data according to an embodiment of the present invention in detail, the operator first installs the reference GPS antenna 216 next to the GPS antenna 226 mounted in the vehicle, the reference GPS data Acquire. When the reference GPS data acquired several times exceeds a predetermined reference value, it can be seen that the installation position of the GPS antenna 226 of the measurement unit 220 is appropriate, and the GPS receiver 220 or the GPS antenna 226 is appropriate. ) Can be determined to be poor.

Therefore, the worker who has confirmed that the GPS receiver 220 or the GPS antenna 226 is bad, the reference GPS antenna 216 by the reference measurement unit 210 to determine a bad device among the GPS receiver 220 and the GPS antenna 226. ) Is connected to the GPS receiver 220 of the measurement unit 220. Then, GPS data is acquired several times using the measurement program installed in the test terminal 210. Since the reference GPS antenna 216 is in a good state, if the acquired GPS data is good, it may be determined that the GPS antenna 226 of the measurement unit 220 is bad, and if the acquired GPS data is bad, the GPS receiver 220 It can be seen that it is poor due to deterioration or aging.

On the other hand, if both the GPS receiver 220 and the GPS antenna 226 is bad through the above-described process, it is possible to first determine the failure of the GPS receiver 220. Then, the GPS antenna 226 of the measurement unit 220 is removed, connected to the interface kit 214 of the reference measurement unit 210, and the GPS data is repeatedly used several times using the test terminal 212. Acquire. Since the reference GPS receiver 218 is in a good state, if the acquired GPS data is good, the GPS antenna 226 may be determined to be good, and if the acquired GPS data is bad, the GPS antenna 226 may be determined to be bad. .

On the other hand, if the reference GPS data acquired several times fall below a predetermined reference value, it may be determined that the mounting position of the GPS antenna 226 is not appropriate. Therefore, when it is determined that the mounting position of the GPS antenna 226 is not appropriate, the reference GPS antenna 216 is connected to the GPS receiver 220 of the measurement unit 220 and installed at each point of FIG. Will be obtained.

Therefore, the operator determines the optimal mounting position of the GPS antenna 226 by replacing the GPS receiver 220 and / or the GPS antenna 226 with the above-described process, or in the case where both equipments are good. GPS antenna 226 will have to perform the task of reinstalling.

The C / No numerical graph at the bottom of FIG. 4 shows the C / No numerical value and the change trend for each measurement point at the upper side. Looking at the C / No numerical graph, it can be seen that the C / No numerical values of points 2, 4, 5, 6 and 13 are good. On the other hand, it can be seen that the C / No values at points 3, 7, 8, 9, 10 and 11 are almost zero. For example, it can be seen that the point numbers 3 and 8 to 12 are extremely poor reception sensitivity since they are mechanically operated positions of the airbag mounted on the front part of the vehicle.

Therefore, the operator checks the C / No value displayed on the test terminal 212, and moves the GPS antenna 226 of the side and the part 220 to the point number 4 or 5 having the best value. Would be desirable.

FIG. 5 is an exemplary screen showing latitude and longitude coordinates of a vehicle for each mounting position of a GPS antenna 226 according to an exemplary embodiment of the present invention.

Referring to FIG. 5, it can be seen that the latitude and longitude coordinates of the vehicle measured several times at the left side, the center of the driver's seat, and the point next to the rearview mirror are displayed near the center of the circle with a plurality of points. Each point is indicated at a point corresponding to the latitude and longitude coordinates of the vehicle measured using the test terminal 212. Looking at the upper right of the figure on the left side of the driver's seat, the average displacement is 3.6 m and the maximum displacement is 15.9 m. Similarly, it can be seen that the mean displacement value is 2.9 m, the maximum displacement value is 13.9 m, and the mean displacement value is 2.6 m and the maximum displacement value is 8 m at the center of the rear mirror.

On the other hand, considering that the smaller the difference between the latitude and longitude coordinates measured at a specific point, the better the positioning, the smaller the average shift value or the maximum shift value, the better the positioning accuracy of the vehicle. That is, in FIG. 5, it may be determined that the side of the rearview mirror having a small average shift value or the maximum shift value is the best point in the mounting position determination method of the GPS antenna 226 using latitude and longitude coordinates. Of course, even if the average shift value or the maximum shift value is not directly checked, even if only the shape where the latitude and longitude points are gathered in FIG. 5, the points next to the rearview mirror are closely related to each other, and it will be immediately understood that the point is good for positioning.

6 is a flowchart illustrating a process for determining the performance and mounting position of the GPS receiver 220 and the performance of the GPS antenna 226 mounted on the vehicle according to an embodiment of the present invention.

