KR20100128978A - Apparatus for measuring distance between vehicles having the navigation system equipped with gps receiver and bluetooth communication module - Google Patents

Abstract

PURPOSE: A distance measuring device is provided to uniformly maintain the distance between vehicles by measuring the distance in a front or a rear side by using a Bluetooth protocol while driving. CONSTITUTION: A GPS receiving part(101,201) calculates the location information of the terminal at the current time in a real time. A host processing part(102,202) maps the location information of the terminal at the current time to a map. An LCD display part(103,203) indicate the location information of the terminal at the current time on the map. A bluetooth communications part(104,204) forms a Piconet with the Bluetooth communications part in the navigation system into a master/slave method. An alarm generating part(106,206) determines whether the distance between a one's vehicle and a front or rear vehicle from the his or her vehicle is greater than safety distance.

Description

Apparatus for measuring distance between vehicles having the navigation system equipped with GPS receiver and bluetooth communication module}

The present invention relates to an inter-vehicle distance measuring apparatus, and in particular, after a vehicle having a navigation system equipped with a Bluetooth communication module and a GPS receiver requests driving position information of a front and rear vehicle through a Bluetooth communication module, Equipped with a Bluetooth communication module and a GPS receiver for receiving the position information of the vehicle at the current time received by the GPS receiver and the length information from the GPS receiver and the bumper of the requested vehicle to measure the distance of the front and rear vehicle by the navigation software. It relates to an inter-vehicle distance measuring device of a navigation system.

The Global Positioning System (GPS) has been developed for military purposes since 1973 by the US Air Force, and has been developed for a map system that can be applied to any part of the world. In 1978, funded by the DoD, the first GPS satellite called NAVSTAR (NAVigation System with Timing And Ranging) was launched, and by 1985 a total of 11 first-generation experimental satellites (Block I) were launched. Since 1989, the second generation of satellites (Block II) has been launched, and since 1995, a total of 24 second-generation GPS satellites have been around the earth, and four or more satellites can be seen anywhere in the world. More than five GPS satellites are always passing over the country.

In response to the US GPS, Russia established GLONASS, and the European Union launched a new satellite navigation system, Galileo, to provide improved satellite navigation and positioning services to protect its sovereignty and contain the US solo in the global satellite navigation market. Providing.

GPS is a global radio navigation system using GPS satellites developed by the US Department of Defense. It calculates the position, speed and time of a GPS receiver by providing the positions and speeds of three to four GPS satellites. GPS uses common coordinates worldwide by the World Geodetic System (WGS-84), the Standard Positioning System (SPS) serviced by the private sector, and the Precise Positioning Service (PPS) used by the military sector. System).

The GPS receiver is a system that provides location, speed, and time measurement services using satellites. The GPS receiver consists of the satellite, ground control, and user sectors.

The satellite segment consists of 24 GPS satellites, each of which is equipped with two cesium atomic clocks and a rubidium clock to maintain precise time, and each satellite has a unique code called a PRN (Pseudo Random Noise) code. This code can be used to distinguish satellites. There are a total of 24 satellites, with 21 operating satellites and three reserve satellites orbiting the earth at 12-hour orbital cycles. The satellite's antenna is the Herix Array, whose largest gain is 15dB and is circularly polarized to the right. GPS satellites have an elliptical orbit that is close to a circle with an orbital eccentricity of less than 0.03 degrees at an altitude of about 20,183 km, and the orbital inclination angle is 55 degrees. In addition, four are assigned to six track surfaces distributed at equal intervals on the equator, and the total is 24. The orbital cycle of the GPS satellites orbiting the earth orbits the planet twice a day at exactly 11 hours and 58 minutes. The GPS terminal is arranged to receive signals from at least five satellites. Each satellite transmits two L-band frequencies, L1 (1,575.42 MHz) and L2 (1,227.6 MHz), where L1 carries a Precise Code and a C / A Code (Coarse / Acquisition), and L2 Return the P code. Navigation data is superimposed on these codes and conveyed by L1 and L2.

