KR100576018B1 - Telematics system having agps function - Google Patents

Abstract

The present invention relates to a telematics system, comprising: a positioning server that collects, stores, and manages AGPS information, calculates a current position of a moving object using a GPS signal transmitted through a mobile communication network connected to a mobile communication network, and current position information of the moving object. A telematics server for generating telematics service information data based on the information, a telematics kit for providing a user with a service suitable for a current position of a mobile object using the telematics service information data generated by the telematics server, and the location server. It includes a GPS phone to quickly receive a GPS signal using the AGPS information and then transfer the GPS signal to the positioning server and transmit the telematics service information data generated by the telematics server to the telematics kit. Therefore, the present invention can shorten the initial position measurement time of the terminal, even if the telematics kit that does not perform the AGPS function, there is an effect that can use the AGPS information without adding a separate chip.

A.P.S., AGPS, Telematics, Initial Location, Positioning Server

Description

TELEMATICS SYSTEM HAVING AGPS FUNCTION}             

1 is a block diagram of a conventional telematics system,

2 is a diagram illustrating a service procedure using current location information of a conventional telematics system;

3 is a block diagram of a telematics system according to an embodiment of the present invention,

4 is a processing procedure diagram for an initial position calculation process of a telematics system according to an embodiment of the present invention;

5 is a processing procedure diagram for a position calculation process of a telematics system according to an embodiment of the present invention.

TECHNICAL FIELD The present invention relates to a telematics system, and more particularly, to a telematics system having an A.P.S. function capable of improving an initial position search time and a sensitivity of a GPS.

Telematics (telematics) is a compound word of telecommunications and information sciences, and it adds mobile communication means to a common navigation device based on a GPS (Global Positioning System) positioning device to provide drivers with real-time traffic information. It is a technology that provides geographic information and life information.

In particular, the telematics system provides an optimal route guidance service based on real-time traffic information. To this end, when receiving the current location and destination information set by the driver, the telematics system calculates the optimal route considering the real-time traffic information and transmits the result to the user. In this case, the current location obtained from the GPS receiver may be used for various location-based services based on the route guidance service.

In order to provide the optimal route guidance service based on the real-time traffic information, the telematics system notifies the positioning technology (location) and the route to the destination in addition to the mobile communication technology. Routing technics should be integrated, and the present invention relates to positioning technology among them.

GPS was designed for military use by the Pentagon, but some functions are licensed for civilian use. Civil GPS satellite signals are generated by modulating carrier signals with signals multiplied by navigation data and a unique PRN (Pseudo Random Noise) code. At this time, the navigation data refers to the data sent by the GPS satellite at the transmission rate of 50bps so that the user can know the position of the GPS satellite. The navigation data includes information on the normal operation status of the satellite and the satellite clock error. Parameters, satellite orbit information, and correction values for estimating the time delay of the signal by the ionosphere.

The GPS receiver receives such a GPS satellite signal and demodulates the carrier and PRN codes from the GPS satellite signal and decodes the navigation data. Therefore, the mobile terminal equipped with the GPS receiver can know its position by accurately calculating the position of the corresponding satellite from the navigation data and measuring the distance from the corresponding satellite to the mobile terminal. At this time, the distance from the satellite to the mobile terminal is measured by measuring the phase of the unique PRN code for each satellite included in the GPS signal, and then calculating the time of arrival from the corresponding satellite (TOA). This is called pseudo-range.

On the other hand, unlike the general CDMA signal reception, GPS signal reception should be performed at the same time the signal search (search) and tracking (tracking) process in the carrier and code domain. This is because GPS signals are affected by the Doppler transition (several kHz) due to the fast satellite moving speed. Therefore, the telematics system that measures the position using the GPS signal has a disadvantage in that it takes a long time to measure the initial position. In addition, the layout of GPS satellites is designed so that at least 6 GPS satellites can be observed anywhere on earth, but only less than 4 satellites are observed due to multipath or attenuation caused by obstacles such as buildings / streets. This can often happen.