In FIG. 6, it is assumed that an operator has already completed the interface connection work between the apparatuses of the reference measuring unit 210 and the unit under test 220 described with reference to FIG. 2. The operator who completes the connection work between the reference measuring unit 210 and the devices of the measuring unit 220 is located next to the GPS antenna 226 of the measuring unit 220 mounted on the vehicle. Install 216 (S600). Here, as the reference GPS antenna 216 is installed closer to the GPS antenna 226, the more preferable the result will be obtained when the reference GPS antenna 216 is installed in the same direction.

When a GPS comparison test menu is selected by driving a measurement program installed in the test terminal 212 by an operator or the like having the reference GPS antenna 216 selected, the measurement program receives the reference GPS data received from the reference GPS receiver 218. Received (S602).

The measurement program extracts only predetermined data from among the reference GPS data transmitted in step S602 and displays it on the screen of the test terminal 212 (S604).

The measurement program installed in the test terminal 212 determines whether the displayed GPS data exceeds a predetermined reference value stored in advance (S606).

If it is determined that the reference GPS data is good by the measurement program, the reference GPS antenna 216 is connected to the GPS receiver 220 of the measurement unit 220 (S608).

When the reference GPS antenna 216 is connected to the GPS receiver 220, GPS data is acquired by the measurement program installed in the test terminal 212 and displayed on the screen of the test terminal 212 (S610).

The measurement program determines whether the GPS data acquired in step S610 is good enough to exceed a predetermined reference value stored in advance (S612).

If the GPS data is good in step S612, the measurement program determines that the GPS antenna 226 is bad (S614). If the GPS data is bad, the measurement program determines that the GPS receiver 220 is bad and displays the determination result (S616). ).

On the other hand, when it is determined in step S606 that the reference GPS data is poor by the measurement program, the operator measures the GPS data while sequentially moving the reference GPS antenna 216 to an arbitrary position of the preset vehicle (S618).

The measurement program determines whether the measurement operation of the ongoing GPS data in step S618 is completed (S620). If it is determined in step S620 that the measurement of GPS data has not been completed, the measurement program proceeds to step S618 to continue the measurement.

Otherwise, if it is determined in step S620 that the measurement operation of the GPS data is completed, the GPS data measured at each location is displayed on the screen of the test terminal 212 (S622).

The measurement program installed in the test terminal 212 determines and displays the position where the GPS antenna 226 is mounted using the GPS data measured at each position (S624).

Therefore, the operator can move and mount the GPS antenna 226 at the mounting position displayed on the screen of the test terminal 212 in step S624.

The above description is merely illustrative of the present invention, and those skilled in the art to which the present invention pertains may various modifications without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed herein are not intended to limit the present invention but to describe the present invention, and the spirit and scope of the present invention are not limited by these embodiments. It is intended that the scope of the invention be interpreted by the following claims, and that all descriptions within the scope equivalent thereto shall be construed as being included in the scope of the present invention.

Conventionally, when a problem occurs due to a GPS receiver or a GPS antenna mounted on a vehicle, the GPS receiver or the GPS antenna is newly replaced or the GPS antenna is retrofitted in another position. However, according to the present invention, the reference GPS receiver and the reference GPS antenna are Can be used to pinpoint bad equipment.

In addition, if the GPS receiver and GPS antenna installed in the vehicle are in good condition, the GPS receiver can find a specific place where GPS data can be easily received by using information such as GPS sensitivity, TTFF, satellite acquisition, and DOP. Re-installing the antenna can effectively solve problems or complaints caused by GPS equipment.

Claims (17)