The ground control sector consists of a system of tracking and transmitting stations located around the world. The ground control sector consists of three main control stations (MCS), unmanned subsidiary control stations (MS) and up-link ground antennas (GA). The state controller manages and controls the entire system of GPS and is located at Felcon Air Force Base in Colorado Springs, USA. The state control station receives data from the secondary control station, performs all the processing and calculations necessary to keep the satellite in orbit, and generates a navigation message including the orbit of each satellite. Communication between the primary and secondary control stations and terrestrial transmitting stations is done using satellites other than GPS. The Deputy Authority consists of five globally distributed GPS monitoring stations, which track all GPS satellites over orbit and measure both the distance to the satellite and the rate of change of the distance. The mission of the three terrestrial transmitting stations is to communicate with the satellite in S-band (up-link 1783.74 MHz, down-link 2227.5 MHz) to receive data on the operational status of the satellite, and to control the satellites from the signals and the main control station. Sends a new navigation message to the satellite.

The user segment consists of a GPS antenna, a GPS receiver and data processing software, and receives signals from the GPS satellites as an antenna so that the current position, speed and time of the GPS terminal can be known. When observing with two or more receivers at the same time, the relative distance between the two antennas and the azimuth and elevation angles of the baseline, as well as the three-dimensional components of the distance difference can be precisely measured. In order to calculate the position, speed and time of a GPS receiver, four or more satellites must be observed at the same time. In principle, the three-dimensional coordinates (X, Y, Z) of the observation point obtained by receiving radio waves from three satellites and The time T is combined to determine four-dimensional coordinates.

The positioning principle of GPS uses the principle of triangulation. In a typical triangulation, the position of an unknown point is determined by measuring the size of two angles except the point and the length of the side between them. The difference from triangulation is that determining the location of an unknown point by measuring the length of two sides in between. The distance from the satellite to the GPS receiver is measured by the time difference between the time of occurrence and the time of reception of the code signal generated by each satellite in the time of arrival (ToA) method, and then the speed of light (C = 3x10 ⁸ m / sec) Multiply by speed x elapsed time). In order to determine the current position of the GPS receiver based on the position of the satellite, ephemeris data is provided in addition to the distance data.

Location server and location data server using location based service (LBS) using a navigation system using GPS or a CELL-ID of a base station of a mobile communication network. , Y coordinate) to display location information and traffic information on a map from a point of interest (POI) starting point at the current location.

Navigation system is a vehicle-mounted, PDA-type, cellular-type, DMB-type satellite navigation system that measures current location information from GPS antennas and GPS receivers, maps it on a map, and distances and traffic from the current location to the destination. It is a system that guides you along the optimal path chosen based on the situation.

The GPS navigation system for cars has a GPS receiver antenna and a GPS receiver in navigation devices such as PDAs and phones, and an LBS service (real-time traffic information) that maps digital maps to CD-ROM, DVD-ROM, and measured location information on a map. It is equipped with navigation software that provides map guidance (POI search) and route guidance.

However, while the vehicle is being driven, the location information of the current terminal is displayed on a map using a navigation system equipped with a GPS receiver. However, this information is used to determine the distance from the front or rear vehicle unlike the conventional infrared or laser method. There was a problem that could not be measured.

The present invention has been proposed to solve the problems of the prior art, after a vehicle having a navigation system equipped with a Bluetooth communication module and a GPS receiver, while driving, after requesting the position information of the front or rear vehicle using the Bluetooth communication protocol, Bluetooth communication for receiving the position information of the vehicle at the current time received by the GPS receiver of the front or rear vehicle and the length information from the GPS receiver of the requested vehicle to the vehicle bumper to measure the distance of the front or rear vehicle by the navigation software. An object of the present invention is to provide an inter-vehicle distance measuring device of a navigation system equipped with a module and a GPS receiver.