1 is a block diagram of a conventional telematics system. Referring to FIG. 1, a telematics system includes a telematics terminal 10 including a GPS receiver 11, a processor 13, and a communicator 15, a telematics server 20, and a mobile communication system 30. It is composed.

2 is a diagram illustrating a service procedure using current location information of a conventional telematics system.

A service procedure using current location information of a conventional telematics system will be described with reference to FIGS. 1 and 2 as follows.

First, the telematics terminal 10 receives a GPS signal to measure a current location, transmits the measurement result to the telematics server 20, and requests a service using the current location information (S11). To this end, the GPS receiver 11 receives and transmits a GPS signal transmitted from a GPS satellite to the processing unit 13, and the processing unit 13 measures the current position of the corresponding telematics terminal 10 using the GPS signal. Transfer to the communication unit 15. The communication unit 15 transmits the current location to the telematics server 20 in the form of a message. Meanwhile, in the case of the route guide service, the communication unit 15 includes the destination information requested by the user in the message type information and transmits the information to the telematics server 20. At this time, the communication unit 15 may be implemented in a form embedded in the telematics terminal 10 or operate in conjunction with a conventional mobile communication terminal (eg, a mobile phone). In particular, a GPS phone equipped with the GPS receiver 11 may be used.

Then, the telematics server 20 generates various service information related to the current location by using the current location transmitted from the telematics terminal 10 (S13), and provides the current location related service to the telematics terminal 10 ( S15).

In this case, the telematics server 20 may not generate telematics service information when the initial position of the telematics terminal 10 is not obtained. That is, after the GPS receiver of the telematics terminal 10 retrieves the frequencies and codes of all the satellites, it determines the current position and transmits the information to the telematics server 20 to generate the telematics service information. However, when there is no information in the telematics terminal 10 (eg, when there is no AGPS information), the telematics terminal 10 searches a search space composed of frequencies and codes for all satellites in order to acquire a GPS signal. You must search sequentially. In addition, satellite orbit information and approximate user location / time information are not used.

Therefore, the conventional telematics system takes a long time to measure the initial position, which causes a disadvantage in that the service start time is delayed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above shortcomings, and a first object of the present invention is to provide a telematics system that enables a quick telematics service by shortening an initial position measurement time of a telematics system.

It is a second object of the present invention to provide a telematics system for increasing the reception strength of a GPS signal in an urban area having a weak GPS signal by using satellite orbit information and approximate user location information.                         

A third object of the present invention is to provide a telematics system that utilizes the A.P.S. function provided by a mobile communication system using a conventional GPS phone without additional function.

A telematics system having an APS function for achieving the above object collects, stores, manages, and moves APS information including the orbit information and correction information of a GPS satellite. A positioning server that calculates the current position of the mobile by using a G.P.S signal connected to a communication network and transmitted through a mobile communication network, and receives the current position of the mobile from the positioning server in response to a telematics service request. A telematics server that generates telematics service information data based on the current location information of the user, and receives a user's telematics service request information and uses the telematics service information data generated by the telematics server to provide a service suitable for the current location of the mobile object Telematics kit provided to the, the positioning server and the mobile Transmit / receive data through trust network and quickly receive GPS signal by using GPS information transmitted from the positioning server, and then transfer the PS signal to the positioning server. And transmitting the telematics service request information of the telematics kit to the telematics server and transmitting the telematics service information data generated by the telematics server to the telematics kit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

3 is a block diagram of a telematics system according to an embodiment of the present invention. Referring to FIG. 3, a telematics system according to an embodiment of the present invention includes a telematics kit 110, a GPS phone 150, a telematics server 300, and a mobile communication system. A PDE (Position Determination Entity) server (also called a positioning server) 400 connected to the exchange of 300 is included. In particular, the PDE server 400 is connected to the telematics server 200 via the Internet 500.