A system for measuring the performance of a GPS device mounted on a vehicle and determining the mounting position of the GPS antenna in the vehicle, A measurement unit installed in the vehicle to provide a navigation service to the vehicle, the measurement unit including a GPS receiver and a GPS antenna configured to receive GPS radio waves from one or more GPS satellites to generate and transmit GPS data; An interface kit (Kit) connected to the GPS receiver to receive the GPS data and receiving reference GPS data from a built-in reference GPS receiver and a connected reference GPS antenna, and connected to the interface kit and a predetermined measurement program is installed A reference measuring unit including a test terminal for comparing, analyzing and displaying the GPS data and the reference GPS data; And A power supply unit connected to the interface kit to supply power for driving the measurement unit and the reference measurement unit; Performance measurement of the GPS device mounted on the vehicle and mounting position determination system of the GPS antenna comprising a. The method of claim 1, The vehicle includes a vehicle, a bus, a van, a van, and the performance measurement system of a GPS device mounted on a vehicle, and a positioning system for mounting a GPS antenna. The method of claim 1, The system for measuring the performance of the GPS device and the positioning system for mounting the GPS antenna is also applied to differential GPS (DGPS), characterized in that the performance measurement of the GPS device mounted on a vehicle and mounting position determination system of the GPS antenna. The method of claim 1, The GPS data and the reference GPS data include information about Time To First Fix (TTFF), Dilution of Precision (DOP), number of satellites used, latitude and longitude coordinates, and carrier to noise (C / No), which is a reception sensitivity. A system for measuring the performance of a GPS device mounted on a vehicle and mounting position determination system of a GPS antenna. The method according to claim 1 or 4, The measurement program includes information on the GPS data allowance value of the TTFF, the DOP, the number of satellites used, and the reception sensitivity for determining whether the reference GPS data and the GPS data are good or not. Performance measurement of the GPS device mounted on the and positioning system of the GPS antenna. The method of claim 5, wherein The DOP is any one of Position DOP (PDOP), Geometric DOP (GDOP), Horizontal DOP (HDOP), Vertical DOP (VDOP), characterized in that the performance measurement of the GPS device mounted on the vehicle and determine the mounting position of the GPS antenna system. The method of claim 1, The test terminal includes a mobile phone, a PDA (PDA), the performance measurement system of the GPS device mounted on the vehicle and the GPS antenna mounting position determination system. A measurement unit including a GPS receiver and a GPS antenna mounted on a vehicle for receiving and transmitting GPS data; An interface kit receiving the GPS data connected to the GPS receiver and receiving reference GPS data generated from a built-in reference GPS receiver and a connected reference GPS antenna, and comparing and analyzing the GPS data and the reference GPS data to display As a method of measuring the performance of a GPS device mounted on a vehicle by using a system consisting of a reference measuring unit including a test terminal, and determining the mounting position of the GPS antenna in the vehicle, (a) installing the reference GPS antenna around the GPS antenna of the measurement unit; (b) driving the measurement program installed in the test terminal to receive and display the reference GPS data from the interface kit; (c) determining whether the reference GPS data is good or not by the measurement program; And (d) determining whether the GPS receiver and / or the GPS antenna are defective and whether the mounting position of the GPS antenna is appropriate according to the determination result of the measurement program. Method for measuring the performance of the GPS device mounted on the vehicle and mounting position of the GPS antenna, comprising a. The method of claim 8, wherein in step (a) The reference GPS antenna is installed in the same direction in close proximity to the GPS antenna, the performance measurement method of the GPS device mounted on a vehicle and the mounting position determination method of the GPS antenna. The method of claim 8, wherein in step (b) The reference GPS data displayed on the test terminal includes date, time, TTFF, DOP, latitude and longitude coordinates, the number of visible satellites, the number of satellites used, the unique number of the GPS satellites, and C / No. How to measure the performance of GPS devices mounted on vehicles and determine the mounting position of GPS antennas The method of claim 8, wherein in step (c) The measurement program includes information on GPS reference and GPS data allowance values for determining whether the GPS data is good or not. Way. The method according to claim 8 or 11, wherein The measurement program determines that the reference GPS data is good when the reference GPS data exceeds the allowable GPS data value, and determines that the reference GPS data is bad when the reference GPS data is not exceeded. How to measure performance and determine the mounting position of a GPS antenna. 9. The method of claim 8, wherein in the step (c), if the reference GPS data is good, (c1) separating the reference GPS antenna from the interface kit; (c2) connecting the separated reference GPS antenna to the GPS receiver; (c3) receiving the GPS data by driving the measurement program of the test terminal; (c4) determining whether the GPS data is good by the measurement program; And (c5) determining whether the GPS receiver or the GPS antenna is defective according to a determination result of whether the GPS data is good or not; Method for measuring the performance of the GPS device mounted on the vehicle and mounting position of the GPS antenna, comprising a. The method of claim 13, wherein in step (e) And the measurement program determines that the GPS antenna is inferior when the GPS data is good. The method of claim 13, wherein in step (e) And the measurement program determines that the GPS receiver is inferior when the GPS data is inferior. The method of claim 8, wherein in the step (c), if the reference GPS data is bad, (c6) the reference GPS antenna is moved to one or more predetermined positions of the vehicle and the GPS data is measured by the measurement program; (c7) the measuring program determining whether the measuring operation of the GPS data is completed; (c8) displaying the GPS data measured at each location on the test terminal when the measurement of the GPS data is completed; And (c9) the measurement program determining the position where the GPS antenna is to be mounted using the GPS data; Method for measuring the performance of the GPS device mounted on the vehicle and mounting position of the GPS antenna, comprising a. The method of claim 16, wherein in step (d) And the measurement program displays the determined mounting position of the GPS antenna on the test terminal.