In order to achieve the object of the present invention, an inter-vehicle distance measuring device of a navigation system equipped with a Bluetooth communication module and a GPS receiver according to the present invention, receiving a code signal from a plurality of GPS satellites via a GPS antenna in real time A GPS receiver for calculating position information of a terminal of the GPS receiver; Connected to the GPS receiver, and maps the location information of the terminal of the current time from the GPS receiver on the map, provides the distance to the destination and real-time local traffic information from the current location to the point of interest (POI) starting point, A host processor guiding along an optimal path and controlling a navigation function for calculating a distance to the front and rear vehicles; It is connected to the host processor, and stores the navigation software, the map data, the location information of the terminal of the current time, the position-related information of the front and rear vehicles, and the alarm sound data generated when approaching within a safety distance between the vehicle and the front and rear vehicles. Memory; An LCD display unit connected to the host processor and configured to display location information of a terminal of a current time of a vehicle on a map and display distances D of front and rear vehicles; After forming a piconet in a master / slave manner with a Bluetooth communication unit of a navigation system equipped with a GPS receiver of a front or rear vehicle using a Bluetooth communication protocol, requesting location information of the rear vehicle, and in response thereto, A Bluetooth communication unit for receiving the position information of the current time of the front or rear vehicle and the length information D1 from the GPS receiver of the requested vehicle to the vehicle bumper from the Bluetooth communication unit of the navigation system equipped with the GPS receiver of the front or rear vehicle; And an alarm generator configured to determine whether the safety distance between the user's vehicle and the front or rear vehicle is greater than 1m and to generate a safety distance exceeded alarm sound using voice data previously stored in the memory when approaching within the safety distance.

The navigation software is a vehicle having a navigation system equipped with a Bluetooth communication module and a GPS receiver. The vehicle receives the position information of the vehicle at the current time and the length information from the GPS receiver of the vehicle to the bumper of the vehicle, and calculates the distance D2 from the GPS receiver of the vehicle to the front bumper of the vehicle. It is characterized by measuring the distance.

As described above, the vehicle-to-vehicle distance measuring apparatus of the navigation system equipped with the Bluetooth communication module and the GPS receiver according to the present invention uses a navigation system while the vehicle equipped with the Bluetooth communication module and the GPS receiver is running. After requesting the location information of the front or rear vehicle using the protocol, the navigation software receives the location information of the vehicle at the current time received by the GPS receiver of the front or rear vehicle and the length information from the GPS receiver of the requested vehicle to the vehicle bumper. There is an effect of measuring the distance of the front or rear vehicle by.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a navigation device equipped with a Bluetooth communication unit and a GPS receiver according to the present invention.

A navigation device equipped with a Bluetooth communication module and a GPS receiver includes a GPS receiver 101, 201, a host processor 102, 202, an LCD display 103, 203, a Bluetooth communication unit 104, 204, a memory 105, 205, and an alarm generator 106, 206, respectively. Include.

The GPS receivers 101 and 201 receive a code signal from three to four GPS satellites via a GPS antenna, convert the code signal into an intermediate frequency (IF) through an RF front end, and then convert the GPS signal into an A / D conversion and correlator. Through calculate the speed, location information of the terminal at the current time in real time. GPS antennas use orthogonal dipoles or nautical antennas, aircraft or automobiles use microstrip antennas, and small antennas currently use ceramic antennas, and low noise amplifiers (LNAs) to compensate for attenuation of received GPS signals and to reduce noise. ).

The host processors 102 and 202 are connected to the GPS receivers 101 and 201, and map the location information of the terminal at the current time from the GPS receivers 101 and 201 on a map, and the destination from the current position to a point of interest (POI) origin. It provides the distance to and real-time local traffic information, guides you along the optimal route you choose, and provides navigation control to calculate the distance to the front and rear vehicles.