The telematics kit 110 receives the telematics service request information of the user through the GPS phone 150 and provides the user with a service suitable for the current location of the mobile object by using the telematics service information data generated by the telematics server 200. For this purpose, the telematics kit 110 includes a GPS receiver 111 and a processor 113. The GPS receiver 111 receives GPS satellite signals to measure position data, and the processing unit 113 is connected to the GPS phone 150 and manages the operation of the telematics kit 110 based on an operation signal. In particular, the processor 113 receives the telematics service information data generated by the telematics server 200 through the GPS phone 150, and compares the telematics service information data and the data measured by the GPS receiver 111 with each other. Provide various services (eg, navigation services, etc.) that are appropriate for the location.

The GPS phone 150 may receive a GPS signal from a GPS satellite by itself, and in particular, receives the AGPS data from the PDE server 400 and uses the signal to receive a GPS signal more quickly. Send to server 400. At this time, the GPS phone 150 includes the mobile communication function module and uses the mobile communication function module when transmitting and receiving data with the PDE server 400. That is, the GPS phone 150 and the PDE server 400 transmit / receive data through the mobile communication system 300.

The telematics server 200 receives the telematics service related information from the GPS phone 150, for example, when the user requests a route guidance service, receives the destination information input by the user, and receives the GPS phone 150 from the PDE server 400. Receives the current location information of the path data from the current location to the destination input by the user, and generates the route data from the current location to the destination via the GPS phone 150 to the telematics kit 110. The telematics server 200 may consider traffic information when generating route data.

The PDE server 400 is connected to the switching center of the mobile communication system 300 and can know the approximate location of the GPS phone 150 via the mobile communication system 300. In addition, the PDE server 400 may calculate the current position of the GPS phone 150 through transmitting / receiving Assisted GPS (AGPS) information with the GPS phone 150. In addition, the PDE server 400 communicates using the GPS phone 150 and the protocol according to the standard of the mobile communication network (IS-801).

In this case, 'AGPS' is a method of measuring a location by receiving a GPS signal, and the satellite track information and error information previously measured by the terminal to measure the location of the terminal. Say how to use. This is to reduce the long warm-up time of GPS due to navigation data reception, and there is an advantage that the position of the terminal can be obtained in a short time by using AGPS. In other words, in order to acquire a GPS signal, a GPS receiver must sequentially search a search space consisting of frequencies and codes for all satellites. However, when using AGPS, the GPS receiver can roughly know the user's location and time information based on the pre-measured satellite orbit information and error information, thereby predicting the satellite number and the Doppler transition value seen from the user's location. Therefore, the GPS receiver can reduce the number of satellites to be searched, thereby reducing the time for measuring the position of the terminal.

4 is a flowchart illustrating an initial position calculation process of a telematics system according to an exemplary embodiment. Referring to FIG. 4, first, when a user requests a route guidance through the GPS phone 150 (S101), the telematics kit 110 transmits the destination information input by the user through the GPS phone 150 to the telematics server 200. Transfer to (S102, S104). That is, when a user inputs destination information by a method such as button manipulation and voice input of the telematics kit 110, the telematics kit 110 transmits the destination information to the GPS phone 150 (S102) and the GPS phone 150. ) Transmits the destination information received from the telematics kit 110 to the telematics server 200 (S104). At this time, the GPS phone 150 and the telematics server 200 communicate with each other via a mobile communication network.

The telematics server 200 receiving the destination information requests the PDE server 400 located in the mobile communication network for the current location of the GPS phone 150. That is, the telematics server 200 transmits a message GPOSREQ requesting the current location of the GPS phone 150 to the PDE server 400 through the mobile position center (MPC) 320 (S105 and S106). The MPC 320 is responsible for determining the appropriate PDE to be used for positioning the GPS 150. That is, the MPC 320 analyzes the request of the telematics server 200, selects a PDE server 400 suitable for the request, and requests the current location of the GPS phone 150 from the selected PDE server 400. In this case, the component requesting the location information to the MPC 320 may be a service other than the telematics server 200 (for example, a service that delivers the surrounding information to the user based on the current location of the user, a destination to be tracked). Servers that provide periodic tracking for such servers. Therefore, when the MPC 320 receives a request for location information from the service server, the MPC 320 should analyze the request and check whether the request is from the telematics server 200 and provide appropriate information.