The memory 105 and 205 are connected to the host processors 102 and 202, and when the navigation software, the map data, the location information of the terminal at the current time and the location related information of the front and rear vehicles, and the safe distance between the own vehicle and the front and rear vehicles are approached. Save alarm sound data.

The Bluetooth communication unit 104, 204 uses a Bluetooth communication protocol using a 2.4 GHz ISM band within 100 meters and uses a Bluetooth communication unit and a master / slave point-to-point method of a Bluetooth communication unit of a navigation system equipped with a GPS receiver of a front or rear vehicle. (Piconet), after requesting the position information of the front or rear vehicle, in response to the position of the current time of the front or rear vehicle from the Bluetooth communication unit of the navigation system equipped with the GPS receiver of the front or rear vehicle Information and length information D1 is received from the GPS receiver of the requested vehicle to the vehicle bumper.

In-vehicle GPS navigation system includes GPS receiver antenna and GPS receiver in navigation devices such as PDA and Phone, digital maps on CD-ROM, DVD-ROM, and current location information on the GIS map. Displays coordinates (X, Y coordinates) and maps them on the map from the point of interest (POI) starting point at the current location, and LBS (Location Based Service) services such as real-time traffic information, map guidance (POI search), route guidance To provide.

2 is a block diagram of a distance measurement system between vehicles of a navigation device equipped with a Bluetooth communication unit and a GPS receiver according to an embodiment of the present invention.

The navigation software is a Bluetooth communication unit of the navigation system of the front or rear vehicle 100 using the Bluetooth communication protocol while the vehicle 200 having the navigation system equipped with the Bluetooth communication unit 204 and the GPS receiver 201 is running. After requesting the location information, and receiving the position information of the vehicle of the current time received from the Bluetooth communication unit of the front or rear vehicle navigation system and the length information (D1) from the GPS receiver of the requested vehicle to the vehicle bumper, The distance D2 from the GPS receiver of the own vehicle to the front bumper is calculated, and the distance D of the front or rear vehicle is measured as in Equation 1 below.

The LCD display units 103 and 203 are connected to the host processors 102 and 202, and display location information of the terminal at the current time of the vehicle on the map and display distances of the front and rear vehicles.

The alarm generators 106 and 206 determine whether the safety distance between the user's vehicle and the front or rear vehicle exceed the safety distance (1 m), and generate a safety distance exceeded alarm sound using voice data previously stored in the memory 205 when approaching within the safety distance. .

3 is a flowchart illustrating a method for measuring a distance between vehicles of a navigation system equipped with a Bluetooth communication unit and a GPS receiver according to an embodiment of the present invention.

The navigation system equipped with the Bluetooth communication unit and the GPS receiver receives position information (X, Y, Z coordinates) of the vehicle at the current time T by the GPS receiver of the vehicle (step S10).

The navigation device equipped with the Bluetooth communication unit and the GPS receiver receives the location information of the terminal at the current time through the GPS antenna, and when the vehicle is automatically or manually selected as the distance measuring mode with the front or rear vehicle, the navigation device's Bluetooth The communication unit acts as a master, and the Bluetooth communication unit of a front or rear vehicle navigation system acts as a slave to perform a short-range wireless communication in the form of an ad-hoc network in a point-to-point manner. (100 m or less) to establish a connection by synchronizing the frequency hops of the master and slave using the Bluetooth communication protocol to form a piconet (step S11).

The own vehicle 200 having the navigation system equipped with the Bluetooth communication unit 204 and the GPS receiver 201 serving as a master, while driving, uses the Bluetooth communication protocol and the Bluetooth communication unit 104 of the front or rear vehicle 100. And requesting the position information of the current time to the navigation system equipped with the GPS receiver 101 (step S12), the position information of the vehicle at the current time received by the GPS receiver 101 of the front or rear vehicle and the request of the vehicle. Receives the length information D1 from the GPS receiver to the vehicle bumper, calculates the distance D2 from the GPS receiver of the vehicle of the vehicle owned by the navigation software to the front bumper, and calculates the distance D of the front or rear vehicle. The measurement is made and output to the LCD display unit 203 (step S13). In the same way, the distance between one's own vehicle with a navigation system equipped with a Bluetooth communication module and a GPS receiver and the next vehicle also forms a piconet using the Bluetooth communication protocol. The distance can be measured by receiving and receiving terminal location information.