Upon receiving the location request message (GPOSREQ) through the MPC 320, the PDE server 400 uses the data measured by the GPS phone 150 to send the IS-801 message to the MSC to calculate the current location of the GPS phone 150. And transmits it to (Mobile Switch Center) 310. At this time, the IS-801 message is a CDMA positioning service standard, and defines an interface between a mobile communication terminal and a mobile communication network so that a GPS phone can quickly determine its own location. That is, AGPS related information is included in the IS-801 message.

To this end, the PDE server 400 performs SMDPP (SMSDeleveryPointToPoint INVOKE) initialization (S108) and delivers the IS-801 message in the form of SMDPP (S110). In this case, the SMDPP is a predefined message between the PDE server 400 and the switching station on the mobile communication system. The SMDPP includes ServiceIndicator, ActionCode, SMS_BearerData, and the like. The PDE server 400 loads data requesting the location information of the GPS phone 150 according to the IS-801 standard definition in the double SMS_BearerData and transmits the data to the switching center on the mobile communication system, and the switching center also sends the PDE server 400 through this message. Respond to your request.

Meanwhile, the MSC 310 receiving SMDPP data transmits the data to the GPS phone 150 in the form of a data burst (DATA BURST [Bearer]) (S112), and transmits the burst data in the process (S112). The GPS phone 150 receives the GPS satellite signal quickly and transmits it to the MSC 310 in the form of a data burst (DATA BURST [Bearer]) (S114). At this time, the GPS phone 150 uses 'Provide Pseudorange Measurement' and 'Provide Pilot Phase Measurement', which are message standards for data transmission defined in the IS-801 message. Then, the MSC 310 transmits the GPS satellite signal measurement result to the PDE server 400 in the form of SMDPP (S116).

The PDE server 400 receiving the GPS satellite signal measurement result through the processes S108 to S116 calculates the position of the GPS phone 150 using the GPS satellite signal measurement result (S118). It is configured as a response message (GPOSRSP) for the location request and transmitted to the telematics server 200 via the MPC (320) (S119, S120).

The telematics server 200 calculates a route from the current location to the destination by using the destination information received from the telematics kit 110 and the current location calculation result of the GPS phone 150 received from the PDE server 400. (S122), and delivers it to the telematics kit 110 via the GPS phone 150 (S124. S126).

The telematics kit 110 receiving the route information provides a route guidance service to the user by using the received route information (S128).

As illustrated in FIG. 4, the path information may be generated only once for the first time by using the current location determined by the PDE server 400. Therefore, after the current position is determined for the first time, the current position of the terminal is determined by the method illustrated in FIG. 5 rather than the method illustrated in FIG. 4, and a path based on the current position is calculated.

5 is a flowchart of a process of calculating a position of a telematics system according to an exemplary embodiment. Referring to FIG. 5, after determining a current location of a terminal through a process as illustrated in FIG. 4 and guiding a path based on the current location, a predetermined reason (for example, a map-matching error, If the route guidance service cannot be provided due to the route departure, the user should request the route guidance service to the telematics server 200 again.

In this case, the telematics kit 110 determines the current location of the user using the GPS receiver 111 mounted on the telematics kit 110 (S202). This is because the telematics kit 110 already knows the range of GPS satellites to be searched for when the telematics kit 110 first determines the location. That is, since the telematics kit 110 already knows the range of GPS satellites to be searched, it is possible to determine the current position in a short time without using AGPS information.

The telematics kit 110 determining the current location in step S202 transmits the current location and destination information input by the user to the telematics server 200 via the GPS phone 150 (S204 and S206).

The telematics server 200 that has received the current location and destination information calculates an optimal route from the current location to the destination using the current location and destination information (S208) and passes the route information through the GPS phone 150. Transfer to the telematics server 110 (S210, S212).

According to the above embodiment, when the telematics kit 110 receives the route information from the telematics server 200 for the first time and provides a route guidance service, the telematics kit 110 may include a GPS receiver mounted on the telematics kit 110 (FIG. 3). '111') to measure the user's current location. However, the GPS receiver ('111' of FIG. 3) on the telematics kit 110 may not be driven yet, and thus an initial position may not be measured through GPS. In this case, the current position information may be the following two cases. Get

First, the telematics kit 110 again uses the procedure for requesting a route service for the first time. That is, an initial position is measured by performing a processing procedure as illustrated in FIG. 4.

Second, the telematics kit 110 switches to a mode for measuring a current position through an internal sensor (eg, a GPS sensor and an inertial sensor), and then measures the current position of the user using the sensor data measured by the sensor. .

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

As described above, the present invention reduces the initial position measurement time of the terminal required for the telematics service by applying the AGPS concept to the telematics system. Therefore, there is an advantage that a quick service is possible. In addition, by increasing the GPS signal reception sensitivity in the urban area where the GPS signal is weak, there is an advantage that can minimize the GPS shadow area and enable accurate user location measurement.

In addition, the present invention transmits / receives AGPS information without adding an additional chip for performing AGPS function to a terminal of a telematics system by using a protocol (IS-801) according to a standard standard between a PDE server and a GPS phone. There is another advantage to enable this. Therefore, there is an effect that can greatly reduce the time and financial problems in implementing the AGPS function.

Claims (8)

In telematics systems, Collects, stores, and manages the GPS information including the orbit information and the correction information of the GPS satellite, and uses the GPS signal transmitted through the mobile communication network in connection with the mobile communication network. A positioning server for calculating the current position of the moving object, A telematics server that receives a current position of a moving object from the positioning server in response to a telematics service request and generates telematics service information data based on the current position information of the moving object; A telematics kit for receiving a user's telematics service request information and providing a user with a service suitable for a current position of a mobile object by using the telematics service information data generated by the telematics server; Data is transmitted / received through the positioning server and the mobile communication network, and the GPS signal is quickly received by using the GPS information transmitted from the positioning server, and then the GPS signal is received. G.P.S phone which transmits to the positioning server, transmits the telematics service request information of the telematics kit to the telematics server, and transmits the telematics service information data generated by the telematics server to the telematics kit. A telematics system with an A.P.S. function. The method of claim 1, wherein the telematics kit A GPS receiver that receives GPS satellite signals and measures position data; And a processing unit for receiving the telematics service information data generated by the telematics server through the GPS phone and providing the telematics service to the user using the telematics service information data. .Telematics system with S function. The method of claim 2, wherein the processing unit A. When the current position of the moving object to be measured again while providing the location-based service A. characterized in that for measuring the current position using the GPS satellite signal received from the GPS receiver. Telematics system with GPS function. The method of claim 3, wherein the telematics kit A first sensor for measuring the position coordinates and time data of the moving object and a second sensor for measuring the moving direction and the moving speed of the moving object further comprising the current position of the moving object using the sensor data measured by the first and second sensors Telematics system with AG PS function characterized by measuring. The method of claim 1, wherein the G.S. And a mobile communication module for transmitting / receiving telematics service information between the telematics kit and the telematics server. According to claim 1, wherein the positioning server When the current location information of the GPS phone is requested from the telematics server, information necessary for the location measurement of the GPS phone is transmitted to the GPS phone through a mobile communication network, and the GPS service is transmitted. After receiving the location information of the GPS phone from the mobile phone via the mobile communication network to determine the current location of the GPS phone, and sends the current location of the GPS phone to the telematics server A telematics system having an Ag. The method of claim 6, wherein the positioning server A telematics system having an A.P.S. function, characterized in that the communication using the protocol (IS-801) according to the standard of the G.P.S. and the mobile communication network. The method of claim 6, wherein the positioning server A plurality of lower location servers managed by one higher location server, the higher location server analyzes the request of the telematics server and then selects a lower location server suitable for the request and the higher location server selects the selected lower location server. A telematics system having an A.P.S function, which requests a positioning server to request a current location of a P.S.P.

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