In addition, the navigation system equipped with a Bluetooth communication module and a GPS receiver measures the distance between the front or rear vehicle, and then determines whether the safety distance (1 m) between the bumper of the vehicle and the bumper of the front / rear vehicle is exceeded. When approaching within a preset safety distance, an alarm sound is generated with voice data previously stored in the memory 205 (step S14).

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, flash memory, hard disk, magneto-optical disk, etc.) in a form readable using a navigation device. have.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art without departing from the spirit and scope of the present invention described in the claims In the present invention can be carried out by various modifications or variations.

1 is a block diagram of a navigation device equipped with a Bluetooth communication unit and a GPS receiver according to the present invention.

2 is a block diagram of a distance measurement system between vehicles of a navigation device equipped with a Bluetooth communication unit and a GPS receiver according to an embodiment of the present invention.

3 is a flowchart illustrating a method for measuring a distance between vehicles of a navigation system equipped with a Bluetooth communication unit and a GPS receiver according to an embodiment of the present invention.

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

ANT: GPS antenna 101,201: GPS receiver

102, 202: host processor 103, 203: LCD display unit

104,204: Bluetooth communication unit 105,205: memory

106,206: Alarm generator

Claims (2)

In a vehicle-to-vehicle distance measuring device of a navigation system equipped with a Bluetooth communication module and a GPS receiver, A GPS receiver for receiving code signals from a plurality of GPS satellites via a GPS antenna and calculating location information of a terminal at a current time in real time; Connected to the GPS receiver, and maps the location information of the terminal of the current time from the GPS receiver on the map, provides the distance to the destination and real-time local traffic information from the current location to the point of interest (POI) starting point, A host processor guiding along an optimal path and controlling a navigation function for calculating a distance to the front and rear vehicles; It is connected to the host processor, and stores the navigation software, map data, the location information of the terminal of the current time, the position-related information of the front and rear vehicles, and the alarm sound data generated when approaching within a safety distance between the vehicle and the front and rear vehicles. Memory; An LCD display unit connected to the host processor and configured to display location information of a terminal of a current time of a vehicle on a map and display distances D of front and rear vehicles; After forming a piconet in a master / slave manner with a Bluetooth communication unit of a navigation system equipped with a GPS receiver of a front or rear vehicle using a Bluetooth communication protocol, requesting location information of the rear vehicle, and in response thereto, A Bluetooth communication unit for receiving the position information of the current time of the front or rear vehicle and the length information D1 from the GPS receiver of the requested vehicle to the vehicle bumper from the Bluetooth communication unit of the navigation system equipped with the GPS receiver of the front or rear vehicle; And An alarm generator configured to determine whether the safety distance between the user's vehicle and the front or rear vehicle is greater than 1m and to generate an alarm sound when the safety distance is exceeded within the safety distance with voice data previously stored in the memory; Inter-vehicle distance measuring device of the navigation system equipped with a Bluetooth communication module and GPS receiver including a. The method of claim 1, wherein the navigation software, The vehicle having the navigation system equipped with the Bluetooth communication unit and the GPS receiver, while driving, requests the position information of the front or rear vehicle using the Bluetooth communication protocol, and then the position of the vehicle at the current time received by the Bluetooth communication unit of the front or rear vehicle. Receiving the information and the length information from the GPS receiver of the requested vehicle to the bumper of the vehicle, and calculating the distance D2 from the GPS receiver of the own vehicle to the front bumper to measure the distance of the front or rear vehicle. An inter-vehicle distance measuring device for a navigation system equipped with a Bluetooth communication module and a GPS receiver.

Images